/* 北京花声智能科技有限公司 · 单位门户网站
   纯静态、零外部资源（不引用任何境外字体/CDN），国内访问快。 */

:root {
  --ink: #2B2530;
  --ink-soft: #5E5664;
  --ink-mute: #8C8492;
  --paper: #FFFBF7;
  --paper-2: #FFF3EE;
  --card: #FFFFFF;
  --line: #EFE4E0;
  --sakura: #E84577;
  --sakura-soft: #FFE3EC;
  --sakura-ink: #B02456;
  --spring: #1A9E91;
  --spring-soft: #DDF5F2;
  --sun: #F5B800;
  --sun-soft: #FFF4CC;
  --night: #1E2233;
  --radius: 18px;
  --shadow: 0 1px 2px rgba(43, 37, 48, .04), 0 8px 24px rgba(43, 37, 48, .06);
  --max: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", SimSun, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--sakura); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 251, 247, .88);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: .02em; white-space: nowrap; }
.brand img { width: 32px; height: 32px; }
.brand small { display: block; font-size: 11px; font-weight: 400; color: var(--ink-mute); letter-spacing: .12em; line-height: 1.2; }
.brand span { line-height: 1.25; }
.menu { display: flex; gap: 4px; list-style: none; }
.menu a { display: block; padding: 8px 14px; border-radius: 999px; font-size: 15px; color: var(--ink-soft); transition: background .2s, color .2s; }
.menu a:hover { background: var(--sakura-soft); color: var(--sakura-ink); }
.menu a[aria-current="page"] { color: var(--sakura-ink); font-weight: 600; }

/* ---------- 通用排版 ---------- */
section { padding: 88px 0; }
.eyebrow { display: inline-block; font-size: 13px; letter-spacing: .18em; color: var(--sakura-ink); font-weight: 600; margin-bottom: 14px; }
h1, h2, h3 { line-height: 1.3; font-weight: 700; letter-spacing: .01em; }
h1 { font-size: clamp(32px, 5.2vw, 52px); }
h2 { font-size: clamp(26px, 3.6vw, 36px); margin-bottom: 16px; }
h3 { font-size: 19px; margin-bottom: 8px; }
.lead { font-size: clamp(16px, 1.8vw, 19px); color: var(--ink-soft); max-width: 640px; }
.sec-head { max-width: 720px; margin-bottom: 48px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.serif { font-family: var(--serif); }
.muted { color: var(--ink-mute); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 16px;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn-primary { background: var(--sakura); color: #fff; box-shadow: 0 6px 18px rgba(232, 69, 119, .28); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(232, 69, 119, .34); }
.btn-ghost { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--sakura); color: var(--sakura-ink); }

/* ---------- 首屏 ---------- */
.hero { padding: 72px 0 96px; background: radial-gradient(1200px 520px at 85% -10%, #FFE3EC 0%, transparent 60%), radial-gradient(900px 480px at -10% 110%, #DDF5F2 0%, transparent 55%); }
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.hero h1 em { font-style: normal; color: var(--sakura); }
.hero .lead { margin: 22px 0 34px; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.tag { font-size: 13px; padding: 6px 12px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); color: var(--ink-soft); }

/* 设备插画 */
.device { position: relative; width: min(320px, 82vw); margin: 0 auto; aspect-ratio: 10 / 19; border-radius: 44px; background: linear-gradient(160deg, #6CA8F0, #3E7FD8); padding: 12px; box-shadow: 0 30px 60px -20px rgba(30, 60, 120, .45), inset 0 1px 0 rgba(255,255,255,.4); }
.device::after { content: ""; position: absolute; left: 50%; bottom: -34px; width: 70%; height: 22px; transform: translateX(-50%); background: radial-gradient(closest-side, rgba(30, 40, 80, .22), transparent); }
.screen { height: 100%; border-radius: 34px; background: #FFF8F4; overflow: hidden; display: flex; flex-direction: column; }
.screen-top { padding: 18px 18px 12px; display: flex; align-items: center; gap: 10px; border-bottom: 1px solid #F3E6E0; }
.screen-top .dot { width: 30px; height: 30px; border-radius: 50%; background: var(--sakura-soft); display: grid; place-items: center; }
.screen-top b { font-size: 14px; }
.screen-top i { font-style: normal; font-size: 11px; color: var(--ink-mute); display: block; }
.chat { flex: 1; padding: 14px; display: flex; flex-direction: column; gap: 10px; font-size: 13px; line-height: 1.55; }
.bubble { max-width: 84%; padding: 9px 12px; border-radius: 14px; }
.bubble.kid { align-self: flex-end; background: #3E7FD8; color: #fff; border-bottom-right-radius: 4px; }
.bubble.ai { align-self: flex-start; background: #fff; border: 1px solid #F0E3DD; border-bottom-left-radius: 4px; }
.bubble.ai b { color: var(--sakura-ink); }
.photo { align-self: flex-end; width: 62%; padding: 10px; border-radius: 12px; background: #fff; border: 1px dashed #C9D6EC; font-family: var(--serif); font-size: 12px; color: #4A5A78; }
.screen-bar { display: flex; gap: 8px; padding: 12px 14px 18px; }
.screen-bar span { flex: 1; text-align: center; font-size: 12px; padding: 9px 0; border-radius: 999px; background: #fff; border: 1px solid #F0E3DD; color: var(--ink-soft); }
.screen-bar span.on { background: var(--sakura); border-color: var(--sakura); color: #fff; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.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(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.card p { color: var(--ink-soft); font-size: 15px; }
.icon { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 18px; }
.icon svg { width: 24px; height: 24px; }
.i-pink { background: var(--sakura-soft); color: var(--sakura-ink); }
.i-teal { background: var(--spring-soft); color: var(--spring); }
.i-sun { background: var(--sun-soft); color: #A67C00; }

.band { background: var(--paper-2); }
.dark { background: var(--night); color: #F4EEF2; }
.dark .lead, .dark p { color: #C9C1CF; }
.dark .eyebrow { color: #FF9EBE; }
.dark .card { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.08); box-shadow: none; }

/* 步骤 */
.steps { counter-reset: s; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { position: relative; padding: 28px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); }
.step::before { counter-increment: s; content: "0" counter(s); font-family: var(--serif); font-size: 40px; font-weight: 700; color: var(--sakura); opacity: .9; display: block; line-height: 1; margin-bottom: 14px; }
.step p { color: var(--ink-soft); font-size: 15px; }

/* 两栏图文 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.checks { list-style: none; display: grid; gap: 14px; margin-top: 24px; }
.checks li { display: flex; gap: 12px; color: var(--ink-soft); }
.checks li::before { content: ""; flex: 0 0 22px; height: 22px; margin-top: 3px; border-radius: 50%; background: var(--spring-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231A9E91' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center / 14px no-repeat; }
.checks b { color: var(--ink); }

/* 家长报告卡 */
.report { background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 26px; box-shadow: var(--shadow); max-width: 420px; margin: 0 auto; }
.report-head { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: 14px; border-bottom: 1px dashed var(--line); margin-bottom: 16px; }
.report-head b { font-size: 17px; }
.report-head span { font-size: 13px; color: var(--ink-mute); }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.kpi { background: var(--paper); border-radius: 12px; padding: 12px; text-align: center; }
.kpi b { display: block; font-size: 22px; color: var(--sakura-ink); line-height: 1.2; }
.kpi span { font-size: 12px; color: var(--ink-mute); }
.bars { display: grid; gap: 10px; font-size: 13px; color: var(--ink-soft); }
.bar { display: grid; grid-template-columns: 44px 1fr; gap: 10px; align-items: center; }
.bar i { display: block; height: 8px; border-radius: 99px; background: linear-gradient(90deg, var(--sakura), #FF9EBE); }
.report-note { margin-top: 16px; font-size: 13px; color: var(--ink-soft); background: var(--sun-soft); border-radius: 12px; padding: 10px 12px; }
.demo-note { text-align: center; font-size: 12px; color: var(--ink-mute); margin-top: 12px; }

/* 页面头 */
.page-head { padding: 72px 0 48px; background: radial-gradient(900px 400px at 90% -20%, #FFE3EC 0%, transparent 60%); border-bottom: 1px solid var(--line); }
.page-head .lead { margin-top: 14px; }
.crumbs { font-size: 13px; color: var(--ink-mute); margin-bottom: 18px; }
.crumbs a:hover { color: var(--sakura-ink); }

/* 正文页 */
.prose { max-width: 760px; }
.prose h2 { font-size: 24px; margin: 44px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--ink-soft); margin-bottom: 14px; }
.prose ul { padding-left: 1.2em; color: var(--ink-soft); margin-bottom: 14px; }
.prose li { margin-bottom: 6px; }

/* 信息表 */
.info { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.info th, .info td { text-align: left; padding: 16px 22px; border-bottom: 1px solid var(--line); vertical-align: top; font-size: 15px; }
.info tr:last-child th, .info tr:last-child td { border-bottom: 0; }
.info th { width: 168px; color: var(--ink-mute); font-weight: 500; background: var(--paper); }
.info a { color: var(--sakura-ink); }

/* 时间线 */
.timeline { list-style: none; border-left: 2px solid var(--sakura-soft); padding-left: 26px; display: grid; gap: 26px; }
.timeline li { position: relative; }
.timeline li::before { content: ""; position: absolute; left: -33px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: var(--sakura); box-shadow: 0 0 0 4px var(--sakura-soft); }
.timeline b { display: block; margin-bottom: 2px; }
.timeline p { color: var(--ink-soft); font-size: 15px; }

/* 联系卡 */
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item .icon { margin: 0; flex: 0 0 46px; }
.contact-item b { display: block; font-size: 14px; color: var(--ink-mute); font-weight: 500; }
.contact-item span { font-size: 17px; font-weight: 600; word-break: break-all; }

/* CTA */
.cta { text-align: center; }
.cta h2 { margin-bottom: 12px; }
.cta .lead { margin: 0 auto 30px; }

/* 首屏业务概览 */
.biz-stack { display: grid; gap: 14px; }
.biz-card { display: grid; grid-template-columns: 46px 1fr auto; gap: 16px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.biz-card .icon { margin: 0; }
.biz-card b { display: block; font-size: 17px; }
.biz-card span { font-size: 14px; color: var(--ink-soft); }
.badge { font-style: normal; font-size: 12px; padding: 4px 10px; border-radius: 999px; background: var(--sun-soft); color: #8A6400; white-space: nowrap; }
.badge.on { background: var(--spring-soft); color: var(--spring); }
@media (max-width: 640px) { .biz-card { grid-template-columns: 40px 1fr; } .biz-card .badge { grid-column: 2; justify-self: start; } .biz-card .icon { width: 40px; height: 40px; } }

/* ---------- 页脚 ---------- */
footer { background: #17192A; color: #A9A2B0; font-size: 14px; padding: 56px 0 32px; }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.08); }
footer h4 { color: #F4EEF2; font-size: 15px; margin-bottom: 14px; font-weight: 600; }
footer ul { list-style: none; display: grid; gap: 8px; }
footer a:hover { color: #fff; }
footer .brand { color: #F4EEF2; margin-bottom: 14px; }
footer .brand small { color: #7D7686; }
.legal { padding-top: 24px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; font-size: 13px; color: #8A8392; }
.legal a { color: #A9A2B0; }
.legal a:hover { color: #fff; text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .hero .wrap, .split { grid-template-columns: 1fr; gap: 48px; }
  .grid-3, .steps { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  footer .cols { grid-template-columns: 1fr 1fr; }
  footer .cols > :first-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  section { padding: 64px 0; }
  .wrap { padding: 0 16px; }
  .nav .wrap { height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
  .menu { width: 100%; justify-content: space-between; gap: 0; }
  .menu a { padding: 6px 10px; font-size: 14px; }
  .grid-3, .grid-2, .grid-4, .steps { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 72px; }
  .info th { width: 96px; padding: 14px; }
  .info td { padding: 14px; }
  footer .cols { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}