/* ==========================================================================
   Lesson Page Styles - Extends base style.css
   ========================================================================== */

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.nav-progress {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 180px;
}

.progress-bar {
    height: 6px;
    background: var(--bg-subtle);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.8rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.15s;
}

.btn-nav:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-nav.btn-index {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
}

.btn-nav.btn-index:hover {
    background: var(--accent-hover);
}

/* Lesson Header */
.lesson-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

.lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.duration, .concepts-badge, .commands-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.6rem;
    background: var(--bg-subtle);
    border-radius: 999px;
    font-weight: 600;
}

/* Lesson Body */
.lesson-body {
    font-size: 1.02rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.lesson-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 2rem 0 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--border-color);
}

.lesson-body h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.lesson-body code {
    background: var(--bg-subtle);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-primary);
}

.lesson-body pre {
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.lesson-body pre code {
    background: transparent;
    color: var(--text-primary);
    padding: 0;
    font-size: 0.9rem;
}

.lesson-body ul, .lesson-body ol {
    margin: 0.75rem 0 0.75rem 1.5rem;
}

.lesson-body li {
    margin-bottom: 0.35rem;
}

.lesson-body blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.lesson-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.lesson-body th,
.lesson-body td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.lesson-body th {
    background: var(--bg-surface);
    font-weight: 700;
    color: var(--text-primary);
}

.lesson-body tr:nth-child(even) {
    background: var(--bg-subtle);
}

/* Commands Section */
.commands-section {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
}

.commands-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.command-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}

.command-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    padding: 1rem;
    box-shadow: var(--card-shadow);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.command-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--card-shadow), var(--glow);
}

.cmd-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.cmd-code {
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.4rem 0.75rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    flex: 1;
    min-width: 200px;
    user-select: all;
}

.btn-copy {
    background: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-copy:hover, .btn-copy.copied {
    background: var(--accent-hover);
}

.cmd-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.cmd-example {
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    font-size: 0.82rem;
    overflow-x: auto;
}

.cmd-example code {
    background: transparent;
    color: var(--text-primary);
    padding: 0;
}

/* Quiz Section */
.quiz-section {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
}

.quiz-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quiz-question {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--card-shadow);
}

.quiz-question h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-page);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
}

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

.quiz-option input[type="radio"] {
    accent-color: var(--accent-primary);
    width: 18px;
    height: 18px;
}

.quiz-option.correct {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.quiz-option.incorrect {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.quiz-feedback {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.quiz-feedback.correct {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid #22c55e;
    color: #166534;
}

.quiz-feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid #ef4444;
    color: #991b1b;
}

.btn-submit-quiz {
    width: 100%;
    padding: 0.85rem;
    background: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.15s;
}

.btn-submit-quiz:hover {
    background: var(--accent-hover);
}

.quiz-result {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    margin-top: 1rem;
}

.quiz-result h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.score {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-primary);
}

.btn-retry {
    margin-top: 1rem;
    padding: 0.6rem 1.2rem;
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
}

.btn-retry:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Responsive */
@media (max-width: 640px) {
    .lesson-nav { flex-direction: column; align-items: stretch; }
    .nav-links { justify-content: center; }
    .command-grid { grid-template-columns: 1fr; }
    .cmd-header { flex-direction: column; align-items: stretch; }
    .cmd-code { min-width: 0; }
    .lesson-title { font-size: 1.5rem; }
}