/* Retro Dark Mode Theme - Godot Game Design Class */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&display=swap');

:root {
    --retro-bg: #0a0c0f;
    --retro-surface: #0f1117;
    --retro-terminal: #1a1d24;
    --retro-green: #4afc78;
    --retro-green-dim: #2a9d4e;
    --retro-amber: #ffb347;
    --retro-red: #ff5f5f;
    --retro-blue: #5f9fff;
    --retro-purple: #b87dff;
    --retro-cyan: #5fcfff;
    --retro-white: #c0c5ce;
    --retro-gray: #65737e;
    --retro-border: #2a2e3a;
    --glow: 0 0 10px rgba(74, 252, 120, 0.3);
}

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

body {
    font-family: 'Fira Code', 'Courier New', monospace;
    background: var(--retro-bg);
    color: var(--retro-white);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    position: relative;
}

/* ===== GLOBAL EFFECTS ===== */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15) 0px,
        rgba(0, 0, 0, 0.15) 2px,
        transparent 2px,
        transparent 6px
    );
    pointer-events: none;
    z-index: 999;
}

@keyframes flicker {
    0%, 20%, 100% { opacity: 1; }
    5%, 10% { opacity: 0.96; }
}

body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    pointer-events: none;
    animation: flicker 6s infinite;
    z-index: 998;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

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

/* ===== TYPOGRAPHY ===== */
h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--retro-green);
    text-shadow: 0 0 15px var(--retro-green);
    border-left: 4px solid var(--retro-green);
    padding-left: 20px;
    margin-bottom: 30px;
    letter-spacing: -1px;
    animation: glitch 3s infinite;
}

@keyframes glitch {
    0%, 95%, 98%, 100% { transform: skew(0deg, 0deg); opacity: 1; }
    96% { transform: skew(2deg, -1deg); opacity: 0.9; text-shadow: -2px 0 var(--retro-red); }
    97% { transform: skew(-2deg, 1deg); opacity: 0.95; text-shadow: 2px 0 var(--retro-blue); }
}

/* ===== SITE HEADER ===== */
.site-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 20px;
    background: var(--retro-terminal);
    border: 2px solid var(--retro-border);
    border-radius: 12px;
}

.site-header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    border-left: none;
    text-align: center;
    animation: none;
}

.site-tagline {
    font-size: 1.2rem;
    color: var(--retro-cyan);
    font-family: monospace;
}

/* ===== COURSE STATS ===== */
.course-overview {
    margin-bottom: 40px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    border-color: var(--retro-green);
    transform: translateY(-3px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--retro-green);
    font-family: monospace;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--retro-gray);
    margin-top: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== UNITS GRID ===== */
.units-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.unit-card {
    background: var(--retro-terminal);
    border: 2px solid var(--retro-border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

.unit-card:hover {
    transform: translateY(-5px);
    border-color: var(--retro-green);
    box-shadow: var(--glow);
}

.unit-card-header {
    background: linear-gradient(135deg, rgba(74, 252, 120, 0.1), transparent);
    padding: 25px;
    border-bottom: 1px solid var(--retro-border);
}

.unit-number {
    font-size: 0.8rem;
    color: var(--retro-green);
    font-family: monospace;
    letter-spacing: 2px;
}

.unit-card-header h3 {
    font-size: 1.5rem;
    margin: 10px 0;
    color: var(--retro-white);
}

.unit-description {
    color: var(--retro-gray);
    font-size: 0.9rem;
    line-height: 1.5;
}

.unit-card-body {
    padding: 20px;
}

.unit-progress-info {
    margin-bottom: 15px;
    width: 100%;
    display: flex;
    flex-direction: column;
}

.unit-progress-text {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.8rem;
    color: var(--retro-cyan);
    width: 100%;
}

.unit-progress-bar {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    border-radius: 4px;
    padding: 2px;
    margin: 10px 0;
    width: 100%;
}

.unit-progress-fill {
    background: linear-gradient(90deg, var(--retro-green), var(--retro-green-dim));
    height: 16px;
    border-radius: 2px;
    transition: width 0.5s ease;
}

.unit-stats {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    font-size: 0.75rem;
    color: var(--retro-gray);
}

