/*
 * [INPUT]: 依赖 index.html 的页面区块与 mockups.css 的产品界面。
 * [OUTPUT]: 提供姊妹官网的近黑布局、纯黑主题强调、.cn 备案页脚及下载码弹窗。
 * [POS]: 官网主视觉层；界面示意与响应式覆盖分别由 mockups.css、responsive.css 负责。
 * [PROTOCOL]: 变更时更新此头部，然后检查 CLAUDE.md
 */
:root {
  --bg:#0a0a0b;
  --bg-2:#101012;
  --surface:#171719;
  --surface-2:#202023;
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(255,255,255,.18);
  --ink:#f4f4f5;
  --muted:#a5a5ab;
  --faint:#86868e;
  --accent:#e8e8e9;
  --green:#57ca85;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,monospace;
  --maxw:1180px;
  --pad:clamp(1.25rem,5vw,4rem);
  --radius:14px;
  --ease:cubic-bezier(.16,1,.3,1);
  --sect-gap:clamp(5rem,11vw,9rem)
}
* {
  box-sizing:border-box;
  margin:0;
  padding:0
}
html {
  scroll-behavior:smooth;
  scroll-padding-top:85px;
  -webkit-text-size-adjust:100%
}
body {
  overflow-x:hidden;
  background:var(--bg);
  color:var(--ink);
  font:17px/1.65 var(--font);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility
}
h1,h2,h3 {
  line-height:1.12;
  letter-spacing:-.025em;
  text-wrap:balance;
  font-weight:700
}
p {
  text-wrap:pretty
}
a {
  color:inherit;
  text-decoration:none
}
button,input {
  font:inherit
}
button {
  cursor:pointer
}
strong,b {
  color:var(--ink)
}
em {
  font-style:normal
}
::selection {
  background:#eee;
  color:#111
}
:focus-visible {
  outline:2px solid #fff;
  outline-offset:3px;
  border-radius:4px
}
.skip-link {
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:.6rem 1rem;
  background:#fff;
  color:#111
}
.skip-link:focus {
  left:0
}
.accent {
  color:#f7f7f7;
  text-shadow:0 0 30px #ffffff35
}
.brand-dot {
  color:#b8b8bd
}
section {
  padding-inline:var(--pad)
}

/* ── 与姊妹站一致的导航与按钮 ── */
.nav {
  position:sticky;
  top:0;
  z-index:100;
  display:flex;
  align-items:center;
  gap:1.5rem;
  min-height:68px;
  padding:.75rem var(--pad);
  background:rgba(10,10,11,.8);
  backdrop-filter:saturate(150%) blur(16px);
  border-bottom:1px solid transparent;
  transition:border-color .3s
}
.nav.scrolled {
  border-color:var(--border)
}
.brand {
  display:flex;
  align-items:center;
  gap:.6rem;
  white-space:nowrap;
  font-size:1.25rem;
  font-weight:750;
  letter-spacing:-.04em
}
.brand-logo {
  display:block;
  width:34px;
  height:34px;
  flex:none;
  border-radius:9px;
  object-fit:cover;
  box-shadow:0 4px 16px #0008
}
.nav-links {
  display:flex;
  gap:1.65rem;
  margin-left:auto;
  color:var(--muted);
  font-size:.95rem
}
.nav-links a,.foot-links a {
  transition:color .2s
}
.nav-links a:hover,.foot-links a:hover {
  color:#fff
}
.language {
  padding:.45rem .75rem;
  border:1px solid var(--border);
  border-radius:99px;
  color:var(--muted);
  font-size:.9rem;
  white-space:nowrap
}
.btn {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  border:1px solid transparent;
  border-radius:99px;
  padding:.7rem 1.2rem;
  white-space:nowrap;
  font-size:.95rem;
  font-weight:680;
  line-height:1;
  transition:transform .2s,box-shadow .2s,background .2s,border-color .2s
}
.btn:hover {
  transform:translateY(-2px)
}
.btn-lg {
  padding:.95rem 1.6rem;
  font-size:1.03rem
}
.btn-primary {
  background:linear-gradient(145deg,#363638,#080809 65%);
  border-color:#69696c;
  color:#fff;
  box-shadow:0 8px 26px #000b,0 0 22px #ffffff13
}
.btn-primary:hover {
  border-color:#c8c8cc;
  box-shadow:0 10px 32px #000b,0 0 28px #ffffff28
}
.btn-ghost {
  color:var(--ink);
  border-color:var(--border-strong)
}
.btn-ghost:hover {
  background:var(--surface);
  border-color:#77777d
}
.btn-mark {
  display:inline-grid;
  place-items:center;
  width:18px;
  height:18px;
  border-radius:5px;
  background:#f4f4f5;
  color:#111;
  font:700 .72rem var(--mono)
}
.nav-cta {
  margin-left:.25rem
}
.live-dot {
  width:8px;
  height:8px;
  display:inline-block;
  flex:none;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 8px var(--green);
  animation:live 2s ease-in-out infinite
}
@keyframes live {
  50% {
    opacity:.4
  }
}

