/* ==========================================================================
   再现AI 官网样式
   配色：宣纸底 + 墨黑 + 雅金 + 青黛
   ========================================================================== */

:root {
  --paper: #F8F5EF;
  --paper-2: #FFFFFF;
  --ink: #15181C;
  --ink-2: #2B3138;
  --ink-soft: #4A5158;
  --muted: #7A746B;
  --gold: #B98B3E;
  --gold-light: #DCC49A;
  --jade: #1F4E5F;
  --line: rgba(21, 24, 28, .12);
  --line-soft: rgba(21, 24, 28, .07);
  --shadow-sm: 0 6px 20px rgba(21, 24, 28, .06);
  --shadow: 0 18px 48px rgba(21, 24, 28, .10);
  --shadow-lg: 0 30px 80px rgba(21, 24, 28, .16);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1200px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --header-h: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--serif); color: var(--ink); margin: 0; line-height: 1.35; font-weight: 600; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ------------------------------------------------------------ 通用组件 */
.section { padding: 96px 0; position: relative; }
.section--tight { padding: 64px 0; }
.section--paper2 { background: var(--paper-2); }
.section--ink { background: var(--ink); color: rgba(255, 255, 255, .78); }
.section--ink h2, .section--ink h3, .section--ink h4 { color: #fff; }
.section--grain { background: linear-gradient(180deg, #1B2A31 0%, #14212A 100%); color: rgba(255, 255, 255, .78); }
.section--grain h2, .section--grain h3 { color: #fff; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold); font-weight: 600; margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--gold); }
.section--ink .eyebrow, .section--grain .eyebrow { color: #D9B779; }
.section--ink .eyebrow::before, .section--grain .eyebrow::before { background: #D9B779; }

.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 40px); margin-bottom: 16px; }
.section-head p { color: var(--muted); font-size: 17px; }
.section--ink .section-head p, .section--grain .section-head p { color: rgba(255, 255, 255, .62); }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  height: 52px; padding: 0 30px; border-radius: 999px;
  font-size: 16px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: .28s ease;
  font-family: var(--sans);
}
.btn svg { width: 18px; height: 18px; }
.btn-gold { background: linear-gradient(135deg, #C99A4C, #A9762C); color: #fff; box-shadow: 0 10px 26px rgba(169, 118, 44, .28); }
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(169, 118, 44, .36); }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { transform: translateY(-2px); background: #000; }
.btn-outline { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-outline:hover { border-color: var(--gold); color: var(--gold); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { transform: translateY(-2px); }
.btn-ghost { border-color: rgba(255, 255, 255, .35); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); border-color: #fff; }
.btn-sm { height: 40px; padding: 0 20px; font-size: 14px; }

.icon { width: 20px; height: 20px; flex: none; }

/* 滚动显现 */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.22, .68, .36, 1); }
[data-reveal].is-in { opacity: 1; transform: none; }

/* ------------------------------------------------------------ 头部 */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  transition: background .3s ease, box-shadow .3s ease, height .3s ease;
}
.site-header.is-scrolled {
  height: 66px;
  background: rgba(248, 245, 239, .92);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  box-shadow: 0 1px 0 var(--line-soft), 0 10px 30px rgba(21, 24, 28, .05);
}
.header-inner { height: 100%; display: flex; align-items: center; gap: 24px; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo-dark { display: none; }
.site-header:not(.is-scrolled) .brand-logo { display: none; }
.site-header:not(.is-scrolled) .brand-logo-dark { display: block; }
.brand-name { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name b { font-family: var(--serif); font-size: 20px; color: var(--ink); letter-spacing: .04em; }
.brand-name i { font-style: normal; font-size: 11px; letter-spacing: .16em; color: var(--muted); }
.site-header:not(.is-scrolled) .brand-name b { color: #fff; }
.site-header:not(.is-scrolled) .brand-name i { color: rgba(255, 255, 255, .6); }

.logo-text { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, #2C6274, #12262E); color: #E7C88F;
  font-family: var(--serif); font-size: 20px;
}
.logo-word { display: flex; flex-direction: column; line-height: 1.15; }
.logo-word b { font-family: var(--serif); font-size: 19px; color: var(--ink); }
.logo-word i { font-style: normal; font-size: 11px; color: var(--muted); letter-spacing: .1em; }
.site-header:not(.is-scrolled) .logo-word b { color: #fff; }
.site-header:not(.is-scrolled) .logo-word i { color: rgba(255, 255, 255, .6); }

