/* ============================================
   IB SCIENCE QBANK — Premium Dark-First Design
   Inspired by units.gr design language:
   Bold typography, dense layouts, chunky buttons,
   solid colors, generous radii
   ============================================ */

/* ─── Fonts ─── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;0,9..40,800;0,9..40,900;1,9..40,400&display=swap');

:root {
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.18);
    --transition-speed: 0.2s;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 999px;

    --color-success: #22C55E;
    --color-warning: #F59E0B;
    --color-error: #EF4444;

    /* Fluid typography */
    --text-xs: clamp(0.65rem, 0.6rem + 0.25vw, 0.75rem);
    --text-sm: clamp(0.75rem, 0.7rem + 0.25vw, 0.85rem);
    --text-base: clamp(0.82rem, 0.78rem + 0.2vw, 0.92rem);
    --text-lg: clamp(0.95rem, 0.9rem + 0.25vw, 1.1rem);
    --text-xl: clamp(1.15rem, 1rem + 0.5vw, 1.4rem);
    --text-2xl: clamp(1.4rem, 1.2rem + 0.8vw, 1.85rem);
    --text-3xl: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
}

/* ─── Dark Theme (Default) ─── */
[data-theme="dark"] {
    --bg-main: #000000;
    --bg-sidebar: #121212;
    --bg-card: #1E1E1E;
    --bg-elevated: #28282B;

    --text-primary: #FAFAFA;
    --text-secondary: #D4D4D8;
    --text-muted: #71717A;

    --border-light: #1F1F22;
    --border: #2E2E33;

    --modal-overlay: rgba(0, 0, 0, 0.85);
    --modal-bg: #121212;
    --input-bg: #000000;

    --btn-hover: #1E1E1E;
    --pdf-bg: #121212;
}

/* ─── Subject Accent Colors ─── */
[data-color="physics"] {
    --accent: #3B82F6;
    --accent-light: rgba(59, 130, 246, 0.14);
    --accent-hover: #2563EB;
    --accent-glow: rgba(59, 130, 246, 0.25);
    --accent-solid: #3B82F6;
}
[data-color="chemistry"] {
    --accent: #22C55E;
    --accent-light: rgba(34, 197, 94, 0.14);
    --accent-hover: #16A34A;
    --accent-glow: rgba(34, 197, 94, 0.25);
    --accent-solid: #22C55E;
}

[data-color="indigo"] { --accent: #6366F1; --accent-light: rgba(99, 102, 241, 0.14); --accent-hover: #4F46E5; --accent-glow: rgba(99, 102, 241, 0.25); --accent-solid: #6366F1; }
[data-color="blue"] { --accent: #3B82F6; --accent-light: rgba(59, 130, 246, 0.14); --accent-hover: #2563EB; --accent-glow: rgba(59, 130, 246, 0.25); --accent-solid: #3B82F6; }
[data-color="green"] { --accent: #22C55E; --accent-light: rgba(34, 197, 94, 0.14); --accent-hover: #16A34A; --accent-glow: rgba(34, 197, 94, 0.25); --accent-solid: #22C55E; }
[data-color="orange"] { --accent: #F59E0B; --accent-light: rgba(245, 158, 11, 0.14); --accent-hover: #D97706; --accent-glow: rgba(245, 158, 11, 0.25); --accent-solid: #F59E0B; }
[data-color="rose"] { --accent: #F43F5E; --accent-light: rgba(244, 63, 94, 0.14); --accent-hover: #E11D48; --accent-glow: rgba(244, 63, 94, 0.25); --accent-solid: #F43F5E; }

/* Cosmetic Purchased Theme Overrides */
[data-theme-accent="retro"] {
    --accent: #22C55E !important;
    --accent-hover: #16A34A !important;
    --accent-light: rgba(34, 197, 94, 0.12) !important;
    --accent-glow: rgba(34, 197, 94, 0.25) !important;
    --accent-solid: #22C55E !important;
}
[data-theme-accent="cyberpunk"] {
    --accent: #EC4899 !important;
    --accent-hover: #DB2777 !important;
    --accent-light: rgba(236, 72, 153, 0.12) !important;
    --accent-glow: rgba(236, 72, 153, 0.25) !important;
    --accent-solid: #EC4899 !important;
}
[data-theme-accent="nordic"] {
    --accent: #06B6D4 !important;
    --accent-hover: #0891B2 !important;
    --accent-light: rgba(6, 182, 212, 0.12) !important;
    --accent-glow: rgba(6, 182, 212, 0.25) !important;
    --accent-solid: #06B6D4 !important;
}
[data-theme-accent="gold"] {
    --accent: #D97706 !important;
    --accent-hover: #B45309 !important;
    --accent-light: rgba(217, 119, 6, 0.12) !important;
    --accent-glow: rgba(217, 119, 6, 0.25) !important;
    --accent-solid: #D97706 !important;
}


/* ─── Reset ─── */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.45;
    overflow: hidden;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: var(--text-base);
}

.app-container { display: flex; height: 100vh; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Animations ─── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* =============================================
   SIDEBAR
   ============================================= */
.sidebar {
    width: 270px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    padding: 0;
    flex-shrink: 0;
    z-index: 10;
    transition: background-color var(--transition-speed) ease;
}

.sidebar-header { padding: 0 1rem 0.75rem; }

.logo-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
}

.logo h1 {
    font-size: var(--text-lg);
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    white-space: nowrap;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.45rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}
.icon-btn:hover { background: var(--btn-hover); color: var(--text-primary); }

/* ─── Switchers ─── */
.mode-switcher {
    display: flex;
    margin: 0 0.75rem 0.6rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-pill);
    padding: 3px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    gap: 2px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.mode-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.55rem 0.2rem;
    font-size: 0.7rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.45);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mode-btn:hover { color: rgba(255, 255, 255, 0.85); }
.mode-btn.active {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}

/* ─── Search ─── */
.search-container {
    position: relative;
    margin: 0 0.75rem 0.75rem;
}
.search-container input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-pill);
    padding: 0.55rem 1rem 0.55rem 2.1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--text-sm);
    outline: none;
    transition: all 0.2s ease;
}
.search-container input::placeholder { color: var(--text-muted); }
.search-container input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}
.search-icon {
    position: absolute;
    left: 0.7rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* ─── Nav Menu ─── */
.nav-menu {
    flex: 1;
    overflow-y: auto;
    padding: 0 0.5rem;
}
.nav-group { margin-bottom: 1rem; }

