/* TopWriter 官网样式
   设计系统采用 Tailscale（docs/website-plan.md §5）：
   Inter 系无衬线 + 负字距标题、ink/bone 中性骨架、品牌蓝只给交互与焦点、
   小圆角无阴影的平面组件、墨黑主按钮。文案与中文数字保留中文风格。
   零外部请求：不引外链字体，Inter 仅本地已装时生效，否则系统 sans。 */

:root {
  --paper: #faf9f8;
  --paper-2: #f7f5f4;
  --paper-3: #eeebea;
  --card: #ffffff;
  --ink: #1f1e1e;
  --ink-2: #57514d;
  --ink-3: #8d867f;
  --line: #e4ded8;
  --line-strong: #d5cec7;
  --accent: #5a82de;
  --accent-deep: #324994;
  --accent-tint: #e4edfd;
  --warn: #d97917;
  --warn-tint: #fbeee0;
  --ok: #09825d;
  --ok-tint: #e8f3ee;
  --code-bg: #232222;
  --code-ink: #e9e4df;
  --code-dim: #918a83;
  --radius: 6px;
  --radius-lg: 10px;
  --container: 1120px;
  --font-body: "Inter", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: clip; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(90, 130, 222, .18); }

a { color: inherit; }

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

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 249, 248, .88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: border-color .3s;
}
.site-header.scrolled { border-bottom-color: var(--line-strong); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-right: auto;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: linear-gradient(135deg, #6c94ec, #5a82de);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
  display: grid;
  place-items: center;
  user-select: none;
}
.brand-word {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.015em;
}
.brand-word small {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--ink-3);
  margin-left: 6px;
  letter-spacing: .06em;
}

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  text-decoration: none;
  font-size: 15px;
  color: var(--ink-2);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color .15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); border-bottom-color: var(--accent); }

.header-cta { display: flex; align-items: center; gap: 18px; }

.nav-toggle {
  display: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 14px;
  color: var(--ink-2);
  cursor: pointer;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background .15s, color .15s, transform .15s;
}
.btn:focus-visible, a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
}
.btn-primary:hover { background: #000; transform: translateY(-1px); }
.btn-inverse {
  background: var(--paper);
  color: var(--ink);
  padding: 8px 16px;
}
.btn-inverse:hover { background: #fff; transform: translateY(-1px); }

.link-arrow {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 5px;
  transition: text-decoration-color .15s, color .15s;
}
.link-arrow:hover { color: var(--accent-deep); text-decoration-color: var(--accent); }
.link-arrow .arr { margin-left: 6px; transition: transform .15s; display: inline-block; }
.link-arrow:hover .arr { transform: translateX(3px); }

/* ---------- 区块骨架 ---------- */

/* 层次：米色页底 + 白色内容区块浮在上面（tailscale 骨架） */
.section { padding: 96px 0; }
.section + .section { padding-top: 0; }
.section-tint { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--ink-3);
  margin: 0 0 14px;
}

h1, h2, h3 { font-weight: 700; }

.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -.03em;
  line-height: 1.1;
  margin: 0 0 14px;
}
.section-lead { color: var(--ink-2); font-size: 17px; max-width: 620px; margin: 0 0 48px; }

/* ---------- Hero ---------- */

.hero { padding: 104px 0 88px; text-align: center; }
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .18em;
  color: var(--ink-3);
  margin: 0 0 20px;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  letter-spacing: -.03em;
  line-height: 1.08;
  margin: 0 auto 22px;
  max-width: 780px;
}
/* 标题本身演示产品：正文是墨色，灰字是灰的 */
.hero .ghost-word {
  color: #b3aca6;
  border-bottom: 3px solid var(--line-strong);
  padding-bottom: 2px;
}
.hero-sub {
  color: var(--ink-2);
  font-size: 17.5px;
  max-width: 660px;
  margin: 0 auto 36px;
}
.hero-ctas { display: flex; justify-content: center; align-items: center; gap: 28px; flex-wrap: wrap; }

/* 编辑器示意 */
.editor-mock {
  max-width: 780px;
  margin: 64px auto 0;
  background: var(--code-bg);
  border-radius: 12px;
  text-align: left;
  box-shadow: 0 32px 70px -32px rgba(31, 30, 30, .5);
  overflow: hidden;
}
.editor-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid #383533;
}
.editor-bar .dot { width: 11px; height: 11px; border-radius: 50%; background: #464240; }
.editor-bar .file {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--code-dim);
}
.editor-body {
  padding: 22px 24px 26px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 2;
  color: var(--code-ink);
}
.editor-body .dim { color: var(--code-dim); }
.editor-body .ghost-line { color: #8f8880; font-style: normal; }
.caret {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  background: var(--code-ink);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.editor-chip {
  margin: 0 24px 22px;
  display: inline-flex;
  gap: 10px;
  align-items: center;
  font-size: 12.5px;
  color: var(--code-dim);
  border: 1px solid #3d3a38;
  border-radius: 999px;
  padding: 5px 14px;
}
.editor-chip b { color: var(--code-ink); font-weight: 500; }
.editor-chip .key {
  font-family: var(--font-mono);
  border: 1px solid #4a4744;
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 6px;
  color: var(--code-ink);
  font-size: 11.5px;
}

/* 进场动效：hero 三段错峰浮现 */
.reveal { opacity: 0; transform: translateY(14px); animation: rise .7s ease forwards; }
.reveal.d1 { animation-delay: .08s; }
.reveal.d2 { animation-delay: .18s; }
.reveal.d3 { animation-delay: .3s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ---------- 数字条：白卡承载（米底浮白） ---------- */

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.stat {
  text-align: center;
  padding: 34px 18px 30px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.stat .num {
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.stat .num code { font-family: var(--font-mono); font-size: .78em; }
.stat .label { color: var(--ink-2); font-size: 14.5px; margin-top: 8px; }

/* ---------- 步骤卡 ---------- */

.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps-grid > *, .features-grid > * { min-width: 0; }
.step-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 26px 24px;
}
.step-no {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font-size: 17px;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
}
.step-card h3 { font-size: 19px; letter-spacing: -.01em; margin: 0 0 8px; }
.step-card p { color: var(--ink-2); font-size: 14.5px; margin: 0 0 14px; }
.step-card .micro {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 12px;
  overflow-x: auto;
  white-space: nowrap;
}

/* ---------- 功能卡：米底上的白卡 ---------- */

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  transition: border-color .2s, transform .2s;
}
.feature-card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.feature-icon { color: var(--ink); margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; letter-spacing: -.01em; margin: 0 0 8px; }
.feature-card p { color: var(--ink-2); font-size: 14.5px; margin: 0; }
.feature-card code { font-size: 13px; }

/* ---------- 工作原理 ---------- */

.arch { display: flex; align-items: stretch; gap: 0; justify-content: center; flex-wrap: wrap; }
.arch-node {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  width: 300px;
}
.arch-node h3 { font-size: 17px; margin: 0 0 6px; }
.arch-node .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
  display: block;
  margin-bottom: 8px;
}
.arch-node p { color: var(--ink-2); font-size: 13.5px; margin: 0; line-height: 1.65; }
.arch-node.core { border-color: var(--ink); }
.arch-arrow {
  align-self: center;
  color: var(--ink-3);
  font-size: 22px;
  padding: 0 14px;
  user-select: none;
}

.privacy-box {
  margin-top: 44px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink);
  border-radius: var(--radius);
  padding: 24px 28px;
  max-width: 760px;
}
.privacy-box h3 { font-size: 17px; margin: 0 0 8px; }
.privacy-box p { color: var(--ink-2); font-size: 14.5px; margin: 0; }
.privacy-box code { font-size: 13px; }

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

.faq { max-width: 760px; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 40px 20px 4px;
  position: relative;
  font-size: 16.5px;
  font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  font-size: 22px;
  font-weight: 400;
  transition: transform .2s;
}
.faq details[open] summary::after { content: "−"; }
.faq .faq-a { color: var(--ink-2); font-size: 15px; padding: 0 40px 22px 4px; margin: 0; }
.faq .faq-a code { font-size: 13.5px; }

/* ---------- CTA 收尾 ---------- */

.cta-band { background: var(--ink); color: var(--paper); padding: 96px 0; text-align: center; }
.cta-band h2 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -.02em;
  margin: 0 0 14px;
  color: var(--paper);
}
.cta-band p { color: #b7b0aa; margin: 0 0 36px; font-size: 16px; }
.cta-band .hero-ctas .btn-primary { background: var(--paper); color: var(--ink); }
.cta-band .hero-ctas .btn-primary:hover { background: #fff; }
.cta-band .link-arrow { color: var(--paper); text-decoration-color: #4a4644; }
.cta-band .link-arrow:hover { color: #fff; text-decoration-color: var(--paper); }

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
  padding: 56px 0 40px;
  position: relative;
  z-index: 1;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-brand p { color: var(--ink-2); font-size: 14px; max-width: 300px; margin: 14px 0 0; }
.footer-col h4 {
  font-size: 13px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.footer-col a {
  display: block;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14.5px;
  padding: 5px 0;
}
.footer-col a:hover { color: var(--accent-deep); }
.footer-meta {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- 代码块 ---------- */

.codeblock {
  position: relative;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 8px;
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.9;
  overflow-x: auto;
  margin: 0;
}
.codeblock .prompt { color: #a8a19a; user-select: none; }
.codeblock .cm { color: var(--code-dim); }
.codeblock .hl { color: #cfc7bf; }
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid #454140;
  background: #2e2c2b;
  color: var(--code-dim);
  font-size: 12px;
  border-radius: 5px;
  padding: 4px 10px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s, color .15s;
  font-family: var(--font-body);
}
.codeblock:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--code-ink); }

code.inline, .prose code {
  font-family: var(--font-mono);
  font-size: .86em;
  background: var(--paper-3);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--ink);
  overflow-wrap: anywhere;
}

/* ---------- 下载页 ---------- */

.page-head { padding: 88px 0 56px; }
.page-head h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); letter-spacing: -.03em; line-height: 1.1; margin: 0 0 16px; }
.page-head .lead { color: var(--ink-2); font-size: 17px; max-width: 620px; margin: 0; }

.notice {
  background: var(--accent-tint);
  border: 1px solid rgba(90, 130, 222, .35);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 24px;
  color: var(--ink-2);
  font-size: 14.5px;
  max-width: 860px;
}
.notice b { color: var(--accent-deep); }

.req-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 34px 0 0; }
.req-chip {
  font-size: 13.5px;
  color: var(--ink-2);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 6px 16px;
  background: var(--card);
}
.req-chip b { color: var(--ink); font-weight: 600; }

.install-steps { max-width: 860px; display: flex; flex-direction: column; gap: 40px; }
.install-step h3 {
  font-size: 20px;
  letter-spacing: -.01em;
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.install-step .no {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-3);
  font-weight: 400;
}
.install-step > p { color: var(--ink-2); font-size: 15px; margin: 0 0 16px; }

/* ---------- 使用说明 ---------- */

.docs-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding: 72px 0 96px; }
.docs-toc { position: sticky; top: 104px; align-self: start; }
.docs-toc .toc-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.docs-toc a {
  display: block;
  text-decoration: none;
  color: var(--ink-2);
  font-size: 14.5px;
  padding: 7px 0 7px 14px;
  border-left: 2px solid var(--line);
  transition: color .15s, border-color .15s;
}
.docs-toc a:hover { color: var(--ink); }
.docs-toc a.active { color: var(--ink); border-left-color: var(--ink); font-weight: 600; }

.docs-body { max-width: 760px; }
.doc-section { padding-bottom: 72px; scroll-margin-top: 98px; }
.doc-section h2 {
  font-size: 1.7rem;
  letter-spacing: -.03em;
  margin: 0 0 10px;
  scroll-margin-top: 98px;
}
.doc-section .doc-lead { color: var(--ink-2); font-size: 15px; margin: 0 0 32px; }

.qstep { display: flex; gap: 20px; margin-bottom: 34px; }
.qstep-no {
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  font-weight: 700;
  font-size: 15px;
  display: grid;
  place-items: center;
  margin-top: 2px;
}
.qstep-body { min-width: 0; flex: 1; }
.qstep-body h3 { font-size: 17.5px; letter-spacing: -.01em; margin: 4px 0 8px; }
.qstep-body p { color: var(--ink-2); font-size: 14.5px; margin: 0 0 14px; }

.success-box {
  background: var(--ok-tint);
  border: 1px solid rgba(9, 130, 93, .3);
  border-left: 3px solid var(--ok);
  border-radius: var(--radius);
  padding: 18px 24px;
  font-size: 14.5px;
  color: var(--ink-2);
  max-width: 720px;
}
.success-box b { color: var(--ok); }

.note-box {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-3);
  border-radius: var(--radius);
  padding: 16px 22px;
  font-size: 14px;
  color: var(--ink-2);
  margin: 20px 0;
  max-width: 760px;
}
.warn-box {
  background: var(--warn-tint);
  border: 1px solid rgba(217, 121, 23, .35);
  border-left: 3px solid var(--warn);
  border-radius: var(--radius);
  padding: 16px 22px;
  font-size: 14px;
  color: var(--ink-2);
  margin: 20px 0;
  max-width: 760px;
}
.warn-box b, .note-box b { color: var(--ink); }

.prose table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 18px 0 8px; display: block; overflow-x: auto; }
.prose th {
  text-align: left;
  background: var(--paper-3);
  font-weight: 600;
  padding: 10px 14px;
  border: 1px solid var(--line);
  font-size: 13.5px;
}
.prose td { padding: 10px 14px; border: 1px solid var(--line); color: var(--ink-2); vertical-align: top; }
.prose td code { font-size: 12.5px; }
.prose h3 { font-size: 19px; letter-spacing: -.01em; margin: 44px 0 10px; }
.prose p { color: var(--ink-2); font-size: 15px; margin: 0 0 16px; }
.prose li { color: var(--ink-2); font-size: 15px; margin-bottom: 6px; }

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .stats, .steps-grid, .features-grid { grid-template-columns: repeat(2, 1fr); }
  .arch-arrow { display: none; }
  .arch { gap: 20px; }
  .docs-layout { grid-template-columns: minmax(0, 1fr); }
  .docs-toc { position: static; display: flex; gap: 4px 22px; flex-wrap: wrap; margin-bottom: 40px; }
  .docs-toc a { border-left: none; padding-left: 0; }
  .docs-toc .toc-title { width: 100%; }
}
@media (max-width: 760px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 24px;
    gap: 14px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-block; }
  .header-inner { gap: 16px; }
  .brand-word small { display: none; }
}
@media (max-width: 400px) {
  .brand-word { font-size: 17px; }
  .editor-chip { flex-wrap: wrap; font-size: 11.5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { animation: none; opacity: 1; transform: none; }
  .caret { animation: none; }
  .feature-card, .btn-primary, .btn-inverse { transition: none; }
}