/* 组件与版式。只用 tokens.css 里的令牌。 */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--body);
  line-height: 1.55;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--claude); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.nb { white-space: nowrap; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- 文字 ---------- */
.h1, .h2, .h3, .quote { font-family: var(--font-serif); font-weight: 400; margin: 0; color: var(--ink); }
.h1 { font-size: var(--h1); line-height: 1.02; letter-spacing: var(--h1-track); text-align: center; }
.h2 { font-size: var(--h2); line-height: 1.08; letter-spacing: var(--h2-track); }
.h3 { font-size: var(--h3); line-height: 1.2; letter-spacing: var(--h3-track); }
.quote { font-size: var(--quote); line-height: 1.18; letter-spacing: -0.04em; text-align: center; }
/* 中文没有真正的斜体，强调用次要墨色而不是伪斜体 */
.quote em { font-style: normal; color: var(--ink-600); }
.lead { font-size: 19px; line-height: 1.5; color: var(--ink-600); margin: 0; }
.small { font-size: var(--small); letter-spacing: var(--small-track); line-height: 1.4; color: var(--ink-600); margin: 0; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: 0.02em; color: var(--ink-600); margin: 0; }
.mono { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s2);
  border-radius: var(--r-full); white-space: nowrap; font-weight: 500; text-decoration: none;
  cursor: pointer; border: 0; font-family: inherit; transition: all 0.2s var(--ease);
}
/* 黑色胶囊：次级操作、下载列表里的按钮 */
.btn-black { background: var(--ink); color: #fff; height: 32px; padding: 0 14px; min-width: 120px; font-size: 14px; }
.btn-black:hover { background: var(--ink-700); }
.btn-black.lg { height: 40px; padding: 0 20px; font-size: 15px; min-width: 0; }
/* 描边胶囊 */
.btn-line { background: var(--surface); color: var(--ink); height: 32px; padding: 0 14px; font-size: 14px; box-shadow: inset 0 0 0 1px var(--ink-200); }
.btn-line:hover { box-shadow: inset 0 0 0 1px var(--ink-600); }
.btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

/* 玻璃按钮：首屏唯一的主操作 */
.btn-glass {
  position: relative; isolation: isolate; overflow: hidden;
  height: 52px; padding: 0 34px; font-size: 17px; color: var(--ink);
  box-shadow: var(--shadow-glass); transition: box-shadow 0.5s var(--ease), transform 0.5s var(--ease);
}
.btn-glass::before {   /* 渐变描边 */
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; pointer-events: none;
  background: linear-gradient(rgba(255, 255, 255, 0.64) 40%, rgba(255, 255, 255, 0) 75% 95%, rgba(255, 255, 255, 0.64));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
}
.btn-glass::after {    /* 玻璃底 */
  content: ""; position: absolute; inset: 0; z-index: -1; border-radius: inherit;
  background-image: var(--glass-gradient); background-size: 300% 300%; background-position: 50% 0;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: background-position 0.5s var(--ease);
}
.btn-glass:hover { box-shadow: var(--shadow-glass-hover); transform: translateY(-1px); }
.btn-glass:hover::after { background-position: 50% 100%; }
.btn-glass svg { width: 18px; height: 18px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(252, 249, 247, 0.72); backdrop-filter: saturate(160%) blur(16px); -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent; transition: border-color 0.3s;
}
.nav.scrolled { border-bottom-color: var(--ink-100); }
.nav-inner { display: flex; align-items: center; gap: var(--s6); height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--font-serif); font-size: 21px; letter-spacing: -0.02em; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: none; gap: var(--s6); margin: 0 auto; padding: 0; list-style: none; }
.nav-links a { text-decoration: none; font-size: 15px; color: var(--ink-600); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }
.nav-cta { margin-left: auto; }
@media (min-width: 860px) { .nav-links { display: flex; } .nav-cta { margin-left: 0; } }

/* ---------- 首屏：天空 ---------- */
.sky {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-mid) 38%, var(--paper) 78%);
  margin-top: -64px; padding-top: calc(64px + var(--s20));
}
.sky::before, .sky::after {   /* 用模糊的径向渐变画两团云，不用图片 */
  content: ""; position: absolute; pointer-events: none; border-radius: 50%; filter: blur(30px);
  background: radial-gradient(closest-side, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0));
}
.sky::before { width: 900px; height: 280px; left: -220px; top: 110px; }
.sky::after { width: 1000px; height: 300px; right: -300px; top: 40px; opacity: 0.85; }
.cloud { position: absolute; pointer-events: none; border-radius: 50%; filter: blur(26px);
  background: radial-gradient(closest-side, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0)); }

.hero { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: var(--s8); text-align: center; }
.hero .lead { max-width: 640px; }
.hero-meta { display: flex; align-items: center; gap: var(--s2); }
.hero-meta svg { width: 14px; height: 17px; margin-top: -2px; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s2); }
.chip { display: inline-flex; align-items: center; gap: 7px; height: 30px; padding: 0 12px; border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.62); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.8), 0 1px 2px rgba(0, 0, 0, 0.04);
  font-size: 13px; font-weight: 500; color: var(--ink); }
.dot { width: 8px; height: 8px; border-radius: 2.5px; flex: none; }
.dot.claude { background: var(--claude); } .dot.codex { background: var(--codex); } .dot.gemini { background: var(--gemini); }

