/* BrainBit Learning System - Modern CSS */
/* Designed for students aged 8-20 years */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Primary Colors - Vibrant & Engaging */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);

    /* Color Palette */
    --primary: #667eea;
    --primary-dark: #764ba2;
    --secondary: #10b981;
    --accent: #f59e0b;
    --success: #22c55e;
    --warning: #eab308;
    --danger: #ef4444;
    --info: #06b6d4;

    /* Neutral Colors */
    --dark: #1e293b;
    --dark-light: #334155;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --light: #f1f5f9;
    --white: #ffffff;

    /* Typography */
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --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;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.4);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ============================================
   Base Styles
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ee 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Animations
   ============================================ */
@keyframes float {

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

    50% {
        transform: translateY(-15px);
    }
}

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.4);
    }

    50% {
        box-shadow: 0 0 40px rgba(102, 126, 234, 0.8);
    }
}

@keyframes slide-up {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

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

@keyframes slide-in-left {
    from {
        transform: translateX(-100px);
        opacity: 0;
    }

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

@keyframes bounce-in {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }

    50% {
        transform: scale(1.05);
    }

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

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

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

    to {
        transform: rotate(360deg);
    }
}

.float-animation {
    animation: float 3s ease-in-out infinite;
}

.pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

.slide-up {
    animation: slide-up 0.6s ease-out;
}

.bounce-in {
    animation: bounce-in 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ============================================
   Layout Components
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.page-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: var(--space-8);
}

/* ============================================
   Header / Navigation
   ============================================ */
.learning-header {
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--space-4) var(--space-6);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

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

.learning-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 700;
    font-size: var(--font-size-xl);
}

.learning-logo img {
    height: 40px;
    width: 40px;
    border-radius: var(--radius-lg);
}

.learning-nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.learning-nav a {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.learning-nav a:hover,
.learning-nav a.active {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--space-16) var(--space-6);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before,
.hero-section::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    filter: blur(80px);
}

.hero-section::before {
    top: -100px;
    left: -100px;
}

.hero-section::after {
    bottom: -100px;
    right: -100px;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-icon {
    font-size: 5rem;
    margin-bottom: var(--space-4);
    animation: float 3s ease-in-out infinite;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    opacity: 0.9;
    margin-bottom: var(--space-8);
}

/* ============================================
   Course Cards Grid
   ============================================ */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-8);
    padding: var(--space-8) 0;
}

.course-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.course-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-2xl);
}

.course-card-header {
    padding: var(--space-6);
    color: var(--white);
    position: relative;
}

.course-card-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-3);
}

.course-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.course-card-body {
    padding: var(--space-6);
}

.course-card-description {
    color: var(--gray);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.course-card-meta {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--gray);
    background: var(--light);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
}

.course-meta-item i {
    color: var(--primary);
}

/* ============================================
   Sidebar (Course Dashboard)
   ============================================ */
.sidebar {
    width: 320px;
    background: var(--white);
    border-right: 1px solid var(--gray-light);
    height: calc(100vh - 70px);
    position: sticky;
    top: 70px;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-header {
    padding: var(--space-6);
    background: var(--primary-gradient);
    color: var(--white);
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.sidebar-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.lesson-list {
    padding: var(--space-4);
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-2);
    transition: var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.lesson-item:hover {
    background: var(--light);
    transform: translateX(5px);
}

.lesson-item.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-color: var(--primary);
}

.lesson-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.lesson-icon.video {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.lesson-icon.pdf {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.lesson-icon.audio {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
}

.lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-title {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xs);
    color: var(--gray);
}

.lesson-type-badge {
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
}

.lesson-type-badge.video {
    background: #fee2e2;
    color: #dc2626;
}

.lesson-type-badge.pdf {
    background: #dbeafe;
    color: #2563eb;
}

.lesson-type-badge.audio {
    background: #dcfce7;
    color: #16a34a;
}

/* ============================================
   Content Viewer Area
   ============================================ */
.content-viewer {
    flex: 1;
    padding: var(--space-8);
    max-width: 100%;
    overflow-x: hidden;
}

.content-header {
    margin-bottom: var(--space-6);
}

.content-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--space-2);
    color: var(--dark);
}

.content-description {
    color: var(--gray);
    font-size: var(--font-size-lg);
}

/* Video Player */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    /* 16:9 */
    background: var(--dark);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
}

.video-container video,
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* PDF Viewer */
.pdf-container {
    background: var(--white);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    height: calc(100vh - 250px);
    min-height: 600px;
}

.pdf-container iframe,
.pdf-container embed {
    width: 100%;
    height: 100%;
    border: none;
}

/* Audio Player */
.audio-container {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.audio-visual {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--space-6);
    background: var(--secondary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--white);
    animation: pulse-glow 2s ease-in-out infinite;
}

.audio-player {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.audio-player audio {
    width: 100%;
    height: 50px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    border: none;
    transition: var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-gradient);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

/* ============================================
   Admin Panel Styles
   ============================================ */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    color: var(--white);
    padding: var(--space-6);
}

.admin-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-6);
}

.admin-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.admin-nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-normal);
}

.admin-nav-link:hover,
.admin-nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.admin-nav-link i {
    width: 20px;
    text-align: center;
}

.admin-content {
    flex: 1;
    background: var(--light);
    padding: var(--space-8);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
}

.admin-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--dark);
}

/* Data Table */
.data-table {
    width: 100%;
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.data-table th,
.data-table td {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    border-bottom: 1px solid var(--gray-light);
}

.data-table th {
    background: var(--light);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table tr:hover {
    background: rgba(102, 126, 234, 0.05);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--dark);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-family: var(--font-primary);
    transition: var(--transition-normal);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Card Component */
.card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--gray-light);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.card-body {
    padding: var(--space-6);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.stat-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--dark);
}

.stat-info span {
    font-size: var(--font-size-sm);
    color: var(--gray);
}

/* ============================================
   Floating Action Buttons
   ============================================ */
.fab-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    z-index: 1000;
}

.fab {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: var(--transition-normal);
}

.fab:hover {
    transform: scale(1.1);
}

.fab-phone {
    background: var(--primary-gradient);
}

.fab-whatsapp {
    background: #25D366;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }

    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .page-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: 0;
    }

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

    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .content-viewer {
        padding: var(--space-4);
    }

    .admin-sidebar {
        width: 100%;
        position: relative;
    }

    .admin-layout {
        flex-direction: column;
    }

    .learning-nav {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }

    .hero-section {
        padding: var(--space-8) var(--space-4);
    }

    .hero-icon {
        font-size: 3rem;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mt-8 {
    margin-top: var(--space-8);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

.p-4 {
    padding: var(--space-4);
}

.p-6 {
    padding: var(--space-6);
}

.p-8 {
    padding: var(--space-8);
}

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

.rounded-xl {
    border-radius: var(--radius-xl);
}

.rounded-2xl {
    border-radius: var(--radius-2xl);
}

.shadow-md {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.shadow-xl {
    box-shadow: var(--shadow-xl);
}

.bg-primary {
    background: var(--primary-gradient);
}

.bg-secondary {
    background: var(--secondary-gradient);
}

.bg-white {
    background: var(--white);
}

.text-white {
    color: var(--white);
}

.text-dark {
    color: var(--dark);
}

.text-gray {
    color: var(--gray);
}

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

.font-bold {
    font-weight: 700;
}

.font-semibold {
    font-weight: 600;
}

/* Glassmorphism Effect */
.glass {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* Gradient Text */
.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}