.nav-group-title {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
    padding-left: 0.7rem;
    font-weight: 800;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-right: 0.7rem;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.7rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 600;
    transition: all 0.15s ease;
    cursor: pointer;
    margin-bottom: 1px;
    user-select: none;
    border-left: 3px solid transparent;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.nav-count {
    font-size: var(--text-xs);
    font-weight: 700;
    background: var(--bg-elevated);
    color: var(--text-muted);
    padding: 0.1rem 0.4rem;
    border-radius: var(--radius-pill);
    min-width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.nav-item:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 700;
    border-left-color: var(--accent);
}

/* =============================================
   MAIN CONTENT
   ============================================= */
.content-area {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-main);
}

.list-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: flex 0.25s ease;
    min-width: 280px;
}
.content-area.viewing-pdf .list-pane {
    flex: 0 0 360px;
    border-right: none;
    background: var(--bg-sidebar);
}

/* ─── Content Header ─── */
.content-header {
    padding: 1.75rem 2rem 1rem;
    background: var(--bg-main);
    z-index: 5;
    transition: background-color var(--transition-speed) ease;
    flex-shrink: 0;
}
.content-area.viewing-pdf .content-header {
    background: var(--bg-sidebar);
    padding: 1rem 1.25rem;
}
.content-header h2 {
    font-size: var(--text-2xl);
    font-weight: 900;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.content-area.viewing-pdf .header-title-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    width: 100%;
}
.content-area.viewing-pdf .header-right {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.content-area.viewing-pdf .content-header h2 {
    font-size: var(--text-lg);
    line-height: 1.2;
}
.stats {
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 600;
}
.header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.header-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

/* ─── Paper Filter ─── */
.paper-filter {
    display: flex;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-pill);
    overflow: hidden;
    padding: 2px;
    gap: 2px;
}
.paper-filter.hidden { display: none; }

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 0.4rem 0.65rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.filter-btn:hover { color: var(--text-primary); background: var(--btn-hover); }
.filter-btn.active { background: var(--accent); color: #fff; }

/* ─── Papers Grid ─── */
.papers-grid {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 2rem 1.5rem;
}
.content-area.viewing-pdf .papers-grid {
    padding: 0 1rem 1rem;
}

/* ─── Subtopic Section ─── */
.subtopic-section { margin-bottom: 1.75rem; }

.subtopic-title {
    font-size: var(--text-base);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--border-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.6rem;
}
.content-area.viewing-pdf .cards-grid {
    grid-template-columns: 1fr;
}

/* ─── PDF Cards ─── */
.pdf-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.75rem 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
}
.pdf-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    border-color: var(--accent);
    background: var(--bg-elevated);
}
.pdf-card.active-paper {
    border-color: var(--accent);
    background: var(--accent-light);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.pdf-card.boss-card {
    border: 2px solid var(--accent);
    background: linear-gradient(135deg, var(--bg-card) 60%, var(--accent-light) 100%);
    box-shadow: 0 4px 12px var(--accent-glow);
}
.pdf-card.boss-card:hover {
    box-shadow: 0 6px 20px var(--accent-glow);
    transform: translateY(-2px);
}
.boss-crown {
    font-size: 1.25rem;
    background: var(--accent-light);
    padding: 0.3rem 0.45rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s infinite;
}

.pdf-icon {
    color: var(--accent);
    background: var(--accent-light);
    padding: 0.45rem;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.pdf-info { overflow: hidden; min-width: 0; flex: 1; }
.pdf-name {
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 700;
    margin-bottom: 0.05rem;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.pdf-meta {
    color: var(--text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ─── Empty State ─── */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 50vh;
    color: var(--text-muted);
    text-align: center;
    animation: fadeIn 0.4s ease;
}
.empty-state svg { margin-bottom: 0.75rem; color: var(--border); }
.empty-state h3 { color: var(--text-secondary); font-size: var(--text-lg); font-weight: 700; }
.empty-state p { color: var(--text-muted); font-size: var(--text-sm); margin-top: 0.2rem; }

/* =============================================
   RESIZE HANDLE
   ============================================= */
.resize-handle {
    width: 0;
    cursor: col-resize;
    background: transparent;
    display: none;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    z-index: 15;
}
.content-area.viewing-pdf .resize-handle {
    display: flex;
    width: 5px;
    background: var(--border-light);
}
.resize-grip {
    width: 3px;
    height: 28px;
    border-radius: 3px;
    background: var(--text-muted);
    opacity: 0;
    transition: opacity 0.15s ease;
}
.resize-handle:hover .resize-grip,
.resize-handle.dragging .resize-grip { opacity: 0.5; }
.resize-handle:hover,
.resize-handle.dragging { background: var(--accent-light); }

/* =============================================
   PDF VIEWER PANE
   ============================================= */
.viewer-pane {
    flex: 0;
    display: flex;
    flex-direction: column;
    background: var(--pdf-bg);
    opacity: 0;
    visibility: hidden;
    width: 0;
    transition: opacity 0.2s ease;
    overflow: hidden;
}
.content-area.viewing-pdf .viewer-pane {
    flex: 1;
    opacity: 1;
    visibility: visible;
    width: auto;
}
.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-light);
    z-index: 2;
    flex-shrink: 0;
}
.viewer-header h3 {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 0.75rem;
    min-width: 0;
}
.viewer-toolbar {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-shrink: 0;
}
.toolbar-divider {
    width: 1px;
    height: 16px;
    background: var(--border-light);
    margin: 0 0.15rem;
}
.tool-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.35rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}
.tool-btn:hover { background: var(--btn-hover); color: var(--text-primary); }
.tool-btn.active { background: var(--accent-light); color: var(--accent); }
.tool-btn.danger-text { color: var(--color-error); }
[data-theme="dark"] .tool-btn.danger-text:hover { background: rgba(239, 68, 68, 0.12); }

.toolbar-text {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-primary);
    min-width: 36px;
    text-align: center;
}

/* ─── Markscheme Toggle ─── */
.ms-toggle-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: var(--text-xs);
    padding: 0.4rem 0.7rem;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: inherit;
    white-space: nowrap;
}
.ms-toggle-btn:hover { background: var(--btn-hover); color: var(--text-primary); }
.ms-toggle-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.ms-toggle-btn.hidden { display: none; }

/* ─── Close Button ─── */
.close-btn {
    background: var(--bg-elevated);
    border: 1px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.35rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}
.close-btn:hover { background: var(--btn-hover); color: var(--text-primary); }