/* 图片 Logo（如为深色方块底，在深色导航上加一圈描边以保持轮廓） */
.brand-logo img, .brand-logo-dark img { border-radius: 11px; }
.site-header:not(.is-scrolled) .brand-logo-dark img {
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .18), 0 8px 20px rgba(0, 0, 0, .35);
}

.nav { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.nav-link {
  position: relative; padding: 8px 14px; font-size: 15.5px; font-weight: 500;
  color: var(--ink-soft); border-radius: 10px; transition: .22s ease;
}
.site-header:not(.is-scrolled) .nav-link { color: rgba(255, 255, 255, .82); }
.nav-link:hover { color: var(--gold); }
.site-header:not(.is-scrolled) .nav-link:hover { color: #D9B779; }
.nav-link.is-active { color: var(--gold); font-weight: 600; }
.site-header:not(.is-scrolled) .nav-link.is-active { color: #D9B779; }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px;
  background: currentColor; border-radius: 2px;
}
.header-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer;
  flex-direction: column; justify-content: center; gap: 5px; padding: 0 10px;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }
.site-header:not(.is-scrolled) .nav-toggle span { background: #fff; }
.nav-toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2) { opacity: 0; }
.nav-toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ------------------------------------------------------------ 首页 Hero */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  padding: calc(var(--header-h) + 60px) 0 120px;
  background: radial-gradient(120% 120% at 20% 0%, #244E5C 0%, #16262E 45%, #0F1619 100%);
  color: rgba(255, 255, 255, .8); overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: url("../img/hero-ink.svg") bottom center / cover no-repeat; opacity: .9;
}
.hero::after {
  content: ""; position: absolute; width: 620px; height: 620px; right: -140px; top: -160px;
  background: radial-gradient(circle, rgba(185, 139, 62, .28), transparent 65%);
  filter: blur(10px); animation: float 14s ease-in-out infinite;
}
@keyframes float { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(-30px, 40px); } }
.hero .container { position: relative; z-index: 2; }
.hero-title {
  font-size: clamp(38px, 5.6vw, 68px); color: #fff; letter-spacing: .02em; line-height: 1.28;
  margin-bottom: 12px;
}
.hero-title em { font-style: normal; color: #E1BE7C; }
.hero-sub { font-size: clamp(16px, 1.6vw, 19px); max-width: 640px; margin-top: 24px; color: rgba(255, 255, 255, .74); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 32px 0 40px; }
.hero-tags span {
  font-size: 14px; padding: 6px 16px; border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .22); color: rgba(255, 255, 255, .82);
  background: rgba(255, 255, 255, .05);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }

.hero-stats {
  position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; margin-top: 88px; padding-top: 34px; border-top: 1px solid rgba(255, 255, 255, .14);
}
.hero-stats b { display: block; font-family: var(--serif); font-size: clamp(30px, 3.4vw, 44px); color: #E1BE7C; line-height: 1.1; }
.hero-stats span { font-size: 14.5px; color: rgba(255, 255, 255, .62); }

.scroll-hint {
  position: absolute; left: 50%; bottom: 34px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-size: 12px; letter-spacing: .2em; color: rgba(255, 255, 255, .5); z-index: 2;
}
.scroll-hint i { display: block; width: 1px; height: 40px; background: linear-gradient(rgba(255,255,255,.5), transparent); }

/* ------------------------------------------------------------ 内页 Hero */
.page-hero {
  position: relative; padding: calc(var(--header-h) + 88px) 0 88px;
  background: linear-gradient(135deg, #1C3A45 0%, #16262E 60%, #101A1E 100%);
  color: rgba(255, 255, 255, .78); overflow: hidden;
}
.page-hero::after {
  content: ""; position: absolute; width: 520px; height: 520px; right: -160px; top: -180px;
  background: radial-gradient(circle, rgba(185, 139, 62, .25), transparent 65%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(30px, 4vw, 46px); color: #fff; margin-bottom: 14px; }
.page-hero p { max-width: 660px; font-size: 17px; color: rgba(255, 255, 255, .68); }
.breadcrumb { font-size: 14px; color: rgba(255, 255, 255, .5); margin-bottom: 18px; }
.breadcrumb a:hover { color: #D9B779; }