/* ── 首屏 ── */
.hero {
  position:relative;
  padding-top:clamp(3rem,7vw,6rem);
  padding-bottom:var(--sect-gap);
  overflow:hidden
}
.hero-glow {
  position:absolute;
  top:-22%;
  left:50%;
  width:min(1100px,120vw);
  height:780px;
  transform:translateX(-50%);
  pointer-events:none;
  background:radial-gradient(48% 52% at 54% 38%,rgba(155,155,165,.14),transparent 72%);
  filter:blur(15px)
}
.hero-inner {
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);
  align-items:center;
  gap:clamp(2rem,5vw,4.5rem);
  max-width:var(--maxw);
  margin:auto
}
.hero-eyebrow {
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin-bottom:1.4rem;
  color:var(--muted);
  font:.9rem var(--mono);
  letter-spacing:.02em
}
.hero-title {
  font-size:clamp(2.6rem,5.4vw,4.35rem)
}
.hero-sub {
  max-width:42ch;
  margin-top:1.5rem;
  color:var(--muted);
  font-size:clamp(1.05rem,1.6vw,1.2rem);
  line-height:1.7
}
.hero-actions {
  display:flex;
  flex-wrap:wrap;
  gap:.9rem;
  margin-top:2.2rem
}
.hero-meta {
  margin-top:1.6rem;
  color:var(--faint);
  font:.85rem var(--mono)
}
.stage-caption {
  margin-top:1.1rem;
  color:var(--faint);
  text-align:center;
  font-size:.9rem
}
.stage-caption span {
  margin-left:.45rem;
  font-size:.76rem;
  opacity:.7
}

/* ── 承诺与能力 ── */
.trust-strip {
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:clamp(1rem,3vw,2.5rem);
  max-width:var(--maxw);
  margin:0 auto var(--sect-gap);
  padding:1.4rem clamp(1rem,4vw,2.5rem);
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:linear-gradient(180deg,var(--surface),var(--bg-2));
  color:var(--muted);
  font-size:.98rem
}
.trust-strip span {
  display:inline-flex;
  align-items:center;
  gap:.55rem
}
.trust-strip i {
  color:#eee;
  font-size:1.1rem;
  font-style:normal
}
.section-head {
  max-width:760px;
  margin:0 auto clamp(2.5rem,5vw,4rem);
  text-align:center
}
.section-head h2 {
  font-size:clamp(2rem,4.6vw,3.25rem)
}
.section-head p {
  max-width:62ch;
  margin:1rem auto 0;
  color:var(--muted);
  font-size:1.1rem
}
.pillars {
  max-width:var(--maxw);
  margin:auto;
  padding-bottom:var(--sect-gap)
}
.pillar-grid {
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1.1rem
}
.pillar {
  min-width:0;
  padding:1.8rem 1.6rem;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  transition:transform .35s var(--ease),border-color .3s,background .3s
}
.pillar:hover {
  transform:translateY(-4px);
  border-color:var(--border-strong);
  background:var(--surface-2)
}
.pillar-tag {
  color:#ddd;
  font:.78rem var(--mono);
  letter-spacing:.04em
}
.pillar h3 {
  margin:.8rem 0 .6rem;
  font-size:1.23rem
}
.pillar p {
  color:var(--muted);
  font-size:.95rem
}