.unit-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.unit-card-footer {
    padding: 15px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--retro-border);
}

.start-unit-button {
    display: block;
    text-align: center;
    padding: 10px;
    background: var(--retro-green);
    color: var(--retro-bg);
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.start-unit-button:hover {
    background: var(--retro-green-dim);
    transform: translateX(5px);
}

/* ===== OVERALL PROGRESS ===== */
.overall-progress-section {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    padding: 25px;
    margin: 40px 0;
}

.overall-progress-section h2 {
    margin-bottom: 15px;
    color: var(--retro-cyan);
    font-size: 1.3rem;
}

.overall-progress-bar {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 3px;
    margin: 15px 0;
}

.overall-progress-fill {
    background: linear-gradient(90deg, var(--retro-green), var(--retro-green-dim));
    height: 30px;
    border-radius: 6px;
    transition: width 0.5s ease;
    position: relative;
    overflow: hidden;
}

.overall-progress-fill::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 2s infinite;
}

.progress-details {
    text-align: center;
    color: var(--retro-cyan);
    font-family: monospace;
    margin-top: 10px;
}

/* ===== YOUTUBE SECTION ===== */
.youtube-section {
    margin-bottom: 40px;
    background: var(--retro-terminal);
    border: 2px solid var(--retro-border);
    border-radius: 12px;
    overflow: hidden;
}

.section-header {
    background: rgba(74, 252, 120, 0.1);
    padding: 15px 20px;
    border-bottom: 1px solid var(--retro-border);
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.section-header h2 {
    margin: 0;
    font-size: 1.3rem;
    color: var(--retro-cyan);
}

.section-icon {
    font-size: 1.5rem;
}

.section-divider {
    color: var(--retro-gray);
    letter-spacing: 2px;
    font-size: 0.8rem;
}

.youtube-placeholder {
    padding: 60px 20px;
    text-align: center;
    background: linear-gradient(135deg, var(--retro-bg) 0%, var(--retro-terminal) 100%);
}

.youtube-embed {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    max-width: 480px;
    margin: 0 auto;
}

.youtube-fallback {
    text-align: center;
    font-size: 0.9rem;
    margin: 10px 0 0;
}
.report-bug {
    text-align: center;
    font-size: 0.9rem;
    margin: 12px 0 0;
}

.youtube-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.placeholder-content {
    max-width: 400px;
    margin: 0 auto;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.placeholder-meta {
    margin-top: 20px;
    display: flex;
    gap: 15px;
    justify-content: center;
    font-size: 0.8rem;
    color: var(--retro-gray);
}

.youtube-playlist-link {
    display: block;
    text-decoration: none;
    border-bottom: none;
    padding: 0;
}

.youtube-playlist-link:hover {
    transform: none;
    text-shadow: none;
}

.youtube-thumbnail {
    position: relative;
    background: var(--retro-bg);
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.youtube-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.playlist-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.youtube-playlist-link:hover .playlist-overlay {
    opacity: 1;
}

.play-button {
    font-size: 4rem;
    color: white;
    text-shadow: 0 0 20px rgba(255, 0, 0, 0.5);
    line-height: 1;
}

.playlist-text {
    color: white;
    font-size: 1rem;
    margin-top: 10px;
    font-family: 'Fira Code', monospace;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 16px;
    border-radius: 20px;
}

/* ===== UNIT HEADER & BADGES ===== */
.unit-header {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
}

.unit-meta {
    display: flex;
    gap: 15px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.unit-badge {
    background: rgba(74, 252, 120, 0.1);
    border: 1px solid var(--retro-green);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--retro-green);
}

/* ===== STEP CARDS ===== */
.step-card {
    background: var(--retro-surface);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    margin-bottom: 30px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.step-card:hover {
    border-color: var(--retro-green);
    box-shadow: 0 4px 20px rgba(74, 252, 120, 0.1);
}

.step-header {
    background: rgba(26, 29, 36, 0.8);
    padding: 20px 25px;
    border-bottom: 1px solid var(--retro-border);
    display: flex;
    align-items: center;
    gap: 15px;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--retro-green);
    color: var(--retro-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    box-shadow: 0 0 10px var(--retro-green);
    flex-shrink: 0;
}

