/* Modern Minimal Theme (Pro Max) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* Critical: iOS Safari viewport fixes */
html {
    height: 100%;
    height: -webkit-fill-available;
    overflow-x: hidden;
    overflow-y: auto; /* Enable vertical scrolling */
    max-width: 100vw;
}

body {
    min-height: 100%;
    min-height: -webkit-fill-available;
    min-height: 100dvh;
    position: relative;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    overflow-y: scroll; /* Ensure body can scroll */
    width: 100%;
    max-width: 100vw;
}

/* Ensure fixed elements work on iOS */
html,
body {
    overscroll-behavior-x: none; /* Only prevent horizontal overscroll, not vertical */
}

:root {
    /* Minimal Palette - Light Mode */
    --font-sans: 'Inter', system-ui, -apple-system, blinkmacsystemfont, "Segoe UI", roboto, "Helvetica Neue", arial, sans-serif;

    /* Primary: Deep Royal Blue */
    --primary: #2563eb;
    /* Royal Blue 600 */
    --primary-hover: #1d4ed8;
    /* Royal Blue 700 */
    --primary-subtle: #eff6ff;
    /* Royal Blue 50 */
    --primary-text: #ffffff;

    /* Neutral: Slate Scale (High Contrast) */
    --bg-body: #f8fafc;
    /* Slate 50 - Clean, professional background */
    --bg-surface: #ffffff;
    /* White - for cards and surfaces */
    --bg-subtle: #f1f5f9;
    /* Slate 100 - subtle backgrounds */

    --text-main: #0f172a;
    /* Slate 900 - Deepest */
    --text-secondary: #334155;
    /* Slate 700 */
    --text-muted: #64748b;
    /* Slate 500 */

    --border-subtle: #e2e8f0;
    /* Slate 200 */
    --border-medium: #cbd5e1;
    /* Slate 300 */
    --border-focus: #2563eb;

    /* Shadows: Soft & Diffused */
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.05), 0 1px 2px -1px rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.05);

    /* Radius: Soft & Friendly */
    --radius-sm: 0.5rem;
    /* 8px */
    --radius-md: 0.75rem;
    /* 12px */
    --radius-lg: 1rem;
    /* 16px */
    --radius-xl: 1.5rem;
    /* 24px */
    --radius-full: 9999px;

    /* Status Colors */
    --success: #10b981;
    /* Emerald 500 */
    --warning: #f59e0b;
    /* Amber 500 */
    --danger: #ef4444;
    /* Red 500 */
    --info: #06b6d4;
    /* Cyan 500 */
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-body: #020617;
    /* Slate 950 */
    --bg-surface: #0f172a;
    /* Slate 900 */
    --bg-subtle: #1e293b;
    /* Slate 800 */

    --text-main: #f8fafc;
    /* Slate 50 */
    --text-secondary: #cbd5e1;
    /* Slate 300 */
    --text-muted: #94a3b8;
    /* Slate 400 */

    --border-subtle: #1e293b;
    /* Slate 800 */
    --border-medium: #334155;
    /* Slate 700 */

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

/* Ensure PWA Install Banner is solid and visible */
#pwa-install-banner {
    background-color: var(--bg-surface) !important;
    opacity: 1 !important;
    backdrop-filter: none !important;
    border: 2px solid var(--primary) !important;
}

[data-theme="dark"] #pwa-install-banner {
    background-color: #1e293b !important;
    border-color: #3b82f6 !important;
}

/* Dark Mode: Dropdowns with solid background */
[data-theme="dark"] .dropdown-menu {
    background-color: #0f172a !important;
    border-color: #334155 !important;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] .dropdown-item {
    color: #f8fafc !important;
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
    background-color: #1e293b !important;
    color: #f8fafc !important;
}

[data-theme="dark"] .dropdown-divider {
    border-color: #1e293b !important;
}

/* Dark Mode: Icon Boxes */
[data-theme="dark"] .icon-box {
    background-color: rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .icon-box-orange {
    background-color: rgba(249, 115, 22, 0.15) !important;
    color: #fb923c !important;
}

[data-theme="dark"] .icon-box-blue {
    background-color: rgba(59, 130, 246, 0.15) !important;
    color: #60a5fa !important;
}

[data-theme="dark"] .icon-box-red {
    background-color: rgba(239, 68, 68, 0.15) !important;
    color: #f87171 !important;
}

