/* 鸿芯合韵 官网 — 样式
   字体使用系统字体栈,不依赖 Google Fonts(国内网络下不稳定) */
:root {
  --bg: #F3F4F0;
  --ink: #12161C;
  --muted: #55606B;
  --accent: #C8341C;
  --accent-dark: #FF7A5C;
  --line: #D5D8D2;
  --panel: #E3E6E0;
  --white: #FFFFFF;
  --dark-line: #2A323B;
  --dark-muted: #A3ADB6;
  --sans: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 16px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a.lnk:hover { color: var(--accent); }
a.btn:hover { opacity: .88; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
img, video { max-width: 100%; }
h1, h2, h3, p, dl, figure { margin: 0; }

.wrap { max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.mono { font-family: var(--mono); }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .2em; color: var(--accent); }
.eyebrow.muted { color: var(--muted); }
h2.title { margin-top: 12px; font-weight: 900; font-size: clamp(30px, 4vw, 44px); line-height: 1.2; }
.lead { margin-top: 16px; max-width: 640px; color: var(--muted); font-size: 17px; }

/* NAV */
.nav { padding-top: 20px; padding-bottom: 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { position: relative; width: 60px; height: 34px; overflow: hidden; flex: none; }
.brand-logo img { position: absolute; left: -42.8px; top: -14.6px; width: 146.3px; height: auto; max-width: none; }
.brand-name { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name b { font-weight: 900; font-size: 20px; letter-spacing: .04em; }
.brand-name span { font-family: var(--mono); font-size: 10px; letter-spacing: .22em; color: var(--muted); }
.nav-links { display: flex; flex-wrap: wrap; gap: 8px 28px; font-size: 15px; font-weight: 500; }
.btn { display: flex; align-items: center; min-height: 44px; padding: 10px 22px; font-weight: 500; font-size: 15px; }
.btn-dark { background: var(--ink); color: var(--bg); }
.btn-accent { background: var(--accent); color: var(--white); min-height: 48px; padding: 12px 28px; font-size: 16px; }
.btn-outline { border: 1.5px solid var(--ink); min-height: 48px; padding: 12px 28px; font-size: 16px; }

/* HERO */
.hero { padding-top: 56px; padding-bottom: 88px; display: flex; flex-wrap: wrap; gap: 56px; align-items: center; }
.hero-text { flex: 1 1 480px; min-width: 0; }
.hero-text .eyebrow { margin-bottom: 24px; }
.hero h1 { font-weight: 900; font-size: clamp(40px, 6vw, 72px); line-height: 1.08; letter-spacing: -.01em; }
.hero p { margin-top: 28px; max-width: 520px; font-size: 18px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.stack { flex: 1 1 420px; min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.stack-head { background: var(--ink); color: #E9ECE8; padding: 20px 22px; }
.stack-head-row { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px; }
.stack-head-row b { font-size: 18px; }
.stack-head-row span { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--dark-muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; font-family: var(--mono); font-size: 12px; }
.chips span { border: 1px solid var(--dark-line); padding: 4px 12px; }
.stack-label { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; color: var(--muted); padding: 2px; }
.stack-row { display: flex; flex-wrap: wrap; gap: 10px; }
.stack-device { flex: 1 1 120px; min-width: 0; border: 1.5px solid var(--ink); padding: 14px; background: var(--white); }
.stack-device b { display: block; }
.stack-device small { font-size: 13px; color: var(--muted); }
.stack-card { flex: 1 1 120px; min-width: 0; background: var(--panel); padding: 12px 14px; font-size: 14px; font-weight: 500; }

/* STRATEGY */
.strip { border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); }
.strip .wrap { padding-top: 0; padding-bottom: 0; display: flex; flex-wrap: wrap; }
.strip-item { flex: 1 1 300px; min-width: 0; padding: 36px 28px; display: flex; gap: 20px; align-items: baseline; }
.strip-item:first-child { padding-left: 0; }
.strip-item:last-child { padding-right: 0; }
.strip-num { font-weight: 900; font-size: 64px; line-height: 1; color: var(--accent); }
.strip-item b { display: block; font-size: 20px; }
.strip-item span.d { display: block; color: var(--muted); font-size: 15px; }

/* SECTIONS */
.section { padding-top: 96px; padding-bottom: 96px; }

/* PRODUCT CARDS */
.cards { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 48px; }
.card { flex: 1 1 320px; min-width: 0; background: var(--white); border: 1.5px solid var(--ink); display: flex; flex-direction: column; }
.card-img { position: relative; height: 220px; background: var(--white); border-bottom: 1.5px solid var(--ink); overflow: hidden; }
.card-img img { display: block; width: 100%; height: 100%; object-fit: contain; }
.card-img .note { position: absolute; left: 12px; bottom: 8px; font-family: var(--mono); font-size: 11px; letter-spacing: .08em; color: var(--muted); }
.card-body { padding: 28px 26px 30px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.card-title { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.card-title h3 { font-weight: 700; font-size: 24px; }
.tag { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; padding: 3px 10px; }
.tag-dark { background: var(--ink); color: var(--bg); }
.tag-accent { background: var(--accent); color: var(--white); }
.tag-line { border: 1.5px solid var(--ink); padding: 1px 10px; }
.card-body p { color: var(--muted); font-size: 15px; }
.spec { margin-top: 6px; display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 8px 12px; font-size: 14px; border-top: 1px solid var(--line); padding-top: 16px; }
.spec dt { color: var(--muted); }
.spec dd { margin: 0; }

/* DETAIL BLOCKS */
.detail { margin-top: 72px; }
.figs { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; }
.fig { flex: 1 1 540px; min-width: 0; background: var(--white); border: 1.5px solid var(--ink); }
.fig.sm { flex-basis: 280px; }
.fig img { display: block; width: 100%; height: 340px; object-fit: contain; }
.fig.wide { margin-top: 16px; }
.fig.wide img { height: 200px; }
.fig.h300 img { height: 300px; }
.fig figcaption { padding: 12px 18px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
.split { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; align-items: flex-start; }
.split-figs { flex: 1 1 420px; min-width: 0; display: flex; flex-direction: column; gap: 16px; }
.split-figs .fig { margin: 0; }
.table { flex: 1 1 480px; min-width: 0; background: var(--white); border: 1.5px solid var(--ink); display: grid; grid-template-columns: 112px minmax(0, 1fr); font-size: 15px; }
.table div { padding: 14px 18px; border-bottom: 1px solid var(--line); }
.table div:nth-child(odd) { color: var(--muted); }
.table div:nth-last-child(-n+2) { border-bottom: 0; }

/* PLATFORM (dark) */
.dark { background: var(--ink); color: #E9ECE8; }
.dark .wrap { padding-top: 96px; padding-bottom: 96px; display: flex; flex-wrap: wrap; gap: 56px; }
.dark .eyebrow { color: var(--accent-dark); }
.dark .col { flex: 1 1 420px; min-width: 0; }
.dark .lead { max-width: 520px; margin-top: 20px; color: var(--dark-muted); }
.steps { display: flex; flex-direction: column; margin-top: 36px; border-top: 1px solid var(--dark-line); }
.step { display: flex; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--dark-line); align-items: baseline; }
.step i { font-style: normal; font-family: var(--mono); color: var(--accent-dark); font-size: 13px; }
.step b { display: block; }
.step span { display: block; color: var(--dark-muted); font-size: 15px; }
.col-right { display: flex; flex-direction: column; gap: 16px; }
.box { border: 1px solid var(--dark-line); padding: 24px; }
.box-label { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; color: var(--dark-muted); }
.code { margin-top: 14px; font-family: var(--mono); font-size: 13px; line-height: 1.9; overflow-wrap: anywhere; color: #E9ECE8; }
.box p { margin-top: 16px; color: var(--dark-muted); font-size: 14px; }
.cardlist { display: flex; flex-direction: column; margin-top: 10px; }
.cardlist div { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--dark-line); }
.cardlist div:last-child { border-bottom: 0; }
.cardlist b { font-weight: 500; }
.cardlist span { color: var(--dark-muted); font-size: 14px; }

/* SCENES */
.scenes { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 48px; }
.scene { flex: 1 1 440px; min-width: 0; border: 1.5px solid var(--ink); background: var(--white); padding: 32px 30px; }
.scene .eyebrow { font-size: 11px; letter-spacing: .16em; }
.scene-list { display: flex; flex-direction: column; margin-top: 16px; }
.scene-list div { padding: 16px 0; border-top: 1px solid var(--line); }
.scene-list b { display: block; font-size: 20px; }
.scene-list span { display: block; color: var(--muted); font-size: 15px; }
.demo-label { margin-top: 72px; }
.demos { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 20px; }
.demo { flex: 1 1 440px; min-width: 0; border: 1.5px solid var(--ink); background: var(--white); display: flex; flex-direction: column; }
.demo video { display: block; width: 100%; aspect-ratio: 16 / 10; background: var(--ink); border-bottom: 1.5px solid var(--ink); }
.demo-body { padding: 22px 26px 26px; }
.demo-body .eyebrow { font-size: 11px; letter-spacing: .16em; }
.demo-body h3 { font-weight: 900; font-size: 22px; margin-top: 8px; }
.demo-body p { color: var(--muted); font-size: 15px; margin-top: 8px; }

/* COOPERATE */
.coop { background: var(--panel); }
.coop .wrap { padding-top: 88px; padding-bottom: 88px; }
.coop-items { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 44px; }
.coop-item { flex: 1 1 300px; min-width: 0; background: var(--bg); padding: 30px 28px; }
.coop-item .mono { font-size: 13px; color: var(--accent); }
.coop-item h3 { margin-top: 8px; font-weight: 700; font-size: 22px; }
.coop-item p { margin-top: 12px; color: var(--muted); font-size: 15px; }

/* CTA */
.cta { display: flex; flex-wrap: wrap; gap: 32px; align-items: center; justify-content: space-between; }
.cta-text { flex: 1 1 480px; min-width: 0; }
.cta h2 { font-weight: 900; font-size: clamp(30px, 4.4vw, 52px); line-height: 1.15; }
.cta p { margin-top: 16px; color: var(--muted); font-size: 17px; max-width: 520px; }
.cta .btn { padding: 14px 36px; font-size: 17px; min-height: 52px; }

/* FOOTER */
.footer { border-top: 1.5px solid var(--ink); }
.footer .wrap { padding-top: 32px; padding-bottom: 44px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; font-size: 14px; color: var(--muted); }
.footer-l { flex: 1 1 480px; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.footer-l b { color: var(--ink); font-weight: 500; }
.footer-r { display: flex; flex-direction: column; gap: 4px; text-align: right; }
.footer-r a:hover { color: var(--accent); }

@media (max-width: 640px) {
  .section { padding-top: 64px; padding-bottom: 64px; }
  .hero { padding-bottom: 56px; gap: 40px; }
  .strip-item, .strip-item:first-child, .strip-item:last-child { padding: 28px 0; }
  .table { grid-template-columns: 88px minmax(0, 1fr); }
  .fig img { height: 240px; }
  .footer-r { text-align: left; }
}

/* CTA 二维码 */
.cta-contact { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; }
.qr { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--muted); line-height: 1.5; }
.qr img { display: block; width: 96px; height: 96px; border: 1.5px solid var(--ink); background: var(--white); padding: 4px; }