/* CoEditor 官网样式：与产品同一套颜色变量，静态优先、无构建、无第三方 */

:root {
  --bg: #ffffff;
  --paper: #ffffff;
  --ink: #191919;
  --ink-dim: #595959;
  --ink-faint: #727272;
  --line: #e8e8e8;
  --brand: #191919;
  --brand-soft: #f4f4f4;
  --green: #39805a;
  --amber: #595959;
  --warm: rgba(228, 190, 74, .16);
  --radius: 10px;
  --maxw: 1140px;
}

* { box-sizing: border-box; }

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

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

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

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

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

/* ---------------- 顶栏 ---------------- */
.nav {
  position: sticky; top: 0; z-index: 20; height: 64px;
  display: flex; align-items: center;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 28px; width: 100%; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; letter-spacing: .01em; color: var(--ink); }
.brand img { width: 22px; height: 22px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; }
.nav-links a { color: var(--ink-dim); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  padding: 7px 15px; border-radius: 8px; font-size: 14px;
  background: var(--brand); color: #fff !important;
}
.nav-cta:hover { background: #383838; text-decoration: none; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 8px; border: 1px solid transparent;
  font-size: 15px; font-weight: 500; cursor: pointer; font-family: inherit;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #383838; text-decoration: none; }
.btn-ghost { background: var(--paper); border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: #cfd2c8; text-decoration: none; }

/* ---------------- 首屏 ---------------- */
.hero { padding: 76px 0 24px; text-align: center; }
.hero h1 { font-size: 46px; line-height: 1.25; margin: 0 0 18px; letter-spacing: -.01em; }
.hero p.lead { font-size: 18px; color: var(--ink-dim); max-width: 640px; margin: 0 auto 30px; }
.hero .actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .sub { margin-top: 16px; font-size: 13px; color: var(--ink-faint); }
.hero-shot { margin: 46px auto 0; max-width: 1000px; }
.hero-shot img {
  border-radius: 12px; border: 1px solid var(--line);
  box-shadow: 0 18px 50px rgba(35, 30, 20, .10);
}

/* ---------------- 区块 ---------------- */
section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }
h2 { font-size: 30px; margin: 0 0 12px; letter-spacing: -.01em; }
.sec-lead { color: var(--ink-dim); max-width: 680px; margin: 0 0 34px; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 22px 20px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--ink-dim); font-size: 14.5px; }

/* 标记演示（和产品里的三种标记一致） */
.mark-demo { font-size: 15px; line-height: 2.1; color: var(--ink); }
.m-comment { text-decoration: underline dashed var(--green) 1.5px; text-underline-offset: 4px; }
.m-done { text-decoration: underline dashed var(--ink-faint) 1.5px; text-underline-offset: 4px; }
.m-retain { background: var(--warm); border-radius: 2px; }
.m-strike { text-decoration: line-through; text-decoration-color: #c0392b; text-decoration-thickness: 1.5px; }

/* 格式表 */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--ink-dim); font-size: 13px; letter-spacing: .02em; }
td.yes { color: var(--green); white-space: nowrap; }
td.no { color: var(--ink-faint); white-space: nowrap; }

/* 步骤 */
/* grid/flex 子项默认 min-width:auto：不显式归零，一个长 URL 就能把整页顶出横向滚动条 */
.steps { counter-reset: step; display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.step { display: flex; gap: 16px; align-items: flex-start; min-width: 0; }
/* 关键：flex 子项默认 min-width:auto，会被 <pre> 里的长 URL 顶宽，进而把整页撑出横向滚动 */
.step > div { min-width: 0; flex: 1 1 auto; }
.step pre { max-width: 100%; }
.step::before {
  counter-increment: step; content: counter(step);
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  background: var(--brand-soft); color: var(--brand);
  display: grid; place-items: center; font-size: 13px; font-weight: 600;
}
.step code, code.inline {
  background: #f1f0ea; border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 6px; font-size: 13.5px;
}
pre {
  background: #f1f0ea; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.7; margin: 0 0 10px;
}

/* FAQ */
details.faq {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 18px; margin-bottom: 10px;
}
details.faq summary { cursor: pointer; font-weight: 500; }
details.faq summary::marker { color: var(--ink-faint); }
details.faq p { margin: 10px 0 0; color: var(--ink-dim); font-size: 14.5px; }

.note {
  background: var(--paper); border: 1px solid var(--line); border-left: 3px solid var(--amber);
  border-radius: 6px; padding: 12px 16px; font-size: 14px; color: var(--ink-dim);
}
.note b { color: var(--ink); }

/* ---------------- 页脚 ---------------- */
footer {
  border-top: 1px solid var(--line); padding: 34px 0 46px;
  font-size: 13.5px; color: var(--ink-faint);
}
footer .cols { display: flex; gap: 40px; flex-wrap: wrap; margin-bottom: 18px; }
footer h4 { font-size: 13px; color: var(--ink-dim); margin: 0 0 8px; font-weight: 600; }
footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
footer a { color: var(--ink-dim); }

/* ---------------- 演示页 ---------------- */
.demo-shell {
  display: grid; grid-template-columns: 1fr 320px; gap: 20px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; min-height: 420px;
}
.demo-doc { padding: 30px 34px; font-size: 15.5px; line-height: 1.95; }
.demo-doc h3 { margin: 0 0 4px; font-size: 19px; }
.demo-doc .meta { color: var(--ink-faint); font-size: 12.5px; margin-bottom: 22px; }
.demo-doc p { margin: 0 0 16px; }
.demo-rail { border-left: 1px solid var(--line); background: #fbfbf8; padding: 18px; overflow-y: auto; max-height: 560px; }
.demo-rail h4 { margin: 0 0 12px; font-size: 13px; color: var(--ink-dim); }
.demo-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: 8px;
  padding: 10px 12px; margin-bottom: 10px; font-size: 13px; line-height: 1.6;
}
.demo-card .q { color: var(--ink-faint); margin-top: 6px; font-size: 12px;
  overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.demo-card .row { display: flex; gap: 8px; margin-top: 8px; }
.demo-card button {
  border: 1px solid var(--line); background: var(--paper); border-radius: 6px;
  padding: 3px 9px; font-size: 12px; cursor: pointer; font-family: inherit; color: var(--ink-dim);
}
.demo-card button:hover { border-color: #cfd2c8; color: var(--ink); }
.demo-card.done .body { color: var(--ink-faint); }
.demo-empty { color: var(--ink-faint); font-size: 13px; }
.mark-dashed { text-decoration: underline dashed var(--green) 1.5px; text-underline-offset: 4px; cursor: pointer; }
.mark-dashed.is-done { text-decoration-color: var(--ink-faint); }
.mark-retain { background: var(--warm); border-radius: 2px; }
.mark-strike { text-decoration: line-through; text-decoration-color: #c0392b; text-decoration-thickness: 1.5px; }

.sel-menu {
  position: absolute; z-index: 30; display: flex; gap: 2px;
  background: #252923; border-radius: 8px; padding: 4px; box-shadow: 0 10px 26px rgba(20,18,14,.22);
}
.sel-menu button {
  border: 0; background: transparent; color: #f2f2ee; font: inherit; font-size: 13px;
  padding: 5px 11px; border-radius: 6px; cursor: pointer;
}
.sel-menu button:hover { background: rgba(255,255,255,.14); }

.composer {
  position: absolute; z-index: 31; width: 320px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 16px 40px rgba(25,22,16,.16); padding: 12px;
}
.composer textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 7px; padding: 9px 10px;
  font: inherit; font-size: 14px; resize: vertical; min-height: 68px;
}
.composer .row { display: flex; align-items: center; gap: 8px; margin-top: 9px; }
.composer .row .hint { font-size: 12px; color: var(--ink-faint); margin-right: auto; }

.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.toolbar .grow { margin-left: auto; }
.pill {
  font-size: 12.5px; color: var(--ink-dim); background: var(--paper);
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 11px;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .hero h1 { font-size: 34px; }
  .grid3 { grid-template-columns: 1fr; }
  .demo-shell { grid-template-columns: 1fr; }
  .demo-rail { border-left: 0; border-top: 1px solid var(--line); max-height: none; }
  section { padding: 54px 0; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .nav-links { display: none; }
  .hero { padding: 48px 0 16px; }
  .hero h1 { font-size: 27px; }
  .hero p.lead { font-size: 16px; }
  .hero .actions .btn { width: 100%; justify-content: center; }
  h2 { font-size: 23px; }
  .wrap { padding: 0 18px; }
  .demo-doc { padding: 22px 18px; }
}

/* 品牌灰阶，批注的语义色保留。 */
:focus-visible { outline: 2px solid var(--ink); outline-offset: 5px; }
.btn, .nav-cta { transition: background .16s ease, transform .16s ease; }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.brand img { filter: grayscale(1); }
.landing .hero { padding: 96px 24px 44px; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .04em; margin: 0 0 24px; }
.landing .hero h1 { font-size: clamp(42px, 6vw, 76px); line-height: 1.13; letter-spacing: -.045em; font-weight: 750; margin-bottom: 26px; }
.landing .hero .lead { max-width: 580px; font-size: 19px; line-height: 1.8; }
.landing .hero-shot { margin-top: 64px; max-width: 1080px; padding: 16px; background: #f5f5f5; border-radius: 16px; }
.landing .hero-shot img { border-radius: 8px; box-shadow: 0 8px 24px #00000009; }
.landing section { padding: 88px 0; scroll-margin-top: 64px; }
.landing h2 { font-size: clamp(28px, 3.4vw, 42px); line-height: 1.3; letter-spacing: -.025em; }
.landing .grid3 { gap: 36px; margin-top: 40px; }
.landing .grid3 .card { padding: 0; border: 0; border-radius: 0; }
.landing .card h3 { font-size: 19px; margin-bottom: 12px; }
.landing .card p { font-size: 16px; line-height: 1.8; }
.landing .mark-demo { background: #f7f7f7; padding: 32px; border: 0; }
.landing #persist { background: #fafafa; }
.landing #persist .card { background: transparent; }
.landing details.faq { border: 0; border-bottom: 1px solid var(--line); border-radius: 0; padding: 20px 0; }
.landing .note, pre, .step code, code.inline { background: #f5f5f5; }
@media (max-width:640px) {
  .nav-links { display:flex; gap:12px; }
  .nav-links > a:not(.nav-cta) { display:none; }
  .nav .wrap { gap:12px; }
  .landing .hero { padding:56px 20px 24px; }
  .landing .hero .lead { font-size:17px; }
  .landing .hero-shot { margin-top:36px; padding:6px; }
  .landing section { padding:54px 0; }
  .landing .grid3 { gap:28px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}