[data-theme="dark"] .icon-box-indigo {
    background-color: rgba(99, 102, 241, 0.15) !important;
    color: #818cf8 !important;
}

[data-theme="dark"] .icon-box-green {
    background-color: rgba(34, 197, 94, 0.15) !important;
    color: #4ade80 !important;
}

/* Modals with solid background */
.modal-content {
    background-color: #ffffff !important;
    border: 1px solid var(--border-subtle);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* Dark Mode: Modals with solid background */
[data-theme="dark"] .modal-content {
    background-color: #0f172a !important;
    border-color: #334155 !important;
}

[data-theme="dark"] .modal-header {
    border-color: #334155 !important;
}

[data-theme="dark"] .modal-footer {
    border-color: #334155 !important;
}

[data-theme="dark"] .form-select.bg-light,
[data-theme="dark"] .form-control.bg-light {
    background-color: #1e293b !important;
    color: #f8fafc !important;
    border-color: #334155 !important;
}

/* =====================================================
   Dropdown Menus - Solid Backgrounds
   ===================================================== */
.dropdown-menu {
    background-color: #ffffff !important;
    border: 1px solid #e2e8f0;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
}

.dropdown-item {
    color: #0f172a;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: #f1f5f9;
    color: #0f172a;
}

.dropdown-divider {
    border-color: #e2e8f0;
}

[data-theme="dark"] .dropdown-menu {
    background-color: #1e293b !important;
    border-color: #334155 !important;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .dropdown-item {
    color: #f8fafc !important;
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
    background-color: #334155 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .dropdown-divider {
    border-color: #334155 !important;
}

/* =====================================================
   Popovers - Solid Backgrounds
   ===================================================== */
.popover {
    background-color: #ffffff !important;
    border: 1px solid #e2e8f0;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.popover-header {
    background-color: #f8fafc;
    border-bottom-color: #e2e8f0;
}

.popover-body {
    color: #0f172a;
}

[data-theme="dark"] .popover {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}

[data-theme="dark"] .popover-header {
    background-color: #0f172a !important;
    border-bottom-color: #334155 !important;
    color: #f8fafc !important;
}

[data-theme="dark"] .popover-body {
    color: #f8fafc !important;
}

[data-theme="dark"] .popover .popover-arrow::before,
[data-theme="dark"] .popover .popover-arrow::after {
    border-color: #1e293b !important;
}

/* =====================================================
   Tooltips - Solid Backgrounds
   ===================================================== */
.tooltip-inner {
    background-color: #0f172a;
    color: #ffffff;
}

[data-theme="dark"] .tooltip-inner {
    background-color: #f8fafc !important;
    color: #0f172a !important;
}

/* =====================================================
   Floating Menus / Off-canvas - Solid Backgrounds
   ===================================================== */
.offcanvas {
    background-color: #ffffff;
}

.offcanvas-header {
    border-bottom: 1px solid #e2e8f0;
}

[data-theme="dark"] .offcanvas {
    background-color: #0f172a !important;
}

[data-theme="dark"] .offcanvas-header {
    border-bottom-color: #334155 !important;
}

[data-theme="dark"] .offcanvas-title {
    color: #f8fafc !important;
}

/* Mobile Offcanvas - Proper positioning to avoid overlap with navbars */
@media (max-width: 768px) {
    .offcanvas {
        top: 56px !important;
        height: calc(100% - 56px - 80px) !important;
        margin-bottom: 80px;
    }

    .offcanvas-end {
        border-left: 1px solid #e2e8f0;
    }

    [data-theme="dark"] .offcanvas-end {
        border-left-color: #334155 !important;
    }

    .offcanvas-body {
        padding-bottom: 2rem;
    }
}

/* =====================================================
   Toast / Alert Notifications - Solid Backgrounds
   ===================================================== */
.toast {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
}

[data-theme="dark"] .toast {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}

[data-theme="dark"] .toast-header {
    background-color: #0f172a !important;
    border-bottom-color: #334155 !important;
    color: #f8fafc !important;
}

[data-theme="dark"] .toast-body {
    color: #f8fafc !important;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.625;
    /* Improved readability per UX best practices */
}

/* Pro Max: Clickable Cursors & No Outline */
.btn,
.nav-link,
.card[onclick],
.dropdown-item,
.form-check-input {
    cursor: pointer;
}