/* ------------------------------------------------------------ 服务卡片 */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 34px 30px; transition: .3s ease; position: relative; overflow: hidden;
}
.card::after {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px;
  background: linear-gradient(90deg, #C99A4C, #A9762C); transform: scaleX(0); transform-origin: left; transition: .35s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card:hover::after { transform: scaleX(1); }
.card-ico {
  width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(31, 78, 95, .1), rgba(185, 139, 62, .16));
  color: var(--jade); margin-bottom: 20px;
}
.card-ico .icon { width: 26px; height: 26px; }
.card h3 { font-size: 21px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15.5px; }
.card ul { margin-top: 16px; display: grid; gap: 8px; }
.card ul li { display: flex; gap: 8px; font-size: 14.5px; color: var(--ink-soft); }
.card ul li .icon { width: 16px; height: 16px; color: var(--gold); margin-top: 4px; }

.card--dark {
  background: rgba(255, 255, 255, .04); border-color: rgba(255, 255, 255, .1); color: rgba(255, 255, 255, .7);
}
.card--dark h3 { color: #fff; }
.card--dark p { color: rgba(255, 255, 255, .62); }
.card--dark .card-ico { background: rgba(231, 200, 143, .12); color: #E1BE7C; }
.card--dark:hover { background: rgba(255, 255, 255, .07); }

/* ------------------------------------------------------------ 图文分栏 */
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.split.reverse .split-visual { order: -1; }
.split-list { display: grid; gap: 18px; margin-top: 28px; }
.split-list li { display: flex; gap: 14px; }
.split-list .icon { width: 22px; height: 22px; color: var(--gold); margin-top: 4px; }
.split-list b { display: block; font-family: var(--serif); font-size: 17px; color: var(--ink); }
.section--ink .split-list b, .section--grain .split-list b { color: #fff; }
.split-list p { font-size: 15px; color: var(--muted); }
.section--ink .split-list p, .section--grain .split-list p { color: rgba(255, 255, 255, .6); }

/* 数字人视觉 */
.dh-visual {
  position: relative; aspect-ratio: 1 / 1; border-radius: 28px; padding: 30px;
  background: linear-gradient(160deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, .02));
  border: 1px solid rgba(255, 255, 255, .12);
  box-shadow: var(--shadow-lg); display: grid; place-items: center; overflow: hidden;
}
.dh-orb {
  position: relative; width: 66%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #37697C, #162C36 70%);
  box-shadow: inset 0 0 60px rgba(0, 0, 0, .45), 0 0 60px rgba(58, 122, 145, .35);
  display: grid; place-items: center;
}
.dh-face {
  width: 58%; aspect-ratio: 1; border-radius: 50%;
  border: 1.5px solid rgba(231, 200, 143, .55); position: relative;
}
.dh-face::before, .dh-face::after {
  content: ""; position: absolute; width: 12%; aspect-ratio: 1; border-radius: 50%;
  background: #E1BE7C; top: 42%;
}
.dh-face::before { left: 22%; }
.dh-face::after { right: 22%; }
.dh-mouth {
  position: absolute; left: 50%; bottom: 26%; transform: translateX(-50%);
  width: 34%; height: 8%; border-bottom: 2px solid rgba(231, 200, 143, .6); border-radius: 0 0 40px 40px;
}
.dh-ring {
  position: absolute; inset: -14%; border-radius: 50%;
  border: 1px dashed rgba(231, 200, 143, .28); animation: spin 26s linear infinite;
}
.dh-ring.two { inset: -30%; border-style: solid; border-color: rgba(231, 200, 143, .12); animation-duration: 40s; animation-direction: reverse; }
@keyframes spin { to { transform: rotate(360deg); } }
.dh-node {
  position: absolute; width: 10px; height: 10px; border-radius: 50%; background: #E1BE7C;
  box-shadow: 0 0 12px rgba(225, 190, 124, .8);
}
.dh-node.n1 { top: 12%; left: 50%; }
.dh-node.n2 { bottom: 18%; left: 16%; }
.dh-node.n3 { bottom: 22%; right: 14%; }