/* ─── PDF Container ─── */
.pdf-container {
    flex: 1;
    width: 100%;
    height: 100%;
    background: var(--pdf-bg);
    overflow: auto;
    position: relative;
    padding: 1.25rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}
.pdf-page-wrapper {
    position: relative;
    box-shadow: var(--shadow-lg);
    background: white;
    flex-shrink: 0;
}
.pdf-render-layer, .pdf-annotation-layer { position: absolute; top: 0; left: 0; }
.pdf-render-layer { z-index: 1; }
.pdf-annotation-layer { z-index: 2; cursor: url("data:image/svg+xml;base64,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") 12 12, crosshair; }
.pdf-annotation-layer.cursor-pan { cursor: grab; }
.pdf-annotation-layer.cursor-pan:active { cursor: grabbing; }
.pdf-annotation-layer.cursor-text { cursor: text; }

.text-annotation {
    position: absolute;
    z-index: 3;
    font-family: 'DM Sans', sans-serif;
    font-size: 16px;
    color: #F43F5E;
    min-width: 50px;
    min-height: 20px;
    outline: none;
    cursor: text;
    white-space: pre-wrap;
    background: transparent;
    border: 1px dashed transparent;
}
.text-annotation:focus {
    border-color: var(--accent);
    background: rgba(255,255,255,0.5);
}

/* =============================================
   EXAM TIMER
   ============================================= */
.exam-timer {
    position: fixed;
    bottom: 1.25rem;
    right: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 0.55rem 1rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.65rem;
    z-index: 50;
    animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.exam-timer.hidden { display: none; }
.exam-timer.danger .timer-display { color: var(--color-error); animation: pulse 1s infinite; }

.timer-display {
    font-size: var(--text-lg);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
}
.timer-controls { display: flex; gap: 0.2rem; }

/* =============================================
   SETTINGS MODAL
   ============================================= */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--modal-overlay);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.15s ease;
}
.modal-overlay.hidden { display: none; }

.modal-content {
    background: var(--modal-bg);
    width: 90%;
    max-width: 380px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
    animation: fadeInUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-header {
    padding: 1.1rem 1.25rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h3 {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--text-primary);
}
.modal-body { padding: 1.25rem; }
.setting-group { margin-bottom: 1.25rem; }
.setting-group:last-child { margin-bottom: 0; }
.setting-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.45rem;
}
.setting-desc {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-bottom: 0.6rem;
}
.color-picker { display: flex; gap: 0.6rem; }
.color-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 0;
}
.color-btn:hover { transform: scale(1.15); }
.color-btn.active { outline: 2px solid var(--accent); outline-offset: 2px; }

.timer-input-group { display: flex; align-items: center; gap: 0.45rem; }
.timer-input {
    width: 65px;
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 0.45rem;
    color: var(--text-primary);
    font-family: inherit;
    font-weight: 700;
    text-align: center;
    font-size: var(--text-sm);
}
.timer-suffix { font-size: var(--text-sm); color: var(--text-muted); font-weight: 600; }

.primary-btn {
    margin-left: auto;
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}
.primary-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 3px 12px var(--accent-glow);
    transform: translateY(-1px);
}

/* =============================================
   BREADCRUMB TRAIL
   ============================================= */
.breadcrumb-trail {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-wrap: nowrap;
    overflow: hidden;
}
.breadcrumb-trail span { cursor: pointer; transition: color 0.15s ease; white-space: nowrap; flex-shrink: 0; }
.breadcrumb-trail span:hover { color: var(--accent); }
.breadcrumb-trail span.active { color: var(--text-secondary); font-weight: 700; cursor: default; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.breadcrumb-trail span.active:hover { color: var(--text-secondary); }

/* =============================================
   DASHBOARD HERO & GRID
   ============================================= */
.dashboard-hero {
    background: linear-gradient(135deg, var(--accent) 0%, #000000 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    color: #ffffff;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 220px;
    border: 1px solid var(--border-light);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.dashboard-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 80% 20%, var(--accent-glow) 0%, transparent 50%);
    pointer-events: none;
}

.dashboard-hero-title {
    font-size: clamp(1.8rem, 1.8rem + 1vw, 2.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    color: #ffffff;
    max-width: 700px;
    z-index: 1;
}

.dashboard-hero-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    max-width: 550px;
    margin-bottom: 1.25rem;
    font-weight: 600;
    line-height: 1.45;
    z-index: 1;
}

.dashboard-hero-btn {
    align-self: flex-start;
    background: #ffffff;
    color: #000000;
    border: none;
    padding: 0.6rem 1.25rem;
    font-size: var(--text-xs);
    font-weight: 800;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    z-index: 1;
}

.dashboard-hero-btn:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.35);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
    margin-top: 0.5rem;
}

.topic-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.topic-card:hover {
    border-color: var(--accent);
    box-shadow: 0 6px 24px var(--accent-glow);
    transform: translateY(-3px);
}

.topic-card-header {
    padding: 0.9rem 1.1rem 0.65rem;
    background: var(--accent);
}
.topic-card-title {
    font-size: var(--text-sm);
    font-weight: 800;
    color: #fff;
    line-height: 1.35;
    word-break: break-word;
}

.topic-card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.65rem 0.85rem;
}

.subtopic-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0.6rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--text-xs);
    transition: all 0.15s ease;
}
.subtopic-row:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    transform: translateX(2px);
}
.subtopic-name {
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 0.4rem;
    min-width: 0;
    flex: 1;
}
.subtopic-badge {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-muted);
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    padding: 0.08rem 0.35rem;
    border-radius: var(--radius-pill);
    white-space: nowrap;
    flex-shrink: 0;
}

.topic-card-footer {
    border-top: 1px solid var(--border-light);
    padding: 0.6rem 1rem;
}
.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}
.progress-bar-container {
    width: 100%;
    height: 5px;
    background: var(--border-light);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar {
    height: 100%;
    background: var(--color-success);
    border-radius: 3px;
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* =============================================
   COMPLETE BUTTON
   ============================================= */
.complete-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    color: var(--text-muted);
    font-weight: 700;
    font-size: var(--text-xs);
    padding: 0.4rem 0.65rem;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    white-space: nowrap;
}
.complete-btn:hover { background: var(--btn-hover); color: var(--text-primary); border-color: var(--accent); }
.complete-btn.active { background: var(--color-success); color: #fff; border-color: var(--color-success); }
.complete-btn.hidden { display: none; }

/* ─── Utilities ─── */
.hidden { display: none !important; }
[data-aos] { pointer-events: auto !important; }

/* =============================================
   GAMIFICATION PANEL
   ============================================= */
.gamification-widget {
    margin: 0 0.75rem 0.75rem;
    flex-shrink: 0;
}

