/* =========================================================
   Build Duck 预售站 · 设计令牌
   主色 #F5501E（品牌橙）＋ 奶油黄（鸭壳色）＋ 墨色
   橙底按钮使用墨色文字（对比度 5.04:1，满足 WCAG AA）
   ========================================================= */
:root {
  --brand: #F5501E;
  --brand-600: #DE4512;
  --brand-text: #B93A10;     /* 橙色文字/链接，5.5:1 */
  --brand-50: #FFF1EA;
  --brand-100: #FFDFCF;
  --cream: #FFF6D6;
  --cream-200: #F7ECB8;
  --ink: #1C1917;
  --ink-2: #44403C;
  --muted: #6B645C;
  --line: #E9E1D0;
  --bg: #FFFBF3;
  --card: #FFFFFF;
  --ok: #15803D;
  --err: #B91C1C;

  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --shadow: 0 1px 2px rgba(28,25,23,.06), 0 8px 24px rgba(28,25,23,.06);
  --shadow-lg: 0 24px 64px rgba(28,25,23,.12);

  --font: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Consolas, monospace;

  --container: 1200px;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg);
  font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
a { color: var(--brand-text); text-underline-offset: 3px; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
button { font: inherit; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 100; background: var(--ink); color: #fff; padding: 8px 16px; border-radius: var(--r-sm); }
.skip-link:focus { top: 8px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.mono { font-family: var(--mono); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 24px; border-radius: 999px; border: 2px solid transparent;
  font-weight: 700; font-size: 16px; text-decoration: none; cursor: pointer;
  transition: transform .2s ease, background-color .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: scale(1.04); }
.btn:active { transform: scale(.96); }
.btn-primary { background: var(--brand); color: var(--ink); box-shadow: 0 6px 0 var(--ink); }
.btn-primary:hover { background: #FF6230; }
.btn-primary:active { box-shadow: 0 2px 0 var(--ink); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-sm { min-height: 40px; padding: 0 16px; font-size: 14px; }
.btn[disabled] { opacity: .6; cursor: not-allowed; transform: none; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  background: rgba(255,251,243,.88); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent; transition: border-color .2s ease;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand img { height: 26px; width: auto; }
.brand .divider { width: 1px; height: 20px; background: var(--line); }
.brand .product { font-weight: 800; font-size: 15px; letter-spacing: .02em; }
.nav { display: none; }
.nav-group { display: flex; align-items: center; gap: 4px; }
.nav-label { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: .08em; padding: 0 8px; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 15px; padding: 8px 12px; border-radius: 999px; transition: background-color .2s ease; }
.nav a:hover { background: var(--brand-50); color: var(--ink); }
.nav a[aria-current="page"] { background: var(--ink); color: #fff; }
.nav .sep { width: 1px; height: 20px; background: var(--line); margin: 0 8px; }
.header-cta { display: none; }
.menu-btn {
  display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px;
  border: 1.5px solid var(--ink); background: transparent; border-radius: 12px; cursor: pointer; color: var(--ink);
}
.menu-btn svg { width: 22px; height: 22px; }

.mobile-nav {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 49; background: var(--bg);
  padding: 24px 20px 120px; overflow-y: auto;
  opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.mobile-nav.open { opacity: 1; visibility: visible; transform: none; }
.mobile-nav h2 { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: .1em; margin: 16px 0 8px; font-weight: 600; }
.mobile-nav a { display: flex; justify-content: space-between; align-items: center; padding: 14px 4px; font-size: 18px; font-weight: 600; color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); }
.mobile-nav a::after { content: "→"; color: var(--muted); }
.mobile-nav .btn { width: 100%; margin-top: 24px; }
.mobile-nav .btn::after { content: none; }

/* ---------- 通用版块 ---------- */
.section { padding: 72px 0; position: relative; }
.section-head { margin-bottom: 40px; max-width: 720px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 13px; font-weight: 600;
  letter-spacing: .08em; color: var(--brand-text); text-transform: uppercase; margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 20px; height: 2px; background: var(--brand); }
.section-title { font-size: 30px; font-weight: 800; }
.section-desc { margin-top: 14px; color: var(--muted); font-size: 16px; }
.hl { background: linear-gradient(transparent 62%, var(--brand-100) 62%); padding: 0 2px; }
.grid-bg {
  background-image: radial-gradient(rgba(28,25,23,.09) 1px, transparent 1px);
  background-size: 22px 22px;
}
.tag {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
  font-size: 13px; font-weight: 600; background: var(--brand-50); color: var(--brand-text); border: 1px solid var(--brand-100);
}
.tag-dark { background: var(--ink); color: #fff; border-color: var(--ink); }
.notice {
  display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--r-md);
  background: var(--cream); border: 1.5px dashed #D9C77A; font-size: 14px; color: var(--ink-2);
}
.notice svg { flex: none; width: 20px; height: 20px; margin-top: 2px; color: var(--brand-text); }
.notice strong { color: var(--ink); }

/* ---------- 首屏 ---------- */
.hero { padding: 32px 0 56px; overflow: hidden; }
.hero-grid { display: grid; gap: 32px; align-items: center; }
.presale-pill {
  display: inline-flex; align-items: center; gap: 10px; padding: 6px 14px 6px 6px; border-radius: 999px;
  background: var(--ink); color: #fff; font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.presale-pill .dot { display: inline-flex; align-items: center; gap: 6px; background: var(--brand); color: var(--ink); padding: 3px 10px; border-radius: 999px; font-weight: 800; }
.presale-pill .dot::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ink); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .25; } }
.hero h1 { font-size: 40px; font-weight: 900; letter-spacing: -0.02em; }
.hero h1 .accent { color: var(--brand); -webkit-text-stroke: 0; position: relative; white-space: nowrap; }
.hero-sub { margin-top: 18px; font-size: 17px; color: var(--ink-2); max-width: 560px; }
.price-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 20px; margin-top: 24px; }
.price-row .big { font-family: var(--mono); font-size: 34px; font-weight: 800; letter-spacing: -0.02em; }
.price-row .big small { font-size: 18px; margin-right: 2px; }
.price-row .meta { font-size: 14px; color: var(--muted); }
.price-row .deposit { font-size: 15px; font-weight: 700; color: var(--brand-text); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px 12px; margin-top: 28px; }
.hero-actions .btn { flex: 1 1 200px; }
.hero-note { margin-top: 20px; font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }

.hero-visual { position: relative; }
.hero-photo {
  position: relative; border-radius: var(--r-xl); overflow: hidden; background: var(--cream);
  border: 2px solid var(--ink); box-shadow: 10px 10px 0 var(--brand);
  aspect-ratio: 4 / 4.4;
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 0%; }
.hero-photo figcaption {
  position: absolute; left: 12px; bottom: 12px; right: 12px; font-size: 12px; color: #fff;
  background: rgba(28,25,23,.72); padding: 6px 10px; border-radius: var(--r-sm); width: fit-content;
}
.chip {
  position: absolute; z-index: 2; background: #fff; border: 1.5px solid var(--ink); border-radius: 14px;
  padding: 8px 12px; box-shadow: 4px 4px 0 var(--ink); font-size: 12px; line-height: 1.35;
  animation: float 5s ease-in-out infinite;
}
.chip b { display: block; font-family: var(--mono); font-size: 15px; }
.chip-1 { top: 8%; left: -8px; }
.chip-2 { top: 40%; right: -8px; animation-delay: -1.6s; }
.chip-3 { bottom: 18%; left: -8px; animation-delay: -3.2s; background: var(--brand); }
@keyframes float { 50% { transform: translateY(-8px); } }
.sticker {
  position: absolute; top: -14px; right: 18px; z-index: 3; width: 92px; height: 92px; border-radius: 50%;
  background: var(--cream-200); border: 2px solid var(--ink); display: grid; place-items: center; text-align: center;
  font-weight: 900; font-size: 13px; line-height: 1.2; transform: rotate(12deg);
}
.sticker span { display: block; font-family: var(--mono); font-size: 20px; color: var(--brand-text); }

