@import url('https://fonts.googleapis.com/css2?family=Urbanist:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --bg-primary: #090b15;
    --bg-dark: #0d0e1c;
    --bg-secondary: #0f111f;
    --bg-light: #1e212f;
    --bg-card: #0f111f;
    --bg-hover: rgb(87, 78, 166, 0.1);
    --card-bg: hsla(0, 0%, 100%, .05);

    --text-primary: #667fff;
    --text-secondary: #959cdb;
    --text-muted: #645f7c;

    --primary: #5952da;
    --primary-hover: #818cf8;
    --secondary: #433db8;
    --accent: #8b5cf6;
    --warning: #f59e0b;
    --error: #ef4444;
    --success: #10b981;

    --border-color: hsla(0, 0%, 100%, .1);
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(131, 118, 252, 0.2);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, .1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, .1);
    --shadow-primary: 0 4px 15px rgba(88, 101, 242, .3);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: .15s ease;
    --transition-normal: .3s ease;
    --transition-slow: .5s ease;

    --spacing-xs: .25rem;
    --spacing-sm: .5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    --font-family: "Urbanist", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --font-size-xs: .75rem;
    --font-size-sm: .875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    --radius-sm: .5rem;
    --radius-md: .75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: rgba(131, 118, 252, 0.1);

    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;

    --border-primary: rgba(0, 0, 0, 0.1);
    --border-secondary: rgba(131, 118, 252, 0.2);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.page-container {
    min-height: 100vh;
    width: 100%;
    position: relative;
}

.section-container {
    margin: 0 auto;
    max-width: 1480px;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

section {
    position: relative;
}

.section-header {
    margin-bottom: var(--spacing-4xl);
    text-align: center;
}

.section-tag {
    background-color: rgba(88, 101, 242, 0.1);
    border: 1px solid rgba(88, 101, 242, 0.3);
    border-radius: var(--radius-full);
    color: var(--primary);
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
}

.section-title {
    background: linear-gradient(180deg, #fff, #bababa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-xl);
}

.section-subtitle,
.section-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0 auto;
    max-width: 600px;
}

@media (max-width: 768px) {
    .section-container {
        padding: 0 var(--spacing-lg);
    }

    .section-title {
        font-size: var(--font-size-4xl);
    }
}

@media (max-width: 640px) {
    .section-container {
        padding: var(--spacing-md);
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }
}

.main-app {
    display: none;
    min-height: 100vh;
}

.main-app.active {
    display: block;
}

.navbar {
    position: fixed;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgb(255, 255, 255, 0.03);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 0.5px solid rgb(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    padding: 6px 8px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

[data-theme="light"] .nav-container {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 3px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 15px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    cursor: pointer;
}

.nav-link i {
    font-size: 16px;
}

.nav-link:hover {
    background: rgba(88, 101, 242, 0.1);
    color: var(--text-primary);
}

.nav-link.active {
    background: rgba(88, 101, 242, 0.15);
    color: var(--primary);
}

.theme-toggle,
.notification-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.theme-toggle:hover,
.notification-btn:hover {
    background: var(--bg-hover);
    color: var(--primary);
}

.notification-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 16px;
    height: 16px;
    background: var(--error);
    color: white;
    border-radius: 50%;
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px 4px 4px;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.user-profile:hover {
    background: var(--bg-hover);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.sidebar {
    position: fixed;
    top: 72px;
    left: 0;
    width: 280px;
    height: calc(100vh - 72px);
    background: var(--bg-card);
    border-right: 1px solid var(--border-primary);
    z-index: 900;
    transform: translateX(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar.collapsed {
    transform: translateX(-224px);
    width: 56px;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-primary);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-logo i {
    color: var(--primary);
    font-size: 20px;
}

.sidebar.collapsed .sidebar-logo span {
    display: none;
}

.sidebar-content {
    flex: 1;
    padding: 16px 0;
}

.sidebar-section {
    margin-bottom: 32px;
}

.sidebar-section-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    padding: 0 24px;
}

.sidebar.collapsed .sidebar-section-title {
    display: none;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-item {
    margin-bottom: 4px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.sidebar-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar-item.active .sidebar-link {
    background: var(--bg-hover);
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.sidebar-link i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.sidebar.collapsed .sidebar-link span {
    display: none;
}

.sidebar-badge {
    background: var(--primary);
    color: white;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    margin-left: auto;
}