*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Pro Max: Smooth Transitions */
button,
a,
input,
select,
textarea,
.card,
.badge {
    transition-duration: 0.2s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    letter-spacing: -0.025em;
    font-weight: 700;
    /* Sturdy display headers */
    color: var(--text-main);
    line-height: 1.25;
}

/* Cards: Soft & Lifted */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    overflow: hidden;
    /* Prevent content overflow */
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-medium);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Buttons: Pill Shape & Scale */
.btn {
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-full);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    /* Icon spacing */
    font-size: 0.95rem;
}

.btn:active {
    transform: scale(0.96);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    color: var(--primary-text);
    box-shadow: 0 2px 4px 0 rgb(37 99 235 / 0.25);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 4px 8px -1px rgb(37 99 235 / 0.35);
    transform: translateY(-1px);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--border-medium);
    background-color: transparent;
}

.btn-outline-primary:hover {
    background-color: var(--primary-subtle);
    color: var(--primary-hover);
    border-color: var(--primary);
}

/* Inputs: Floating or Clean */
.form-control,
.form-select {
    border-color: var(--border-medium);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    background-color: var(--bg-surface);
    color: var(--text-main);
    font-size: 1rem;
    min-height: 48px;
    /* Touch target */
    box-shadow: var(--shadow-sm);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-subtle);
}

.form-floating>.form-control:focus~label,
.form-floating>.form-control:not(:placeholder-shown)~label {
    color: var(--primary);
    transform: scale(0.85) translateY(-0.75rem) translateX(0.15rem);
}

/* Navbar: Sticky & Blur */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border-subtle);
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    position: sticky;
    top: 0;
    z-index: 1030;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

[data-theme="dark"] .navbar {
    background-color: rgba(15, 23, 42, 0.95);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem !important;
    transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background-color: var(--primary-subtle);
}

[data-theme="dark"] .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Mobile Bottom Nav */
.bottom-nav {
    display: none;
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    background-color: rgba(255, 255, 255, 0.85) !important;
    border-top: 1px solid var(--border-subtle);
    padding: 0.5rem 0;
    padding-bottom: calc(0.5rem + env(safe-area-inset-bottom, 0px));
    z-index: 9998 !important;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

[data-theme="dark"] .bottom-nav {
    background-color: rgba(15, 23, 42, 0.85) !important;
    border-top-color: #1e293b;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.bottom-nav-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--radius-lg);
    flex: 1;
    text-align: center;
    transition: all 0.2s ease;
}

.bottom-nav-item i {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bottom-nav-item.active {
    color: var(--primary);
    font-weight: 600;
    background-color: var(--primary-subtle);
    border-radius: var(--radius-md);
}

.bottom-nav-item.active i {
    transform: translateY(-2px) scale(1.1);
}

[data-theme="dark"] .bottom-nav-item.active {
    background-color: rgba(37, 99, 235, 0.15);
}

/* Utilities */
.text-muted {
    color: var(--text-muted) !important;
}

.bg-light {
    background-color: var(--bg-subtle) !important;
}

.rounded-3 {
    border-radius: var(--radius-md) !important;
}

.rounded-4 {
    border-radius: var(--radius-lg) !important;
}

.shadow-sm {
    box-shadow: var(--shadow-sm) !important;
}

.g-3 {
    --bs-gutter-y: 1.5rem;
    --bs-gutter-x: 1.5rem;
}

/* Interactive Table (Recent Activity) */
.table-hover>tbody>tr {
    transition: background-color 0.15s ease;
    cursor: pointer;
}

.table-hover>tbody>tr:hover {
    background-color: var(--primary-subtle);
}

/* Dashboard Icon Boxes */
.icon-box {
    width: 64px;
    height: 64px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.icon-box-orange {
    background-color: #fff7ed;
    color: #ea580c;
}

.icon-box-blue {
    background-color: #eff6ff;
    color: #2563eb;
}

.icon-box-red {
    background-color: #fef2f2;
    color: #ef4444;
}

.icon-box-indigo {
    background-color: #e0e7ff;
    color: #4338ca;
}

.icon-box-green {
    background-color: #dcfce7;
    color: #16a34a;
}

/* Dark Mode Icons */
[data-theme="dark"] .icon-box-orange {
    background-color: rgba(234, 88, 12, 0.15);
    color: #fb923c;
}