/* 首屏产品图：一条菜单栏，面板从上面垂下来 */
.stage { position: relative; z-index: 2; margin: var(--s16) auto 0; max-width: 980px; }
.menubar {
  display: flex; align-items: center; gap: 18px; height: 30px; padding: 0 16px;
  border-radius: 12px 12px 0 0; background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  font-size: 13px; color: var(--ink); box-shadow: inset 0 -1px 0 rgba(3, 3, 2, 0.06);
}
.menubar .spacer { flex: 1; }
.menubar .item { opacity: 0.75; }
.menubar .ours { display: inline-flex; align-items: center; gap: 5px; padding: 2px 8px; border-radius: 6px; background: rgba(3, 3, 2, 0.1); font-weight: 600; opacity: 1; }
.menubar .ours svg { width: 14px; height: 14px; }
.desk {
  position: relative; height: 560px; border-radius: 0 0 var(--r-lg) var(--r-lg);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.35), rgba(255, 255, 255, 0.05));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  overflow: hidden;
}
.desk .window {
  position: absolute; left: 6%; top: 46px; width: 62%;
  border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-block); opacity: 0.92;
}
.desk .panel {
  position: absolute; right: 6%; top: -2px; width: 300px;
  border-radius: 14px; overflow: hidden; box-shadow: 0 30px 60px rgba(0, 0, 0, 0.16), 0 6px 18px rgba(0, 0, 0, 0.1);
  transform: translateY(0); animation: drop 0.8s var(--ease) both 0.2s;
}
@keyframes drop { from { opacity: 0; transform: translateY(-14px); } to { opacity: 1; transform: none; } }
@media (max-width: 760px) {
  .menubar .item.optional { display: none; }
  .desk { height: 520px; }
  .desk .window { display: none; }
  .desk .panel { left: 50%; right: auto; width: min(300px, 86%); transform: translateX(-50%); animation: none; }
}

/* ---------- 区块 ---------- */
.section { padding: var(--s20) 0; }
.section-head { display: flex; flex-direction: column; align-items: center; gap: var(--s4); text-align: center; max-width: 720px; margin: 0 auto var(--s12); }
.section-head .h2 { text-align: center; }

/* 三个价值点 */
.trio { display: grid; gap: var(--s4); grid-template-columns: 1fr; }
@media (min-width: 860px) { .trio { grid-template-columns: repeat(3, 1fr); } }
.trio-card { border-radius: var(--r-lg); padding: var(--s8); display: flex; flex-direction: column; gap: var(--s3); }
.trio-card .num { font-family: var(--font-serif); font-size: 44px; line-height: 1; letter-spacing: -0.04em; }
.trio-card h3 { margin: 0; font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.trio-card p { margin: 0; font-size: 15px; color: var(--ink-600); }
.tint-cream { background: var(--tint-cream); } .tint-sky { background: var(--tint-sky); }
.tint-lilac { background: var(--tint-lilac); } .tint-mint { background: var(--tint-mint); } .tint-peach { background: var(--tint-peach); }

/* 功能：文字 + 截图卡片，左右交替 */
.feature { display: grid; gap: var(--s10); align-items: center; grid-template-columns: 1fr; padding: var(--s16) 0; }
@media (min-width: 960px) {
  .feature { grid-template-columns: 5fr 7fr; gap: var(--s16); }
  .feature.flip { grid-template-columns: 7fr 5fr; }
  .feature.flip .feature-text { order: 2; }
}
.feature-text { display: flex; flex-direction: column; gap: var(--s5); }
.feature-text .eyebrow { display: inline-flex; align-items: center; gap: var(--s2); }
.points { list-style: none; margin: var(--s2) 0 0; padding: 0; display: flex; flex-direction: column; }
.points li { display: grid; grid-template-columns: 22px 1fr; gap: var(--s3); padding: var(--s3) 0; border-top: 1px dashed var(--ink-200); font-size: 15px; color: var(--ink-600); }
.points li:last-child { border-bottom: 1px dashed var(--ink-200); }
.points strong { color: var(--ink); font-weight: 600; }
.points svg { width: 18px; height: 18px; margin-top: 3px; color: var(--ink); }

.shot {
  position: relative; border-radius: var(--r-lg); overflow: hidden; background: var(--surface);
  border: 0.5px solid var(--card-border); box-shadow: var(--shadow-block);
}
.shot.on-tint { padding: var(--s6); border: 0; box-shadow: none; }
.shot.on-tint img { border-radius: var(--r-md); box-shadow: var(--shadow-block); }
.shot-pair { display: grid; gap: var(--s4); grid-template-columns: 1fr; align-items: start; }
@media (min-width: 640px) { .shot-pair { grid-template-columns: 1fr 1fr; } }
.caption { margin-top: var(--s3); font-size: 13px; color: var(--ink-600); text-align: center; }

/* 隐私：四格 */
.grid4 { display: grid; gap: var(--s4); grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid4 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .grid4 { grid-template-columns: repeat(4, 1fr); } }
.mini { background: var(--surface); border: 0.5px solid var(--card-border); border-radius: var(--r-lg); padding: var(--s6); box-shadow: var(--shadow-block); }
.mini svg { width: 22px; height: 22px; }
.mini h3 { margin: var(--s4) 0 var(--s2); font-size: 17px; font-weight: 600; letter-spacing: -0.02em; }
.mini p { margin: 0; font-size: 15px; color: var(--ink-600); }

/* 引言 */
.quote-band { padding: var(--s30) 0; }
.quote-band .quote { max-width: 820px; margin: 0 auto; }

/* 收尾下载区 */
.cta { border-radius: var(--r-lg); overflow: hidden; position: relative; text-align: center;
  background: linear-gradient(180deg, var(--sky-mid), var(--paper)); padding: var(--s20) var(--s6);
  box-shadow: inset 0 0 0 1px var(--ink-100); }
.cta > * { position: relative; }
.cta .h2 { text-align: center; }
.cta .actions { display: flex; flex-direction: column; align-items: center; gap: var(--s4); margin-top: var(--s8); }

/* ---------- 下载页 ---------- */
.dl-hero { padding-bottom: var(--s16); }
.dl-grid { display: flex; flex-direction: column; gap: var(--s6); align-items: center; }
@media (min-width: 1100px) { .dl-grid { flex-direction: row; justify-content: center; align-items: stretch; } }
.dl-card {
  width: 100%; max-width: 568px; display: flex; flex-direction: column; gap: var(--s8);
  background: var(--surface); border: 0.5px solid var(--card-border); border-radius: var(--r-lg);
  box-shadow: var(--shadow-block); padding: var(--s8) var(--s6) var(--s6);
}
@media (min-width: 640px) { .dl-card { padding: var(--s10) var(--s12) var(--s8); } }
.dl-card .h3 { text-align: center; }
@media (min-width: 640px) { .dl-card .h3 { text-align: left; } }
.rows { display: flex; flex-direction: column; }
.row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--s4); padding: var(--s4) 0; border-top: 1px dashed var(--ink-200); }
.row:first-child { border-top: 0; }
@media (min-width: 640px) { .row { flex-wrap: nowrap; justify-content: space-between; gap: 10px; } }
.row-name { display: flex; align-items: center; gap: var(--s5); font-weight: 500; font-size: 17px; }
.row-name svg { width: 28px; height: 28px; flex: none; }
.row-name small { display: block; font-size: 13px; font-weight: 400; color: var(--ink-600); }
.row-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s2); }
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: flex; flex-direction: column; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 30px 1fr; gap: var(--s3); padding: var(--s4) 0; border-top: 1px dashed var(--ink-200); font-size: 15px; color: var(--ink-600); }
.steps li:first-child { border-top: 0; }
.steps li::before { content: counter(step); font-family: var(--font-serif); font-size: 22px; line-height: 1.1; color: var(--ink); }
.steps strong { color: var(--ink); font-weight: 600; }
.kbd { display: inline-block; padding: 0 6px; border-radius: 5px; background: var(--ink-50); box-shadow: inset 0 0 0 1px var(--ink-100); font-size: 13px; color: var(--ink); }

.facts { display: grid; grid-template-columns: 1fr; gap: 0; margin: 0; }
@media (min-width: 640px) { .facts { grid-template-columns: 1fr 1fr; column-gap: var(--s8); } }
.facts div { display: flex; justify-content: space-between; gap: var(--s4); padding: var(--s3) 0; border-top: 1px dashed var(--ink-200); }
.facts dt { font-size: 14px; color: var(--ink-600); }
.facts dd { margin: 0; font-size: 14px; font-weight: 500; text-align: right; }
.hash { display: flex; align-items: center; gap: var(--s3); padding: var(--s3) var(--s4); border-radius: var(--r-sm); background: var(--ink-50); }
.hash code { flex: 1; overflow-wrap: anywhere; color: var(--ink); }
.notice { display: flex; gap: var(--s3); align-items: flex-start; padding: var(--s4); border-radius: var(--r-md); background: var(--tint-cream); font-size: 14px; color: var(--ink); }
.notice svg { width: 18px; height: 18px; flex: none; margin-top: 2px; }

/* ---------- 页脚 ---------- */
.footer { padding: var(--s16) 0 var(--s12); border-top: 1px solid var(--ink-100); margin-top: var(--s16); }
.footer-grid { display: grid; gap: var(--s8); grid-template-columns: 1fr 1fr; }
@media (min-width: 860px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer h4 { margin: 0 0 var(--s3); font-size: 14px; font-weight: 600; }
.footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--s2); }
.footer a { text-decoration: none; font-size: 14px; color: var(--ink-600); }
.footer a:hover { color: var(--ink); }
.footer .fine { margin-top: var(--s12); font-size: 13px; color: var(--ink-600); display: flex; flex-wrap: wrap; gap: var(--s2) var(--s6); justify-content: space-between; }

/* 进场动画：滚到视口里再浮现 */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }