/* ==========================================================================
   TapeOut 生态导航 —— 全部样式
   配色：浅薰衣草底 + 纯白圆角卡片 + 紫调点缀，掺一点「链上硅片」的方格底纹
   ========================================================================== */

:root {
  --sidebar-w: 224px;

  --bg: #f4f3fa;
  --surface: #ffffff;
  --surface-soft: #fafafd;
  --line: #e8e6f2;
  --line-soft: #f0eef7;

  --ink: #15132c;
  --ink-2: #47446a;
  --ink-3: #8b88a6;

  --accent: #5b4be0;
  --accent-2: #7c6bff;
  --accent-soft: #eeebff;
  --cyan: #14a8bd;
  --hot: #f0466b;

  --r-lg: 20px;
  --r-md: 13px;

  --sh-1: 0 1px 2px rgba(21, 19, 44, .04), 0 6px 16px -12px rgba(21, 19, 44, .18);
  --sh-2: 0 2px 5px rgba(21, 19, 44, .05), 0 16px 32px -20px rgba(21, 19, 44, .3);
  --sh-3: 0 22px 48px -28px rgba(30, 24, 80, .3), 0 2px 6px rgba(21, 19, 44, .04);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "HarmonyOS Sans SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .68, .28, 1);
}

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

[hidden] { display: none !important; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink);
  background:
    radial-gradient(820px 460px at 10% -8%, #e9e4ff 0%, rgba(233, 228, 255, 0) 62%),
    radial-gradient(700px 410px at 98% 2%, #e0f4f8 0%, rgba(224, 244, 248, 0) 58%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 硅片方格底纹，只在页面上方淡淡透出 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(91, 75, 224, .05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(91, 75, 224, .05) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(940px 520px at 50% 0%, #000 0%, transparent 76%);
          mask-image: radial-gradient(940px 520px at 50% 0%, #000 0%, transparent 76%);
}

::selection { background: rgba(124, 107, 255, .22); }

a { color: inherit; }

.ico { width: 1em; height: 1em; display: block; flex: none; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 99;
  padding: 8px 14px; border-radius: 0 0 10px 0;
  background: var(--accent); color: #fff; text-decoration: none;
}
.skip:focus { left: 0; }

/* ── 布局 ────────────────────────────────────────────────── */

.app, .sidebar, .main { position: relative; }
.main { z-index: 1; }

/* ── 侧栏 ────────────────────────────────────────────────── */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  padding: 16px 11px 13px;
  background: rgba(255, 255, 255, .74);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 7px 0;
  text-decoration: none;
}
.brand__mark {
  width: 32px; height: 32px;
  flex: none;
  display: grid; place-items: center;
  border-radius: 10px;
  font-size: 18px;
  color: #fff;
  background: linear-gradient(140deg, var(--accent-2), #4a3ad0);
  box-shadow: 0 6px 14px -7px rgba(91, 75, 224, .8);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__text b {
  font-size: 14.5px; font-weight: 700; letter-spacing: -.01em; line-height: 1.25;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.brand__text small {
  font-family: var(--mono);
  font-size: 9.5px; letter-spacing: .02em; color: var(--ink-3);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.side-label {
  margin: 18px 9px 6px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.nav {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-right: 2px;
  scrollbar-width: thin;
}

.nav__item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 9px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  font: inherit;
  font-size: 12.5px;
  color: var(--ink-2);
  text-align: left;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease);
}
.nav__item:hover { background: #f2f0fb; color: var(--ink); }
.nav__item .ico { font-size: 15px; color: var(--ink-3); transition: color .18s var(--ease); }
.nav__item span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav__item b {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--ink-3);
  background: #f0eef8;
  border-radius: 999px;
  padding: 2px 6px;
  transition: inherit;
}
.nav__item.is-active { background: var(--accent-soft); color: var(--accent); }
.nav__item.is-active .ico { color: var(--accent); }
.nav__item.is-active b { background: rgba(91, 75, 224, .13); color: var(--accent); }
.nav__item.is-active::before {
  content: "";
  position: absolute; left: -11px; top: 50%;
  width: 3px; height: 16px;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
  transform: translateY(-50%);
}

.side-foot { padding: 10px 3px 0; border-top: 1px solid var(--line-soft); }
.side-total {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px;
  border-radius: 10px;
  background: linear-gradient(140deg, #f3f0ff, #eef7fa);
  font-size: 11px;
  color: var(--ink-2);
}
.side-total b { font-family: var(--mono); font-size: 13.5px; font-weight: 700; color: var(--accent); }
.side-note {
  margin: 8px 3px 0;
  font-size: 10px;
  line-height: 1.5;
  color: var(--ink-3);
}