.wave { display: flex; align-items: flex-end; gap: 5px; height: 42px; position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%); }
.wave i {
  display: block; width: 4px; border-radius: 4px; background: linear-gradient(#E1BE7C, rgba(225, 190, 124, .25));
  animation: wave 1.3s ease-in-out infinite;
}
.wave i:nth-child(1) { height: 40%; animation-delay: 0s; }
.wave i:nth-child(2) { height: 80%; animation-delay: .15s; }
.wave i:nth-child(3) { height: 55%; animation-delay: .3s; }
.wave i:nth-child(4) { height: 100%; animation-delay: .45s; }
.wave i:nth-child(5) { height: 65%; animation-delay: .6s; }
.wave i:nth-child(6) { height: 90%; animation-delay: .75s; }
.wave i:nth-child(7) { height: 45%; animation-delay: .9s; }
@keyframes wave { 0%, 100% { transform: scaleY(.35); } 50% { transform: scaleY(1); } }

/* ------------------------------------------------------------ 流程 */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
.step { position: relative; padding-top: 34px; }
.step::before {
  content: ""; position: absolute; top: 26px; left: 0; right: 0; height: 1px; background: var(--line);
}
.process .step:last-child::before { right: 50%; }
.process .step:first-child::before { left: 50%; }
.step-no {
  position: relative; width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center;
  background: var(--paper-2); border: 1px solid var(--line); font-family: var(--serif);
  font-size: 18px; color: var(--gold); margin-bottom: 18px; z-index: 1;
}
.step h4 { font-size: 18px; margin-bottom: 8px; }
.step p { font-size: 14.5px; color: var(--muted); }
.process-wrap { padding-top: 8px; }
.process-note { margin-top: 40px; text-align: center; color: var(--muted); font-size: 15px; }

/* ------------------------------------------------------------ 案例 */
.case-card {
  background: var(--paper-2); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line-soft); transition: .3s ease;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case-cover {
  position: relative; aspect-ratio: 4 / 3; display: grid; place-items: center;
  background: linear-gradient(135deg, #244E5C, #14212A); color: #E7C88F;
}
.case-cover b { font-family: var(--serif); font-size: 54px; letter-spacing: .1em; }
.case-cover span {
  position: absolute; bottom: 14px; left: 16px; font-size: 12px; padding: 4px 12px; border-radius: 999px;
  background: rgba(255, 255, 255, .14); color: #fff; backdrop-filter: blur(6px);
}
.case-card.alt .case-cover { background: linear-gradient(135deg, #3E3125, #1E1811); }
.case-card.alt2 .case-cover { background: linear-gradient(135deg, #2B4437, #16241C); }
.case-body { padding: 24px 26px 28px; }
.case-body h3 { font-size: 20px; margin-bottom: 8px; }
.case-body p { font-size: 15px; color: var(--muted); }
.case-meta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 16px; font-size: 13px; color: var(--gold); }
.case-meta span::before { content: "· "; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 44px; }
.filter-btn {
  border: 1px solid var(--line); background: transparent; border-radius: 999px;
  padding: 8px 22px; font-size: 15px; cursor: pointer; color: var(--ink-soft); transition: .22s;
  font-family: var(--sans);
}
.filter-btn:hover { border-color: var(--gold); color: var(--gold); }
.filter-btn.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }

/* ------------------------------------------------------------ 引言 */
.quote-band { text-align: center; padding: 110px 0; background: linear-gradient(180deg, #16262E, #101A1E); color: #fff; }
.quote-band .icon { width: 44px; height: 44px; color: #C99A4C; opacity: .8; margin-bottom: 24px; }
.quote-band blockquote {
  margin: 0 auto; max-width: 860px; font-family: var(--serif); font-size: clamp(22px, 3vw, 34px);
  line-height: 1.7; color: #fff;
}
.quote-band cite { display: block; margin-top: 26px; font-style: normal; font-size: 14px; letter-spacing: .2em; color: rgba(255, 255, 255, .5); }

/* ------------------------------------------------------------ CTA */
.cta-band {
  background: linear-gradient(120deg, #1F4E5F, #2E5F52 55%, #B98B3E 160%);
  border-radius: 28px; padding: 64px 56px; color: #fff;
  display: grid; grid-template-columns: 1.4fr auto; gap: 32px; align-items: center;
  box-shadow: var(--shadow-lg);
}
.cta-band h2 { color: #fff; font-size: clamp(24px, 3vw, 34px); margin-bottom: 10px; }
.cta-band p { color: rgba(255, 255, 255, .78); }

/* ------------------------------------------------------------ 数字人演示 */
.demo { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: stretch; }
.demo-panel {
  background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 26px; display: flex; flex-direction: column; box-shadow: var(--shadow-sm);
}
.demo-head { display: flex; align-items: center; gap: 14px; padding-bottom: 18px; border-bottom: 1px solid var(--line-soft); }
.demo-head .avatar {
  width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(135deg, #2C6274, #12262E); color: #E1BE7C; font-family: var(--serif); font-size: 20px;
}
.demo-head b { font-family: var(--serif); font-size: 17px; color: var(--ink); }
.demo-head span { display: block; font-size: 13px; color: var(--muted); }
.demo-status { margin-left: auto; font-size: 12.5px; color: #2E7D5B; display: flex; align-items: center; gap: 6px; }
.demo-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #2E7D5B; box-shadow: 0 0 0 4px rgba(46, 125, 91, .18); }

.demo-log { flex: 1; min-height: 300px; max-height: 380px; overflow-y: auto; padding: 20px 0; display: grid; gap: 16px; align-content: start; }
.msg { display: flex; gap: 12px; align-items: flex-start; }
.msg .avatar {
  width: 34px; height: 34px; border-radius: 50%; flex: none; display: grid; place-items: center;
  font-size: 14px; font-family: var(--serif);
}
.msg-ai .avatar { background: linear-gradient(135deg, #2C6274, #12262E); color: #E1BE7C; }
.msg-me { flex-direction: row-reverse; }
.msg-me .avatar { background: var(--ink); color: #fff; }
.msg p {
  padding: 12px 16px; border-radius: 14px; font-size: 15px; line-height: 1.7; max-width: 82%;
}
.msg-ai p { background: #F1EEE8; color: var(--ink-2); border-top-left-radius: 4px; }
.msg-me p { background: var(--ink); color: #fff; border-top-right-radius: 4px; }
.demo-typing { display: flex; gap: 6px; align-items: center; padding: 10px 14px; background: #F1EEE8; border-radius: 14px; width: fit-content; }
.demo-typing .dot { width: 7px; height: 7px; border-radius: 50%; background: #B3ADA2; animation: blink 1.2s infinite; }
.demo-typing .dot:nth-child(2) { animation-delay: .2s; }
.demo-typing .dot:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 60%, 100% { opacity: .3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }

.demo-asks { display: grid; gap: 10px; align-content: start; }
.demo-ask {
  text-align: left; border: 1px solid var(--line); background: var(--paper-2); border-radius: 14px;
  padding: 14px 18px; font-size: 15px; cursor: pointer; transition: .22s; font-family: var(--sans); color: var(--ink-2);
}
.demo-ask:hover { border-color: var(--gold); color: var(--gold); transform: translateX(4px); }

/* ------------------------------------------------------------ 表单 */
.form-card { background: var(--paper-2); border-radius: var(--radius); padding: 44px; box-shadow: var(--shadow); border: 1px solid var(--line-soft); }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 14.5px; font-weight: 600; margin-bottom: 8px; color: var(--ink); }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 16px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-size: 15.5px; font-family: var(--sans); background: #FDFCFA; color: var(--ink); transition: .2s;
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--gold); background: #fff; }
.field.has-error input, .field.has-error textarea { border-color: #C0503C; background: #FDF3F1; }
.field-inline { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field-check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--muted); }
.field-check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--gold); }
.form-tip { margin-top: 14px; font-size: 14.5px; color: #C0503C; }
.form-tip.is-ok { color: #2E7D5B; }

/* ------------------------------------------------------------ FAQ */
.faq { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 22px 0; background: none; border: 0; cursor: pointer; text-align: left;
  font-family: var(--serif); font-size: 18px; color: var(--ink); font-weight: 600;
}
.faq-q::after { content: "+"; font-family: var(--sans); font-size: 22px; color: var(--gold); transition: .25s; }
.faq-item.is-open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-item.is-open .faq-a { max-height: 400px; }
.faq-a p { padding-bottom: 22px; color: var(--muted); font-size: 15.5px; }

/* ------------------------------------------------------------ 联系信息 */
.info-card {
  background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 28px; display: flex; gap: 18px; transition: .3s;
}
.info-card:hover { box-shadow: var(--shadow-sm); transform: translateY(-3px); }
.info-card .icon { width: 24px; height: 24px; color: var(--gold); margin-top: 4px; }
.info-card b { display: block; font-family: var(--serif); font-size: 17px; color: var(--ink); margin-bottom: 4px; }
.info-card p { font-size: 15px; color: var(--muted); }

/* ------------------------------------------------------------ 时间线（关于） */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item::before {
  content: ""; position: absolute; left: -32px; top: 8px; width: 15px; height: 15px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--gold);
}
.tl-year { font-family: var(--serif); font-size: 20px; color: var(--gold); margin-bottom: 4px; }
.tl-item h4 { font-size: 18px; margin-bottom: 6px; }
.tl-item p { color: var(--muted); font-size: 15.5px; }

/* ------------------------------------------------------------ 页脚 */
.site-footer { background: #121A1E; color: rgba(255, 255, 255, .6); padding-top: 72px; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 44px; padding-bottom: 48px; }
.site-footer .brand .brand-name b { color: #fff; }
.site-footer .brand .brand-name i { color: rgba(255, 255, 255, .45); }
.footer-slogan { margin-top: 18px; font-family: var(--serif); font-size: 17px; color: rgba(255, 255, 255, .8); }
.footer-slogan span { font-family: var(--sans); font-size: 14px; color: rgba(255, 255, 255, .45); }
.footer-contact { margin-top: 22px; display: grid; gap: 10px; font-size: 14.5px; }
.footer-contact p { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact .icon { width: 18px; height: 18px; color: #B98B3E; margin-top: 4px; }
.footer-col h4 { color: #fff; font-size: 17px; margin-bottom: 18px; }
.footer-col ul { display: grid; gap: 12px; font-size: 14.5px; }
.footer-col a:hover { color: #D9B779; }
.footer-meta li { line-height: 1.7; }
.footer-meta .btn { margin-top: 8px; border-color: rgba(255, 255, 255, .3); color: #fff; }
.footer-meta .btn:hover { background: rgba(255, 255, 255, .08); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1); padding: 22px 0 34px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13.5px;
}

/* ------------------------------------------------------------ 下载页 */
.dl-hero-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.dl-hero-copy h1 { color: #fff; font-size: clamp(30px, 4vw, 46px); margin-bottom: 18px; }
.dl-hero-copy p { color: rgba(255, 255, 255, .7); font-size: 17px; max-width: 560px; }
.dl-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.dl-badges span {
  font-size: 13.5px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .2); color: rgba(255, 255, 255, .8);
}
.dl-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }

/* 手机预览 */
.phone {
  position: relative; width: 280px; margin: 0 auto;
  aspect-ratio: 9 / 19.2; border-radius: 44px; padding: 12px;
  background: #1c2126; box-shadow: 0 30px 80px rgba(0, 0, 0, .45), inset 0 0 0 2px rgba(255, 255, 255, .06);
}
.phone::before {
  content: ""; position: absolute; top: 18px; left: 50%; transform: translateX(-50%);
  width: 96px; height: 22px; background: #1c2126; border-radius: 0 0 16px 16px; z-index: 2;
}
.phone-screen {
  position: relative; width: 100%; height: 100%; border-radius: 34px; overflow: hidden;
  background: linear-gradient(180deg, #1B2D34 0%, #122126 60%, #0E1A1D 100%);
  color: rgba(255, 255, 255, .86); padding: 56px 18px 22px;
  display: flex; flex-direction: column; gap: 14px;
}
.phone-greet { display: flex; align-items: center; gap: 10px; }
.phone-greet b { font-family: var(--serif); font-size: 18px; }
.phone-greet i { font-style: normal; font-size: 11.5px; color: rgba(255, 255, 255, .55); display: block; }
.phone-card {
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 16px; padding: 14px; display: flex; flex-direction: column; gap: 10px;
}
.phone-card .pc-ico {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, #C99A4C, #8C6937); color: #fff; font-family: var(--serif);
}
.phone-card b { font-size: 14px; color: #fff; }
.phone-card .bar { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, .1); overflow: hidden; }
.phone-card .bar i { display: block; width: 62%; height: 100%; background: linear-gradient(90deg, #C99A4C, #E1BE7C); border-radius: 3px; }
.phone-card .meta { display: flex; justify-content: space-between; font-size: 11.5px; color: rgba(255, 255, 255, .55); }
.phone-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 12px; background: rgba(255, 255, 255, .04); }
.phone-row .pr-ico { width: 28px; height: 28px; border-radius: 8px; background: rgba(225, 190, 124, .16); color: #E1BE7C; display: grid; place-items: center; }
.phone-row b { font-size: 13px; color: #fff; flex: 1; }
.phone-row span { font-size: 11px; color: rgba(255, 255, 255, .5); }
.phone-row .pr-ico .icon { width: 17px; height: 17px; }
.phone-card .pc-title { display: block; font-size: 13px; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.phone-card .pc-sub { display: block; font-style: normal; font-size: 11px; color: rgba(255, 255, 255, .55); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.phone-tabbar {
  margin-top: auto; display: flex; justify-content: space-between; padding: 12px 4px 2px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}
.phone-tabbar span {
  flex: 1; display: grid; justify-items: center; gap: 5px;
  font-size: 10.5px; color: rgba(255, 255, 255, .42);
}
.phone-tabbar span i { font-style: normal; }
.phone-tabbar .icon { width: 18px; height: 18px; }
.phone-tabbar .on { color: #E1BE7C; }