.gamification-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}
.gamification-panel:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 14px var(--accent-glow);
}

.game-level-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.game-level-badge {
    background: var(--accent);
    color: #ffffff;
    font-size: 0.72rem;
    font-weight: 800;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    letter-spacing: 0.02em;
    box-shadow: 0 2px 6px var(--accent-glow);
}

.game-xp-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.game-xp-label {
    font-size: 0.6rem;
    font-weight: 800;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.game-xp-val {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.game-progress-track {
    width: 100%;
    height: 6px;
    background: var(--input-bg);
    border-radius: 3px;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.game-progress-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.game-metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.4rem;
}

.game-metric-item {
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 0.4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: all 0.15s ease;
}

.game-metric-item.clickable {
    cursor: pointer;
}
.game-metric-item.clickable:hover {
    border-color: var(--accent);
    background: var(--btn-hover);
}

.game-metric-header {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    margin-bottom: 0.05rem;
}

.game-metric-icon {
    font-size: 0.85rem;
}

.game-metric-value {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
}

.game-metric-sub {
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ─── TOAST NOTIFICATION SYSTEM ─── */
.gamification-toast {
    position: fixed;
    bottom: 1.5rem;
    left: 1.5rem;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.25rem;
    font-size: var(--text-sm);
    font-weight: 700;
    box-shadow: var(--shadow-lg), 0 0 15px var(--accent-glow);
    z-index: 9999;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.gamification-toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* =============================================
   COSMETIC SHOP
   ============================================= */
.header-action-btns {
    display: flex;
    gap: 0.25rem;
}

.shop-modal-content {
    max-width: 450px;
}
.shop-balance {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.65rem 1rem;
    font-size: var(--text-sm);
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.shop-balance strong {
    color: var(--accent);
    font-size: var(--text-lg);
}
.shop-tabs {
    display: flex;
    background: var(--bg-elevated);
    border-radius: var(--radius-pill);
    padding: 2px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-light);
    gap: 2px;
}
.shop-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.45rem;
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-muted);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
}
.shop-tab-btn.active {
    background: var(--accent);
    color: #fff;
}
.shop-items-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.25rem;
}
.shop-item-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: border-color 0.15s ease;
}
.shop-item-card:hover {
    border-color: var(--accent);
}
.shop-item-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}
.shop-item-name {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
}
.shop-item-desc {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: 0.05rem;
}
.shop-item-action {
    flex-shrink: 0;
}
.shop-buy-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.4rem 0.8rem;
    font-size: var(--text-xs);
    font-weight: 700;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.shop-buy-btn:hover {
    background: var(--accent-hover);
}
.shop-buy-btn.owned {
    background: var(--bg-elevated);
    color: var(--text-muted);
    cursor: default;
    border: 1px solid var(--border-light);
}
.shop-buy-btn.active-cosmetic {
    background: var(--color-success);
    color: #fff;
    cursor: default;
}

/* ─── Challenges and Blitz Styles ─── */
.dashboard-challenges-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.challenge-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px var(--accent-glow);
    transform: translateY(-2px);
}
.challenge-icon {
    font-size: 1.75rem;
}
.challenge-details {
    flex: 1;
    min-width: 0;
}
.challenge-details h4 {
    font-size: var(--text-sm);
    font-weight: 800;
    margin-bottom: 0.15rem;
}
.challenge-details p {
    font-size: var(--text-xs);
    color: var(--text-muted);
}
.challenge-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    cursor: pointer;
    font-size: var(--text-xs);
    transition: all 0.15s ease;
    white-space: nowrap;
}
.challenge-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px var(--accent-glow);
}
.challenge-btn.completed {
    background: var(--bg-elevated);
    color: var(--text-muted);
    border: 1px solid var(--border-light);
    cursor: default;
}
.challenge-btn.completed:hover {
    transform: none;
    box-shadow: none;
}

/* ─── Blitz Header Overlay ─── */
.blitz-header {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.15) 0%, rgba(225, 29, 72, 0.15) 100%);
    border-bottom: 1px solid var(--border-light);
    padding: 0.75rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
    z-index: 5;
    flex-shrink: 0;
}
.blitz-header.hidden { display: none !important; }
.blitz-progress-text {
    font-size: var(--text-sm);
    font-weight: 800;
    letter-spacing: 0.02em;
}
.blitz-timer-container {
    display: flex;
    align-items: center;
    font-size: var(--text-sm);
    font-weight: 800;
    background: rgba(225, 29, 72, 0.15);
    color: var(--accent-rose, #E11D48);
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(225, 29, 72, 0.25);
}
.blitz-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.blitz-btn {
    font-family: inherit;
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    transition: all 0.15s ease;
}
.blitz-btn.success {
    background: var(--color-success, #059669);
    color: #fff;
}
.blitz-btn.success:hover {
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
    transform: translateY(-1px);
}
.blitz-btn.secondary {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
}
.blitz-btn.secondary:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
}
.blitz-btn.danger {
    background: transparent;
    color: var(--color-error, #EF4444);
    border: 1px solid rgba(239, 68, 68, 0.3);
}
.blitz-btn.danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

/* =============================================
   DESIGN POLISH — Decorative Motifs & Ambient Glows
   ============================================= */

/* Subtle grid pattern overlay on the sidebar */
.sidebar::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: radial-gradient(circle at 1px 1px, var(--border-light) 1px, transparent 0);
    background-size: 24px 24px;
    opacity: 0.25;
    pointer-events: none;
    z-index: 0;
}
.sidebar > * { position: relative; z-index: 1; }
.sidebar { position: relative; overflow: hidden; }

/* Animated accent glow on the sidebar header logo */
.logo svg {
    filter: drop-shadow(0 0 6px var(--accent-glow));
    transition: filter 0.3s ease;
}
.logo:hover svg {
    filter: drop-shadow(0 0 12px var(--accent));
}

/* Subtle gradient stripe on the top of each topic card */
.topic-card-header {
    background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 60%, #8B5CF6) 100%);
    position: relative;
    overflow: hidden;
}
.topic-card-header::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, rgba(255,255,255,0.15), transparent 60%);
    border-radius: 50%;
    pointer-events: none;
}

/* Dashboard hero decorative atoms/orbits motif */
.dashboard-hero::after {
    content: '';
    position: absolute;
    right: 3%;
    top: 50%;
    transform: translateY(-50%);
    width: 180px;
    height: 180px;
    border: 2px solid rgba(255,255,255,0.08);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}
.dashboard-hero {
    background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 40%, #1e1b4b) 70%, #000 100%);
}