/* ── 遮罩（移动端抽屉） ──────────────────────────────────── */

.scrim {
  position: fixed; inset: 0; z-index: 25;
  background: rgba(21, 19, 44, .34);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .26s var(--ease), visibility .26s;
}
body.nav-open .scrim { opacity: 1; visibility: visible; }

/* ── 主区 ────────────────────────────────────────────────── */

.main { margin-left: var(--sidebar-w); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  background: rgba(247, 246, 252, .8);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  border-bottom: 1px solid rgba(232, 230, 242, .9);
}

.icon-btn {
  display: grid; place-items: center;
  width: 32px; height: 32px;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 15px;
  cursor: pointer;
  transition: border-color .18s, color .18s, background .18s;
}
.icon-btn:hover { border-color: #d7d1f5; color: var(--accent); }
.topbar__menu { display: none; }

.search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  margin: 0;              /* 关于页用 <form> 承载，清掉表单默认外边距 */
  max-width: 400px;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, .86);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.search:focus-within {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(124, 107, 255, .13);
}
.search__icon { font-size: 15px; color: var(--ink-3); }
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: none;
  font: inherit;
  font-size: 13px;
  color: var(--ink);
}
.search input::placeholder { color: var(--ink-3); }
.search input::-webkit-search-cancel-button { display: none; }
.search__kbd {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-soft);
}
.search__clear { width: 22px; height: 22px; border: 0; background: none; font-size: 13px; }
.search__clear:hover { color: var(--hot); }

.lang {
  display: flex;
  gap: 2px;
  margin-left: auto;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, .86);
}
.lang button {
  min-width: 38px;
  padding: 4px 8px;
  border: 0;
  border-radius: 7px;
  background: none;
  font: inherit;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-3);
  cursor: pointer;
  transition: background .18s, color .18s;
}
.lang button:hover { color: var(--ink); }
.lang button.is-on { background: var(--accent); color: #fff; }

.content {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px 44px;
}

/* ── Hero ────────────────────────────────────────────────── */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 24px;
  padding: 26px 28px;
  border: 1px solid rgba(255, 255, 255, .9);
  border-radius: var(--r-lg);
  background:
    radial-gradient(580px 320px at 4% -10%, #ffffff 0%, rgba(255, 255, 255, 0) 62%),
    linear-gradient(142deg, #ffffff 0%, #f6f3ff 48%, #eaf6f9 100%);
  box-shadow: var(--sh-3);
  overflow: hidden;
}
/* 右上角的电路走线点缀 */
.hero::after {
  content: "";
  position: absolute;
  top: -34px; right: -26px;
  width: 260px; height: 190px;
  background-image:
    linear-gradient(to right, rgba(91, 75, 224, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(91, 75, 224, .16) 1px, transparent 1px);
  background-size: 18px 18px;
  -webkit-mask-image: radial-gradient(closest-side, #000, transparent);
          mask-image: radial-gradient(closest-side, #000, transparent);
  pointer-events: none;
}

.hero__left { position: relative; z-index: 1; min-width: 0; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px 5px 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .9);
  border: 1px solid rgba(124, 107, 255, .24);
  box-shadow: 0 5px 13px -10px rgba(91, 75, 224, .7);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
}
.hero__badge i {
  display: grid; place-items: center;
  width: 18px; height: 18px;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 11px; font-style: normal;
}

.hero__eyebrow {
  margin: 15px 0 4px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--cyan);
}

.hero h1 {
  margin: 0;
  font-size: clamp(24px, 3.1vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.035em;
  overflow-wrap: anywhere;
}
[data-lang="en"] .hero h1 { letter-spacing: -.03em; }

.hero__lead {
  max-width: 46ch;
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-2);
}

.hero__pills { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.hero__pills button {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .8);
  font: inherit; font-size: 11.5px; font-weight: 600;
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color .18s, color .18s, transform .18s var(--ease);
}
.hero__pills button:hover { border-color: var(--accent-2); color: var(--accent); transform: translateY(-1px); }
.hero__pills .ico { font-size: 13px; color: var(--accent); }

/* Hero 右侧卡片：min-width 必须归零，否则栅格轨道会被 min-content 撑开 */
.hero__side { position: relative; z-index: 1; min-width: 0; display: flex; flex-direction: column; gap: 11px; }
/* 右侧只剩「热门推荐」一张卡，让它撑满高度、列表项均分剩余空间 */
.hero__side .panel { display: flex; flex-direction: column; }
.hero__side > .panel { flex: 1; }
.hero__side .panel .hot { flex: 1 1 auto; }