/* 平台下载卡 */
.dl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.dl-card {
  position: relative; background: var(--paper-2); border-radius: 24px; padding: 40px 36px;
  border: 1px solid var(--line-soft); box-shadow: var(--shadow-sm); overflow: hidden;
}
.dl-card::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px;
}
.dl-card.and::before { background: linear-gradient(90deg, #3DDC84, #2EA468); }
.dl-card.ios::before { background: linear-gradient(90deg, #1F4E5F, #B98B3E); }
.dl-card-head { display: flex; align-items: center; gap: 18px; margin-bottom: 26px; }
.platform-ico {
  width: 60px; height: 60px; border-radius: 16px; display: grid; place-items: center;
  color: #fff; font-family: var(--serif); font-size: 26px;
}
.dl-card.and .platform-ico { background: linear-gradient(135deg, #3DDC84, #1E7A4A); }
.dl-card.ios .platform-ico { background: linear-gradient(135deg, #2B3A45, #15181C); }
.platform-ico .icon { width: 30px; height: 30px; }
.dl-card-head h3 { font-size: 24px; margin-bottom: 2px; }
.dl-card-head p { color: var(--muted); font-size: 14.5px; }

.dl-meta { display: grid; gap: 10px; padding: 18px; background: var(--paper); border-radius: 14px; margin-bottom: 22px; }
.dl-meta .row { display: flex; justify-content: space-between; align-items: center; font-size: 14.5px; }
.dl-meta .row span { color: var(--muted); }
.dl-meta .row b { color: var(--ink); font-weight: 600; font-family: var(--serif); }
.dl-meta .row b.vers { color: var(--gold); }

.dl-action { display: grid; grid-template-columns: 1fr auto; gap: 22px; align-items: center; }
.btn-dl {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 56px; padding: 0 28px; border-radius: 14px; font-size: 16px; font-weight: 600;
  border: 0; cursor: pointer; font-family: var(--sans); transition: .25s; color: #fff; text-align: center;
}
.btn-dl .icon { width: 20px; height: 20px; }
.dl-card.and .btn-dl { background: linear-gradient(135deg, #3DDC84, #1E7A4A); box-shadow: 0 12px 30px rgba(29, 122, 74, .28); }
.dl-card.ios .btn-dl { background: linear-gradient(135deg, #2B3A45, #15181C); box-shadow: 0 12px 30px rgba(21, 24, 28, .28); }
.btn-dl:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn-dl[href="#"], .btn-dl.is-disabled {
  background: linear-gradient(135deg, #B6B0A6, #8C8579); box-shadow: none; cursor: not-allowed;
}
.btn-dl[href="#"]:hover, .btn-dl.is-disabled:hover { transform: none; }
.btn-dl.is-disabled { pointer-events: none; }

.dl-note { margin-top: 14px; font-size: 13.5px; color: var(--muted); display: flex; gap: 8px; }
.dl-note .icon { width: 16px; height: 16px; color: var(--gold); margin-top: 3px; }

/* 二维码 */
.qr-box {
  position: relative; width: 132px; height: 132px; padding: 10px; background: #fff;
  border: 1px solid var(--line); border-radius: 14px; display: grid; place-items: center;
}
.qr-box img { width: 100%; height: 100%; object-fit: contain; display: block; }
.qr-box .qr-empty {
  width: 100%; height: 100%; border: 1.5px dashed var(--line); border-radius: 8px;
  display: grid; place-items: center; color: var(--muted); font-size: 11px; text-align: center; padding: 6px;
}
.qr-box .qr-empty .icon { width: 22px; height: 22px; color: var(--ink-soft); opacity: .4; margin-bottom: 4px; }
.qr-cap { font-size: 12.5px; color: var(--muted); margin-top: 8px; text-align: center; }

