:root {
    /* Brand Colors: Vibrant Indigo / Purple theme */
    --brand-primary: #4f46e5;
    --brand-primary-hover: #4338ca;
    --brand-secondary: #0ea5e9;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-blur: blur(12px);

    color-scheme: light dark;
}

[data-bs-theme="dark"] {
    --bg-color: #0b0f19;
    --surface-color: #151b2c;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #222a3e;

    /* Glassmorphism */
    --glass-bg: rgba(21, 27, 44, 0.85);
    --brand-primary: #6366f1;
    --brand-primary-hover: #4f46e5;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    /* Enough room so content clears the fixed mobile bottom nav (including iOS safe area) */
    padding-bottom: calc(3.5rem + env(safe-area-inset-bottom));
    min-height: 100vh;
}

@media (min-width: 768px) {
    body {
        padding-bottom: 0;
    }
}

/* Top App Bar Header */
.app-header {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1020;
    padding: 1rem 0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.header-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--brand-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Card / Container styles for a premium look */
.premium-card {
    background: var(--surface-color);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* Subtle interactive animations */
.interactive:active {
    transform: scale(0.97);
}

/* Bottom Mobile Navigation Shell */
.mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    z-index: 1030;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0.35rem 0;
    padding-top: 0.35rem;
    padding-bottom: calc(0.35rem + env(safe-area-inset-bottom));
    box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.03);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 500;
    padding: 0.3rem 0.5rem;
    border-radius: 10px;
    transition: all 0.2s ease;
    gap: 0.15rem;
}

.nav-item i {
    font-size: 1.1rem;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-item.active {
    color: var(--brand-primary);
}

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

/* Buttons overrides */
.btn-primary {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
    border-radius: 12px;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
    transition: all 0.2s;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--brand-primary-hover);
    border-color: var(--brand-primary-hover);
    transform: translateY(-1px);
}

/* Utility */
.gradient-text {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.non-gradient-text {
    color: var(--brand-primary);
}

/* Desktop: hide mobile nav */
@media (min-width: 768px) {
    .mobile-nav {
        display: none !important;
    }
}

/* Custom FEK Selectable Cards */
.fek-card {
    position: relative;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.165, 0.84, 0.44, 1);
    border: 1px solid var(--border-color) !important;
    background-color: var(--surface-color) !important;
    user-select: none;
}

.fek-card:hover {
    border-color: var(--brand-primary) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.fek-card:active {
    transform: translateY(1px) scale(0.97);
}

/* When the checkbox inside is checked */
.fek-card:has(input:checked) {
    background-color: rgba(79, 70, 229, 0.08) !important;
    border-color: var(--brand-primary) !important;
    color: var(--brand-primary) !important;
    border-width: 2px !important;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.12);
}

/* Style the checkbox itself with a margin and brand color */
.fek-card input[type="checkbox"] {
    margin-right: 10px;
    cursor: pointer;
    accent-color: var(--brand-primary);
}

/* Modern Rating Buttons Style */
.rating-btn-group .rate-btn, .rate-btn {
    border-radius: 12px;
    border-width: 2px !important;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.rating-btn-group .rate-btn:hover, .rate-btn:hover {
    transform: translateY(-2px) scale(1.05);
}

.rating-btn-group .rate-btn:active, .rate-btn:active {
    transform: translateY(1px) scale(0.95);
}

/* Glow effects for active states */
.rate-btn.btn-secondary {
    box-shadow: 0 4px 10px rgba(108, 117, 125, 0.3);
}

.rate-btn.btn-warning {
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.4);
}

.rate-btn.btn-info {
    box-shadow: 0 4px 12px rgba(13, 202, 240, 0.4);
    color: white !important;
}

.rate-btn.btn-success {
    box-shadow: 0 4px 12px rgba(25, 135, 84, 0.4);
}

.rate-btn.btn-primary {
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

/* FEK Filter Pills */
#fek-filter-container .btn {
    padding: 0.6rem 1.2rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

#fek-filter-container .btn:hover {
    transform: translateY(-1px);
}

/* Card hover animation */
.clickable-card {
    transition: transform 0.2s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.2s ease, border-color 0.2s ease;
}
.clickable-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 20px -3px rgba(0, 0, 0, 0.12), 0 4px 6px -4px rgba(0, 0, 0, 0.12) !important;
    border-color: var(--brand-primary) !important;
}