.panel {
  padding: 13px 14px;
  border: 1px solid rgba(232, 230, 242, .95);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .9);
  box-shadow: var(--sh-1);
}
.panel__head {
  display: flex; align-items: center; gap: 7px;
  margin-bottom: 9px;
}
.panel__head b { font-size: 12px; font-weight: 700; }
.panel__head .ico { font-size: 13.5px; color: var(--accent); }
.panel__head em {
  margin-left: auto;
  font-family: var(--mono); font-style: normal;
  font-size: 10px; color: var(--ink-3);
}

.hot {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 7px;
  margin: 0 -7px;
  border-radius: 8px;
  text-decoration: none;
  transition: background .18s;
}
.hot:hover { background: #f5f3fe; }
.hot__ico {
  width: 26px; height: 26px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  overflow: hidden;
}
.hot__ico img { width: 15px; height: 15px; object-fit: contain; }
.hot__ico span, .hot__ico .ico-letter { font-size: 12px; font-weight: 700; }
.hot__body { min-width: 0; }
.hot__body b { display: block; font-size: 12px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hot__body small { display: block; font-size: 10.5px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 没有 hot 站点时右侧为空，Hero 收成单栏 */
.hero.is-solo { grid-template-columns: minmax(0, 1fr); }

/* ── 分类区块 ────────────────────────────────────────────── */

.sec { margin-top: 30px; scroll-margin-top: 62px; }
/* 仅在 JS 就绪时才隐藏待入场，避免脚本失效导致内容不可见 */
html.js .sec { opacity: 0; }
.sec.in { animation: rise .5s var(--ease) both; }

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

.sec__head { display: flex; align-items: center; gap: 9px; margin-bottom: 11px; }

.sec__icon {
  width: 28px; height: 28px; flex: none;
  display: grid; place-items: center;
  border-radius: 9px;
  font-size: 15px;
  color: var(--accent);
  background: var(--accent-soft);
}
.sec__title { margin: 0; min-width: 0; font-size: 15.5px; font-weight: 700; letter-spacing: -.01em; }
.sec__count {
  font-family: var(--mono);
  font-size: 10.5px; font-weight: 600;
  color: var(--ink-3);
  background: #efeef7;
  border-radius: 999px;
  padding: 2px 8px;
}
.sec__more {
  display: inline-flex; align-items: center; gap: 5px;
  margin-left: auto;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font: inherit; font-size: 11.5px; font-weight: 600;
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color .18s, color .18s;
}
.sec__more:hover { border-color: var(--accent-2); color: var(--accent); }
.sec__more span { font-family: var(--mono); font-size: 10px; color: var(--ink-3); }
.sec__more:hover span { color: var(--accent-2); }

.grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 11px; }

/* ── 站点卡片 ────────────────────────────────────────────── */

.card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 30px 12px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: var(--sh-1);
  text-decoration: none;
  overflow: hidden;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}
.card::before {
  content: "";
  position: absolute; inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(var(--accent-2), var(--cyan));
  opacity: 0;
  transition: opacity .22s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: #d5cff6;
  box-shadow: var(--sh-2);
}
.card:hover::before { opacity: 1; }

.card__ico {
  width: 34px; height: 34px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  overflow: hidden;
}
.card__ico img { width: 19px; height: 19px; object-fit: contain; }
.card__ico .ico-letter {
  width: 100%; height: 100%;
  display: grid; place-items: center;
  font-size: 14px; font-weight: 700;
  background: hsl(var(--h, 250) 68% 94%);
  color: hsl(var(--h, 250) 55% 42%);
}
.card__ico span:not(.ico-letter) { font-size: 17px; }

.card__body { min-width: 0; flex: 1; }
.card__name {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 650;
  letter-spacing: -.005em;
}
.card__name > span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card__desc {
  margin: 4px 0 0;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--ink-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.badge-hot {
  flex: none;
  padding: 2px 5px;
  border-radius: 5px;
  background: linear-gradient(135deg, #ff7d99, var(--hot));
  font-family: var(--mono);
  font-size: 9px; font-weight: 700; letter-spacing: .06em;
  color: #fff;
}

.card__go {
  position: absolute;
  top: 12px; right: 11px;
  font-size: 12px;
  color: var(--accent-2);
  opacity: 0;
  transform: translate(-3px, 3px);
  transition: opacity .22s var(--ease), transform .22s var(--ease);
}
.card:hover .card__go { opacity: 1; transform: none; }

