:root {
  --paper: #F4F5F1;
  --card: rgba(255, 255, 255, 0.62);
  --ink: #17181A;
  --ink2: #5F605C;
  --ink3: #8E8F8A;
  --pine: #2E5E4E;
  --pine-ink: #FFFFFF;
  --mist: #D5E6DC;
  --sand: #F3E4D2;
  --line: #E1E2DC;
  --rim: rgba(255, 255, 255, 0.7);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111312;
    --card: rgba(30, 33, 31, 0.66);
    --ink: #ECEDE9;
    --ink2: #A4A5A0;
    --ink3: #74756F;
    --pine: #7FB8A4;
    --pine-ink: #0E1A16;
    --mist: #1D3A30;
    --sand: #2A2620;
    --line: #262927;
    --rim: rgba(255, 255, 255, 0.07);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--pine); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--pine); outline-offset: 3px; border-radius: 6px; }

.wrap { max-width: 1080px; margin: 0 auto; padding-inline: 24px; }
.narrow { max-width: 720px; }

/* 顶栏 */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; backdrop-filter: saturate(1.6) blur(18px); -webkit-backdrop-filter: saturate(1.6) blur(18px); background: color-mix(in srgb, var(--paper) 72%, transparent); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.top nav { display: flex; gap: 22px; font-size: 15px; }
.top nav a { color: var(--ink2); text-decoration: none; }
.top nav a:hover { color: var(--ink); }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: 0.01em; margin: 0; }
h1 { font-size: clamp(40px, 6.4vw, 68px); line-height: 1.22; }
h2 { font-size: clamp(28px, 3.6vw, 38px); line-height: 1.35; }
h3 { font-size: 24px; line-height: 1.4; }
p { margin: 0; }
.lede { font-size: 18px; color: var(--ink2); max-width: 30em; }

.btn { display: inline-flex; align-items: center; gap: 8px; height: 48px; padding: 0 22px; border-radius: 999px; font-size: 16px; font-weight: 500; text-decoration: none; border: 0; cursor: pointer; transition: transform .2s ease; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--pine); color: var(--pine-ink); }
.btn.ghost { background: var(--card); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line); }
.btn svg { width: 18px; height: 18px; }

/* 首屏 */
.hero { position: relative; overflow: hidden; }
.hero::before, .hero::after { content: ""; position: absolute; border-radius: 50%; filter: blur(70px); z-index: -1; }
.hero::before { width: 620px; height: 620px; background: var(--mist); right: -120px; top: -140px; }
.hero::after { width: 480px; height: 480px; background: var(--sand); right: 260px; top: 300px; opacity: .8; }
.hero .wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; padding-block: 72px 96px; }
.hero .copy { display: grid; gap: 28px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero .fine { font-size: 14px; color: var(--ink3); }

/* 演示手机 */
.phone { justify-self: center; width: 320px; max-width: 100%; aspect-ratio: 9 / 19; border-radius: 48px; padding: 14px; background: var(--card); box-shadow: inset 0 0 0 1px var(--rim), 0 30px 80px -30px rgba(23, 40, 33, .35); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }
.screen { height: 100%; border-radius: 36px; background: linear-gradient(160deg, color-mix(in srgb, var(--mist) 55%, var(--paper)), var(--paper) 45%, color-mix(in srgb, var(--sand) 60%, var(--paper))); padding: 44px 16px 16px; display: flex; flex-direction: column; gap: 10px; font-size: 13.5px; line-height: 1.6; overflow: hidden; }
.screen .who { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.screen .who i { width: 26px; height: 26px; border-radius: 50%; background: var(--pine); color: var(--pine-ink); font-style: normal; display: grid; place-items: center; font-size: 12px; }
.msg-user { align-self: flex-end; background: var(--pine); color: var(--pine-ink); padding: 8px 12px; border-radius: 16px 16px 4px 16px; max-width: 85%; }
.chip { align-self: flex-start; font-size: 12px; color: var(--ink2); background: var(--card); padding: 3px 10px; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--line); }
.msg-ai { color: var(--ink); }
.approve { background: var(--card); border-radius: 18px; padding: 12px; box-shadow: inset 0 0 0 1px var(--rim), 0 8px 24px -12px rgba(0,0,0,.18); display: grid; gap: 8px; }
.approve small { color: var(--pine); font-size: 11px; }
.approve b { font-weight: 600; }
.approve .row { display: flex; gap: 8px; }
.approve .ok, .approve .no { height: 32px; padding: 0 16px; border-radius: 999px; display: grid; place-items: center; font-size: 13px; }
.approve .ok { background: var(--pine); color: var(--pine-ink); position: relative; }
.approve .no { background: color-mix(in srgb, var(--ink) 7%, transparent); }
.approve .done { display: none; color: var(--pine); font-weight: 500; }
.approve.is-done .row { display: none; }
.approve.is-done .done { display: block; }
.approve .ok::after { content: ""; position: absolute; inset: 0; border-radius: inherit; box-shadow: 0 0 0 0 var(--pine); opacity: 0; }
.approve.is-tap .ok { transform: scale(.94); transition: transform .15s; }
.approve.is-tap .ok::after { animation: ring .6s ease-out; }
@keyframes ring { from { opacity: .5; box-shadow: 0 0 0 0 var(--pine); } to { opacity: 0; box-shadow: 0 0 0 14px var(--pine); } }

.demo [data-step] { opacity: 0; transform: translateY(8px); transition: opacity .45s ease, transform .55s cubic-bezier(.2,.8,.2,1); }
.demo [data-step].in { opacity: 1; transform: none; }
.typing::after { content: "▍"; color: var(--pine); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.screen .input { margin-top: auto; height: 38px; border-radius: 999px; background: var(--card); box-shadow: inset 0 0 0 1px var(--line); color: var(--ink3); font-size: 12.5px; display: flex; align-items: center; padding: 0 14px; }

/* 内容区块 */
section { padding-block: 88px; }
.section-head { display: grid; gap: 14px; margin-bottom: 56px; max-width: 34em; }
.section-head p { color: var(--ink2); font-size: 17px; }

.pillar { display: grid; grid-template-columns: 260px 1fr; gap: 72px; align-items: center; padding-block: 36px; }
.pillar + .pillar { border-top: 1px solid var(--line); }
.pillar:nth-child(even) { grid-template-columns: 1fr 260px; }
.pillar:nth-child(even) .shot { order: 2; }
.shot { border-radius: 30px; overflow: hidden; box-shadow: 0 0 0 1px var(--line), 0 24px 60px -30px rgba(23, 40, 33, .4); }
.pillar .text { display: grid; gap: 16px; max-width: 30em; }
.pillar .text p { color: var(--ink2); }
.pillar ul { margin: 4px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.pillar li { padding-left: 20px; position: relative; }
.pillar li::before { content: ""; position: absolute; left: 2px; top: .75em; width: 7px; height: 7px; border-radius: 50%; background: var(--pine); }

/* 对比表 */
.compare { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 560px; }
th, td { text-align: left; padding: 16px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { font-weight: 500; color: var(--ink2); font-size: 15px; }
thead th:last-child { color: var(--pine); }
tbody th { font-weight: 500; width: 26%; }
td { color: var(--ink2); }
td:last-child { color: var(--ink); }

/* 隐私承诺 */
.promises { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.promise { background: var(--card); border-radius: 24px; padding: 28px; box-shadow: inset 0 0 0 1px var(--line); display: grid; gap: 8px; align-content: start; }
.promise h3 { font-size: 20px; }
.promise p { color: var(--ink2); font-size: 15px; }

/* 下载 */
.download { background: color-mix(in srgb, var(--mist) 45%, var(--paper)); }
.dl { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; }
.dl-card { background: var(--card); border-radius: 28px; padding: 32px; display: grid; gap: 18px; align-content: start; box-shadow: inset 0 0 0 1px var(--rim); }
.dl-card h3 { font-size: 22px; }
.meta { display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; font-size: 14px; color: var(--ink2); margin: 0; }
.meta dt { color: var(--ink3); }
.meta dd { margin: 0; overflow-wrap: anywhere; }
.hash { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.note { font-size: 14px; color: var(--ink2); }
.status { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; color: var(--ink2); }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #C9A227; box-shadow: 0 0 0 4px color-mix(in srgb, #C9A227 25%, transparent); }

footer { padding-block: 40px 56px; font-size: 14px; color: var(--ink3); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer nav { display: flex; gap: 20px; }
footer a { color: var(--ink2); text-decoration: none; }
footer a:hover { color: var(--ink); }

/* 文档页 */
.doc { padding-block: 56px 88px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); margin-bottom: 8px; }
.doc .updated { color: var(--ink3); font-size: 14px; margin-bottom: 40px; }
.doc h2 { font-size: 22px; margin: 44px 0 12px; }
.doc p, .doc li { color: var(--ink2); }
.doc p + p { margin-top: 12px; }
.doc ul { padding-left: 1.2em; margin: 12px 0; }
.doc li + li { margin-top: 6px; }
.doc strong { color: var(--ink); font-weight: 500; }
.faq { display: grid; gap: 12px; margin-top: 8px; }
.faq details { background: var(--card); border-radius: 18px; padding: 18px 22px; box-shadow: inset 0 0 0 1px var(--line); }
.faq summary { cursor: pointer; font-weight: 500; color: var(--ink); list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq details[open] summary { margin-bottom: 10px; }
.contact { margin-top: 40px; padding: 28px; border-radius: 24px; background: color-mix(in srgb, var(--mist) 45%, var(--paper)); }
.contact p { color: var(--ink); }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; padding-block: 40px 64px; }
  .pillar, .pillar:nth-child(even) { grid-template-columns: 1fr; gap: 28px; }
  .pillar:nth-child(even) .shot { order: 0; }
  .shot { max-width: 260px; }
  .dl, .promises { grid-template-columns: 1fr; }
  section { padding-block: 64px; }
}
@media (max-width: 520px) {
  .top nav a:not(:last-child) { display: none; }
  .phone { width: 290px; }
  .dl-card, .promise { padding: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  .demo [data-step] { opacity: 1; transform: none; transition: none; }
  .btn { transition: none; }
}