/* Observatory Theme — Dark Terminal Aesthetic */

:root {
    --bg: #0d1117;
    --bg-secondary: #010409;
    --card-bg: #161b22;
    --border: #30363d;
    --text: #e6edf3;
    --muted: #8b949e;
    --accent: #f0a500;
    --accent2: #238636;
    --success: #238636;
    --error: #da3633;
    --warning: #d29922;
    --info: #58a6ff;
}

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

html, body {
    height: 100%;
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

code, pre {
    font-family: 'JetBrains Mono', monospace;
}

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

a:hover {
    color: #ffb81c;
}

button, .btn {
    font-family: 'Inter', sans-serif;
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.btn {
    display: inline-block;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg);
}

.btn-primary:hover {
    background-color: #ffb81c;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background-color: #2ea043;
}

.btn-outline {
    border: 1px solid var(--border);
    color: var(--text);
    background-color: transparent;
}

.btn-outline:hover {
    background-color: var(--card-bg);
    border-color: var(--accent);
}

/* Layout */
.layout {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 280px;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    overflow-y: auto;
}

.sidebar-header h1 {
    font-size: 20px;
    margin-bottom: 24px;
}

.sidebar-header a {
    color: var(--accent);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.nav-module {
    padding: 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    transition: background-color 0.2s;
}

.nav-module:hover {
    background-color: var(--bg);
}

.nav-module-title {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.progress-mini {
    height: 4px;
    background-color: var(--border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.progress-bar-small {
    height: 100%;
    background-color: var(--accent2);
    transition: width 0.3s;
}

.progress-text {
    font-size: 11px;
    color: var(--muted);
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 48px;
}

/* Hero Section */
.hero {
    margin-bottom: 48px;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 20px;
    color: var(--muted);
    margin-bottom: 32px;
}

/* Progress Section */
.progress-section {
    margin: 24px 0;
}

.progress-section h2 {
    font-size: 18px;
    margin-bottom: 16px;
}

.progress-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
}

.progress-bar {
    height: 8px;
    background-color: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent2);
    transition: width 0.3s;
}

.progress-label {
    font-size: 14px;
    color: var(--muted);
}

/* Modules Grid */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.module-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    transition: all 0.2s;
}

.module-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(240, 165, 0, 0.1);
}

.module-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.module-card h3 {
    font-size: 12px;
    color: var(--muted);
    font-weight: 600;
    text-transform: uppercase;
}

.progress-badge {
    background-color: var(--border);
    color: var(--muted);
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
}

.module-card h2 {
    font-size: 20px;
    margin-bottom: 8px;
}

.module-card h2 a {
    color: var(--text);
}

.module-card h2 a:hover {
    color: var(--accent);
}

.module-card > p {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 16px;
}

.module-lessons {
    margin: 16px 0;
}

.module-lessons ul {
    list-style: none;
    font-size: 13px;
}

.module-lessons li {
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
}

.module-lessons li:last-child {
    border-bottom: none;
}

.module-lessons a {
    color: var(--text);
}

.module-lessons a:hover {
    color: var(--accent);
}

.lesson-time {
    float: right;
    color: var(--muted);
    font-size: 12px;
}

.module-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.module-actions .btn {
    flex: 1;
    text-align: center;
}

/* Module Header */
.module-header {
    margin-bottom: 48px;
}

.module-header h1 {
    font-size: 40px;
    margin-bottom: 8px;
}

.module-description {
    font-size: 18px;
    color: var(--muted);
    margin-bottom: 24px;
}

/* Lessons List */
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 24px 0;
}

.lesson-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    transition: all 0.2s;
}

.lesson-item:hover {
    border-color: var(--accent);
}

.lesson-item.completed {
    border-color: var(--success);
    background-color: rgba(35, 134, 54, 0.05);
}

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

.lesson-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.badge-success {
    background-color: var(--success);
    color: white;
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 4px;
}

/* Lesson Header */
.lesson-header {
    margin-bottom: 32px;
}

.breadcrumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: var(--accent);
}