.step-title {
    flex: 1;
}

.step-title label {
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

.step-title .step-check {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.step-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
    padding: 25px;
}

.step-instructions {
    width: 100%;
    order: 1;
}

.step-media {
    width: 100%;
    order: 2;
    margin-top: 10px;
}

/* ===== IMAGES ===== */
.image-container {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.step-image {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    display: block;
    margin: 0 auto;
}

.image-caption {
    font-size: 0.75rem;
    color: var(--retro-gray);
    text-align: center;
    margin-top: 10px;
    font-style: italic;
}

.image-description {
    font-size: 0.8rem;
    color: var(--retro-white);
    margin-top: 10px;
    padding: 8px;
    background: rgba(74, 252, 120, 0.05);
    border-radius: 4px;
}

/* ===== INSTRUCTIONS ===== */
.instruction-section {
    margin-bottom: 25px;
}

.instruction-section h4 {
    color: var(--retro-cyan);
    margin-bottom: 12px;
    font-size: 1rem;
    border-left: 3px solid var(--retro-cyan);
    padding-left: 10px;
}

.instruction-section h5 {
    color: var(--retro-green);
    margin: 15px 0 8px 0;
    font-size: 0.9rem;
}

.instruction-section ul {
    margin: 10px 0 10px 25px;
    list-style-type: none;
}

.instruction-section li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
}

.instruction-section li::before {
    content: "•";
    color: var(--retro-green);
    position: absolute;
    left: 0;
    top: 0;
}

/* ===== TIP & WARNING BOXES ===== */
.tip-box, .warning-box {
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid;
}

.tip-box {
    background: rgba(74, 252, 120, 0.05);
    border-left-color: var(--retro-green);
    color: var(--retro-green);
}

.warning-box {
    background: rgba(255, 95, 95, 0.05);
    border-left-color: var(--retro-red);
    color: var(--retro-red);
}

/* ===== CONCEPT PRIMER BOX ===== */
.concept-box {
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid var(--retro-green);
    background: rgba(74, 252, 120, 0.05);
}

.concept-box summary {
    font-weight: bold;
    cursor: pointer;
    color: var(--retro-green);
}

.concept-box p {
    margin: 10px 0 0 0;
}

/* ===== PROGRESS CONTAINER ===== */
.steps {
    padding: 0;
    background: transparent;
}

.progress-container {
    margin-bottom: 30px;
    background: var(--retro-terminal);
    padding: 15px;
    border-radius: 8px;
}

.progress-bar {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    border-radius: 4px;
    padding: 2px;
    margin: 10px 0;
    overflow: hidden;
}

.progress-fill {
    background: linear-gradient(90deg, var(--retro-green), var(--retro-green-dim));
    height: 24px;
    border-radius: 2px;
    transition: width 0.5s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 2s infinite;
}

.progress-text {
    text-align: center;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--retro-cyan);
    font-family: monospace;
    font-weight: bold;
}

/* ===== STATUS MESSAGE ===== */
.status-message {
    background: var(--retro-terminal);
    border-left: 3px solid var(--retro-green);
    padding: 8px 15px;
    margin: 15px 0;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--retro-green);
    animation: fadeInOut 2s ease;
}

@keyframes fadeInOut {
    0% { opacity: 0; transform: translateY(-10px); }
    15% { opacity: 1; transform: translateY(0); }
    85% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-10px); }
}

/* ===== NAVIGATION ===== */
.section-header-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 15px 20px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    flex-wrap: wrap;
    gap: 15px;
}

.breadcrumb {
    font-size: 0.85rem;
    color: var(--retro-gray);
}

.breadcrumb a {
    color: var(--retro-cyan);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--retro-green);
}

.section-nav {
    display: flex;
    gap: 15px;
    align-items: center;
}

.section-nav-current {
    font-size: 0.9rem;
    color: var(--retro-green);
}

.next-button {
    background: var(--retro-green);
    color: var(--retro-bg);
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

.next-button:hover {
    transform: translateX(5px);
    box-shadow: var(--glow);
}