.sidebar.collapsed .sidebar-badge {
    display: none;
}

.main-content {
    min-height: 100vh;
}

.page {
    display: none;
    min-height: calc(100vh - 72px);
    padding-top: 120px;
}

.page.active {
    display: block;
    animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero {
    margin-top: -120px;
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
    background: var(--bg-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(90deg, rgba(88, 101, 242, 0.08) 1px, transparent 1px),
        linear-gradient(rgba(88, 101, 242, 0.08) 1px, transparent 1px);
    background-size: 80px 80px;
    pointer-events: none;
    z-index: 0;
}

.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(88, 101, 242, 0.12) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
    width: 100%;
    margin-top: 25px;
}


.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(88, 101, 242, 0.1);
    border: 1px solid rgba(88, 101, 242, 0.3);
    color: #6f6dee;
    padding: 8px 15px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 450;
    margin-bottom: 8px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary), #8b7dff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight {
    color: var(--primary);
}


.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-4xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.features {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.feature-card:hover::before {
    transform: translateX(100%);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 16px;
    margin: 0 auto 24px;
    color: white;
    font-size: 24px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #7c6fff);
    color: white;
    box-shadow: 0 4px 15px rgba(88, 101, 242, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(88, 101, 242, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(88, 101, 242, 0.1);
    border-color: var(--primary);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

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

.btn-large {
    padding: 16px 36px;
    font-size: 1rem;
}

.grade-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    background: var(--bg-card);
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--border-primary);
    max-width: max-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.tab-btn.active {
    background: var(--primary);
    color: white;
}

.tab-btn:hover:not(.active) {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.grade-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.grade-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition);
}

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

.grade-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.grade-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    color: white;
    font-size: 20px;
}

.grade-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.grade-count {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg-hover);
    padding: 4px 8px;
    border-radius: 12px;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.subject-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    background: var(--bg-hover);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition-fast);
}

.subject-item:hover {
    background: rgba(131, 118, 252, 0.2);
}

.subject-item i {
    color: var(--primary);
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.subject-item span:first-of-type {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
}

.subject-count {
    background: var(--primary);
    color: white;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 8px;
}

.grade-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.grade-actions .btn {
    flex: 1;
    justify-content: center;
}

.volume-section {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-primary);
    margin-bottom: 12px;
}

.volume-section:first-of-type {
    border-top: none;
    margin-top: 16px;
    margin-bottom: 12px;
}

.volume-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.volume-title::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--primary);
    border-radius: 2px;
}

.books-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.book-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 14px;
    font-weight: 500;
}

.book-item:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.book-item i:first-child {
    color: var(--error);
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.book-item i:last-child {
    color: var(--text-muted);
    font-size: 12px;
    margin-left: auto;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.book-item:hover i:last-child {
    opacity: 1;
    color: var(--primary);
}

.stats-section {
    padding: 80px 0;
    background: var(--bg-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition);
}

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

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    color: white;
    font-size: 24px;
}

.stat-info {
    flex: 1;
}

.stat-card .stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-state i {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.empty-state h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.page-header {
    padding: 40px 0 60px;
    text-align: center;
    border-bottom: 1px solid var(--border-primary);
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.page-header p {
    color: var(--text-secondary);
    font-size: 16px;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 800;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    .sidebar.open .sidebar-link span,
    .sidebar.open .sidebar-section-title,
    .sidebar.open .sidebar-badge {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .main-content.sidebar-collapsed {
        margin-left: 0;
    }

    body.sidebar-open {
        overflow: hidden;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 16px;
    }

    .nav-center {
        margin: 0 16px;
        max-width: 200px;
    }

    .hero {
        margin-top: -120px;
        padding: 60px 0 80px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        justify-content: center;
    }

    .hero-stats {
        gap: 32px;
    }

    .features {
        padding: 80px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .grade-tabs {
        flex-direction: column;
        width: 100%;
    }

    .subjects-grid {
        grid-template-columns: 1fr;
    }

    .grade-actions {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .user-name {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .nav-center {
        display: none;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .features {
        padding: 60px 0;
    }

    .stats-section {
        padding: 60px 0;
    }

    .stat-card {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
}

@media (prefers-reduced-motion: reduce) {

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

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 72px);
    padding-top: 120px;
    padding: 40px 0;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    padding: 48px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, var(--primary), transparent);
    animation: rotate 4s linear infinite;
    z-index: -1;
    opacity: 0.1;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px;
    margin: 0 auto 24px;
    color: white;
    font-size: 32px;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.login-header h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.login-header p {
    color: var(--text-secondary);
    font-size: 16px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.input-container i:first-child {
    position: absolute;
    left: 16px;
    color: var(--text-muted);
    font-size: 16px;
    z-index: 2;
}

.input-container input {
    width: 100%;
    height: 48px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 12px;
    padding: 0 48px;
    color: var(--text-primary);
    font-size: 16px;
    transition: var(--transition);
}

.input-container input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-card);
    box-shadow: 0 0 0 3px rgba(131, 118, 252, 0.1);
}

.input-container input::placeholder {
    color: var(--text-muted);
}

.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    z-index: 3;
}

.password-toggle:hover {
    color: var(--primary);
    background: var(--bg-hover);
}

.password-toggle i {
    font-size: 14px;
}

.login-btn {
    margin-top: 16px;
    height: 48px;
    font-size: 16px;
    position: relative;
    overflow: hidden;
    justify-content: center;
}

.login-btn.loading {
    pointer-events: none;
}

.login-btn.loading span {
    opacity: 0;
}

.login-btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 40px 0 32px;
    border-bottom: 1px solid var(--border-primary);
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

.welcome-section h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.welcome-section h1 span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.school-info {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
    padding: 8px 12px;
    background: var(--bg-hover);
    border-radius: 8px;
    max-width: fit-content;
}

.school-info i.fa-school {
    color: var(--primary);
    font-size: 16px;
}

.school-name {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.school-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: var(--transition-fast);
}

.school-toggle:hover {
    background: var(--bg-hover);
    color: var(--primary);
}

.school-toggle i {
    font-size: 12px;
}

.welcome-section p {
    color: var(--text-secondary);
    font-size: 16px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 40px;
}

.dashboard-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    padding: 24px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dashboard-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.dashboard-card:hover::before {
    transform: scaleX(1);
}

.dashboard-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    color: white;
    font-size: 20px;
}

.card-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.profile-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: var(--transition-fast);
    gap: 12px;
    flex-wrap: wrap;
}

.info-item:hover {
    background: var(--bg-hover);
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 14px;
}

.info-value {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
    word-wrap: break-word;
    word-break: break-all;
    overflow-wrap: break-word;
    max-width: 100%;
    line-height: 1.4;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px;
    background: none;
    border-radius: 12px;
    transition: var(--transition-fast);
}

.stat-item:hover {
    transform: translateY(-2px);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(131, 118, 252, 0.1);
    border-radius: 10px;
    color: var(--primary);
    font-size: 18px;
}

.stat-info {
    text-align: center;
}

.stat-item .stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    display: block;
    margin-bottom: 4px;
}

.stat-item .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.activities-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: var(--transition-fast);
}

.activity-item:hover {
    background: var(--bg-hover);
    transform: translateX(4px);
}

.activity-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: rgba(131, 118, 252, 0.1);
    border-radius: 8px;
    color: var(--primary);
    font-size: 14px;
}

.activity-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.activity-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.activity-time {
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 768px) {

    .login-card {
        padding: 32px 24px;
        margin: 0 16px;
    }

    .dashboard-card a.btn {
        display: block;
        width: 100%;
        margin-bottom: 10px;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 24px 16px;
    }

    .login-header h2 {
        font-size: 24px;
    }

    .welcome-section h1 {
        font-size: 24px;
    }

    .info-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .info-value {
        font-size: 13px;
        width: 100%;
    }
}

.donation-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

.donation-modal.active {
    opacity: 1;
    visibility: visible;
}

.donation-modal-content {
    background: var(--bg-secondary);
    border: 1px solid rgba(88, 101, 242, 0.3);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 440px;
    position: relative;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.donation-modal.active .donation-modal-content {
    transform: scale(1) translateY(0);
}

.donation-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    z-index: 2;
}

.donation-close:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.donation-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), #7c6fff);
    border-radius: 12px;
    margin: 0 auto 24px;
    color: white;
    font-size: 28px;
}

.donation-header {
    text-align: center;
    margin-bottom: 28px;
}

.donation-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
}

.donation-header h2 .highlight {
    background: linear-gradient(135deg, var(--primary), #8b7dff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.donation-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.donation-card {
    background: rgba(88, 101, 242, 0.08);
    border: 1px solid rgba(88, 101, 242, 0.2);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.donation-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.donation-card-header i {
    color: #ff6b6b;
    font-size: 20px;
}