/* 安装步骤 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step-card {
  background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 18px; padding: 28px 26px; color: rgba(255, 255, 255, .78);
}
.step-card .no {
  display: inline-block; font-family: var(--serif); font-size: 16px; color: #E1BE7C;
  padding: 2px 12px; border: 1px solid rgba(225, 190, 124, .4); border-radius: 999px; margin-bottom: 16px;
}
.step-card h4 { color: #fff; font-size: 19px; margin-bottom: 8px; }
.step-card p { color: rgba(255, 255, 255, .6); font-size: 14.5px; }
.step-card ul { margin-top: 14px; display: grid; gap: 8px; font-size: 14px; color: rgba(255, 255, 255, .66); }
.step-card ul li { display: flex; gap: 8px; }
.step-card ul li::before { content: "·"; color: #E1BE7C; }

/* 更新日志 */
.rel-list { display: grid; gap: 18px; max-width: 860px; margin: 0 auto; }
.rel {
  background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: 18px; padding: 28px 30px;
  display: grid; grid-template-columns: 200px 1fr; gap: 24px; align-items: start;
}
.rel .head { display: flex; flex-direction: column; gap: 6px; }
.rel .v { font-family: var(--serif); font-size: 22px; color: var(--ink); display: flex; align-items: center; gap: 10px; }
.rel .tag {
  display: inline-block; font-size: 11px; padding: 2px 10px; border-radius: 999px;
  background: linear-gradient(135deg, #C99A4C, #8C6937); color: #fff; font-family: var(--sans); letter-spacing: .04em;
}
.rel .d { font-size: 14px; color: var(--muted); }
.rel ul { display: grid; gap: 8px; font-size: 15px; color: var(--ink-2); }
.rel ul li { display: flex; gap: 10px; }
.rel ul li .icon { width: 18px; height: 18px; color: var(--gold); margin-top: 3px; flex: none; }

/* 特性 / 安全 */
.spec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.spec {
  background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: 16px; padding: 24px;
  display: flex; gap: 14px; align-items: flex-start;
}
.spec .icon { width: 24px; height: 24px; color: var(--gold); margin-top: 2px; }
.spec b { display: block; font-family: var(--serif); font-size: 16.5px; color: var(--ink); margin-bottom: 4px; }
.spec p { font-size: 14.5px; color: var(--muted); }

@media (max-width: 1024px) {
  .dl-hero-wrap, .dl-grid, .steps, .spec-grid { grid-template-columns: 1fr; }
  .rel { grid-template-columns: 1fr; gap: 10px; }
}

/* ------------------------------------------------------------ 响应式 */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); gap: 32px 20px; }
  .step::before { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .split, .demo { grid-template-columns: 1fr; gap: 40px; }
  .split.reverse .split-visual { order: 0; }
  .cta-band { grid-template-columns: 1fr; padding: 44px 32px; }
  /* 导航项较多，中等屏幕收紧间距，避免换行 */
  .nav-link { padding: 8px 9px; font-size: 14.5px; }
  .brand-name i { display: none; }
  .header-actions .btn-sm { padding: 0 16px; }
}

@media (max-width: 860px) {
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; align-items: stretch;
    background: var(--paper); padding: 18px 24px 28px; gap: 4px;
    box-shadow: 0 20px 40px rgba(21, 24, 28, .12);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .25s ease;
    max-height: calc(100vh - var(--header-h)); overflow-y: auto;
  }
  .nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-link { padding: 14px 8px; font-size: 17px; color: var(--ink) !important; border-bottom: 1px solid var(--line-soft); }
  .nav-link.is-active::after { display: none; }
  .nav-toggle { display: flex; }
  .header-actions .btn { display: none; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; margin-top: 60px; }
  .section { padding: 68px 0; }
  .form-card { padding: 28px 22px; }
  .field-inline { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 620px) {
  .grid-3, .grid-4, .process { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 34px; }
  .hero { min-height: auto; padding: calc(var(--header-h) + 48px) 0 80px; }
  .scroll-hint { display: none; }
  .brand-name i { display: none; }
  .quote-band { padding: 72px 0; }
}