:root {
    /* Base Colors - Light Theme Default */
    --primary-color: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --secondary-color: #64748b;
    --accent-color: #f43f5e;

    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #1e1b4b;
    --bg-header: #ffffff;

    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #e2e8f0;

    --border-color: #e2e8f0;
    --nav-icon-color: #64748b;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    --sidebar-width: 260px;
    --header-height: 64px;

    --transition-fast: 0.2s ease;
}

[data-theme="dark"] {
    --bg-body: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --bg-sidebar: #020617;
    /* Slate 950 */
    --bg-header: #1e293b;

    --text-main: #f1f5f9;
    /* Slate 100 */
    --text-muted: #94a3b8;
    /* Slate 400 */
    --text-light: #cbd5e1;
    /* Slate 300 - was too dark */

    --border-color: #334155;
    --nav-icon-color: #94a3b8;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

.text-white-50 {
    color: rgba(255, 255, 255, 0.5) !important;
}

[data-theme="dark"] .text-white-50 {
    color: rgba(255, 255, 255, 0.3) !important;
}

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

[data-theme="dark"] .text-dark {
    color: #f1f5f9 !important;
    /* Slate 100 */
}

[data-theme="dark"] .text-muted {
    color: #94a3b8 !important;
    /* Slate 400 */
}

[data-theme="dark"] .text-secondary {
    color: #cbd5e1 !important;
    /* Slate 300 */
}

[data-theme="dark"] .text-body {
    color: #e2e8f0 !important;
    /* Slate 200 */
}

[data-theme="dark"] .lead {
    color: #cbd5e1 !important;
}

[data-theme="dark"] .form-label {
    color: #f1f5f9 !important;
}

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

[data-theme="dark"] .navbar-light .navbar-nav .nav-link {
    color: var(--text-main);
}

[data-theme="dark"] .main-navbar {
    background-color: var(--bg-header) !important;
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .active-subject-badge {
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .cards-container,
[data-theme="dark"] .bg-white,
[data-theme="dark"] section.bg-white {
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .bg-light,
[data-theme="dark"] section.bg-light {
    background-color: var(--bg-body) !important;
}

[data-theme="dark"] .category-card {
    background-color: rgba(255, 255, 255, 0.03) !important;
    border-color: rgba(255, 255, 255, 0.05) !important;
}

[data-theme="dark"] .category-card:hover {
    background-color: rgba(255, 255, 255, 0.05) !important;
}

[data-theme="dark"] #menu-toggle {
    color: var(--text-main) !important;
}

[data-theme="dark"] .login-card,
[data-theme="dark"] .signup-card {
    background-color: var(--bg-card) !important;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] .login-right,
[data-theme="dark"] .signup-left {
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .input-group-premium input,
[data-theme="dark"] .input-wrapper input {
    background-color: #0f172a !important;
    /* Slate 900 */
    border-color: #334155 !important;
    /* Slate 700 */
    color: #f1f5f9 !important;
}

[data-theme="dark"] .glass-card {
    background: rgba(30, 41, 59, 0.8) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .list-group-item-sidebar {
    color: rgba(255, 255, 255, 0.6) !important;
}

[data-theme="dark"] .list-group-item-sidebar.active {
    background-color: rgba(79, 70, 229, 0.2) !important;
    color: #fff !important;
}

[data-theme="dark"] .bg-dark {
    background-color: #020617 !important;
    /* Slate 950 */
}

[data-theme="dark"] .modal-content {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .modal-header {
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .form-control {
    background-color: #0f172a !important;
    border-color: #334155 !important;
    color: #f1f5f9 !important;
}

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

[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(255, 255, 255, 0.02) !important;
}

[data-theme="dark"] .card {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    color: var(--text-main);
}

/* --- Layout Structure --- */
#wrapper {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* Sidebar */
#sidebar-wrapper {
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    color: var(--text-light);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.sidebar-heading {
    padding: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    height: var(--header-height);
}

.list-group-item-sidebar {
    background-color: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: none;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    transition: all var(--transition-fast);
}

.list-group-item-sidebar i {
    width: 24px;
    text-align: center;
    margin-right: 12px;
}

.list-group-item-sidebar:hover,
.list-group-item-sidebar.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-left: 4px solid var(--primary-light);
}

/* Page Content */
#page-content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Top Navbar */
.main-navbar {
    height: var(--header-height);
    background-color: var(--bg-card);
    box-shadow: var(--shadow-sm);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
}

/* --- Components --- */

/* Cards */
.card {
    background-color: var(--bg-card);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    /* Only hover effect on actionable cards if desired, but general subtle lift looks good */
    box-shadow: var(--shadow-md);
}

.card-.hover-scale:hover {
    transform: scale(1.05);
}

/* --- Utility Classes for Landing Page --- */
.text-indigo-400 {
    color: #818cf8 !important;
}

