/* Grammar Page Styles */

/* Container */
.grammar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px 40px;
}

.lesson-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 24px 40px;
}

/* Header */
.grammar-header {
    text-align: center;
    margin-bottom: 48px;
}

.grammar-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 12px;
}

.grammar-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Lessons Grid */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

/* Lesson Card */
.lesson-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 24px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-hover);
}

.lesson-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.lesson-number {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lesson-level {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
    background: var(--accent);
    color: white;
}

.level-N5 {
    background: #10b981;
}

.level-N4 {
    background: #3b82f6;
}

.level-N3 {
    background: #8b5cf6;
}

.lesson-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 8px;
}

.lesson-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0 0 16px;
    line-height: 1.5;
}

.lesson-topics {
    margin-bottom: 20px;
}

.topics-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 8px;
}

.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.topic-tag {
    font-size: 0.8rem;
    padding: 4px 12px;
    background: var(--light-gray);
    color: var(--text-secondary);
    border-radius: 20px;
}

.lesson-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    transition: gap 0.2s;
}

.lesson-link:hover {
    gap: 12px;
}

/* Info Section */
.grammar-info {
    margin-top: 48px;
    padding-top: 48px;
    border-top: 1px solid var(--card-border);
}

.grammar-info h2 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.info-card {
    text-align: center;
    padding: 24px;
}

.info-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 16px;
}

.info-card h3 {
    font-size: 1.1rem;
    margin: 0 0 8px;
    color: var(--text-primary);
}

.info-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ==================== */
/* Lesson Page Styles   */
/* ==================== */

.lesson-header {
    margin-bottom: 40px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 24px;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent);
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.lesson-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 12px;
}

.lesson-header .lesson-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.lesson-header .lesson-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
}

/* Lesson Content */
.lesson-content {
    line-height: 1.8;
}

/* Grammar Section */
.grammar-section {
    margin-bottom: 48px;
}

.grammar-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
}

.grammar-section h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 24px 0 12px;
}

.grammar-section p {
    color: var(--text-secondary);
    margin: 0 0 16px;
}

/* Japanese Text */
.jp {
    font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Meiryo", sans-serif;
    font-size: 1.1em;
}

/* Grammar Pattern Box */
.grammar-pattern {
    background: linear-gradient(135deg, var(--card-bg), var(--light-gray));
    border: 2px solid var(--accent);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.pattern-header {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.pattern-formula {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Meiryo", sans-serif;
}

.pattern-reading {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.pattern-example {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 12px;
    font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Meiryo", sans-serif;
}

/* Example Box */
.example-box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.example-header {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.example-row {
    padding: 12px 0;
    border-bottom: 1px solid var(--card-border);
    display: grid;
    gap: 4px;
}

.example-row:last-child {
    border-bottom: none;
}

.example-row .jp {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 500;
}

.example-row .romaji {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

.example-row .translation {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Tip Box */
.tip-box {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    border-radius: 0 8px 8px 0;
    padding: 16px 20px;
    margin: 20px 0;
}

[data-theme="dark"] .tip-box {
    background: rgba(245, 158, 11, 0.15);
}

.tip-header {
    font-size: 0.85rem;
    font-weight: 700;
    color: #b45309;
    margin-bottom: 8px;
}

[data-theme="dark"] .tip-header {
    color: #fbbf24;
}

.tip-box p {
    color: #92400e;
    margin: 0;
    font-size: 0.95rem;
}

[data-theme="dark"] .tip-box p {
    color: #fcd34d;
}

/* Grammar Table */
.grammar-table {
    margin: 20px 0;
    overflow-x: auto;
}

.grammar-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
}

.grammar-table th,
.grammar-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--card-border);
}

.grammar-table th {
    background: var(--light-gray);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grammar-table td {
    color: var(--text-secondary);
}

.grammar-table tr:last-child td {
    border-bottom: none;
}

.grammar-table .jp {
    font-weight: 500;
    color: var(--text-primary);
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.comparison-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
}

.comparison-card h3 {
    font-size: 1.1rem;
    margin: 0 0 8px;
    color: var(--text-primary);
}

.comparison-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0 0 12px;
}

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

.comparison-card li {
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-size: 0.95rem;
}

/* Practice Dialogue */
.practice-dialogue {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.dialogue-line {
    padding: 10px 0;
    border-bottom: 1px dashed var(--card-border);
}

.dialogue-line:last-child {
    border-bottom: none;
}

.dialogue-line .jp {
    display: block;
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.dialogue-line .translation {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Lesson Navigation */
.lesson-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--card-border);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    text-decoration: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.nav-link:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

.nav-prev {
    justify-content: flex-start;
}

.nav-next {
    justify-content: flex-end;
    text-align: right;
}

.nav-link i {
    font-size: 1.2rem;
    color: var(--accent);
}

.nav-link-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-placeholder {
    visibility: hidden;
}

/* Responsive */
@media (max-width: 768px) {
    .grammar-header h1 {
        font-size: 1.8rem;
    }

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

    .lesson-header h1 {
        font-size: 1.5rem;
    }

    .grammar-section h2 {
        font-size: 1.25rem;
    }

    .lesson-navigation {
        grid-template-columns: 1fr;
    }

    .nav-prev {
        order: 2;
    }

    .nav-next {
        order: 1;
        justify-content: flex-start;
        text-align: left;
    }

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

    .grammar-table {
        font-size: 0.9rem;
    }

    .grammar-table th,
    .grammar-table td {
        padding: 10px 12px;
    }
}