/* 功能使用指南页 (feature_guide.css) */

/* ── 左右栏布局 ── */
.fg-hero-wrap {
    margin-bottom: 0;
}

.fg-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: stretch;
    max-width: 1180px;
    margin: 0 auto;
    min-height: 420px;
    border-top: 1px solid var(--border-color);
}

.fg-sidebar {
    border-right: 1px solid var(--border-color);
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    align-self: start;
    max-height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.fg-sidebar-inner {
    display: flex;
    flex-direction: column;
    max-height: 100vh;
    overflow: hidden;
}

.fg-sidebar-head {
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.fg-sidebar-back {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    color: var(--primary-color);
    text-decoration: none;
    margin-bottom: 6px;
}

.fg-sidebar-back:hover {
    text-decoration: underline;
}

.fg-sidebar-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.fg-nav {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0 12px;
}

.fg-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.fg-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.fg-nav-item:hover {
    background: rgba(99, 102, 241, 0.06);
    color: var(--text-primary);
}

.fg-nav-item.is-active {
    background: rgba(99, 102, 241, 0.1);
    color: #6366f1;
    border-left-color: #6366f1;
    font-weight: 600;
}

.fg-nav-icon {
    font-size: 1rem;
    flex-shrink: 0;
    opacity: 0.85;
}

.fg-nav-label {
    line-height: 1.35;
}

.fg-main {
    min-width: 0;
    background: var(--card-bg);
}

.fg-main-inner {
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-2xl);
}

.fg-mobile-bar {
    display: none;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.fg-menu-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text-primary);
}

.fg-mobile-cur {
    font-size: 0.85rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.fg-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 199;
}

.fg-overlay.is-visible {
    display: block;
}

/* ── 索引预览区 ── */
.fg-preview {
    max-width: 720px;
}

.fg-preview-header {
    margin-bottom: var(--spacing-md);
}

.fg-preview-title {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.45;
    margin: 0 0 8px;
    color: var(--text-primary);
}

.fg-preview-meta {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.fg-preview-summary {
    font-size: 0.98rem;
    line-height: 1.85;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-lg);
}

.fg-preview-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: var(--spacing-md);
}

.fg-preview-hint {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin: 0;
    line-height: 1.6;
}

.fg-index-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

/* ── 文章详情 ── */
.fg-detail {
    max-width: 820px;
    margin: 0;
    padding: 0;
}

.fg-hero {    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.fg-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(99, 102, 241, 0.1);
    color: #6366f1;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.fg-hero-title {
    font-size: 1.55rem;
    font-weight: 700;
    line-height: 1.4;
    margin: 0 0 var(--spacing-sm);
    color: var(--text-primary);
}

.fg-hero-summary {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-md);
}

.fg-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.fg-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}

.fg-cta-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.fg-cta-btn--primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.fg-cta-btn--primary:hover {
    opacity: 0.92;
    color: #fff;
}

.fg-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.fg-section h2 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.fg-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    color: var(--text-primary);
}

.fg-section p {
    line-height: 1.85;
    color: var(--text-primary);
    margin: 0;
    font-size: 0.95rem;
}

.fg-example-scenario {
    margin-bottom: var(--spacing-md) !important;
    color: var(--text-secondary) !important;
}

.fg-table-wrap {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.fg-data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.fg-data-table th,
.fg-data-table td {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.fg-data-table th {
    background: var(--bg-secondary);
    font-weight: 600;
}

.fg-data-table td:first-child,
.fg-data-table th:first-child {
    text-align: left;
}

.fg-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.fg-metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.fg-metric-name {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.fg-metric-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.fg-metric-note {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}

.fg-insight {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.fg-insight strong {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
    color: #059669;
}

.fg-insight p {
    margin: 0;
    line-height: 1.8;
}

.fg-steps {
    margin: 0;
    padding-left: 1.25rem;
}

.fg-steps li {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.fg-steps li:last-child {
    margin-bottom: 0;
}

.fg-steps strong {
    display: block;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.fg-steps p {
    margin: 0;
    color: var(--text-secondary);
}

.fg-platforms {
    margin-top: var(--spacing-sm) !important;
    font-size: 0.9rem !important;
}

.fg-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: var(--spacing-lg);
}

.fg-tag {
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.fg-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.fg-footer-link {
    font-size: 0.9rem;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.fg-footer-link:hover {
    text-decoration: underline;
}

@media (max-width: 780px) {
    .fg-layout {
        grid-template-columns: 1fr;
    }

    .fg-sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        width: 240px;
        height: 100vh;
        z-index: 200;
        transition: left 0.25s ease;
        max-height: none;
    }

    .fg-sidebar.is-open {
        left: 0;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.12);
    }

    .fg-mobile-bar {
        display: flex;
    }

    .fg-main-inner {
        padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
    }

    .fg-hero-title {
        font-size: 1.3rem;
    }

    .fg-preview-title {
        font-size: 1.15rem;
    }

    .fg-metrics-grid {
        grid-template-columns: 1fr 1fr;
    }
}