/* ===== UNIT OVERVIEW GRID ===== */
.unit-overview {
    margin: 40px 0;
}

.unit-overview h2 {
    color: var(--retro-cyan);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.sections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.section-card {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.section-card:hover {
    transform: translateY(-5px);
    border-color: var(--retro-green);
    box-shadow: 0 5px 20px rgba(74, 252, 120, 0.1);
}

.section-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--retro-green);
    opacity: 0.5;
    font-family: monospace;
}

.section-info {
    flex: 1;
}

.section-info h3 {
    color: var(--retro-white);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.section-info p {
    color: var(--retro-gray);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.section-progress {
    font-size: 0.8rem;
    color: var(--retro-cyan);
    margin-top: 10px;
}

.section-button {
    background: transparent;
    border: 2px solid var(--retro-green);
    color: var(--retro-green);
    padding: 10px;
    text-align: center;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.section-button:hover {
    background: var(--retro-green);
    color: var(--retro-bg);
    transform: translateX(5px);
}

/* ===== PAGE NAVIGATION ===== */
.page-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
    padding: 20px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    flex-wrap: wrap;
    gap: 15px;
}

.page-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

.page-button {
    padding: 8px 15px;
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    color: var(--retro-white);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.page-button:hover {
    border-color: var(--retro-green);
    color: var(--retro-green);
}

.current-page {
    padding: 8px 15px;
    background: var(--retro-green);
    color: var(--retro-bg);
    border-radius: 6px;
    font-weight: bold;
}

.nav-button {
    background: var(--retro-bg);
    border: 2px solid var(--retro-green);
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    color: var(--retro-green);
    transition: all 0.3s ease;
}

.nav-button:hover {
    background: var(--retro-green);
    color: var(--retro-bg);
    transform: translateX(-5px);
}

.nav-button.primary {
    background: var(--retro-green);
    color: var(--retro-bg);
    border-color: var(--retro-green);
}

.nav-button.primary:hover {
    background: var(--retro-green-dim);
    transform: translateX(5px);
}

/* ===== UNIT NAVIGATION ===== */
.unit-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
    padding: 20px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
}

.unit-completion-status {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.unit-completion-status .unit-progress-bar {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    border-radius: 4px;
    padding: 2px;
    width: 200px;
    margin-bottom: 5px;
}

/* ===== CHECKBOXES ===== */
.step-check {
    width: 18px;
    height: 18px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--retro-bg);
    border: 2px solid var(--retro-gray);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.step-check:checked {
    background: var(--retro-green);
    border-color: var(--retro-green);
}

.step-check:checked::after {
    content: "✓";
    position: absolute;
    color: var(--retro-bg);
    font-size: 14px;
    font-weight: bold;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.step-check:hover {
    border-color: var(--retro-green);
    box-shadow: 0 0 5px var(--retro-green);
}

.step-check:checked + span {
    text-decoration: line-through;
    color: var(--retro-gray);
    opacity: 0.7;
}

/* ===== KEYBOARD & CODE ===== */
kbd {
    background: var(--retro-bg);
    border: 1px solid var(--retro-gray);
    border-radius: 4px;
    padding: 2px 8px;
    font-family: monospace;
    font-size: 0.85rem;
    box-shadow: 0 2px 0 var(--retro-gray);
    margin: 0 2px;
}

code {
    background: var(--retro-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
    color: var(--retro-cyan);
}

/* ===== LINKS ===== */
a {
    color: var(--retro-cyan);
    text-decoration: none;
    border-bottom: 2px dotted var(--retro-cyan);
    transition: all 0.3s ease;
    display: inline-block;
    padding: 5px 0;
}

a:hover {
    color: var(--retro-green);
    border-bottom-color: var(--retro-green);
    text-shadow: 0 0 5px var(--retro-green);
    transform: translateX(-5px);
}

/* ===== FOOTER ===== */
.site-footer {
    margin-top: 50px;
    padding: 30px 20px;
    text-align: center;
    border-top: 1px solid var(--retro-border);
    color: var(--retro-gray);
    font-size: 0.85rem;
}

.footer-links {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--retro-gray);
    text-decoration: none;
    border-bottom: none;
}

.footer-links a:hover {
    color: var(--retro-green);
    transform: none;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
}

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

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

/* ===== SELECTION ===== */
::selection {
    background: var(--retro-green);
    color: var(--retro-bg);
}

::-moz-selection {
    background: var(--retro-green);
    color: var(--retro-bg);
}

/* ===== LOADING ===== */
.loading {
    text-align: center;
    padding: 50px;
    color: var(--retro-cyan);
    font-family: monospace;
    font-size: 1.2rem;
}

/* ===== TEST PAGES ===== */
.test-overview {
    margin-bottom: 40px;
}

.test-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.test-stat-card {
    background: var(--retro-terminal);
    border: 2px solid var(--retro-green);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.test-stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--retro-green);
    font-family: monospace;
}

.test-stat-label {
    font-size: 0.85rem;
    color: var(--retro-gray);
    margin-top: 5px;
}

.test-instructions {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    padding: 25px;
}

.test-instructions h3 {
    color: var(--retro-cyan);
    margin-bottom: 15px;
}

.test-section {
    margin-bottom: 30px;
}

.test-section-header {
    background: rgba(74, 252, 120, 0.1);
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.test-section-icon {
    font-size: 1.5rem;
}

.test-section-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--retro-green);
}

.bonus-section {
    border: 2px solid var(--retro-amber);
    border-radius: 12px;
    padding: 15px;
    margin-top: 20px;
}

.bonus-section .test-section-header {
    background: rgba(255, 179, 71, 0.1);
}

.bonus-section .test-section-title {
    color: var(--retro-amber);
}

.bonus-section .test-stat-number {
    color: var(--retro-amber);
}

.submission-section {
    margin: 40px 0;
    padding: 25px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
}

.submission-section h2 {
    color: var(--retro-cyan);
    margin-bottom: 20px;
}

.submission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.submission-card {
    background: var(--retro-surface);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 20px;
}

.submission-card h3 {
    color: var(--retro-green);
    margin-bottom: 15px;
}

.test-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
    padding: 20px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
}

.test-score {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--retro-cyan);
    font-family: monospace;
}

/* ===== SUBMISSION PAGE ===== */
.submission-guidelines {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
}

.submission-guidelines h2 {
    color: var(--retro-cyan);
    margin-bottom: 15px;
}

.submission-guidelines ul {
    margin: 15px 0;
    padding-left: 25px;
}

.submission-guidelines li {
    margin: 8px 0;
    color: var(--retro-white);
}

.submit-button {
    display: inline-block;
    background: var(--retro-green);
    color: var(--retro-bg);
    padding: 12px 25px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    margin-top: 10px;
}

.submit-button:hover {
    transform: translateX(5px);
    box-shadow: var(--glow);
}

.filter-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
    padding: 15px;
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
}

.filter-controls span {
    color: var(--retro-gray);
    font-size: 0.9rem;
}

.filter-btn {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    color: var(--retro-white);
    padding: 6px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
}

.filter-btn:hover {
    border-color: var(--retro-cyan);
    color: var(--retro-cyan);
}

.filter-btn.active {
    background: var(--retro-green);
    color: var(--retro-bg);
    border-color: var(--retro-green);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.submission-card {
    background: var(--retro-terminal);
    border: 1px solid var(--retro-border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.submission-card:hover {
    transform: translateY(-5px);
    border-color: var(--retro-green);
    box-shadow: var(--glow);
}

.submission-thumbnail {
    position: relative;
    background: var(--retro-bg);
    height: 180px;
    overflow: hidden;
}

.submission-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.submission-unit-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--retro-green);
    color: var(--retro-bg);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: bold;
}

.submission-info {
    padding: 20px;
}

.submission-info h3 {
    color: var(--retro-white);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.submission-author {
    color: var(--retro-cyan);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.submission-description {
    color: var(--retro-gray);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 15px;
}

.submission-links {
    display: flex;
    gap: 10px;
}

.submission-link {
    background: var(--retro-bg);
    border: 1px solid var(--retro-border);
    color: var(--retro-white);
    padding: 5px 15px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.submission-link:hover {
    border-color: var(--retro-green);
    color: var(--retro-green);
}

.submission-navigation {
    margin-top: 40px;
    padding: 20px 0;
    border-top: 1px solid var(--retro-border);
}

#empty-state {
    text-align: center;
    padding: 50px;
    color: var(--retro-gray);
}

