/* ==========================================================================
   外贸AI库 waimaoaiku.com — 设计系统
   一处定义，全站复用。改色 / 改字 / 改间距都在这里。
   ========================================================================== */

:root {
  /* 品牌色 */
  --brand:        #4f46e5;   /* 靛蓝主色 */
  --brand-600:    #4338ca;
  --brand-700:    #3730a3;
  --brand-soft:   #eef2ff;   /* 主色超浅底 */
  --accent:       #06b6d4;   /* 青色点缀（AI 感） */
  --accent-soft:  #ecfeff;

  /* 中性 */
  --ink:          #0f172a;   /* 主文字 */
  --ink-2:        #334155;   /* 次级文字 */
  --muted:        #64748b;   /* 弱化文字 */
  --line:         #e2e8f0;   /* 描边 */
  --line-2:       #f1f5f9;
  --bg:           #ffffff;
  --bg-soft:      #f8fafc;
  --bg-ink:       #0b1020;   /* 深色区（页脚 / 反白区块） */

  /* 语义色 */
  --ok:           #16a34a;
  --ok-soft:      #f0fdf4;
  --warn:         #d97706;
  --danger:       #dc2626;

  /* 排版 */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", Consolas, Menlo, monospace;

  /* 尺寸 */
  --maxw: 1140px;
  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.05);
  --shadow:    0 6px 24px rgba(15,23,42,.08);
  --shadow-lg: 0 24px 60px rgba(15,23,42,.14);
  --grad: linear-gradient(120deg, var(--brand) 0%, var(--accent) 100%);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; color: var(--ink); font-weight: 760; letter-spacing: -.01em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); }
h2 { font-size: clamp(1.55rem, 2.2vw + .8rem, 2.3rem); }
h3 { font-size: 1.22rem; }
p  { margin: 0 0 1em; color: var(--ink-2); }
ul, ol { color: var(--ink-2); }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
code { font-family: var(--mono); font-size: .9em; background: var(--bg-soft); padding: .1em .4em; border-radius: 6px; border: 1px solid var(--line); }
::selection { background: var(--brand); color: #fff; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: 76px 0; }
.section-sm { padding: 48px 0; }
.section-soft { background: var(--bg-soft); }
.section-ink { background: var(--bg-ink); color: #cbd5e1; }
.section-ink h1, .section-ink h2, .section-ink h3 { color: #fff; }
.center { text-align: center; }
.eyebrow {
  display: inline-block; font-size: .82rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--brand); background: var(--brand-soft);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 16px;
}
.section-ink .eyebrow { color: #a5b4fc; background: rgba(99,102,241,.14); }
.lead { font-size: 1.16rem; color: var(--ink-2); max-width: 56ch; }
.center .lead { margin-left: auto; margin-right: auto; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.nowrap { white-space: nowrap; }

/* ---------- Buttons ---------- */
.btn {
  --b: var(--brand);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 680; font-size: 1rem; line-height: 1;
  padding: 14px 24px; border-radius: 11px; border: 1.5px solid transparent;
  cursor: pointer; transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
  text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--b); color: #fff; box-shadow: 0 6px 16px rgba(79,70,229,.28); }
.btn-primary:hover { background: var(--brand-600); box-shadow: 0 10px 24px rgba(79,70,229,.34); }
.btn-grad { background: var(--grad); color: #fff; box-shadow: 0 8px 22px rgba(79,70,229,.3); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn-ghost:hover { border-color: #c7cdd6; background: var(--bg-soft); }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: #1e293b; }
.btn-lg { padding: 17px 30px; font-size: 1.06rem; }
.btn-sm { padding: 9px 16px; font-size: .9rem; }
.btn-block { width: 100%; }
.btn[disabled], .btn.is-disabled { opacity: .55; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 24px; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.12rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .logo { width: 32px; height: 32px; }
.brand b { color: var(--brand); }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav-links a {
  color: var(--ink-2); font-weight: 560; font-size: .96rem; padding: 8px 12px; border-radius: 8px;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-soft); text-decoration: none; }
.nav-links a.active { color: var(--brand); }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: .2s; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 72px 0 64px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(60% 50% at 78% 8%, rgba(6,182,212,.10), transparent 60%),
    radial-gradient(55% 55% at 12% 0%, rgba(79,70,229,.12), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: center; }
.hero h1 { margin-bottom: .35em; }
.hero .lead { font-size: 1.22rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 18px; }
.hero-note { font-size: .92rem; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.hero-art { position: relative; }

/* ---------- Cards & grids ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm); transition: transform .15s ease, box-shadow .2s ease, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d8deea; }
.card h3 { margin-bottom: .4em; }
.card p:last-child { margin-bottom: 0; }
.card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); margin-bottom: 16px;
}
.card-icon svg { width: 24px; height: 24px; }

/* 库目录卡 */
.lib-card { display: flex; flex-direction: column; }
.lib-card .tag-row { margin-top: auto; padding-top: 14px; }
.module-list { list-style: none; padding: 0; margin: 10px 0 0; }
.module-list li { padding: 7px 0; border-top: 1px solid var(--line-2); font-size: .95rem; color: var(--ink-2); display: flex; gap: 10px; align-items: flex-start; }
.module-list li::before { content: "›"; color: var(--brand); font-weight: 800; }

/* ---------- Badges / chips ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: .8rem; font-weight: 650;
  padding: 4px 11px; border-radius: 999px; background: var(--bg-soft); color: var(--ink-2); border: 1px solid var(--line);
}
.chip-brand { background: var(--brand-soft); color: var(--brand-700); border-color: #dfe3ff; }
.chip-ok { background: var(--ok-soft); color: #15803d; border-color: #bbf7d0; }
.chip-lock { background: #fff7ed; color: #c2410c; border-color: #fed7aa; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Stat strip ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { text-align: center; padding: 8px; }
.stat .num { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 820; color: var(--ink); letter-spacing: -.02em; }
.stat .num b { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .lbl { color: var(--muted); font-size: .92rem; margin-top: 2px; }

/* ---------- Sample / data tables ---------- */
.data-table { width: 100%; border-collapse: collapse; font-size: .95rem; margin: 8px 0 4px; }
.data-table th, .data-table td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.data-table thead th { background: var(--bg-soft); color: var(--ink); font-weight: 700; font-size: .86rem; }
.data-table tbody tr:hover { background: var(--bg-soft); }
.data-table td b { color: var(--ink); }

.callout {
  border: 1px solid var(--line); border-left: 4px solid var(--brand); background: var(--brand-soft);
  border-radius: 10px; padding: 16px 20px; margin: 20px 0;
}
.callout.warn { border-left-color: var(--warn); background: #fffbeb; }
.callout.ok { border-left-color: var(--ok); background: var(--ok-soft); }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--ink); }

/* 锁定预览 */
.locked { position: relative; }
.locked .lock-overlay {
  position: absolute; inset: 0; display: grid; place-items: center; gap: 8px;
  background: linear-gradient(180deg, rgba(248,250,252,0) 0%, rgba(248,250,252,.86) 46%, rgba(248,250,252,.98) 100%);
  border-radius: var(--radius); text-align: center; padding: 20px;
}
.locked .lock-overlay .ico { width: 34px; height: 34px; color: var(--brand); }
.locked.clip { max-height: 360px; overflow: hidden; }

/* ---------- Pricing ---------- */
.price-toggle { display: inline-flex; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 4px; gap: 4px; margin: 8px auto 4px; }
.price-toggle button { font: inherit; font-weight: 650; font-size: .92rem; border: 0; background: transparent; color: var(--muted); padding: 8px 18px; border-radius: 999px; cursor: pointer; }
.price-toggle button.active { background: #fff; color: var(--ink); box-shadow: var(--shadow-sm); }
.price-toggle .save { color: var(--ok); font-size: .8rem; font-weight: 700; }

.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.plan {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px;
  display: flex; flex-direction: column; box-shadow: var(--shadow-sm); position: relative;
}
.plan.featured { border-color: var(--brand); box-shadow: var(--shadow-lg); transform: translateY(-6px); }
.plan.featured::before {
  content: "最受欢迎"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: .78rem; font-weight: 700; padding: 5px 14px; border-radius: 999px;
}
.plan h3 { font-size: 1.15rem; }
.plan .price { display: flex; align-items: baseline; gap: 4px; margin: 6px 0 2px; }
.plan .price .amt { font-size: 2.6rem; font-weight: 820; color: var(--ink); letter-spacing: -.02em; }
.plan .price .cur { font-size: 1.2rem; font-weight: 700; color: var(--ink); }
.plan .price .per { color: var(--muted); font-size: .95rem; }
.plan .price-sub { color: var(--muted); font-size: .9rem; min-height: 1.2em; }
.plan ul.feat { list-style: none; padding: 0; margin: 18px 0 24px; flex: 1; }
.plan ul.feat li { padding: 8px 0; border-top: 1px solid var(--line-2); display: flex; gap: 10px; align-items: flex-start; font-size: .96rem; color: var(--ink-2); }
.plan ul.feat li svg { flex: 0 0 18px; width: 18px; height: 18px; color: var(--ok); margin-top: 3px; }
.plan ul.feat li.off { color: var(--muted); }
.plan ul.feat li.off svg { color: var(--line); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer; font: inherit;
  font-weight: 680; font-size: 1.06rem; color: var(--ink); padding: 20px 44px 20px 0; position: relative;
}
.faq-q::after {
  content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 1.5rem; font-weight: 400; color: var(--brand); transition: transform .2s;
}
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .28s ease; }
.faq-a-inner { padding: 0 0 20px; color: var(--ink-2); }
.faq-a-inner p:last-child { margin-bottom: 0; }

/* ---------- Steps ---------- */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; }
.step .n {
  counter-increment: step; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); font-weight: 800; font-size: 1.1rem;
}
.step .n::before { content: counter(step); }
.step h3 { margin-bottom: .25em; }

/* ---------- Logos / trust row ---------- */
.trust-row { display: flex; flex-wrap: wrap; gap: 12px 26px; align-items: center; justify-content: center; }
.trust-row .chip { font-size: .85rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--bg-ink); color: #cbd5e1; border-radius: var(--radius-lg); padding: 52px 40px; text-align: center;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(50% 120% at 50% 0%, rgba(99,102,241,.32), transparent 60%);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { color: #fff; }
.cta-band .lead { color: #94a3b8; margin-left: auto; margin-right: auto; }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-ink); color: #94a3b8; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h4 { color: #e2e8f0; font-size: .92rem; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 14px; }
.site-footer a { color: #94a3b8; display: block; padding: 5px 0; font-size: .95rem; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.footer-brand .brand { color: #fff; margin-bottom: 12px; }
.footer-brand p { color: #94a3b8; font-size: .92rem; max-width: 34ch; }
.footer-bottom { border-top: 1px solid rgba(148,163,184,.18); margin-top: 40px; padding-top: 22px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; font-size: .86rem; color: #64748b; }
.footer-bottom a { display: inline; color: #94a3b8; }

/* ---------- Article (blog / legal) ---------- */
.article { max-width: 760px; margin: 0 auto; }
.article h1 { font-size: clamp(2rem, 3vw + .8rem, 3rem); line-height: 1.16; letter-spacing: -.02em; margin-bottom: .35em; }
.article h2 { margin-top: 2.1em; padding-top: .35em; scroll-margin-top: 92px; }
.article h3 { margin-top: 1.4em; }
.article p, .article li { font-size: 1.055rem; line-height: 1.82; }
.article ul, .article ol { padding-left: 1.3em; }
.article li { margin: .4em 0; }
.article blockquote { margin: 1.4em 0; padding: 4px 0 4px 20px; border-left: 4px solid var(--brand); color: var(--ink-2); font-style: normal; }
.article img { border-radius: var(--radius); border: 1px solid var(--line); margin: 1.4em 0; }
.article .meta { color: var(--muted); font-size: .92rem; margin-bottom: 1.4em; }
.breadcrumb { font-size: .9rem; color: var(--muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--brand); }

.article-enhanced { background: linear-gradient(180deg, #fff 0%, #f8fafc 100%); }
.article-enhanced .breadcrumb { display: none; }
.article-shell { display: grid; grid-template-columns: minmax(0, 760px) 240px; gap: 48px; align-items: start; }
.article-shell .article { margin: 0; }
.article-topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  margin: 0 0 18px; padding: 10px; border: 1px solid var(--line);
  border-radius: 14px; background: rgba(255,255,255,.86); box-shadow: var(--shadow-sm);
}
.article-back {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 12px; border-radius: 10px;
  background: var(--bg-soft); color: var(--ink); font-weight: 720; font-size: .92rem;
}
.article-back:hover { text-decoration: none; background: var(--brand-soft); color: var(--brand-700); }
.article-kicker { color: var(--muted); font-size: .86rem; font-weight: 650; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.article-aside { position: sticky; top: 92px; display: grid; gap: 14px; }
.article-panel {
  border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.9);
  box-shadow: var(--shadow-sm); padding: 14px;
}
.article-panel-title { margin: 0 0 10px; color: var(--ink); font-size: .86rem; font-weight: 780; }
.article-toc-list { display: grid; gap: 2px; margin: 0; padding: 0; list-style: none; }
.article-toc-list a {
  display: block; padding: 7px 9px; border-radius: 8px; color: var(--ink-2);
  font-size: .88rem; line-height: 1.35;
}
.article-toc-list a:hover { background: var(--bg-soft); color: var(--brand); text-decoration: none; }
.article-side-links { display: grid; gap: 8px; }
.article-side-links a {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px;
  background: #fff; color: var(--ink); font-weight: 680; font-size: .9rem;
}
.article-side-links a:hover { text-decoration: none; border-color: #c7d2fe; color: var(--brand); }
.article-mobile-toc { display: none; margin: 18px 0 24px; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.article-mobile-toc summary { cursor: pointer; padding: 13px 14px; color: var(--ink); font-weight: 760; }
.article-mobile-toc .article-toc-list { padding: 0 10px 12px; }
.article-progress { position: fixed; left: 0; top: 66px; z-index: 55; width: 100%; height: 2px; background: transparent; pointer-events: none; }
.article-progress span { display: block; width: 0; height: 100%; background: var(--grad); transition: width .08s linear; }
.article-mobile-actions { display: none; }

.post-card { display: flex; flex-direction: column; }
.post-card .thumb { border-radius: 10px; overflow: hidden; margin-bottom: 14px; border: 1px solid var(--line); }
.post-card h3 { font-size: 1.1rem; }
.post-card .meta { color: var(--muted); font-size: .85rem; margin-top: auto; padding-top: 12px; }

/* ---------- Misc ---------- */
.divider-soft { height: 1px; background: var(--line); border: 0; }
.kbd { font-family: var(--mono); font-size: .85em; background: var(--bg-ink); color: #e2e8f0; padding: 2px 7px; border-radius: 6px; }
.notice-bar { background: var(--grad); color: #fff; text-align: center; font-size: .9rem; font-weight: 600; padding: 9px 16px; }
.notice-bar a { color: #fff; text-decoration: underline; }
.anchor-offset { scroll-margin-top: 86px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-art { order: -1; max-width: 460px; }
  .price-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
  .plan.featured { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; }
  .article-shell { grid-template-columns: minmax(0, 760px); max-width: 820px; }
  .article-aside { display: none; }
  .article-mobile-toc { display: block; }
}
@media (max-width: 760px) {
  .section { padding: 56px 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px 12px; }
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 2px;
    position: absolute; top: 66px; left: 0; right: 0; background: #fff;
    border-bottom: 1px solid var(--line); padding: 12px 22px 18px; box-shadow: var(--shadow);
  }
  .nav.open .nav-links a { padding: 12px; border-radius: 8px; }
  .cta-band { padding: 40px 22px; }
  body.has-article-tools { padding-bottom: 68px; }
  .article h1 { font-size: clamp(1.75rem, 8vw, 2.35rem); }
  .article p, .article li { font-size: 1rem; line-height: 1.78; }
  .article-topbar { position: sticky; top: 78px; z-index: 12; justify-content: flex-start; margin-bottom: 16px; }
  .article-kicker { display: none; }
  .article-mobile-actions {
    position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 60;
    display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px;
    padding: 8px; border: 1px solid var(--line); border-radius: 16px;
    background: rgba(255,255,255,.94); backdrop-filter: blur(14px); box-shadow: var(--shadow-lg);
  }
  .article-mobile-actions a {
    display: flex; align-items: center; justify-content: center; min-height: 40px;
    border-radius: 11px; color: var(--ink); background: var(--bg-soft);
    font-size: .86rem; font-weight: 760;
  }
  .article-mobile-actions a:hover { text-decoration: none; color: var(--brand); background: var(--brand-soft); }
}
@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}