.text-indigo-500 {
    color: #6366f1 !important;
}

.text-indigo-600 {
    color: #4f46e5 !important;
}

.bg-indigo-100 {
    background-color: #e0e7ff !important;
}

.bg-indigo-500 {
    background-color: #6366f1 !important;
}

.bg-indigo-600 {
    background-color: #4f46e5 !important;
}

.btn-indigo-600 {
    background-color: #4f46e5 !important;
    color: white !important;
    transition: all 0.3s ease;
}

.btn-indigo-600:hover {
    background-color: #4338ca !important;
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

.bg-indigo-500-10 {
    background-color: rgba(99, 102, 241, 0.1) !important;
}

.shadow-indigo-500\/50 {
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.5) !important;
}

.shadow-2xl {
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25) !important;
}

/* Custom Animation Handlers */
.animate__animated {
    animation-duration: 1s;
    animation-fill-mode: both;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translate3d(-50px, 0, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate__fadeInLeft {
    animation-name: fadeInLeft;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 50px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate__fadeInUp {
    animation-name: fadeInUp;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translate3d(50px, 0, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate__fadeInRight {
    animation-name: fadeInRight;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translate3d(0, -30px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate__fadeInDown {
    animation-name: fadeInDown;
}

.animate__delay-1s {
    animation-delay: 0.5s;
}

.animate__delay-2s {
    animation-delay: 1s;
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

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

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

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

/* Stats Cards Specifics */
.stat-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.25rem;
}

/* Tables */
.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: #f1f5f9;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: none;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.table tbody td {
    vertical-align: middle;
    padding-top: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #f1f5f9;
}

/* Footer */
footer {
    background-color: white;
    padding: 1.5rem;
    margin-top: auto;
    border-top: 1px solid #e2e8f0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Mobile Toggle */
#menu-toggle {
    cursor: pointer;
}

@media (max-width: 768px) {
    #sidebar-wrapper {
        margin-left: calc(-1 * var(--sidebar-width));
    }

    #wrapper.toggled #sidebar-wrapper {
        margin-left: 0;
    }
}

/* --- Glassmorphism & Premium Utilities (Global) --- */

.glass-panel {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

.glass-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

/* Gradients */
.bg-gradient-primary {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

.bg-gradient-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.bg-gradient-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.bg-gradient-info {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.bg-gradient-royal {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
}

/* Card Improvements */
.premium-card {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    border-radius: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.premium-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity 0.3s;
}

.premium-card:hover {
    transform: translateY(-5px);
    background: #ffffff;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.premium-card:hover::before {
    opacity: 1;
}

/* Sidebar Customization */
.sidebar-glass {
    background: rgba(30, 27, 75, 0.95);
    backdrop-filter: blur(10px);
}

/* Badges */
.badge-glass {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
}

/* Desktop Sidebar Toggle Logic */
@media (min-width: 769px) {
    #wrapper.toggled #sidebar-wrapper {
        margin-left: calc(-1 * var(--sidebar-width));
    }
}
/* =========================================
   Redesigned Header Styles
   ========================================= */

.header-glass {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
    height: 70px;
}

[data-theme='dark'] .header-glass {
    background: rgba(30, 41, 59, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
}

.header-btn i {
    font-size: 1rem;
}

.header-btn:active {
    transform: scale(0.98);
}

.header-btn-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.header-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(79, 70, 229, 0.4);
    color: white;
}

.header-btn-secondary {
    background: white;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

[data-theme='dark'] .header-btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.header-btn-secondary:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

[data-theme='dark'] .header-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.header-btn-ghost {
    background: transparent;
    color: var(--text-muted);
}

.header-btn-ghost:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--primary-color);
}

[data-theme='dark'] .header-btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--primary-light);
}

.header-divider {
    height: 24px;
    width: 1px;
    background-color: var(--border-color);
    margin: 0 12px;
}

.header-clock {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    letter-spacing: 0.5px;
    background: rgba(241, 245, 249, 0.5);
    padding: 6px 12px;
    border-radius: 9999px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--text-main);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

[data-theme='dark'] .header-clock {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.active-subject-badge-new {
    background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
    color: white;
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 6px -1px rgba(234, 88, 12, 0.3);
    border: 1px solid rgba(255,255,255,0.2);
    cursor: pointer;
    transition: all 0.2s;
}

.active-subject-badge-new:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 8px -1px rgba(234, 88, 12, 0.4);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: white;
    border-radius: 50%;
    animation: pulse-dot 1.5s infinite;
}

@keyframes pulse-dot {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7); }
    70% { box-shadow: 0 0 0 6px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

.nav-user-dropdown {
    padding: 4px 12px;
    border-radius: 9999px;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.nav-user-dropdown:hover, .nav-user-dropdown[aria-expanded='true'] {
    background: rgba(0,0,0,0.03);
    border-color: var(--border-color);
}

[data-theme='dark'] .nav-user-dropdown:hover, [data-theme='dark'] .nav-user-dropdown[aria-expanded='true'] {
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,255,255,0.1);
}