/* ═══════════════════════════════════════════════════════════════
   小框日记 — 面向搜索的内容页布局（/features/<slug>）

   配色、圆角、阴影、字体一律取主题变量（frontend/themes/*.css 里按
   [data-theme] 定义的那一套），本文件不硬编码任何颜色/圆角/字体，
   因此在三套主题之间切换时页面会整体跟随。
   ═══════════════════════════════════════════════════════════════ */

.landing {
    max-width: 880px;
    margin: 0 auto;
    padding: 24px 20px 64px;
    min-height: 100vh;
}

/* ── 顶栏 ───────────────────────────────────────────────────── */
.landing-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 30px;
}
.landing-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: auto;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}
.landing-brand span {
    font-size: 13px;
    font-weight: 400;
    color: var(--text-muted);
}
.landing-nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}
.landing-nav-links a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
}
.landing-nav-links a:hover {
    color: var(--accent);
    text-decoration: underline;
}
.landing-nav-actions {
    display: flex;
    gap: 8px;
}

/* ── 正文 ───────────────────────────────────────────────────── */
.landing h1 {
    font-size: 26px;
    line-height: 1.4;
    margin: 0 0 12px;
    color: var(--text);
}
.landing h2 {
    font-size: 19px;
    line-height: 1.5;
    margin: 0 0 10px;
    color: var(--text);
}
.landing h3 {
    font-size: 16px;
    margin: 0 0 6px;
    color: var(--text);
}
.landing-lead {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 0 0 26px;
}
.landing-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 22px 24px;
    margin-bottom: 18px;
}
.landing-section p {
    margin: 0 0 10px;
    line-height: 1.85;
    color: var(--text-secondary);
}
.landing-section p:last-child {
    margin-bottom: 0;
}
.landing-section ul {
    margin: 0 0 10px;
    padding-left: 20px;
    line-height: 1.9;
    color: var(--text-secondary);
}
.landing-section li {
    margin-bottom: 4px;
}
.landing-section strong {
    color: var(--text);
}

/* ── 常见问题（正文与页面内嵌的结构化数据一一对应）──────────── */
.landing-faq {
    margin: 30px 0 10px;
}
.landing-faq details {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 10px;
}
.landing-faq summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text);
}
.landing-faq details p {
    margin: 10px 0 0;
    line-height: 1.85;
    color: var(--text-secondary);
}

/* ── 行动区与相关页面 ───────────────────────────────────────── */
.landing-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 28px 0;
}
.landing-related ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.landing-related a {
    display: block;
    padding: 14px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    text-decoration: none;
    transition: border-color 0.2s, background 0.2s;
}
.landing-related a:hover {
    border-color: var(--accent);
    background: var(--surface-hover);
}
.landing-related span {
    display: block;
    margin-top: 4px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ── 页脚 ───────────────────────────────────────────────────── */
.landing-footer {
    margin-top: 40px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 13px;
    line-height: 2;
    color: var(--text-muted);
}
.landing-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}
.landing-footer a:hover {
    color: var(--accent);
    text-decoration: underline;
}
.landing-footer .landing-footer-links {
    margin-bottom: 4px;
}
.landing-footer .site-icp {
    padding: 4px 0 0;
}

@media (max-width: 640px) {
    .landing {
        padding: 18px 14px 48px;
    }
    .landing h1 {
        font-size: 22px;
    }
    .landing-section {
        padding: 18px 16px;
    }
    .landing-brand {
        width: 100%;
    }
}