/**
 * Bio-Energetic Sequencing Model Course Platform
 * Version: 2.0.0
 * Author: Mullo Saint Research
 *
 * Rock Lee Style: Maximum effort, no shortcuts, unstoppable dedication
 */

/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */

:root {
    /* Colors - Light Mode */
    --color-bg: #f8f7f5;
    --color-bg-surface: #ffffff;
    --color-bg-elevated: #f0efed;
    --color-text: #0c0c0c;
    --color-text-secondary: #4a4a4a;
    --color-text-tertiary: #6b6b6b;
    --color-hairline: #e5e5e5;
    --color-border: #d4d4d4;

    /* Brand Colors */
    --color-primary: #667eea;
    --color-primary-hover: #5a6fd6;
    --color-primary-subtle: #eef0fd;
    --color-secondary: #764ba2;
    --color-accent: #d32f2f;
    --color-success: #28a745;
    --color-success-subtle: #d4edda;
    --color-warning: #ffc107;
    --color-warning-subtle: #fff3cd;
    --color-info: #17a2b8;
    --color-info-subtle: #d1ecf1;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --gradient-subtle: linear-gradient(135deg, #f8f7f5 0%, #eef0fd 100%);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 3rem;
    --space-8: 4rem;
    --space-9: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --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);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 280px;
    --header-height: 64px;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-bg: #0c0c0c;
    --color-bg-surface: #1a1a1a;
    --color-bg-elevated: #252525;
    --color-text: #f4f4f4;
    --color-text-secondary: #b0b0b0;
    --color-text-tertiary: #8a8a8a;
    --color-hairline: #2a2a2a;
    --color-border: #3a3a3a;
    --color-primary-subtle: #1e2340;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--space-4);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin: 0 0 var(--space-4);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Course Layout - Sidebar + Main */
.course-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

@media (max-width: 768px) {
    .course-layout {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Course Sidebar
   ========================================================================== */

.course-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-bg-surface);
    border-right: 1px solid var(--color-hairline);
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    padding: var(--space-5);
    border-bottom: 1px solid var(--color-hairline);
}

.sidebar-logo {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text);
}

.sidebar-nav {
    padding: var(--space-4) 0;
}

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

.nav-section-title {
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

.nav-item.active {
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    border-right: 3px solid var(--color-primary);
}

.nav-item.completed .nav-icon {
    color: var(--color-success);
}

.nav-item.locked {
    opacity: 0.5;
    pointer-events: none;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-text {
    font-size: var(--text-sm);
    font-weight: 500;
}

.nav-badge {
    margin-left: auto;
    padding: 2px 8px;
    font-size: var(--text-xs);
    font-weight: 600;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
}

/* Progress Bar in Sidebar */
.sidebar-progress {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-hairline);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.progress-bar {
    height: 6px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-brand);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */

.course-main {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

@media (max-width: 768px) {
    .course-main {
        margin-left: 0;
    }
}

/* Course Header */
.course-header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-6);
    background: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-hairline);
    z-index: 50;
}

.header-title {
    font-size: var(--text-lg);
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* ==========================================================================
   Module Page Styles
   ========================================================================== */

.module-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
}

.module-header {
    margin-bottom: var(--space-7);
}

.module-eyebrow {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-subtle);
    border-radius: var(--radius-full);
}

.module-title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-3);
}

.module-meta {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

/* Lesson Cards */
.lesson-grid {
    display: grid;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.lesson-card {
    display: grid;
    grid-template-columns: 120px 1fr auto;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

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

.lesson-card.completed {
    border-left: 4px solid var(--color-success);
}

.lesson-card.locked {
    opacity: 0.6;
    pointer-events: none;
}

.lesson-thumbnail {
    width: 120px;
    height: 68px;
    background: var(--gradient-brand);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-2xl);
}

.lesson-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lesson-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.lesson-duration {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.lesson-status {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-bg-elevated);
    color: var(--color-text-tertiary);
}

