/* 版式：一张“网页”样张放在首屏右侧，下面的对照区像编辑改稿——原文、译文、荧光笔标出改动并在旁边写批注。
   颜色只用下面的变量；深色模式只重定义变量。 */
@font-face {
  font-family: "Bricolage Grotesque";
  src: url("/assets/fonts/bricolage-grotesque-5.3.0.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
}
@font-face {
  font-family: "Newsreader";
  src: url("/assets/fonts/newsreader-5.3.0.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
}

:root {
  --paper: #f3f5f7;
  --surface: #ffffff;
  --ink: #142230;
  --muted: #4f5d6a;
  --line: #d6dde4;
  --accent: #0a6b5e;
  --accent-ink: #ffffff;
  --accent-soft: #e1f1ed;
  --mark: #ffe59a;
  --mark-ink: #142230;
  --focus: #1b66d6;

  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-read: "Newsreader", Georgia, "Times New Roman", serif;
  --f-cjk: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.75rem, 1.3rem + 1.6vw, 2.25rem);
  --step-4: clamp(2.25rem, 1.4rem + 3.6vw, 3.75rem);
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e141a;
    --surface: #151e27;
    --ink: #e6edf3;
    --muted: #a3b0bc;
    --line: #2a3743;
    --accent: #5ccdb7;
    --accent-ink: #06201b;
    --accent-soft: #143430;
    --mark: #5b4a12;
    --mark-ink: #fff4cf;
    --focus: #7cb4ff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e141a;
  --surface: #151e27;
  --ink: #e6edf3;
  --muted: #a3b0bc;
  --line: #2a3743;
  --accent: #5ccdb7;
  --accent-ink: #06201b;
  --accent-soft: #143430;
  --mark: #5b4a12;
  --mark-ink: #fff4cf;
  --focus: #7cb4ff;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--step-0)/1.6 var(--f-body);
  overflow-wrap: break-word;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.12; margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
p { margin: 0; }
[hidden] { display: none !important; }

.wrap {
  max-width: 1120px;
  margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
@media (min-width: 720px) {
  .wrap { padding-left: max(32px, env(safe-area-inset-left, 0px)); padding-right: max(32px, env(safe-area-inset-right, 0px)); }
}
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -48px; background: var(--surface); color: var(--ink); padding: 8px 12px; border-radius: 6px; z-index: 5; }
.skip:focus { top: 12px; }

kbd {
  display: inline-block;
  min-width: 1.7em;
  padding: 0.05em 0.4em;
  margin: 0 0.08em;
  font: 600 0.85em/1.5 var(--f-body);
  text-align: center;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  border-radius: 6px;
}

.pill {
  display: inline-block;
  padding: 0.1em 0.6em;
  font: 600 0.75rem/1.6 var(--f-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  vertical-align: 0.15em;
  white-space: nowrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  font: 600 var(--step-0)/1 var(--f-body);
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.08); }
.btn[disabled] { opacity: 0.6; cursor: progress; }

/* 顶栏 */
.top { border-bottom: 1px solid var(--line); background: var(--paper); }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 700 var(--step-1)/1 var(--f-display); }
.top nav { display: flex; gap: 20px; }
.top nav a { color: var(--muted); text-decoration: none; font-size: var(--step--1); font-weight: 500; }
.top nav a:hover { color: var(--ink); }
@media (max-width: 560px) { .top nav { display: none; } }

/* 首屏 */
.hero { padding-block: 56px 64px; }
.hero-in { display: grid; gap: 40px; align-items: center; }
@media (min-width: 920px) { .hero-in { grid-template-columns: 1.05fr 1fr; gap: 56px; } .hero { padding-block: 80px 88px; } }
.hero-copy { display: grid; gap: 20px; min-width: 0; }
.eyebrow { font: 600 var(--step--1)/1 var(--f-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font-size: var(--step-4); font-weight: 750; letter-spacing: -0.025em; max-width: 14ch; }
.lede { font-size: var(--step-1); color: var(--muted); max-width: 34ch; }
.lede [data-lang] { color: var(--ink); font-weight: 600; }
.cta { display: grid; gap: 12px; margin-top: 8px; justify-items: start; }
.cta-note { font-size: var(--step--1); color: var(--muted); }
.soon { max-width: 46ch; }