/* ── 功能展开 ── */
.feature {
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  align-items:center;
  gap:clamp(2rem,6vw,5rem);
  max-width:var(--maxw);
  margin:auto;
  padding-bottom:var(--sect-gap)
}
.feature-kicker {
  margin-bottom:1rem;
  color:#ddd;
  font:.82rem var(--mono);
  letter-spacing:.05em
}
.feature-copy h2 {
  font-size:clamp(1.8rem,3.6vw,2.8rem)
}
.feature-copy>p:not(.feature-kicker) {
  max-width:46ch;
  margin-top:1.2rem;
  color:var(--muted);
  font-size:1.08rem
}
.feature-copy > p.feature-note {
  margin-top:1.5rem;
  padding-top:1rem;
  border-top:1px solid var(--border);
  color:var(--faint);
  font-size:.9rem
}
.feature-list {
  display:grid;
  gap:1rem;
  margin-top:1.6rem;
  list-style:none
}
.feature-list li {
  position:relative;
  padding-left:1.6rem;
  color:var(--muted)
}
.feature-list li::before {
  content:"";
  position:absolute;
  top:.62em;
  left:0;
  width:7px;
  height:7px;
  border-radius:50%;
  background:#e6e6e8
}
.feature-visual {
  min-width:0
}

/* ── 界面巡览与使用流程 ── */
.tour,.usecase {
  max-width:var(--maxw);
  margin:auto;
  padding-bottom:var(--sect-gap)
}
.tour-grid {
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1.4rem
}
.tour-card {
  overflow:hidden;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  transition:transform .35s var(--ease),border-color .3s
}
.tour-card:hover {
  transform:translateY(-4px);
  border-color:var(--border-strong)
}
.tour-cap {
  padding:1.3rem 1.5rem 1.6rem
}
.tour-cap h3 {
  font-size:1.2rem
}
.tour-cap p {
  margin-top:.5rem;
  color:var(--muted);
  font-size:.95rem
}
.flow {
  display:flex;
  align-items:stretch;
  justify-content:center;
  gap:.8rem
}
.flow-step {
  flex:1 1 200px;
  max-width:280px;
  padding:1.6rem 1.3rem;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  text-align:center
}
.flow-n {
  display:inline-grid;
  place-items:center;
  width:44px;
  height:44px;
  margin-bottom:.9rem;
  border:1px solid #777;
  border-radius:12px;
  background:linear-gradient(150deg,#38383b,#101012);
  color:#fff;
  font-weight:750;
  font-size:1.2rem
}
.flow-step h3 {
  font-size:1.05rem
}
.flow-step p {
  margin-top:.4rem;
  color:var(--muted);
  font-size:.95rem
}
.flow-link {
  align-self:center;
  color:#ddd;
  font-size:1.4rem
}