[data-theme="dark"] .icon-box-blue {
    background-color: rgba(37, 99, 235, 0.15);
    color: #60a5fa;
}

[data-theme="dark"] .icon-box-red {
    background-color: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

[data-theme="dark"] .icon-box-indigo {
    background-color: rgba(79, 70, 229, 0.15);
    color: #818cf8;
}

[data-theme="dark"] .icon-box-green {
    background-color: rgba(22, 163, 74, 0.15);
    color: #4ade80;
}

/* Custom Warning Card */
.card-subtle-warning {
    background-color: #fffbeb;
    /* amber-50 */
    border: 1px solid #fcd34d;
}

.card-subtle-warning .text-warning {
    color: #d97706 !important;
    /* amber-600 */
}

[data-theme="dark"] .card-subtle-warning {
    background-color: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
}

[data-theme="dark"] .card-subtle-warning .text-warning {
    color: #fbbf24 !important;
    /* amber-400 */
}

/* Custom Text Dark Override for Buttons */
.custom-text-dark {
    color: #212529 !important;
}

/* Mobile Visibility */
@media (max-width: 768px) {
    .bottom-nav {
        display: block !important;
    }

    .desktop-nav-items {
        display: none !important;
    }

    body {
        padding-bottom: 90px !important;
        /* Safe area for notched devices */
        padding-bottom: calc(90px + env(safe-area-inset-bottom)) !important;
    }

    /* Mobile Navbar Buttons - Transparent */
    .navbar .btn-light,
    .navbar .btn-light:hover,
    .navbar .btn-light:focus,
    .navbar .btn-light:active {
        background-color: transparent !important;
        border-color: transparent !important;
        color: var(--text-main) !important;
        box-shadow: none !important;
    }

    [data-theme="dark"] .navbar .btn-light {
        color: #f8fafc !important;
    }

    /* Audio Player Custom Sliders */
    .audio-player-custom .form-range {
        height: 4px;
        padding: 0;
        background-color: transparent;
    }

    .audio-player-custom .form-range::-webkit-slider-thumb {
        -webkit-appearance: none;
        appearance: none;
        width: 12px;
        height: 12px;
        background: var(--primary);
        border-radius: 50%;
        cursor: pointer;
        margin-top: -4px;
        /* Align thumb vertically */
        box-shadow: 0 0 0 2px #fff;
    }

    .audio-player-custom .form-range::-webkit-slider-runnable-track {
        width: 100%;
        height: 4px;
        cursor: pointer;
        background: #e2e8f0;
        border-radius: 2px;
    }

    [data-theme="dark"] .audio-player-custom .form-range::-webkit-slider-runnable-track {
        background: #334155;
    }

    .navbar .btn-light {
        background-color: transparent !important;
        border: none !important;
        color: var(--text-main);
    }

    .navbar {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        padding: 0.5rem 1rem;
        padding-top: max(0.5rem, env(safe-area-inset-top));
        z-index: 9999 !important;
        background-color: rgba(255, 255, 255, 0.85) !important;
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }

    [data-theme="dark"] .navbar {
        background-color: rgba(15, 23, 42, 0.85) !important;
    }

    body {
        padding-top: 60px !important;
        padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px)) !important;
    }

    .navbar-collapse {
        display: none !important;
    }

    .navbar-toggler {
        display: none !important;
    }

    /* PWA: Touch-friendly targets (48px minimum) */
    .btn {
        min-height: 48px;
        min-width: 48px;
        padding: 0.75rem 1.25rem;
    }

    .btn-sm {
        min-height: 40px;
    }

    .nav-link,
    .list-group-item,
    .dropdown-item {
        min-height: 48px;
        display: flex;
        align-items: center;
    }

    /* PWA: Better card spacing on mobile */
    .card {
        border-radius: var(--radius-lg);
    }

    .card-body {
        padding: 1rem;
    }

    /* PWA: Stat cards grid on mobile - 2 columns */
    .stat-card {
        min-height: auto;
    }

    /* PWA: Icon boxes smaller on mobile */
    .icon-box {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }

    /* PWA: Compact leaderboard on mobile */
    .list-group-item {
        padding: 0.75rem 1rem;
    }