.wl { display: grid; gap: 12px; width: 100%; max-width: 480px; }
.wl-row { display: flex; gap: 8px; flex-wrap: wrap; }
.wl-row input {
  flex: 1 1 220px;
  min-width: 0;
  min-height: 48px;
  padding: 0 14px;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.wl-row input::placeholder { color: var(--muted); opacity: 1; }
.wl-row .btn { flex: 0 0 auto; }
.wl-consent { display: flex; gap: 10px; align-items: flex-start; font-size: var(--step--1); color: var(--muted); }
.wl-consent input { width: 18px; height: 18px; margin: 3px 0 0; flex: none; accent-color: var(--accent); }
.wl-msg { font-size: var(--step--1); min-height: 1.6em; }
.wl-msg[data-tone="ok"] { color: var(--accent); font-weight: 600; }
.wl-msg[data-tone="err"] { color: var(--ink); font-weight: 600; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* 网页样张 */
.page {
  margin: 0;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 0 var(--line), 0 18px 40px -24px rgb(20 34 48 / 0.35);
  overflow: hidden;
}
.page-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px 10px 16px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.page-host { font: 500 0.8125rem/1.3 var(--f-body); color: var(--muted); min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.seg { display: inline-flex; padding: 3px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; }
.seg button {
  min-height: 32px;
  padding: 0 12px;
  font: 600 0.8125rem/1 var(--f-body);
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}
.seg button[aria-pressed="true"] { color: var(--ink); background: var(--surface); box-shadow: 0 1px 2px rgb(20 34 48 / 0.18); }
.page-body { padding: 24px 22px 26px; min-height: 11.5rem; }
.page-text { font: 400 var(--step-1)/1.75 var(--f-read); }
.page-text:lang(zh) { font-family: var(--f-cjk); line-height: 1.9; }
.page-text { animation: swap 0.28s ease-out; }
@keyframes swap { from { opacity: 0.35; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .page-text { animation: none; } }
.page figcaption { padding: 12px 16px; border-top: 1px solid var(--line); font-size: var(--step--1); color: var(--muted); }

/* 三个要点 */
.points { border-block: 1px solid var(--line); background: var(--surface); }
.points-in { display: grid; gap: 28px; padding-block: 40px; }
@media (min-width: 760px) { .points-in { grid-template-columns: repeat(3, 1fr); gap: 40px; } }
.point { display: grid; gap: 6px; align-content: start; }
.point h2 { font-size: var(--step-2); }
.point p { color: var(--muted); max-width: 32ch; }

/* 区块通用 */
.demo, .how, .pricing, .faq { padding-block: 72px; }
.sec-head { display: grid; gap: 10px; margin-bottom: 32px; max-width: 62ch; }
.sec-head h2 { font-size: var(--step-3); }
.sec-head p { color: var(--muted); }

/* 对照区 */
.pair { display: grid; gap: 0; margin-bottom: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 820px) { .pair { grid-template-columns: 1fr 1fr; } .pane-out { border-left: 1px solid var(--line); } }
.pane { display: grid; gap: 14px; align-content: start; padding: 22px; min-width: 0; }
.pane-out { border-top: 1px solid var(--line); }
@media (min-width: 820px) { .pane-out { border-top: 0; } }
.pane-label { font: 600 0.75rem/1 var(--f-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.pane-text { font: 400 var(--step-1)/1.75 var(--f-read); }
.pane-text:lang(zh) { font-family: var(--f-cjk); line-height: 1.9; }
.pane-src { font-size: 0.8125rem; color: var(--muted); }
.pane-src a { color: inherit; }
.m { border-bottom: 2px dotted var(--muted); }
mark { background: var(--mark); color: var(--mark-ink); padding: 0.05em 0.15em; border-radius: 3px; }
.m[data-n]::after, mark[data-n]::after, .notes li::before {
  font: 700 0.625rem/1 var(--f-body);
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: 999px;
}
.m[data-n]::after, mark[data-n]::after {
  content: attr(data-n);
  display: inline-block;
  min-width: 1.35em;
  padding: 0.2em 0.3em;
  margin-left: 0.2em;
  text-align: center;
  vertical-align: 0.5em;
}
.notes { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; counter-reset: n; font-size: var(--step--1); color: var(--muted); }
.notes li { counter-increment: n; display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: baseline; }
.notes li::before { content: counter(n); display: inline-block; min-width: 1.6em; padding: 0.3em 0.35em; text-align: center; }
.notes b { color: var(--ink); font-family: var(--f-cjk); font-weight: 600; }
.proof { max-width: 70ch; color: var(--muted); font-size: var(--step--1); }