/* Challenge cards — colored left border accent */
.daily-challenge-card { border-left: 4px solid #f59e0b; }
.blitz-challenge-card { border-left: 4px solid #8B5CF6; }
.review-challenge-card { border-left: 4px solid #06B6D4; }
.mock-challenge-card { border-left: 4px solid #EC4899; }

/* Progress bar gradient */
.progress-bar {
    background: linear-gradient(90deg, var(--accent) 0%, var(--color-success) 100%);
}

/* Gamification panel accent strip */
.gamification-panel {
    border-top: 3px solid var(--accent);
}

/* Nav item active glow dot */
.nav-item.active::after {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent);
    flex-shrink: 0;
    margin-left: auto;
}

/* Subtle shimmer animation for boss cards */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.pdf-card.boss-card {
    background-size: 200% 100%;
    background-image: linear-gradient(
        90deg, 
        var(--bg-card) 30%, 
        var(--accent-light) 50%, 
        var(--bg-card) 70%
    );
    animation: shimmer 6s ease-in-out infinite;
}

/* =============================================
   SRS DIFFICULTY RATING BUTTONS
   ============================================= */
.srs-rating-group {
    display: flex;
    gap: 0.35rem;
    margin-left: 0.5rem;
    animation: fadeInUp 0.25s ease;
}

.srs-rating-btn {
    font-family: inherit;
    font-size: 0.6rem;
    font-weight: 800;
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--bg-elevated);
    color: var(--text-muted);
}

.srs-rating-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.srs-rating-btn.easy {
    border-color: rgba(34, 197, 94, 0.4);
    color: #22C55E;
}
.srs-rating-btn.easy:hover {
    background: rgba(34, 197, 94, 0.15);
    border-color: #22C55E;
}
.srs-rating-btn.easy.active {
    background: #22C55E;
    color: #fff;
    border-color: #22C55E;
}

.srs-rating-btn.medium {
    border-color: rgba(245, 158, 11, 0.4);
    color: #F59E0B;
}
.srs-rating-btn.medium:hover {
    background: rgba(245, 158, 11, 0.15);
    border-color: #F59E0B;
}
.srs-rating-btn.medium.active {
    background: #F59E0B;
    color: #fff;
    border-color: #F59E0B;
}

.srs-rating-btn.hard {
    border-color: rgba(239, 68, 68, 0.4);
    color: #EF4444;
}
.srs-rating-btn.hard:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: #EF4444;
}
.srs-rating-btn.hard.active {
    background: #EF4444;
    color: #fff;
    border-color: #EF4444;
}

/* Review queue badge */
.review-badge {
    background: #EF4444;
    color: #fff;
    font-size: 0.55rem;
    font-weight: 800;
    padding: 0.12rem 0.4rem;
    border-radius: var(--radius-pill);
    margin-left: 0.35rem;
    min-width: 16px;
    text-align: center;
    animation: pulse 2s infinite;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

/* Review queue list */
.review-queue-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}
.review-card:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.review-urgency {
    font-size: 0.6rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-pill);
    white-space: nowrap;
}
.review-urgency.overdue {
    background: rgba(239, 68, 68, 0.15);
    color: #EF4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}
.review-urgency.due-today {
    background: rgba(245, 158, 11, 0.15);
    color: #F59E0B;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* =============================================
   RADAR CHART
   ============================================= */
.radar-chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.radar-chart-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #8B5CF6, #EC4899, var(--accent));
    background-size: 200% 100%;
    animation: shimmer 4s ease-in-out infinite;
}

.radar-chart-container:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.radar-chart-title {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.radar-chart-subtitle {
    font-size: var(--text-xs);
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.radar-chart-canvas-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

#radarChart {
    max-width: 100%;
}

.radar-tooltip {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    font-size: var(--text-xs);
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.15s ease;
    max-width: 220px;
    line-height: 1.5;
}

/* =============================================
   MOCK GENERATOR MODAL
   ============================================= */
.mock-modal-content {
    max-width: 520px;
}

.mock-config-group {
    margin-bottom: 1.25rem;
}
.mock-config-group:last-child { margin-bottom: 0; }

.mock-config-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.45rem;
}

.mock-config-desc {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

/* Paper type selector */
.mock-paper-types {
    display: flex;
    gap: 3px;
    background: var(--bg-elevated);
    padding: 3px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-light);
}

.mock-paper-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.5rem 0;
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-muted);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
}
.mock-paper-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 8px var(--accent-glow);
}
.mock-paper-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Question count slider */
.mock-slider-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.mock-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    outline: none;
}
.mock-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 8px var(--accent-glow);
    transition: transform 0.15s ease;
}
.mock-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.mock-slider-value {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--accent);
    min-width: 30px;
    text-align: center;
}

/* Topic checkboxes */
.mock-topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.mock-topic-checkbox {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: 600;
    user-select: none;
}
.mock-topic-checkbox:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.mock-topic-checkbox input[type="checkbox"] {
    accent-color: var(--accent);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.mock-topic-checkbox.checked {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--text-primary);
}

/* Timer input in mock generator */
.mock-timer-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.mock-timer-input input {
    width: 70px;
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 0.45rem;
    color: var(--text-primary);
    font-family: inherit;
    font-weight: 700;
    text-align: center;
    font-size: var(--text-sm);
}
.mock-timer-input input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
    outline: none;
}

/* Generate button */
.mock-generate-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent) 0%, #8B5CF6 100%);
    color: #fff;
    border: none;
    padding: 0.75rem;
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 800;
    border-radius: var(--radius-pill);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    transition: all 0.2s ease;
    margin-top: 0.75rem;
}
.mock-generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

/* Mock results summary */
.mock-results-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--modal-overlay);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.2s ease;
}
.mock-results-overlay.hidden { display: none; }

.mock-results-card {
    background: var(--modal-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 420px;
    width: 90%;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    text-align: center;
    animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mock-results-score {
    font-size: clamp(2.5rem, 2rem + 2vw, 3.5rem);
    font-weight: 900;
    color: var(--accent);
    margin: 0.75rem 0;
    line-height: 1;
}

.mock-results-subtitle {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 1rem;
}

.mock-results-stats {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}
.mock-stat-item {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 0.65rem;
}
.mock-stat-value {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--text-primary);
}
.mock-stat-label {
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.mock-results-close {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.6rem 2rem;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}
.mock-results-close:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 15px var(--accent-glow);
}