/* ── 空状态 & 页脚 ───────────────────────────────────────── */

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  margin-top: 44px;
  padding: 40px 20px;
  border: 1px dashed #ddd8f0;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .6);
  text-align: center;
}
.empty__ico {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  margin-bottom: 5px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 18px;
}
.empty b { font-size: 13.5px; }
.empty small { font-size: 12px; color: var(--ink-3); }

.foot {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--ink-3);
}

/* 挨着版权排，不要用 margin-left:auto 顶到最右，否则视觉上跟版权脱节 */
.foot__link { color: var(--ink-2); font-weight: 600; text-decoration: none; }
.foot__link::before { content: "·"; margin-right: 6px; color: var(--ink-3); font-weight: 400; }
.foot__link:hover { color: var(--accent); }

/* ── 关于我们 ────────────────────────────────────────────── */

.crumb {
  display: flex; align-items: center; gap: 7px;
  margin-bottom: 14px;
  font-size: 11.5px;
  color: var(--ink-3);
}
.crumb a { text-decoration: none; }
.crumb a:hover { color: var(--accent); }
.crumb__sep { opacity: .5; }

.about { display: flex; flex-direction: column; gap: 13px; }

.about__hero { padding: 22px 20px 10px; text-align: center; }
.about__mark {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  margin: 0 auto 14px;
  border-radius: 17px;
  font-size: 29px;
  color: #fff;
  background: linear-gradient(140deg, var(--accent-2), #4a3ad0);
  box-shadow: 0 14px 30px -14px rgba(91, 75, 224, .9);
}
.about__hero h1 { margin: 0; font-size: 29px; font-weight: 800; letter-spacing: -.03em; }
.about__hero p { max-width: 54ch; margin: 10px auto 0; font-size: 13px; line-height: 1.7; color: var(--ink-2); }

.about__block { padding: 20px 22px; }
.about__block h2 { margin: 0 0 9px; font-size: 15.5px; font-weight: 700; }
.about__block p { margin: 0; font-size: 12.5px; line-height: 1.8; color: var(--ink-2); }

.about__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.feature { padding: 16px 18px; }
.feature__ico {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  margin-bottom: 10px;
  border-radius: 10px;
  font-size: 16px;
  color: var(--accent);
  background: var(--accent-soft);
}
.feature h3 { margin: 0 0 5px; font-size: 13px; font-weight: 700; }
.feature p { margin: 0; font-size: 11.5px; line-height: 1.75; color: var(--ink-3); }

.contact-link {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 14px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  box-shadow: var(--sh-1);
  font-size: 12.5px; font-weight: 600;
  color: var(--ink-2);
  text-decoration: none;
  transition: border-color .18s, color .18s, transform .18s var(--ease);
}
.contact-link:hover { border-color: var(--accent-2); color: var(--accent); transform: translateY(-1px); }
.contact-link svg { width: 15px; height: 15px; flex: none; }

/* 内页正文的内联双语文案：只做隐藏，不覆盖元素自身的 display */
html[data-lang="zh"] .content .l-en,
html[data-lang="en"] .content .l-zh { display: none; }

.is-hide { display: none !important; }
.card.is-cut { display: none; }

/* ── 响应式 ──────────────────────────────────────────────── */

@media (max-width: 1180px) {
  .hero { grid-template-columns: minmax(0, 1fr) 264px; gap: 20px; padding: 22px 24px; }
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1000px) {
  .sidebar {
    transform: translateX(-102%);
    box-shadow: 22px 0 52px -28px rgba(21, 19, 44, .4);
    transition: transform .3s var(--ease);
  }
  body.nav-open .sidebar { transform: none; }
  .main { margin-left: 0; }
  .topbar__menu { display: grid; }
  .topbar { padding: 9px 16px; }
  .content { padding: 16px 16px 40px; }
  .hero { grid-template-columns: minmax(0, 1fr); padding: 20px 18px; border-radius: 18px; }
  .hero::after { opacity: .6; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .search { max-width: none; }
}

@media (max-width: 620px) {
  .grid { grid-template-columns: 1fr; }
  .about__grid { grid-template-columns: 1fr; }
  .about__block { padding: 16px 16px; }
  .about__hero { padding: 12px 4px 6px; }
  .about__hero h1 { font-size: 25px; }
  .search__kbd { display: none; }
  .lang button { min-width: 32px; padding: 4px 6px; }
  .sec { margin-top: 26px; }
  .foot { font-size: 10.5px; }
}

/* 尊重系统的「减少动态效果」设置 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js .sec { opacity: 1; }
}