/* Grid fade-in animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
#students-grid {
    animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Dark mode styles for OpenStreetMap on Leaflet */
[data-bs-theme="dark"] .leaflet-container {
    filter: invert(100%) hue-rotate(180deg) brightness(95%) contrast(90%);
}

/* Ensure premium cards and components adapt correctly to dark mode */
.category-card, .category-card .accordion-button {
    background-color: var(--surface-color) !important;
    color: var(--text-main) !important;
}
.topic-row {
    background-color: var(--surface-color) !important;
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}
.focus-areas-dashboard {
    background-color: var(--surface-color) !important;
    border-color: var(--border-color) !important;
}
.focus-inner {
    background-color: var(--surface-color) !important;
    border-color: var(--border-color) !important;
}
[data-bs-theme="dark"] .focus-inner.bg-light {
    background-color: rgba(255, 255, 255, 0.03) !important;
    border-color: var(--border-color) !important;
}
[data-bs-theme="dark"] .bg-light {
    background-color: var(--surface-color) !important;
}
[data-bs-theme="dark"] .bg-body-secondary {
    background-color: #1a2236 !important;
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .modal-content {
    background-color: var(--surface-color) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--border-color) !important;
}
[data-bs-theme="dark"] .modal-header .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}
[data-bs-theme="dark"] input.form-control, 
[data-bs-theme="dark"] select.form-select,
[data-bs-theme="dark"] textarea.form-control {
    background-color: #1a2236 !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] input.form-control:focus, 
[data-bs-theme="dark"] select.form-select:focus,
[data-bs-theme="dark"] textarea.form-control:focus {
    border-color: var(--brand-primary) !important;
    box-shadow: 0 0 0 0.25rem rgba(99, 102, 241, 0.25) !important;
}
[data-bs-theme="dark"] .dropdown-menu {
    background-color: var(--surface-color) !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3) !important;
}
[data-bs-theme="dark"] .dropdown-item {
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.05) !important;
}
[data-bs-theme="dark"] .dropdown-divider {
    border-color: var(--border-color) !important;
}
[data-bs-theme="dark"] .table {
    color: var(--text-main) !important;
    --bs-table-bg: transparent !important;
    --bs-table-hover-bg: rgba(255, 255, 255, 0.03) !important;
}

/* Sticky mobile sub-header for student name (evaluate page) */
.sticky-student-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1019;
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    overflow: hidden;
    white-space: nowrap;
}

.sticky-student-bar.visible {
    transform: translateY(0);
    opacity: 1;
}

/* Custom transparent buttons for input groups */
.btn-transparent {
    background-color: transparent !important;
    border: 0;
    color: var(--text-muted) !important;
    transition: color 0.15s ease-in-out;
}
.btn-transparent:hover, .btn-transparent:focus {
    color: var(--brand-primary) !important;
}

/* Global border color overrides for dark mode utilities */
[data-bs-theme="dark"] .border,
[data-bs-theme="dark"] .border-start,
[data-bs-theme="dark"] .border-end,
[data-bs-theme="dark"] .border-top,
[data-bs-theme="dark"] .border-bottom,
[data-bs-theme="dark"] .dropdown-divider {
    border-color: var(--border-color) !important;
}

/* Automatically map bg-white utility class to dark surface color in dark mode (except QR Code) */
[data-bs-theme="dark"] .bg-white:not(#qrcode-container):not(#qrcode) {
    background-color: var(--surface-color) !important;
}

/* Override text color utilities in dark mode to ensure readable contrast */
[data-bs-theme="dark"] .text-dark {
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}
[data-bs-theme="dark"] .text-secondary {
    color: var(--text-muted) !important;
}

/* Dark mode overrides for settings / curriculum views and tables */
[data-bs-theme="dark"] .bg-indigo-subtle {
    background-color: rgba(99, 102, 241, 0.15) !important;
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .sortable-drag {
    background-color: var(--surface-color) !important;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5) !important;
}
[data-bs-theme="dark"] .btn-light {
    background-color: #21283d !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .btn-light:hover, [data-bs-theme="dark"] .btn-light:focus {
    background-color: #2b334d !important;
    color: var(--text-main) !important;
}
[data-bs-theme="dark"] .table-light {
    --bs-table-bg: #1a2236 !important;
    --bs-table-color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}