/* =============================================
   NOTIFICATION PILL (success/info/error)
   ============================================= */
.notification-pill {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 700;
    padding: 0.6rem 1.1rem;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-lg), 0 0 20px var(--accent-glow);
    z-index: 9999;
    animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    max-width: 380px;
}
.notification-pill.success { border-color: #22C55E; box-shadow: var(--shadow-lg), 0 0 20px rgba(34, 197, 94, 0.25); }
.notification-pill.error { border-color: #EF4444; box-shadow: var(--shadow-lg), 0 0 20px rgba(239, 68, 68, 0.25); }
.notification-pill.info { border-color: #3B82F6; box-shadow: var(--shadow-lg), 0 0 20px rgba(59, 130, 246, 0.25); }

/* Mock Toggles Container and Pills */
.mock-toggles-container {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    max-width: 60%;
    justify-content: center;
    align-items: center;
}

.mock-q-pill {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.65rem;
    font-weight: 800;
    padding: 0.25rem 0.55rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    text-transform: uppercase;
}

.mock-q-pill:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.mock-q-pill.active {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Predictor Select Options styling */
#predictorSubject option, #predictorSession option {
    background: var(--bg-card) !important;
    color: var(--text-primary) !important;
}

/* =============================================
   WORKSPACE HOMESCREEN (APPLE SCROLL-SNAP THEMES STYLE)
   ============================================= */
.workspace-scroll-container {
    height: 100%;
    flex: 1;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    background: #040406;
    background-image: 
        radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.14) 0%, transparent 60%),
        radial-gradient(circle at 15% 85%, rgba(139, 92, 246, 0.1) 0%, transparent 55%),
        radial-gradient(circle at 85% 75%, rgba(236, 72, 153, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(15, 15, 20, 0.7) 0%, #020204 100%);
    background-size: 100% 100%;
    position: relative;
}

/* Volumetric grainy overlay on scroll container */
.workspace-scroll-container::before {
    content: "";
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    opacity: 0.024;
    pointer-events: none;
    z-index: 1;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Sticky Top Navigation (Floats over all snapping sections) */
.workspace-top-nav {
    position: absolute;
    top: 1.25rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 2.25rem;
    z-index: 1000; /* Extra high to prevent hovered cards from bleeding through */
    background: rgba(18, 18, 22, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.05);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.workspace-top-nav:hover {
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 12px 45px rgba(0, 0, 0, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.08);
}

.workspace-logo {
    font-size: 0.9rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.workspace-menu {
    display: flex;
    gap: 2.25rem;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 0.45rem 1.75rem;
    border-radius: var(--radius-pill);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.3s ease;
}
.workspace-menu:hover {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.menu-link {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.25s ease, transform 0.25s ease, text-shadow 0.25s ease;
    cursor: pointer;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.menu-link:hover {
    color: var(--accent);
    transform: translateY(-1px);
    text-shadow: 0 0 8px var(--accent-glow);
}

.workspace-cta-btn {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.55rem 1.35rem;
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease, filter 0.25s ease;
    letter-spacing: 0.02em;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.workspace-cta-btn:hover {
    transform: translateY(-2px) scale(1.02);
    filter: brightness(1.1);
    box-shadow: 0 8px 20px var(--accent-glow), 0 0 0 2px rgba(255, 255, 255, 0.15);
}

/* Individual Slides */
.scroll-slide {
    height: 100%;
    min-height: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 6rem 3rem 3rem; /* Extra top padding to clear sticky nav */
    position: relative;
}

/* Slide 1: Welcome Slide */
.hero-slide {
    align-items: center;
    justify-content: center;
    padding-top: 2rem;
}

.workspace-center-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex: 1;
    z-index: 5;
}

.globe-container {
    margin-bottom: 2.25rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.wireframe-globe {
    width: 62px;
    height: 62px;
    color: var(--text-muted);
    opacity: 0.4;
    animation: rotateGlobe 28s linear infinite;
}

@keyframes rotateGlobe {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.workspace-body-text {
    font-size: 1.12rem;
    font-weight: 500;
    color: var(--text-secondary);
    max-width: 580px;
    line-height: 1.8;
    text-align: center;
    margin: 0;
    letter-spacing: -0.01em;
}

/* Bottom Scroll Hint */
.scroll-down-hint {
    position: absolute;
    bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: rgba(255, 255, 255, 0.35);
    font-size: 0.78rem;
    font-weight: 700;
    gap: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    animation: hintBounce 2s infinite ease-in-out;
    pointer-events: none;
    user-select: none;
    z-index: 5;
}

.hint-arrow {
    font-size: 1rem;
    line-height: 1;
}

@keyframes hintBounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); opacity: 0.35; }
    40% { transform: translateY(-5px); opacity: 0.7; }
    60% { transform: translateY(-2px); opacity: 0.5; }
}

/* Slides 2+: Theme Slide Details */
.theme-slide-header {
    margin-bottom: 1.75rem;
    z-index: 5;
}

.theme-slide-header h2 {
    font-size: 1.85rem;
    font-weight: 900;
    letter-spacing: -0.025em;
    color: #ffffff;
    margin: 0;
}

.theme-cards-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    width: 100%;
    z-index: 5;
    overflow-y: auto;
    padding-bottom: 1rem;
}

.theme-subcat-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.15rem;
    cursor: pointer;
    position: relative;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    flex: 1 1 calc(33.33% - 1.25rem); /* Dynamic bubble flexibility to fill row width */
    min-width: 280px;
    max-width: 100%;
}

.theme-subcat-card:hover {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.03);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.theme-subcat-card:hover .card-arrow {
    transform: translate(2px, -2px);
    color: var(--accent);
}

.card-progress-ring {
    width: 48px;
    height: 48px;
    position: relative;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-ring-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring-bg {
    stroke: rgba(255, 255, 255, 0.04);
}

.ring-fill {
    stroke-linecap: round;
    transition: stroke-dasharray 0.35s ease;
}

.ring-text {
    position: absolute;
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--text-primary);
}

.card-meta {
    flex: 1;
}

.card-meta h3 {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
    line-height: 1.4;
}

.card-meta p {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1;
}

.card-arrow {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    transition: transform 0.25s ease, color 0.25s ease;
}

/* Snapped scroll adjustments on outer list wrapper */
.papers-grid.no-grid {
    display: flex;
    flex-direction: column;
    padding: 0 !important;
    margin: 0 !important;
    gap: 0 !important;
    height: 100%;
    flex: 1;
    overflow: hidden;
    position: relative; /* Anchor for absolute stationary header overlay */
}

/* Hide top header overlay when any modal is active/visible */
body:has(.modal-overlay:not(.hidden)) .workspace-top-nav {
    display: none !important;
}

/* =============================================
   REVISIONDOJO SIDEBAR & HOMEPAGE DESIGN SYSTEM
   ============================================= */

/* Brand Header */
.sidebar-brand {
    padding: 1.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
}
.brand-logo {
    color: var(--accent);
    filter: drop-shadow(0 0 8px var(--accent-glow));
    transition: transform 0.3s ease, filter 0.3s ease;
}
.sidebar-brand:hover .brand-logo {
    transform: rotate(10deg) scale(1.05);
    filter: drop-shadow(0 0 12px var(--accent));
}

/* Sidebar navigation */
.sidebar-nav {
    flex: 1;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow-y: auto;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 0.95rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: 600;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    position: relative;
    border-left: 2px solid transparent;
}
.nav-link svg {
    color: var(--text-muted);
    transition: color 0.25s ease, transform 0.25s ease;
}
.nav-link:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
    padding-left: 1.1rem;
}
.nav-link:hover svg {
    color: var(--text-primary);
    transform: scale(1.05);
}
.nav-link.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 700;
    border-left: 3px solid var(--accent);
    box-shadow: inset 4px 0 15px rgba(255, 255, 255, 0.01);
}
.nav-link.active svg {
    color: var(--accent);
    filter: drop-shadow(0 0 5px var(--accent-glow));
}

.nav-section-title {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 1.25rem 0.85rem 0.45rem;
}

/* Subject dots */
.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.physics-dot { background: #3B82F6; }
.chem-dot { background: #22C55E; }

/* Profile widget card */
.sidebar-profile-card {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(0, 0, 0, 0.15);
}
.profile-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent) 0%, rgba(255,255,255,0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}
.profile-meta {
    flex: 1;
    min-width: 0;
}
.profile-name {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.profile-title {
    font-size: 0.68rem;
    color: var(--text-muted);
    font-weight: 500;
}
.settings-gear-btn {
    background: none;
    border: none;
    padding: 0.35rem;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.settings-gear-btn:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
}

/* Dojo Homepage Main Panel Styles */
.dojo-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2.25rem;
    border-bottom: 1px solid var(--border-light);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
}
.dojo-search-container {
    position: relative;
    width: 280px;
}
.dojo-search-container input {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-pill);
    padding: 0.55rem 1rem 0.55rem 2.35rem;
    font-size: 0.8rem;
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(10px);
}
.dojo-search-container input:focus {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 15px var(--accent-glow), inset 0 1px 1px rgba(255, 255, 255, 0.1);
}
.dojo-search-container .search-icon {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.dojo-user-metrics {
    display: flex;
    gap: 1.15rem;
}
.dojo-metric {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    color: var(--text-secondary);
    transition: all 0.25s ease;
    backdrop-filter: blur(10px);
}
.dojo-metric:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

/* Dojo Promo Banner */
.dojo-promo-banner {
    margin: 1.5rem 2.25rem;
    padding: 1.35rem 1.75rem;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.12) 0%, rgba(236, 72, 153, 0.04) 100%),
                rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(168, 85, 247, 0.15);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}
.promo-text h3 {
    font-size: var(--text-xl);
    font-weight: 800;
    color: #ffffff;
    margin: 0 0 0.25rem 0;
    letter-spacing: -0.015em;
}
.promo-text p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin: 0;
}
.promo-timer {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.45rem;
}
.promo-timer span {
    font-size: 0.72rem;
    font-weight: 700;
    color: #ec4899;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.promo-btn {
    background: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
    color: #ffffff;
    border: none;
    padding: 0.45rem 1.15rem;
    border-radius: var(--radius-md);
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.promo-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.35);
}

/* Dojo Subjects Section */
.dojo-section-title {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--text-primary);
    margin: 1.5rem 2.25rem 0.85rem;
    letter-spacing: -0.01em;
}

.dojo-subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    padding: 0 2.25rem;
}

.dojo-subject-card {
    border-radius: var(--radius-lg);
    padding: 1.65rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    position: relative;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.01);
    backdrop-filter: blur(10px);
}
.dojo-subject-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    opacity: 0.03;
    background-image: radial-gradient(circle at 100% 0%, var(--subject-accent) 0%, transparent 60%);
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.dojo-subject-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--subject-accent);
}
.dojo-subject-card:hover::before {
    opacity: 0.08;
}

/* Individual Subject Card Colors */
.card-physics {
    --subject-accent: #3B82F6;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(59, 130, 246, 0.01) 100%), rgba(255, 255, 255, 0.01);
}
.card-physics:hover {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.45), 0 0 20px rgba(59, 130, 246, 0.2);
}
.card-chem {
    --subject-accent: #22C55E;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.08) 0%, rgba(34, 197, 94, 0.01) 100%), rgba(255, 255, 255, 0.01);
}
.card-chem:hover {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.45), 0 0 20px rgba(34, 197, 94, 0.2);
}

.subject-card-icon {
    font-size: 2.25rem;
    flex-shrink: 0;
}
.subject-card-content {
    flex: 1;
    min-width: 0;
}
.subject-card-content h3 {
    font-size: 0.95rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0 0 0.2rem 0;
    letter-spacing: -0.01em;
}
.subject-card-content p {
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin: 0;
}

.subject-open-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #ffffff;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-pill);
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}
.dojo-subject-card:hover .subject-open-btn {
    background: var(--subject-accent);
    border-color: var(--subject-accent);
}

/* Dojo Shortcuts Row */
.dojo-shortcuts-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    padding: 0 2.25rem 2rem;
}
.shortcut-pill {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(10px);
}
.shortcut-pill:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--accent-glow);
}

/* Science Orb / Quantum Gravity Animation */
.science-orb-container {
    position: relative;
    width: 180px;
    height: 180px;
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 800px;
}

.orb-nucleus {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: radial-gradient(circle, #ffffff 0%, var(--accent) 70%, rgba(0,0,0,0.8) 100%);
    box-shadow: 0 0 35px var(--accent),
                0 0 70px var(--accent),
                inset 0 0 10px rgba(255, 255, 255, 0.8);
    position: absolute;
    z-index: 2;
    animation: pulseNucleus 4s ease-in-out infinite alternate;
}

@keyframes pulseNucleus {
    0% {
        transform: scale(0.9);
        box-shadow: 0 0 25px var(--accent), 0 0 50px var(--accent);
    }
    100% {
        transform: scale(1.1);
        box-shadow: 0 0 45px var(--accent), 0 0 90px var(--accent), 0 0 120px rgba(255, 255, 255, 0.2);
    }
}