    /* PWA: Audio player compact mode */
    .audio-player-custom {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .audio-player-custom .volume-control {
        display: none;
        /* Hide volume on mobile - use device controls */
    }

    /* PWA: Full-width modals on mobile */
    .modal-dialog {
        margin: 0.5rem;
        max-width: calc(100% - 1rem);
    }

    /* PWA: Better hero section */
    .hero-bg-pattern {
        padding: 1rem 0;
    }

    .display-6 {
        font-size: 1.5rem;
    }

    /* PWA: Study mode cards stacking */
    .study-mode-card {
        margin-bottom: 1rem;
    }

    /* PWA: Chatbot widget positioning for mobile */
    .chatbot-widget {
        bottom: calc(100px + env(safe-area-inset-bottom)) !important;
        right: 12px !important;
    }

    .chatbot-toggle-btn {
        width: 52px;
        height: 52px;
    }
}

/* PWA: Small phones (320px) */
@media (max-width: 375px) {
    .container-fluid {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    .navbar-brand {
        font-size: 0.85rem;
        flex: 0 1 auto !important;
        margin-right: 1rem;
    }

    .display-6 {
        font-size: 1.25rem;
    }

    .icon-box {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    /* Leaderboard avatar smaller */
    .list-group-item .rounded-circle {
        width: 32px !important;
        height: 32px !important;
        font-size: 0.8rem !important;
    }
}

/* PWA: Reduced motion support */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .card:hover {
        transform: none;
    }
}

/* PWA: Safe area insets for bottom nav */
.bottom-nav {
    padding-bottom: env(safe-area-inset-bottom);
}

/* Compatibility Aliases for Base Layout */
:root {
    --bg-primary: var(--bg-body);
    --bg-card: var(--bg-surface);
    --text-primary: var(--text-main);
    --navbar-text: var(--text-secondary);
    --border-color: var(--border-subtle);
    --input-bg: var(--bg-surface);
    --input-border: var(--border-medium);
}

[data-theme="dark"] {
    --bg-primary: var(--bg-body);
    --bg-card: var(--bg-surface);
    --text-primary: var(--text-main);
    --navbar-text: var(--text-main);
    --border-color: var(--border-subtle);
}

/* Vibrancy Upgrade */
/* 1. Gradient Text */
.text-gradient-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* 2. Hero Background Pattern */
.hero-bg-pattern {
    position: relative;
    z-index: 1;
}

.hero-bg-pattern::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 120%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.008) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

[data-theme="dark"] .hero-bg-pattern::before {
    background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 60%);
}

/* Mobile: Remove vignette to maximize screen space */
@media (max-width: 768px) {
    .hero-bg-pattern::before {
        display: none !important;
        opacity: 0 !important;
        visibility: hidden !important;
    }

    [data-theme="dark"] .hero-bg-pattern::before {
        display: none !important;
        opacity: 0 !important;
        visibility: hidden !important;
    }
}

/* 3. Stat Card Accents */
.stat-card {
    border-top-width: 4px;
    border-top-style: solid;
    border-top-color: transparent;
    /* Default */
}

.stat-card-orange {
    border-top-color: #ea580c;
}

.stat-card-blue {
    border-top-color: #2563eb;
}

.stat-card-red {
    border-top-color: #ef4444;
}

.stat-card-indigo {
    border-top-color: #6366f1;
}

.stat-card-green {
    border-top-color: #16a34a;
}

/* 4. Enhanced Icons */
.icon-box {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* 5. Hover Effects */
.card {
    transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.card:hover {
    /* Removed transform to prevent duplicate scrollbar */
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
}

[data-theme="dark"] .card:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

/* =====================================================
   Recent Activity & Leaderboard Enhanced Styles
   ===================================================== */

/* Recent Activity List Items */
.list-group-item {
    background-color: var(--bg-surface);
    border-color: var(--border-subtle);
    transition: background-color 0.15s ease;
}

.list-group-item:hover {
    background-color: var(--bg-subtle);
}

[data-theme="dark"] .list-group-item {
    background-color: var(--bg-surface);
    border-color: var(--border-subtle);
}

[data-theme="dark"] .list-group-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
}

/* Timeline Icon */
.timeline-icon {
    width: 40px;
    height: 40px;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

[data-theme="dark"] .timeline-icon {
    background-color: rgba(37, 99, 235, 0.2);
    color: #60a5fa;
}