.lesson-header h1 {
    font-size: 36px;
    margin-bottom: 12px;
}

.lesson-meta {
    font-size: 14px;
    color: var(--muted);
}

/* Lesson Content */
.lesson-content {
    max-width: 800px;
}

.markdown-body {
    font-size: 16px;
    line-height: 1.8;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
    margin: 24px 0 16px 0;
    font-weight: 600;
}

.markdown-body h1 { font-size: 28px; }
.markdown-body h2 { font-size: 24px; }
.markdown-body h3 { font-size: 20px; }
.markdown-body h4 { font-size: 16px; }

.markdown-body p {
    margin-bottom: 16px;
}

.markdown-body pre {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
}

.markdown-body code {
    background-color: var(--card-bg);
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--accent);
}

.markdown-body pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text);
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 16px;
    margin-left: 0;
    margin-bottom: 16px;
    color: var(--muted);
    font-style: italic;
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 16px;
    margin-left: 24px;
}

.markdown-body li {
    margin-bottom: 8px;
}

.lesson-nav {
    display: flex;
    gap: 12px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.lesson-nav .btn {
    flex: 1;
}

/* Quiz Styles */
.quiz-header {
    margin-bottom: 32px;
}

.quiz-header h1 {
    font-size: 36px;
    margin-bottom: 8px;
}

.quiz-header p {
    color: var(--muted);
    font-size: 16px;
}

.quiz-form {
    max-width: 800px;
}

.quiz-instructions {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    margin-bottom: 32px;
    color: var(--muted);
}

.questions-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-bottom: 32px;
}

.question-item h3 {
    margin-bottom: 16px;
    font-size: 18px;
}

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

.option-label {
    display: flex;
    align-items: center;
    padding: 12px;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.option-label:hover {
    border-color: var(--accent);
}

.option-label input[type="radio"] {
    margin-right: 12px;
    cursor: pointer;
}

.quiz-actions {
    display: flex;
    gap: 12px;
}

.quiz-actions .btn {
    flex: 1;
}

/* Quiz Results */
.quiz-results {
    max-width: 800px;
}

.results-header {
    background-color: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    margin-bottom: 32px;
}

.results-header.passed {
    border-color: var(--success);
    background: linear-gradient(rgba(35, 134, 54, 0.05), rgba(35, 134, 54, 0.05));
}

.results-header.failed {
    border-color: var(--error);
}

.results-header h2 {
    font-size: 32px;
    margin-bottom: 12px;
}

.score {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.best-score {
    font-size: 14px;
    color: var(--muted);
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.result-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
}

.result-item.correct {
    border-left: 4px solid var(--success);
}

.result-item.incorrect {
    border-left: 4px solid var(--error);
}

.result-question {
    display: flex;
    gap: 16px;
}

.result-question h3 {
    margin-bottom: 12px;
    font-size: 16px;
}

.result-answer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    margin-bottom: 12px;
}

.result-answer p {
    margin: 0;
}

.result-icon {
    font-size: 24px;
    text-align: center;
    min-width: 40px;
}

.result-item.correct .result-icon {
    color: var(--success);
}

.result-item.incorrect .result-icon {
    color: var(--error);
}

/* Syntax Highlighting */
.hljs {
    background: transparent !important;
    padding: 0 !important;
}

.hljs-string { color: #85e89d; }
.hljs-number { color: #79b8ff; }
.hljs-literal { color: #79b8ff; }
.hljs-attr { color: #79b8ff; }
.hljs-title { color: #f97583; }
.hljs-keyword { color: #ff7b72; }

/* Responsive */
@media (max-width: 768px) {
    .layout {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 16px;
    }
    
    .main-content {
        padding: 24px;
    }
    
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .module-header h1 {
        font-size: 28px;
    }
    
    .lesson-header h1 {
        font-size: 28px;
    }
}

/* Print Styles */
@media print {
    .sidebar, .lesson-nav, .quiz-actions, .module-actions {
        display: none;
    }
}