.orb-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 1.5px solid rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    z-index: 1;
    transform-style: preserve-3d;
}

.ring-1 {
    width: 170px;
    height: 170px;
    border-color: rgba(59, 130, 246, 0.15);
    animation: spinRing1 12s linear infinite;
}
.ring-2 {
    width: 140px;
    height: 140px;
    border-color: rgba(168, 85, 247, 0.15);
    animation: spinRing2 16s linear infinite;
}
.ring-3 {
    width: 110px;
    height: 110px;
    border-color: rgba(6, 182, 212, 0.15);
    animation: spinRing3 8s linear infinite;
}

.orb-particle {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px currentColor;
}

.p-1 {
    background: #3b82f6;
    color: #3b82f6;
    box-shadow: 0 0 20px #3b82f6;
}
.p-2 {
    background: #a855f7;
    color: #a855f7;
    box-shadow: 0 0 20px #a855f7;
}
.p-3 {
    background: #06b6d4;
    color: #06b6d4;
    box-shadow: 0 0 20px #06b6d4;
}

@keyframes spinRing1 {
    0% { transform: rotateX(65deg) rotateY(15deg) rotateZ(0deg); }
    100% { transform: rotateX(65deg) rotateY(15deg) rotateZ(360deg); }
}
@keyframes spinRing2 {
    0% { transform: rotateX(45deg) rotateY(-30deg) rotateZ(360deg); }
    100% { transform: rotateX(45deg) rotateY(-30deg) rotateZ(0deg); }
}
@keyframes spinRing3 {
    0% { transform: rotateX(75deg) rotateY(45deg) rotateZ(0deg); }
    100% { transform: rotateX(75deg) rotateY(45deg) rotateZ(360deg); }
}

.orb-particles-glow {
    position: absolute;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.02) 0%, rgba(0, 0, 0, 0) 70%);
    pointer-events: none;
    z-index: 0;
}


/* =============================================
   RESPONSIVE OVERRIDES WHEN VIEWING PDF (360PX SIDEBAR)
   ============================================= */
.content-area.viewing-pdf .workspace-top-nav {
    top: 0.5rem;
    left: 0.5rem;
    right: 0.5rem;
    padding: 0.5rem 0.75rem;
    justify-content: center;
    border-radius: var(--radius-md);
}
.content-area.viewing-pdf .workspace-top-nav .workspace-logo,
.content-area.viewing-pdf .workspace-top-nav .workspace-cta-btn {
    display: none !important;
}
.content-area.viewing-pdf .workspace-top-nav .workspace-menu {
    width: 100%;
    justify-content: space-around;
    padding: 0.35rem 0.5rem;
    gap: 0.5rem;
}
.content-area.viewing-pdf .workspace-top-nav .menu-link {
    font-size: 0.7rem;
    letter-spacing: 0.01em;
}
.content-area.viewing-pdf .scroll-slide {
    padding: 4.5rem 1rem 1rem;
}
.content-area.viewing-pdf .theme-slide-header h2 {
    font-size: 1.25rem;
}
.content-area.viewing-pdf .theme-subcat-card {
    flex: 1 1 100%;
    max-width: 100%;
    padding: 1rem;
    gap: 0.75rem;
}
.content-area.viewing-pdf .science-orb-container {
    width: 120px;
    height: 120px;
    margin-bottom: 1.5rem;
}
.content-area.viewing-pdf .workspace-body-text {
    font-size: var(--text-xs);
    line-height: 1.4;
    padding: 0 1rem;
}
.content-area.viewing-pdf .hero-slide h1 {
    font-size: var(--text-xl);
}

/* Flex-wrap for PDF toolbar to prevent button overflow */
.viewer-header {
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    padding: 0.5rem 1rem;
}
.viewer-toolbar {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.3rem;
}

/* --- Safe Areas & Notch Support --- */
.app-container {
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
    background: var(--bg-main); /* Ensure background is solid behind safe area */
}

/* Make sure canvas has touch-action: none to disable native scrolling while drawing */
canvas {
    touch-action: none;
}

/* Sidebar Toggle Menu Button - Hidden by default on desktop */
.sidebar-toggle-btn {
    display: none;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    margin-right: 12px;
    flex-shrink: 0;
}
.sidebar-toggle-btn:hover {
    background: var(--btn-hover);
}

/* Mobile Sidebar Drawer Backdrop Overlay */
.sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.25s ease;
}
.sidebar-backdrop.active {
    display: block;
    opacity: 1;
}

/* --- Media Queries for Mobile Responsiveness --- */

/* 1. Tablet & IPad Portrait Layouts (Under 1024px) */
@media (max-width: 1024px) {
    /* Hide resize handle - split pane is too crowded */
    .resize-handle {
        display: none !important;
    }
    
    /* When viewing PDF, PDF viewer covers full screen over list-pane */
    .viewer-pane {
        position: fixed !important;
        top: env(safe-area-inset-top, 0px);
        left: 0;
        width: 100vw !important;
        height: calc(100vh - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px)) !important;
        z-index: 100;
        box-shadow: var(--shadow-lg);
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    /* When active (not hidden), slide in the PDF viewer */
    .viewer-pane:not(.hidden) {
        display: flex !important;
        transform: translateX(0);
    }
    
    /* Keep list-pane full width when viewer is hidden */
    .list-pane {
        width: 100% !important;
        flex: 1 !important;
    }
    
    /* Make PDF card grid fully responsive */
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)) !important;
    }
}

/* 2. Mobile Phone Layouts (Under 768px) */
@media (max-width: 768px) {
    /* Enable Hamburger Sidebar Drawer */
    .sidebar-toggle-btn {
        display: inline-flex;
    }
    
    .sidebar {
        position: fixed !important;
        top: 0;
        left: 0;
        height: 100vh !important;
        width: 280px !important;
        z-index: 1000 !important;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    /* Adjust grid styling for dense layouts */
    .dashboard-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    
    /* Scale workspace top nav logo/bar */
    .workspace-top-nav {
        flex-wrap: wrap;
        gap: 0.75rem;
        padding: 0.75rem 1rem !important;
    }
    
    .workspace-menu {
        overflow-x: auto;
        width: 100%;
        padding-bottom: 4px;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start !important;
        gap: 1.25rem !important;
    }
    .workspace-menu::-webkit-scrollbar {
        height: 2px;
    }
    
    .workspace-logo {
        font-size: 1rem !important;
    }
    .workspace-cta-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    
    .breadcrumb-trail {
        font-size: var(--text-xs);
    }
    
    #currentCategoryTitle {
        font-size: var(--text-lg) !important;
    }
}