/* ============================================
   DEEP DIVE TRACK - CYBER GLASS DESIGN SYSTEM
   K9IO Academy - Advanced Technical Track
   ============================================ */
/* FIXED BY: AGENT-B2-MOD2 | DATE: 2025-11-06 | FIXES: Added --accent-red, --accent-yellow CSS variables */

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== COLOR SYSTEM ===== */
:root {
    /* Backgrounds */
    --bg-primary: #0a0a0f;           /* Very dark blue-black */
    --bg-secondary: #12121a;         /* Slightly lighter */
    --bg-card: rgba(255,255,255,0.03); /* Frosted glass */
    --bg-card-hover: rgba(255,255,255,0.05);

    /* Neon Accents */
    --accent-cyan: #00f0ff;          /* Electric cyan (primary) */
    --accent-purple: #a855f7;        /* Neon purple (secondary) */
    --accent-pink: #ff006e;          /* Hot pink (highlights) */
    --accent-green: #00ff88;         /* Neon green (success) */
    --accent-red: #ff4444;           /* Red warning/error (generated 2025-11-06) */
    --accent-yellow: #ffae00;        /* Yellow/orange accent (generated 2025-11-06) */

    /* Text */
    --text-primary: #ffffff;         /* White */
    --text-secondary: #a0a0b0;       /* Light gray */
    --text-muted: #606070;           /* Muted gray */

    /* Effects */
    --glow-cyan: 0 0 20px rgba(0,240,255,0.5);
    --glow-purple: 0 0 20px rgba(168,85,247,0.5);
    --glow-pink: 0 0 20px rgba(255,0,110,0.5);
    --border-glow: 1px solid rgba(0,240,255,0.3);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);
    --gradient-card: linear-gradient(135deg, rgba(0,240,255,0.05) 0%, rgba(168,85,247,0.05) 100%);
}

/* ===== BODY & TYPOGRAPHY ===== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    padding-top: 70px; /* Space for sticky nav */
}

/* Background effects */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(0,240,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(168,85,247,0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

/* ===== HEADINGS ===== */
h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-top: 50px;
    margin-bottom: 24px;
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
}

h3 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

h4 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--accent-purple);
}

p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

/* ===== STICKY NAVIGATION ===== */
.sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: var(--border-glow);
    z-index: 1000;
    padding: 15px 20px;
    box-shadow: 0 4px 12px rgba(0,240,255,0.1);
}

.sticky-nav .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.breadcrumb {
    font-size: 14px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.breadcrumb a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: all 0.2s ease;
}

.breadcrumb a:hover {
    color: var(--accent-purple);
    text-shadow: var(--glow-purple);
}

.breadcrumb span {
    margin: 0 8px;
    color: var(--text-muted);
}

.chapter-meta-nav,
.quiz-meta-nav {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== MAIN CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

/* ===== FROSTED GLASS CARD ===== */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: var(--border-glow);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.glass-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--glow-cyan);
    transform: translateY(-2px);
}

/* ===== MODULE BADGE ===== */
.module-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--gradient-primary);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    color: var(--bg-primary);
}

/* ===== META INFO ===== */
.meta-info {
    display: flex;
    gap: 30px;
    margin-top: 30px;
    padding: 20px;
    background: var(--bg-card);
    border: var(--border-glow);
    border-radius: 12px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.meta-item span:first-child {
    font-size: 20px;
}

/* ===== PROGRESS BAR ===== */
.progress-section {
    margin: 40px 0;
    padding: 30px;
    background: var(--bg-card);
    border: var(--border-glow);
    border-radius: 12px;
}

.progress-section h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--accent-cyan);
}

.progress-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(0,240,255,0.2);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width 0.5s ease;
    box-shadow: var(--glow-cyan);
}

.progress-text {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 12px;
    font-weight: 600;
}

/* ===== CHAPTER CARDS ===== */
.chapters-section {
    margin: 50px 0;
}

.section-title {
    font-size: 28px;
    color: var(--accent-cyan);
    margin-bottom: 30px;
    text-shadow: var(--glow-cyan);
}

.chapter-card {
    display: flex;
    gap: 30px;
    align-items: center;
    padding: 30px;
    margin-bottom: 20px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: var(--border-glow);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.chapter-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--glow-cyan);
    transform: translateX(8px);
}

.chapter-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
    min-width: 80px;
    text-align: center;
}

.chapter-content {
    flex: 1;
}

.chapter-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    margin-top: 0;
}

.chapter-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.chapter-meta {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.chapter-link {
    display: inline-flex;
    align-items: center;
    padding: 12px 30px;
    background: var(--gradient-primary);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.chapter-link:hover {
    box-shadow: var(--glow-cyan);
    transform: scale(1.05);
}

/* ===== CODE BLOCKS ===== */
pre {
    background: var(--bg-secondary);
    border: var(--border-glow);
    border-radius: 12px;
    padding: 20px;
    margin: 24px 0;
    overflow-x: auto;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.6;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    color: var(--accent-cyan);
}

pre code {
    color: var(--text-primary);
}

/* Inline code */
p code,
li code {
    background: var(--bg-secondary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 14px;
    border: 1px solid rgba(0,240,255,0.2);
}