/* 三种用法 */
.how { background: var(--surface); border-block: 1px solid var(--line); }
.ways { display: grid; gap: 28px; }
@media (min-width: 760px) { .ways { grid-template-columns: repeat(3, 1fr); gap: 40px; } }
.way { display: grid; gap: 10px; align-content: start; }
.way h3 { font-size: var(--step-1); }
.way p { color: var(--muted); }
.way-ic { width: 40px; height: 40px; fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

/* 价格 */
.plans { display: grid; gap: 20px; }
@media (min-width: 760px) { .plans { grid-template-columns: 1fr 1fr; } }
.plan { display: grid; gap: 14px; align-content: start; padding: 26px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.plan-pass { border: 2px solid var(--accent); }
.plan h3 { font-size: var(--step-1); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.price { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.amt { font: 700 var(--step-3)/1 var(--f-display); font-variant-numeric: tabular-nums; }
.per { color: var(--muted); }
.plan ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.plan li { display: grid; grid-template-columns: 18px 1fr; gap: 10px; }
.plan li::before { content: ""; width: 10px; height: 6px; margin-top: 0.55em; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.fine { margin-top: 20px; font-size: var(--step--1); color: var(--muted); }

/* 常见问题 */
.faq-in { display: grid; gap: 28px; }
@media (min-width: 900px) { .faq-in { grid-template-columns: 1fr 2.2fr; gap: 56px; } }
.faq h2 { font-size: var(--step-3); }
.qs { display: grid; border-top: 1px solid var(--line); min-width: 0; }
.qs details { border-bottom: 1px solid var(--line); }
.qs summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  font: 600 var(--step-1)/1.35 var(--f-display);
  cursor: pointer;
  list-style: none;
}
.qs summary::-webkit-details-marker { display: none; }
.qs summary::after { content: "+"; font: 400 1.5rem/1 var(--f-body); color: var(--accent); }
.qs details[open] summary::after { content: "–"; }
.qs details > :not(summary) { margin-bottom: 18px; color: var(--muted); max-width: 64ch; }
.qs details p + p { margin-top: -6px; }
.langs { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.langs li { padding: 4px 10px; font-size: var(--step--1); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; }
.langs li.tested { border-color: var(--accent); }
.langs li span { font-weight: 600; color: var(--accent); margin-left: 4px; }

/* 页脚 */
.foot { border-top: 1px solid var(--line); background: var(--surface); }
.foot-in { display: grid; gap: 12px; padding-block: 32px; font-size: var(--step--1); color: var(--muted); }
@media (min-width: 760px) { .foot-in { grid-template-columns: 1fr auto auto; align-items: center; gap: 28px; } }
.foot nav { display: flex; gap: 20px; flex-wrap: wrap; }
.foot nav a { color: var(--ink); }
.sel { user-select: all; color: var(--ink); }

/* 法律页 */
.doc { padding-block: 56px 72px; }
.doc-in { max-width: 70ch; display: grid; gap: 16px; }
.doc h1 { font-size: var(--step-3); }
.doc h2 { font-size: var(--step-1); margin-top: 16px; }
.doc ul { margin: 0; padding-left: 1.25em; display: grid; gap: 6px; }
.doc .draft { padding: 14px 16px; background: var(--accent-soft); border-radius: 8px; color: var(--ink); }
.doc .meta { color: var(--muted); font-size: var(--step--1); }