/* ===== COMPARISON BOXES ===== */
.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.comparison-column {
    background: var(--retro-surface);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 15px 20px;
}

.comparison-column h5 {
    color: var(--retro-cyan);
    margin-bottom: 10px;
    font-size: 1rem;
}

.comparison-column ul {
    margin: 0;
    padding-left: 20px;
}

.comparison-column li {
    margin: 5px 0;
    color: var(--retro-white);
}

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

.download-link {
    display: inline-block;
    background: var(--retro-green);
    color: var(--retro-bg);
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    margin: 10px 0;
}

.download-link:hover {
    transform: translateX(5px);
    box-shadow: var(--glow);
}

/* ===== EXAMPLE BOXES ===== */
.example-box {
    background: var(--retro-surface);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 15px 20px;
    margin: 15px 0;
}

.example-box h5 {
    color: var(--retro-cyan);
    margin-bottom: 10px;
    font-size: 1rem;
}

.example-box ul {
    margin: 0;
    padding-left: 20px;
}

.example-box li {
    margin: 5px 0;
    color: var(--retro-white);
}

.example-box:nth-child(2) {
    border-color: var(--retro-amber);
}

.example-box:nth-child(2) h5 {
    color: var(--retro-amber);
}

/* ===== ASSET SOURCE CARDS ===== */
.asset-sources {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 20px 0;
}

.source-card {
    background: var(--retro-surface);
    border: 1px solid var(--retro-border);
    border-radius: 8px;
    padding: 15px;
    transition: all 0.3s ease;
}

.source-card:hover {
    border-color: var(--retro-green);
    transform: translateY(-3px);
}

.source-card h5 {
    color: var(--retro-cyan);
    margin-bottom: 8px;
    font-size: 1rem;
}

.source-card p {
    color: var(--retro-white);
    font-size: 0.85rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.source-link {
    display: inline-block;
    color: var(--retro-green);
    text-decoration: none;
    font-size: 0.85rem;
    border-bottom: none;
    padding: 0;
}

.source-link:hover {
    color: var(--retro-cyan);
    transform: translateX(3px);
    text-shadow: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 1.8rem;
        padding-left: 15px;
    }

    .steps {
        padding: 0;
    }

    .step-content {
        padding: 20px;
        gap: 20px;
    }

    .image-container {
        padding: 10px;
    }

    .step-card {
        margin-bottom: 20px;
    }

    .step-header {
        padding: 15px 20px;
    }

    .step-title label {
        font-size: 1rem;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .site-header h1 {
        font-size: 2rem;
    }

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

    .page-navigation {
        flex-direction: column;
        align-items: stretch;
    }

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

    .unit-navigation {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }

    .unit-completion-status {
        width: 100%;
        align-items: flex-start;
    }

    .unit-completion-status .unit-progress-bar {
        width: 100%;
    }

    .section-header-nav {
        flex-direction: column;
        text-align: center;
    }

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

    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-controls span {
        text-align: center;
    }

    .filter-btn {
        text-align: center;
    }

    .test-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .asset-sources {
        grid-template-columns: 1fr;
    }

    .comparison-box {
        grid-template-columns: 1fr;
    }
    /* Special submission card styling */
    .special-card {
        border-color: var(--retro-cyan);
        background: linear-gradient(135deg, var(--retro-terminal) 0%, rgba(95, 207, 255, 0.05) 100%);
    }

    .special-card:hover {
        border-color: var(--retro-cyan);
        box-shadow: 0 0 15px rgba(95, 207, 255, 0.3);
    }

    .special-card .unit-number {
        color: var(--retro-cyan);
    }

    .special-card .start-unit-button {
        background: var(--retro-cyan);
    }

    .special-card .start-unit-button:hover {
        background: #4ab0e0;
    }
}
/* A-6: disabled buttons for unwritten Unit 4 sections (prevents 404s) */
.section-button.disabled,
.next-button.disabled,
.nav-button.disabled {
    opacity: 0.45;
    pointer-events: none;
    cursor: not-allowed;
}

/* Code blocks wrap long lines instead of overflowing (added to live style.css 2026-11-04) */
pre {
    white-space: pre-wrap;
    overflow-wrap: break-word;
}