.lesson-status.completed {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

/* ==========================================================================
   Video Player Page
   ========================================================================== */

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.video-container iframe,
.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--gradient-dark);
    color: white;
}

.video-placeholder-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
}

.video-placeholder-text {
    font-size: var(--text-lg);
    opacity: 0.9;
}

/* Video Navigation */
.video-nav {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-hairline);
}

/* ==========================================================================
   Quiz System
   ========================================================================== */

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-header {
    text-align: center;
    margin-bottom: var(--space-7);
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.quiz-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
}

.quiz-progress-fill {
    height: 100%;
    background: var(--gradient-brand);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.quiz-counter {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.question-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-5);
}

.question-text {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-5);
}

.answer-options {
    display: grid;
    gap: var(--space-3);
}

.answer-option {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg);
    border: 2px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.answer-option:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-subtle);
}

.answer-option.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-subtle);
}

.answer-option.correct {
    border-color: var(--color-success);
    background: var(--color-success-subtle);
}

.answer-option.incorrect {
    border-color: var(--color-accent);
    background: #fce4e4;
}

.answer-letter {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--text-sm);
}

.answer-text {
    flex: 1;
}

/* Quiz Results */
.quiz-results {
    text-align: center;
    padding: var(--space-8);
}

.results-score {
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.results-label {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.results-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-lg);
    font-weight: 600;
    border-radius: var(--radius-full);
}

.results-badge.passed {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.results-badge.failed {
    background: #fce4e4;
    color: var(--color-accent);
}

/* ==========================================================================
   Dashboard
   ========================================================================== */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-5);
    margin-bottom: var(--space-6);
}

.dashboard-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
}

.dashboard-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.dashboard-card-title {
    font-size: var(--text-lg);
    font-weight: 600;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

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

.stat-value {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: inherit;
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-surface);
    border-color: var(--color-primary);
}

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

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-lg);
}

.btn-block {
    width: 100%;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

/* ==========================================================================
   Alerts & Notifications
   ========================================================================== */

.alert {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.alert-success {
    background: var(--color-success-subtle);
    border: 1px solid var(--color-success);
    color: #155724;
}

.alert-warning {
    background: var(--color-warning-subtle);
    border: 1px solid var(--color-warning);
    color: #856404;
}

.alert-info {
    background: var(--color-info-subtle);
    border: 1px solid var(--color-info);
    color: #0c5460;
}

/* ==========================================================================
   Paywall / Auth Gate
   ========================================================================== */

.paywall-gate {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    padding: var(--space-8);
}

.paywall-icon {
    font-size: 4rem;
    margin-bottom: var(--space-5);
}

.paywall-title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-3);
}

.paywall-message {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 500px;
    margin-bottom: var(--space-6);
}

/* ==========================================================================
   Login / Auth Pages
   ========================================================================== */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background: var(--gradient-subtle);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-xl);
    padding: var(--space-7);
    box-shadow: var(--shadow-xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.auth-logo {
    font-size: var(--text-2xl);
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-title {
    font-size: var(--text-2xl);
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    color: var(--color-text-secondary);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-5);
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-hairline);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
    .lesson-card {
        grid-template-columns: 100px 1fr auto;
    }

    .lesson-thumbnail {
        width: 100px;
        height: 56px;
    }
}

@media (max-width: 768px) {
    .course-sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

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

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

    .module-content {
        padding: var(--space-5) var(--space-4);
    }

    .lesson-card {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }

    .lesson-thumbnail {
        width: 100%;
        height: 160px;
    }

    .video-nav {
        flex-direction: column;
        gap: var(--space-3);
    }

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

/* ==========================================================================
   Utilities
   ========================================================================== */

.text-center { text-align: center; }
.text-muted { color: var(--color-text-secondary); }
.font-bold { font-weight: 700; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .course-sidebar,
    .course-header,
    .btn,
    .video-container {
        display: none !important;
    }

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

    body {
        background: white;
        color: black;
    }
}