/* Audio Player Custom */
.audio-player-custom {
    background-color: var(--bg-subtle) !important;
    border-color: var(--border-subtle) !important;
}

[data-theme="dark"] .audio-player-custom {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}

/* Leaderboard Tabs */
.nav-pills .nav-link {
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-pills .nav-link.active {
    background-color: var(--primary);
    color: white;
}

.nav-pills .nav-link:not(.active):hover {
    background-color: var(--bg-subtle);
}

[data-theme="dark"] .nav-pills .nav-link:not(.active) {
    color: var(--text-muted);
}

[data-theme="dark"] .nav-pills .nav-link:not(.active):hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Leaderboard User Items */
.leaderboard-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-subtle);
    transition: background-color 0.15s ease;
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.leaderboard-item:hover {
    background-color: var(--bg-subtle);
}

[data-theme="dark"] .leaderboard-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
}

/* User Avatar in Leaderboard */
.leaderboard-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

/* Badge Counts */
.badge-count {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.75rem;
}

[data-theme="dark"] .badge-count {
    background-color: rgba(96, 165, 250, 0.15);
    color: #60a5fa;
}

/* =====================================================
   Leaderboard Dark Mode Enhancements
   ===================================================== */

/* Text visibility in dark mode */
[data-theme="dark"] .text-body {
    color: #f8fafc !important;
}

[data-theme="dark"] .text-muted {
    color: #94a3b8 !important;
}

/* Nav Pills in dark mode */
[data-theme="dark"] .nav-pills .nav-link {
    color: #94a3b8;
}

[data-theme="dark"] .nav-pills .nav-link.active {
    background-color: #2563eb;
    color: white;
}

[data-theme="dark"] .nav-pills .nav-link:not(.active):hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: #f8fafc;
}

/* List group items in leaderboard */
[data-theme="dark"] .list-group-item {
    background-color: transparent;
    border-color: #1e293b;
}

[data-theme="dark"] .list-group-flush .list-group-item {
    border-color: #1e293b;
}

/* Rank numbers */
[data-theme="dark"] .list-group-item .text-muted.small {
    color: #64748b !important;
}

/* Username text */
[data-theme="dark"] .list-group-item small.text-muted {
    color: #64748b !important;
}

/* Badge styling in dark mode */
[data-theme="dark"] .badge {
    font-weight: 600;
}

/* Orange badge (streaks) */
[data-theme="dark"] .badge[style*="rgba(249, 115, 22"] {
    background-color: rgba(249, 115, 22, 0.2) !important;
    color: #fb923c !important;
}

/* Green badge (activity) */
[data-theme="dark"] .badge[style*="rgba(34, 197, 94"] {
    background-color: rgba(34, 197, 94, 0.2) !important;
    color: #4ade80 !important;
}

/* Tab icon colors */
[data-theme="dark"] .nav-link .text-orange,
[data-theme="dark"] .nav-link i.text-orange {
    color: #fb923c !important;
}

/* Card backgrounds */
[data-theme="dark"] .card {
    background-color: #0f172a;
    border-color: #1e293b;
}

[data-theme="dark"] .card-header {
    background-color: transparent;
    border-color: #1e293b;
}

/* Question Bank Specific Contrast Fixes */
[data-theme="dark"] .table {
    color: var(--text-main);
}

[data-theme="dark"] .table tbody td {
    color: var(--text-main);
}

[data-theme="dark"] .question-content-text {
    color: var(--text-main) !important;
    font-weight: 400;
}

[data-theme="dark"] .text-muted {
    color: var(--text-secondary) !important;
}

/* Sidebar / Offcanvas Dark Mode Fixes */
[data-theme="dark"] .offcanvas {
    background-color: #0d1117 !important;
}

[data-theme="dark"] .offcanvas-body .nav-link {
    color: #e6edf3 !important;
    background-color: transparent;
}

[data-theme="dark"] .offcanvas-body .nav-link:hover {
    background-color: #161b22 !important;
}

[data-theme="dark"] .offcanvas-body .nav-link.active {
    background-color: #2563eb !important;
    color: #ffffff !important;
    font-weight: 600 !important;
}

[data-theme="dark"] .offcanvas-body .nav-link i {
    color: #8d96a0 !important;
}

[data-theme="dark"] .offcanvas-body .nav-link.active i {
    color: #ffffff !important;
}