/* ===== HIGHLIGHT BOXES ===== */
.highlight-box {
    background: var(--gradient-card);
    border-left: 4px solid var(--accent-cyan);
    border-radius: 12px;
    padding: 24px;
    margin: 30px 0;
    backdrop-filter: blur(10px);
}

.highlight-box h4 {
    margin-top: 0;
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
}

.intro-story {
    background: rgba(168,85,247,0.1);
    border-left: 4px solid var(--accent-purple);
    padding: 24px;
    margin-bottom: 40px;
    border-radius: 12px;
}

.key-takeaway {
    background: rgba(0,255,136,0.1);
    border-left: 4px solid var(--accent-green);
    padding: 24px;
    margin: 30px 0;
    border-radius: 12px;
}

.key-takeaway h4 {
    color: var(--accent-green);
    text-shadow: 0 0 20px rgba(0,255,136,0.5);
}

/* ===== TERM CARDS ===== */
.term-card {
    background: var(--bg-card);
    border-left: 4px solid var(--accent-purple);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
    border: var(--border-glow);
    border-left: 4px solid var(--accent-purple);
}

.term-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--accent-purple);
    margin-bottom: 12px;
    text-shadow: var(--glow-purple);
}

.term-definition {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.term-example,
.term-why,
.term-analogy {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.term-example strong,
.term-why strong,
.term-analogy strong {
    color: var(--accent-cyan);
}

/* ===== LISTS ===== */
ul, ol {
    margin: 20px 0;
    padding-left: 30px;
    color: var(--text-secondary);
}

li {
    margin-bottom: 12px;
    line-height: 1.7;
}

/* ===== QUIZ STYLES ===== */
.quiz-container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: var(--border-glow);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 30px;
}

.quiz-intro {
    text-align: center;
    margin-bottom: 40px;
}

.quiz-intro p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

#question-container {
    margin-bottom: 30px;
}

.question-number {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.question-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.answer-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.answer-option {
    background: var(--bg-card);
    border: 2px solid rgba(0,240,255,0.2);
    border-radius: 8px;
    padding: 16px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.answer-option:hover {
    border-color: var(--accent-cyan);
    background: var(--bg-card-hover);
    box-shadow: var(--glow-cyan);
    transform: translateX(4px);
}

.answer-option.selected {
    border-color: var(--accent-cyan);
    background: rgba(0,240,255,0.1);
    color: var(--text-primary);
    font-weight: 600;
}

.answer-option.correct {
    border-color: var(--accent-green);
    background: rgba(0,255,136,0.1);
    color: var(--accent-green);
}

.answer-option.correct::before {
    content: '✓ ';
    color: var(--accent-green);
    font-weight: bold;
    margin-right: 8px;
}

.answer-option.incorrect {
    border-color: var(--accent-pink);
    background: rgba(255,0,110,0.1);
    color: var(--accent-pink);
}

.answer-option.incorrect::before {
    content: '✗ ';
    color: var(--accent-pink);
    font-weight: bold;
    margin-right: 8px;
}

#feedback {
    margin-top: 20px;
    padding: 20px;
    border-radius: 12px;
    font-size: 15px;
    line-height: 1.7;
}

#feedback.correct {
    background: rgba(0,255,136,0.1);
    border: 2px solid var(--accent-green);
    color: var(--accent-green);
}

#feedback.incorrect {
    background: rgba(255,0,110,0.1);
    border: 2px solid var(--accent-pink);
    color: var(--accent-pink);
}

/* ===== BUTTONS ===== */
.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: var(--gradient-primary);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    box-shadow: var(--glow-cyan);
    transform: scale(1.05);
}

.btn-secondary {
    display: inline-block;
    padding: 14px 32px;
    background: transparent;
    color: var(--accent-cyan);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 16px;
    border: 2px solid var(--accent-cyan);
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-secondary:hover {
    background: rgba(0,240,255,0.1);
    box-shadow: var(--glow-cyan);
}

/* ===== NAVIGATION BUTTONS ===== */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 60px;
    gap: 20px;
}

.nav-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--bg-card);
    border: var(--border-glow);
    border-radius: 25px;
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-button:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--glow-cyan);
    transform: translateX(4px);
}

.nav-button.prev:hover {
    transform: translateX(-4px);
}

/* ===== FOOTER ===== */
footer {
    margin-top: 80px;
    padding: 40px 20px;
    text-align: center;
    border-top: var(--border-glow);
    color: var(--text-muted);
    font-size: 14px;
}

footer a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--accent-purple);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    h1 { font-size: 36px; }
    h2 { font-size: 28px; }
    h3 { font-size: 20px; }

    .container { padding: 20px 15px; }

    .chapter-card {
        flex-direction: column;
        gap: 20px;
    }

    .chapter-number {
        font-size: 36px;
        min-width: auto;
    }

    .meta-info {
        flex-direction: column;
        gap: 15px;
    }

    .navigation-buttons {
        flex-direction: column;
    }

    .glass-card { padding: 24px; }
    .quiz-container { padding: 24px; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-cyan { color: var(--accent-cyan); }
.text-purple { color: var(--accent-purple); }
.text-pink { color: var(--accent-pink); }
.text-green { color: var(--accent-green); }

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }