/*
Theme Name: CaelLab
Theme URI: https://caellab.org/
Author: CaelLab
Description: 虚舟实验室团队官网主题。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 7.1
Requires PHP: 7.4
License: GPL-3.0-or-later
License URI: https://www.gnu.org/licenses/gpl-3.0.html
Text Domain: caellab
*/

:root {
    --bg: #f7f5f2;
    --surface: #fffdfb;
    --surface-alt: #f1eee9;
    --ink: #1d172b;
    --muted: #6b6478;
    --faint: #98919f;
    --line: #e3ded7;
    --line-soft: #ebe7e1;
    --brand: #4e338f;
    --brand-hover: #3f2875;
    --rose: #c73572;
    --radius: 12px;
    --radius-lg: 16px;
    --mono: "SF Mono", "Cascadia Code", Consolas, monospace;
    --max: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    padding: 10px 16px;
    background: var(--ink);
    color: var(--bg);
    z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 页头 ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(247, 245, 242, 0.9);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--line-soft);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    height: 64px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 15px;
    letter-spacing: -0.01em;
    white-space: nowrap;
}
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.brand small {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: var(--faint);
}

.header-nav { display: flex; align-items: center; gap: 22px; margin-left: auto; }
.header-nav a { font-size: 14.5px; color: var(--muted); }
.header-nav a:hover { color: var(--ink); }
.header-nav .is-current { color: var(--ink); font-weight: 600; }

.header-nav .nav-cta {
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--ink);
    color: var(--bg);
    font-size: 14px;
}
.header-nav .nav-cta:hover { background: var(--brand); color: #fff; }

/* ---------- 语言下拉 ---------- */

.lang-menu { position: relative; font-family: var(--mono); font-size: 12px; }

.lang-menu summary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    cursor: pointer;
    list-style: none;
    transition: border-color 0.2s, color 0.2s;
}
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu summary:hover { border-color: var(--ink); color: var(--ink); }
.lang-menu[open] summary { border-color: var(--ink); color: var(--ink); }

.icon-globe-sm {
    width: 13px;
    height: 13px;
    border: 1.4px solid currentColor;
    border-radius: 50%;
    position: relative;
    display: inline-block;
}
.icon-globe-sm::before,
.icon-globe-sm::after {
    content: "";
    position: absolute;
    left: 1px;
    right: 1px;
    top: 50%;
    height: 1px;
    background: currentColor;
    opacity: 0.7;
}
.icon-globe-sm::after {
    top: 3px;
    bottom: 3px;
    left: 50%;
    right: auto;
    width: 1px;
    height: auto;
    transform: translateX(-50%);
}

.lang-list {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 50;
    min-width: 216px;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    margin: 0;
    padding: 6px;
    list-style: none;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    box-shadow: 0 16px 36px -20px rgba(29, 23, 43, 0.4);
}

.lang-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 8px 10px;
    border-radius: 6px;
    color: var(--muted);
    white-space: nowrap;
}
.lang-list a:hover { background: var(--surface-alt); color: var(--ink); }
.lang-list a.is-current { color: var(--ink); }
.lang-list a.is-current::after { content: "✓"; color: var(--brand); }
.lang-code { flex: none; color: var(--faint); font-family: var(--mono); font-size: 11px; }
.lang-list a.is-current .lang-code { color: var(--brand); }

/* ---------- 首屏 ---------- */

.hero { padding: 76px 0 72px; }

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: 56px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 18px;
    font-family: var(--mono);
    font-size: 11.5px;
    letter-spacing: 0.08em;
    color: var(--muted);
}
.eyebrow::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--rose);
}

.hero h1 {
    margin: 0 0 18px;
    font-size: clamp(32px, 4.6vw, 50px);
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero-lede { margin: 0; max-width: 30em; color: var(--muted); font-size: 16.5px; }

.hero-media { margin: 0; }
.hero-media img,
.hero-media .hero-video {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

/* ---------- 区块 ---------- */

.section { padding: 76px 0; }
.section-alt { background: var(--surface-alt); border-block: 1px solid var(--line-soft); }

.kicker {
    margin: 0 0 10px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--brand);
}

.section h2 {
    margin: 0 0 28px;
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 800;
    letter-spacing: -0.015em;
}

.section-lede { margin: -16px 0 32px; color: var(--muted); max-width: 40em; }

/* ---------- 我们在做什么 ---------- */

.what-we-do {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 56px;
    align-items: center;
}

.what-we-do h2 { margin-bottom: 20px; }

.what-we-do-copy p {
    margin: 0 0 16px;
    max-width: 34em;
    color: var(--muted);
    font-size: 16.5px;
}

.what-we-do-link { color: var(--ink) !important; }
.what-we-do-link a {
    color: var(--brand);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.what-we-do-art { margin: 0; }
.what-we-do-art img { width: 100%; height: auto; opacity: 0.75; }

/* ---------- 支持 ---------- */

.support-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 48px;
    align-items: center;
}
.support-row .stance p { max-width: 32em; }
.support-art { margin: 0; }
.support-art img { width: 100%; height: auto; opacity: 0.7; }