/* ── 获取入口与页脚 ── */
.download {
  position:relative;
  overflow:hidden;
  padding-top:var(--sect-gap);
  padding-bottom:var(--sect-gap)
}
.dl-glow {
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(50% 60% at 50% 50%,rgba(180,180,185,.13),transparent 70%)
}
.dl-inner {
  position:relative;
  max-width:720px;
  margin:auto;
  text-align:center
}
.download-logo {
  display:block;
  width:76px;
  height:76px;
  margin:0 auto 1.6rem;
  border-radius:18px;
  box-shadow:0 16px 35px #0009;
  object-fit:cover
}
.dl-inner h2 {
  font-size:clamp(2rem,4.6vw,3.2rem)
}
.dl-inner>p {
  margin-top:1.1rem;
  color:var(--muted);
  font-size:1.1rem
}
.release-card {
  display:grid;
  gap:.35rem;
  width:min(100%,340px);
  margin:2.2rem auto 0;
  padding:1.2rem 1.4rem;
  border:1px solid var(--border-strong);
  border-radius:12px;
  background:var(--surface);
  text-align:left
}
.release-card strong {
  font-size:1.08rem
}
.release-card span {
  color:var(--muted);
  font-size:.86rem
}
.release-card small {
  color:var(--faint);
  font-size:.79rem
}
.release-download {
  width:max-content;
  margin-top:.55rem;
  padding:0;
  border:0;
  background:transparent;
  color:#fff;
  font-size:.94rem;
  font-weight:700;
  text-decoration:underline;
  text-decoration-color:#ddd;
  text-underline-offset:4px
}
.release-download:hover {
  color:#c8c8cc
}
.dl-inner .dl-note {
  margin-top:1.1rem;
  color:var(--faint);
  font:.82rem/1.6 var(--mono)
}
.footer {
  display:grid;
  gap:1.6rem;
  max-width:var(--maxw);
  margin:auto;
  padding:clamp(2.5rem,5vw,3.5rem) var(--pad) 3rem;
  border-top:1px solid var(--border)
}
.foot-brand {
  display:flex;
  align-items:center;
  gap:.8rem
}
.foot-name {
  font-weight:750;
  font-size:1.12rem
}
.foot-tag,.foot-links {
  color:var(--muted);
  font-size:.92rem
}
.foot-links {
  display:flex;
  flex-wrap:wrap;
  gap:1.4rem
}
.foot-copy {
  color:var(--faint);
  font-size:.85rem
}
.foot-filings {
  display:flex;
  flex-wrap:wrap;
  gap:.5rem 1.25rem;
  color:var(--faint);
  font-size:.78rem
}
.foot-filings a {
  display:inline-flex;
  align-items:center;
  gap:.3rem;
  color:inherit;
  text-decoration:none
}
.foot-filings a:hover {
  color:var(--ink)
}
.foot-filings img {
  width:1.2em;
  height:1.2em
}

/* ── 下载码弹窗 ── */
.code-dialog {
  width:min(calc(100% - 2rem),440px);
  margin:auto;
  padding:2rem;
  border:1px solid #55555b;
  border-radius:18px;
  background:#1a1a1d;
  color:var(--ink);
  box-shadow:0 30px 90px #000d
}
.code-dialog::backdrop {
  background:#000b;
  backdrop-filter:blur(7px)
}
.code-dialog form {
  display:grid
}
.dialog-close {
  position:absolute;
  right:1rem;
  top:.65rem;
  border:0;
  background:transparent;
  color:#aaa;
  font-size:1.7rem
}
.dialog-kicker {
  color:#bcbcc1;
  font:.78rem var(--mono)
}
.code-dialog h2 {
  margin:.45rem 0 1rem;
  font-size:2rem
}
.code-dialog p {
  color:var(--muted)
}
.code-dialog label {
  margin:1.4rem 0 .45rem;
  font-size:.9rem;
  font-weight:650
}
.code-dialog input {
  width:100%;
  padding:.75rem 1rem;
  border:1px solid #626269;
  border-radius:10px;
  outline:none;
  background:#101012;
  color:#fff
}
.code-dialog input:focus {
  border-color:#e8e8eb;
  box-shadow:0 0 0 3px #ffffff1c
}
.form-error {
  min-height:1.5em;
  margin:.45rem 0!important;
  color:#ff9e9e!important;
  font-size:.84rem
}
.dialog-submit {
  width:100%;
  padding:.95rem
}