/* Tidy product site.
   Tokens mirror desktop/ui/src/styles/tokens.css so the site and the app share one
   brand surface. When a token changes there, change it here in the same commit. */

:root {
  --brand-paper: #ffffff;
  --brand-mist: #eaf8f7;
  --brand-teal: #0cc2c7;
  --brand-teal-bright: #53d6d7;
  --brand-graphite: #1e262f;
  --brand-graphite-raised: #27323d;

  --bg: #152127;
  --fg: #f2f7f7;
  --fg-dim: #aab8bc;
  --fg-faint: #748389;
  --ok: #55c790;
  --warn: #d6a73b;
  --danger: #e06056;

  --panel: rgba(255, 255, 255, 0.045);
  --panel-solid: var(--brand-graphite-raised);
  --border: rgba(255, 255, 255, 0.09);
  --hover: rgba(255, 255, 255, 0.07);
  --accent: var(--brand-teal-bright);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --motion-fast: 140ms;
  --motion-base: 220ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);

  --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;

  --measure: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  overflow-wrap: break-word;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--brand-teal-bright);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

code, kbd, pre, .mono { font-family: var(--font-mono); }

.wrap { width: min(100% - 40px, var(--measure)); margin-inline: auto; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: var(--space-4);
  top: var(--space-4);
  z-index: 20;
  background: var(--brand-paper);
  color: var(--brand-graphite);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(150%) blur(12px);
  background: rgba(21, 33, 39, 0.82);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: 60px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }
.brand img { width: 26px; height: 26px; border-radius: 7px; display: block; }

.site-nav {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 14px;
}
.site-nav a { color: var(--fg-dim); }
.site-nav a:hover { color: var(--fg); text-decoration: none; }
.site-nav [aria-current="page"] { color: var(--fg); }

.lang-switch { display: inline-flex; gap: var(--space-1); font-size: 13px; color: var(--fg-faint); }
.lang-switch a { color: var(--fg-faint); }
.lang-switch [aria-current="true"] { color: var(--fg); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 500;
  transition: background var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--brand-paper); color: var(--brand-graphite); }
.btn-primary:hover { background: #e6f6f6; }
.btn-secondary { border-color: var(--border); color: var(--fg); background: var(--panel); }
.btn-secondary:hover { background: var(--hover); }
.btn-lg { padding: 13px 22px; font-size: 15px; }

/* ---------- generic section rhythm ---------- */

section { padding-block: clamp(56px, 8vw, 96px); }
section + section { border-top: 1px solid var(--border); }

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 var(--space-3);
}
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; margin: 0 0 var(--space-4); overflow-wrap: break-word; }
h1 { font-size: clamp(34px, 5.2vw, 52px); font-weight: 700; }
h2 { font-size: clamp(24px, 3.2vw, 32px); font-weight: 650; }
h3 { font-size: 17px; font-weight: 600; margin-bottom: var(--space-2); }
p { margin: 0 0 var(--space-4); color: var(--fg-dim); }
.lead { font-size: 18px; color: var(--fg-dim); max-width: 62ch; }
.section-intro { max-width: 64ch; }

/* ---------- hero ---------- */

.hero { padding-block: clamp(64px, 9vw, 120px) clamp(40px, 6vw, 72px); }
.hero h1 { max-width: 16em; }
.hero .lead { font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-block: var(--space-5) var(--space-4); }
.requirements {
  font-size: 13px;
  color: var(--fg-faint);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
}
.requirements span::after { content: " ·"; color: var(--border); }
.requirements span:last-child::after { content: ""; }

.notice {
  display: block;
  padding: var(--space-3) var(--space-4);
  border: 1px solid rgba(214, 167, 59, 0.35);
  background: rgba(214, 167, 59, 0.08);
  border-radius: var(--radius);
  margin-top: var(--space-5);
  font-size: 14px;
  color: var(--fg-dim);
  max-width: 68ch;
}
.notice strong { color: var(--fg); font-weight: 600; }

/* ---------- proof strip ---------- */

.proof { display: grid; gap: var(--space-4); grid-template-columns: repeat(3, 1fr); }
.proof > div {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: var(--radius);
  padding: var(--space-5);
}
.proof h3 { color: var(--fg); }
.proof p { margin: 0; font-size: 14px; }
.proof .src { display: block; margin-top: var(--space-3); font-size: 12px; color: var(--fg-faint); }

/* ---------- product screenshots ---------- */

/* Screenshots ship with their own window chrome and shadow in the alpha channel, so the
   figure adds no border or radius of its own. width/height on the <img> reserve the 3:2 box
   before the file lands. */
.shot { margin: 0; }
.shot picture { display: block; }
.shot img {
  display: block;
  width: 100%;
  height: auto;
  /* The app shell and the page share #152127, so without separation the window melts into
     the page. drop-shadow follows the PNG's alpha, keeping the rounded window corners. */
  filter: drop-shadow(0 22px 48px rgba(0, 0, 0, 0.55));
}
.shot figcaption { margin-top: var(--space-3); font-size: 13px; color: var(--fg-faint); max-width: 72ch; }
.shot-hero { margin-top: clamp(32px, 5vw, 56px); }
.flow-shot { grid-column: 1 / -1; margin-top: var(--space-2); }

/* ---------- workflows ---------- */

.flows { display: grid; gap: var(--space-4); }
.flow {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: var(--space-5);
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  align-items: start;
}
.flow h3 { margin-bottom: var(--space-2); }
.flow p { margin: 0; font-size: 14px; }
.flow ol { margin: 0; padding: 0; list-style: none; display: grid; gap: var(--space-2); }
.flow ol li {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: var(--space-3);
  font-size: 14px;
  color: var(--fg-dim);
  padding: 9px var(--space-3);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
}
.flow ol li b {
  color: var(--fg-faint);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  padding-top: 3px;
}
.flow ol li:last-child { background: rgba(83, 214, 215, 0.08); color: var(--fg); }

/* ---------- capability map ---------- */

.caps { display: grid; gap: var(--space-4); grid-template-columns: repeat(3, 1fr); }
.cap { border: 1px solid var(--border); border-radius: var(--radius); padding: var(--space-5); background: var(--panel); }
.cap p { font-size: 14px; margin-bottom: var(--space-3); }
.cap ul { margin: 0; padding-left: 1.1em; font-size: 13px; color: var(--fg-faint); }
.cap ul li { margin-bottom: 3px; }
.cap .limit { display: block; margin-top: var(--space-3); font-size: 12px; color: var(--warn); }

/* ---------- funnel (trust motif) ---------- */

.funnel { display: grid; gap: var(--space-2); margin-block: var(--space-5); }
.funnel li {
  list-style: none;
  display: grid;
  grid-template-columns: 28px 120px 1fr;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel);
  font-size: 14px;
  color: var(--fg-dim);
}
.funnel li b { color: var(--fg); font-weight: 600; }
.funnel li i { font-style: normal; color: var(--accent); font-family: var(--font-mono); font-size: 12px; }
.funnel li:last-child { border-color: rgba(83, 214, 215, 0.4); }

.facts { display: grid; gap: var(--space-4); grid-template-columns: repeat(2, 1fr); margin-top: var(--space-5); }
.facts > div { border: 1px solid var(--border); border-radius: var(--radius); padding: var(--space-5); background: var(--panel); }
.facts p { font-size: 14px; margin: 0; }
.facts h3 { color: var(--fg); }

/* ---------- code ---------- */

pre {
  margin: 0;
  overflow-x: auto;
  background: #101a1f;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  font-size: 13px;
  line-height: 1.7;
  color: #d7e5e6;
}
pre code { background: none; padding: 0; }
:not(pre) > code {
  overflow-wrap: anywhere;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 0.9em;
}

/* ---------- FAQ ---------- */

.faq { display: grid; gap: var(--space-2); max-width: 80ch; }
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: var(--space-3) var(--space-4);
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 15px; list-style: none; padding-block: var(--space-1); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--fg-faint); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq p { margin: var(--space-2) 0 var(--space-1); font-size: 14px; }

/* ---------- feedback ---------- */

.feedback {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: var(--space-5);
  max-width: 80ch;
}
.feedback p { font-size: 14px; }

/* ---------- final CTA ---------- */

.final { text-align: center; }
.final h2 { max-width: 22ch; margin-inline: auto; }
.final .lead { margin-inline: auto; }
.final .hero-actions { justify-content: center; }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--border); padding-block: var(--space-6); font-size: 14px; }
.footer-grid { display: grid; gap: var(--space-5); grid-template-columns: 1.4fr repeat(3, 1fr); }
.site-footer h4 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-faint); margin: 0 0 var(--space-3); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.site-footer a { color: var(--fg-dim); }
.site-footer a:hover { color: var(--fg); }
.footer-note { margin-top: var(--space-5); padding-top: var(--space-4); border-top: 1px solid var(--border); color: var(--fg-faint); font-size: 13px; }

/* ---------- blog ---------- */

.blog-head { padding-block: clamp(48px, 7vw, 80px) var(--space-5); }
.cat-nav { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.cat-nav a {
  font-size: 13px; color: var(--fg-dim);
  border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px;
}
.cat-nav a:hover { background: var(--hover); text-decoration: none; }

.post-list { display: grid; gap: var(--space-3); margin: 0 0 var(--space-6); padding: 0; list-style: none; }
.post-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--panel); padding: var(--space-4) var(--space-5);
  transition: background var(--motion-fast) var(--ease-standard);
}
.post-card:hover { background: var(--hover); }
.post-card h3 { margin-bottom: var(--space-1); }
.post-card h3 a { color: var(--fg); }
.post-card p { font-size: 14px; margin: 0 0 var(--space-2); }
.post-meta { font-size: 12px; color: var(--fg-faint); display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); }
.post-meta .badge { color: var(--accent); }
.empty { color: var(--fg-faint); font-size: 14px; border: 1px dashed var(--border); border-radius: var(--radius); padding: var(--space-5); }

.article-layout > * { min-width: 0; }
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  grid-template-areas: "head head" "body toc";
  column-gap: var(--space-6);
  align-items: start;
  padding-block: clamp(40px, 6vw, 64px);
}
.article-head { grid-area: head; max-width: 68ch; }
.article { grid-area: body; }
.toc { grid-area: toc; }
.article { max-width: 68ch; }
.article h1 { font-size: clamp(26px, 4vw, 38px); margin-bottom: var(--space-3); overflow-wrap: anywhere; }
.article-meta { font-size: 13px; color: var(--fg-faint); display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); margin-bottom: var(--space-5); padding-bottom: var(--space-4); border-bottom: 1px solid var(--border); }
.prose { color: #dfeaeb; }
.prose h2 { font-size: 22px; margin-top: var(--space-6); }
.prose h3 { font-size: 17px; margin-top: var(--space-5); }
.prose p, .prose li { font-size: 16px; line-height: 1.8; color: #cfdcde; }
.prose a { text-decoration: underline; text-underline-offset: 2px; }
.prose pre { max-width: 100%; }
/* Article figures: the caption is the point of the image, so it stays attached to it. */
.prose figure { margin: 0 0 var(--space-5); }
.prose figure img { display: block; width: 100%; height: auto; }
.prose figcaption { margin-top: var(--space-2); font-size: 13px; color: var(--fg-faint); }
.prose img { max-width: 100%; height: auto; border-radius: var(--radius); border: 1px solid var(--border); }
.prose blockquote { margin: 0 0 var(--space-4); padding-left: var(--space-4); border-left: 2px solid var(--border); color: var(--fg-dim); }
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: var(--space-4); }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--panel); }
.callout { border-radius: var(--radius); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-4); border: 1px solid var(--border); background: var(--panel); }
.callout p:last-child { margin-bottom: 0; }
.callout-warning, .callout-caution { border-color: rgba(214, 167, 59, 0.4); background: rgba(214, 167, 59, 0.07); }
.callout-important { border-color: rgba(224, 96, 86, 0.4); background: rgba(224, 96, 86, 0.07); }

.toc { position: sticky; top: 84px; font-size: 13px; }
.toc h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-faint); margin-bottom: var(--space-3); }
.toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.toc .d3 { padding-inline-start: var(--space-3); }
.toc a { color: var(--fg-dim); }

.article-cta {
  margin-top: var(--space-6); padding: var(--space-5);
  border: 1px solid rgba(83, 214, 215, 0.35); border-radius: var(--radius);
  background: rgba(83, 214, 215, 0.06);
}
.article-cta h2 { font-size: 19px; margin-bottom: var(--space-2); }
.article-cta p { font-size: 14px; }

.related { margin-top: var(--space-6); }
.related h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--fg-faint); }

/* ---------- legal ---------- */

.legal { padding-block: clamp(48px, 7vw, 80px); max-width: 72ch; }
.legal h2 { font-size: 20px; margin-top: var(--space-6); }
.legal p, .legal li { font-size: 15px; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .proof, .caps, .facts { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; grid-template-areas: "head" "toc" "body"; row-gap: var(--space-5); }
  .toc { position: static; border: 1px solid var(--border); border-radius: var(--radius); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-2); }
  .site-nav a[data-optional] { display: none; }
}

/* Below this width the in-page section links stop fitting next to the CTA. Blog and the
   locale switch stay, because they are the only cross-page destinations. */
@media (max-width: 700px) {
  .site-header .wrap { gap: var(--space-3); }
  .site-nav { gap: var(--space-3); }
  .site-nav a[href*="#"] { display: none; }
  .brand span { font-size: 15px; }
  .btn { padding: 7px 12px; font-size: 13px; white-space: nowrap; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .funnel li { grid-template-columns: 24px 1fr; }
  .funnel li i { grid-column: 1; }
  .funnel li span { grid-column: 2 / -1; }
  .article-meta { gap: var(--space-1) var(--space-2); }
  .prose table { display: block; overflow-x: auto; }
  .hero-actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}

/* 隐私页的字段清单表：一列事件名、一列字段，行高与正文一致。 */
.legal-table { width: 100%; border-collapse: collapse; font-size: 14px; margin: var(--space-4) 0; }
.legal-table th, .legal-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.legal-table th { font-size: 13px; letter-spacing: 0.02em; color: var(--fg-dim); }
.legal-table td:first-child { white-space: nowrap; }

@media (max-width: 640px) {
  .legal-table { display: block; overflow-x: auto; }
}