/* ---------- 公示 ---------- */

.public-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.public-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 18px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    transition: border-color 0.2s, transform 0.2s;
}
.public-item:hover { border-color: var(--brand); transform: translateY(-1px); }

.public-title { font-size: 15px; font-weight: 600; }
.public-desc { font-size: 13px; color: var(--faint); line-height: 1.6; }

/* ---------- 文章卡 ---------- */

.post-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }

.post-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s;
}
.post-card:hover { border-color: var(--brand); transform: translateY(-2px); }

.post-thumb { aspect-ratio: 16 / 10; background: var(--surface-alt); overflow: hidden; }
.post-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.post-thumb:empty { display: none; }

.post-body { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 8px; flex: 1; }

.post-meta {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: 0.05em;
    color: var(--faint);
}

.post-title { margin: 0; font-size: 17px; line-height: 1.45; font-weight: 700; }

.post-excerpt {
    margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.65;
    display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
}

/* ---------- 立场 / 联系 ---------- */

.stance { max-width: 720px; }
.stance p { margin: 0 0 16px; font-size: 17px; line-height: 1.85; color: var(--muted); }
.stance p:first-of-type { font-size: 21px; line-height: 1.7; color: var(--ink); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--surface);
    font-size: 14.5px;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn-primary { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.btn-primary:hover { background: var(--brand); border-color: var(--brand); color: #fff; }

/* ---------- 内页 ---------- */

.page-head { padding: 64px 0 8px; }
.page-head .wrap, .page-body { max-width: 800px; }
.page-head h1 {
    margin: 0 0 12px;
    font-size: clamp(28px, 3.6vw, 40px);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.page-head p { margin: 0; color: var(--muted); }

.page-body { padding: 36px 24px 84px; }
.page-body h2 { margin: 40px 0 12px; font-size: 20px; font-weight: 700; }
.page-body h3 { margin: 28px 0 10px; font-size: 17px; font-weight: 700; }
.page-body p { margin: 0 0 16px; }
.page-body ul, .page-body ol { margin: 0 0 16px; padding-left: 1.3em; }
.page-body li { margin-bottom: 6px; }
.page-body a { color: var(--brand); text-decoration: underline; text-underline-offset: 2px; }
.page-body figure { margin: 34px 0; }
.page-body figure img { width: 100%; height: auto; border-radius: var(--radius); display: block; }
.page-body figcaption { margin-top: 10px; font-size: 12.5px; line-height: 1.7; color: var(--faint); }
.page-body figure img[src$=".svg"] { width: 240px; margin: 0 auto; opacity: 0.75; }
.page-body blockquote {
    margin: 24px 0;
    padding: 4px 0 4px 20px;
    border-left: 2px solid var(--line);
    color: var(--muted);
}
.page-body code {
    font-family: var(--mono);
    font-size: 13px;
    background: var(--surface-alt);
    padding: 2px 6px;
    border-radius: 5px;
}

.entry-head { padding: 56px 0 0; }
.entry-head h1 { margin: 10px 0 0; font-size: clamp(26px, 3.4vw, 38px); line-height: 1.3; letter-spacing: -0.02em; }

.post-list { display: grid; gap: 0; }
.post-row {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0;
    border-top: 1px solid var(--line-soft);
}
.post-row time { font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.04em; }
.post-row h2 { margin: 0 0 4px; font-size: 18px; font-weight: 700; }
.post-row p { margin: 0; font-size: 13.5px; color: var(--muted); }

/* ---------- 页脚 ---------- */

.site-footer {
    padding: 56px 0 40px;
    border-top: 1px solid var(--line);
    font-size: 12.5px;
    color: var(--faint);
    line-height: 1.9;
}
.footer-top {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 28px;
    align-items: baseline;
    margin-bottom: 22px;
}
.footer-top .brand { font-size: 14px; color: var(--ink); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-nav a { color: var(--muted); }
.footer-legal p { margin: 0 0 8px; }
.footer-legal a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
    .hero-inner { grid-template-columns: 1fr; gap: 32px; }
    .hero-media img { aspect-ratio: 16 / 10; }
    .post-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .what-we-do, .support-row { grid-template-columns: 1fr; gap: 32px; }
    .what-we-do-art { max-width: 320px; }
    .header-nav { gap: 16px; }
}

@media (max-width: 680px) {
    .hero { padding: 48px 0 40px; }
    .section { padding: 52px 0; }
    .post-grid, .public-grid { grid-template-columns: 1fr; }
    .header-inner { gap: 12px; }
    .header-nav { gap: 12px; }
    .header-nav > a:not(.nav-cta) { display: none; }
    .brand { font-size: 14px; }
    .lang-menu { font-size: 11px; }
    .lang-menu summary { height: 30px; padding: 0 10px; }
    .post-row { grid-template-columns: 1fr; gap: 6px; }
    .wrap { padding: 0 18px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* ---------- 分页 ---------- */

.pagination { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 0; }
.pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 13px;
    color: var(--muted);
}
.pagination .page-numbers:hover { border-color: var(--ink); color: var(--ink); }
.pagination .current { background: var(--ink); border-color: var(--ink); color: var(--bg); }