.donation-card-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: 8px;
}

.donation-loading {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    font-style: italic;
}

.donation-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 16px 32px;
    background: #1a1d2e;
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: var(--transition-fast);
}

.donation-btn:hover {
    transform: translateY(-2px);
}

.donation-btn i {
    font-size: 18px;
    color: #ff6b6b;
}

@media (max-width: 768px) {
    .donation-modal-content {
        padding: 40px 28px;
    }

    .donation-header h2 {
        font-size: var(--font-size-2xl);
    }

    .donation-icon {
        width: 56px;
        height: 56px;
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .donation-modal-content {
        padding: 24px 20px;
    }

    .donation-header h2 {
        font-size: 20px;
    }

    .donation-header p {
        font-size: 14px;
    }

    .donation-btn {
        padding: 14px 24px;
        font-size: 14px;
    }
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    min-height: 400px;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-primary);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: loadingSpin 1s linear infinite;
    margin-bottom: 24px;
}

.loading-text {
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    animation: loadingPulse 1.5s ease-in-out infinite;
}

@keyframes loadingSpin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes loadingPulse {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .loading-container {
        padding: 60px 20px;
        min-height: 300px;
    }

    .loading-spinner {
        width: 48px;
        height: 48px;
        border-width: 3px;
        margin-bottom: 20px;
    }

    .loading-text {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .loading-container {
        padding: 40px 16px;
        min-height: 250px;
    }

    .loading-spinner {
        width: 40px;
        height: 40px;
        border-width: 3px;
        margin-bottom: 16px;
    }

    .loading-text {
        font-size: 13px;
    }
}

.hero-stats {
    display: none !important;
}

.hero-actions {
    margin-bottom: 0 !important;
}

.features::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1200px;
    height: 300px;
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
}

.features {
    position: relative;
}

.hero-subtitle {
    color: #9ca3bd !important;
}

.btn-large {
    padding: 14px 28px !important;
    font-size: 0.95rem !important;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(1.8rem, 5vw, 2.5rem) !important;
    }

    .hero-subtitle {
        font-size: 0.9rem !important;
    }

    .btn-large {
        padding: 12px 24px !important;
        font-size: 0.9rem !important;
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }

    50% {
        opacity: 1;
        transform: scale(1.05);
    }

    70% {
        transform: scale(0.9);
    }

    100% {
        transform: scale(1);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

.grade-card {
    animation: fadeInUp 0.5s ease-out;
    animation-fill-mode: both;
}

.grade-card:nth-child(1) {
    animation-delay: 0.1s;
}

.grade-card:nth-child(2) {
    animation-delay: 0.2s;
}

.grade-card:nth-child(3) {
    animation-delay: 0.3s;
}

.grade-card:nth-child(4) {
    animation-delay: 0.4s;
}

.grade-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 10px 20px rgba(88, 101, 242, 0.3);
    border-color: var(--primary);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.grade-card:nth-child(1) .grade-icon {
    animation-delay: 0.2s;
}

.grade-card:nth-child(2) .grade-icon {
    animation-delay: 0.3s;
}

.grade-card:nth-child(3) .grade-icon {
    animation-delay: 0.4s;
}

.grade-card:nth-child(4) .grade-icon {
    animation-delay: 0.5s;
}

.btn-primary,
.btn-secondary {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-primary::before,
.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before,
.btn-secondary:hover::before {
    left: 100%;
}

.btn-primary:hover,
.btn-secondary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 30px rgba(88, 101, 242, 0.4);
}

.book-item {
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.book-item:hover {
    transform: translateX(5px) scale(1.03);
    background: rgba(88, 101, 242, 0.15);
    border-left: 3px solid var(--primary);
    padding-left: 9px;
}

.tab-btn {
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.tab-btn:hover:not(.active) {
    transform: translateY(-2px);
}

.tab-btn.active {
    animation: fadeIn 0.3s ease-out;
}

.feature-card {
    animation: fadeInUp 0.2s ease-out;
}

.donation-modal.active .donation-modal-content {
    animation: fadeInUp 0.6s ease-out;
}


@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.nav-link {
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.hero-actions .btn {
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.hero-actions .btn:nth-child(1) {
    animation-delay: 0.4s;
}

.hero-actions .btn:nth-child(2) {
    animation-delay: 0.5s;
}

.hero-title {
    background: linear-gradient(90deg, #e1eefe);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    animation-delay: 0.2s;
    animation-fill-mode: both;
}