/* ---------- 数据条 ---------- */
.stats { border-block: 2px solid var(--ink); background: var(--ink); color: #fff; overflow: hidden; }
.stats-track { display: flex; width: max-content; animation: marquee 36s linear infinite; }
.stats:hover .stats-track { animation-play-state: paused; }
.stat { display: flex; align-items: baseline; gap: 10px; padding: 18px 32px; border-right: 1px solid rgba(255,255,255,.14); white-space: nowrap; }
.stat b { font-family: var(--mono); font-size: 22px; color: var(--brand); }
.stat span { font-size: 14px; color: #D6D3D1; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 亮点 Bento ---------- */
.bento { display: grid; gap: 16px; grid-template-columns: 1fr; }
.feat {
  position: relative; background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-lg);
  padding: 24px; overflow: hidden; display: flex; flex-direction: column; gap: 12px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feat:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--ink); }
.feat .idx { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: .08em; }
.feat h3 { font-size: 22px; font-weight: 800; }
.feat p { color: var(--muted); font-size: 15px; }
.feat .media { margin-top: auto; display: grid; place-items: center; min-height: 160px; }
.feat .media img { max-height: 200px; width: auto; object-fit: contain; filter: drop-shadow(0 16px 20px rgba(28,25,23,.18)); transition: transform .3s ease; }
.feat:hover .media img { transform: scale(1.05) rotate(-2deg); }
.feat-hero { background: var(--cream); border-color: var(--cream-200); }
.feat-hero .media img { max-height: 260px; }
.feat-dark { background: var(--ink); color: #fff; border-color: var(--ink); }
.feat-dark p { color: #D6D3D1; }
.feat-dark .idx { color: #A8A29E; }
.feat-orange { background: var(--brand); border-color: var(--brand); }
.feat-orange p, .feat-orange .idx { color: var(--ink); }
.spec-mini { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.spec-mini span { font-family: var(--mono); font-size: 12px; padding: 4px 10px; border-radius: 999px; border: 1px solid currentColor; opacity: .85; }

/* ---------- 动作视频 ---------- */
.moves { background: var(--cream); }
.move-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.move {
  position: relative; border-radius: var(--r-lg); overflow: hidden; background: var(--ink); aspect-ratio: 9 / 14;
  border: 2px solid var(--ink);
}
.move video { width: 100%; height: 100%; object-fit: cover; }
.move .label {
  position: absolute; left: 10px; top: 10px; background: #fff; border: 1.5px solid var(--ink); border-radius: 999px;
  padding: 2px 10px; font-weight: 800; font-size: 14px;
}
.move .num { position: absolute; right: 10px; bottom: 8px; font-family: var(--mono); color: #fff; font-size: 12px; opacity: .85; text-shadow: 0 1px 4px rgba(0,0,0,.6); }
.caption-note { margin-top: 20px; font-size: 13px; color: var(--muted); }

/* ---------- 组装故事 ---------- */
.build-grid { display: grid; gap: 32px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; counter-reset: step; }
.step {
  display: grid; grid-template-columns: 88px 1fr; gap: 16px; align-items: center; background: var(--card);
  border: 1.5px solid var(--line); border-radius: var(--r-md); padding: 10px; transition: border-color .2s ease, transform .2s ease;
}
.step:hover { border-color: var(--ink); transform: translateX(4px); }
.step img { width: 88px; height: 88px; border-radius: 12px; object-fit: cover; }
.step h3 { font-size: 17px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.step h3 .n { font-family: var(--mono); font-size: 12px; color: var(--brand-text); }
.step p { font-size: 14px; color: var(--muted); margin-top: 2px; }
.film {
  position: relative; border-radius: var(--r-xl); overflow: hidden; border: 2px solid var(--ink); background: var(--ink);
  aspect-ratio: 9 / 16; max-width: 420px; width: 100%; margin: 0 auto; box-shadow: -10px 10px 0 var(--cream-200);
}
.film video, .film img { width: 100%; height: 100%; object-fit: cover; }
.play-btn {
  position: absolute; inset: 0; display: grid; place-items: center; background: linear-gradient(180deg, transparent 40%, rgba(28,25,23,.7));
  border: 0; cursor: pointer; color: #fff;
}
.play-btn .circle {
  width: 84px; height: 84px; border-radius: 50%; background: var(--brand); color: var(--ink); display: grid; place-items: center;
  border: 2px solid var(--ink); box-shadow: 0 6px 0 var(--ink); transition: transform .2s ease;
}
.play-btn:hover .circle { transform: scale(1.06); }
.play-btn .circle svg { width: 32px; height: 32px; margin-left: 4px; }
.play-btn .txt { position: absolute; bottom: 20px; left: 20px; right: 20px; text-align: left; font-weight: 700; }
.play-btn .txt small { display: block; font-weight: 400; font-family: var(--mono); font-size: 12px; opacity: .85; }

/* ---------- 套件清单 ---------- */
.kit-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.part {
  background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-md); padding: 12px; display: flex; flex-direction: column; gap: 8px;
  transition: border-color .2s ease, transform .2s ease;
}
.part:hover { border-color: var(--ink); transform: translateY(-3px); }
.part .ph { aspect-ratio: 1; position: relative; background: #FAF7F0; border-radius: 12px; }
.part .ph img { position: absolute; inset: 12px; width: calc(100% - 24px); height: calc(100% - 24px); object-fit: contain; }
.part h3 { font-size: 15px; font-weight: 700; line-height: 1.4; }
.part .qty { font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--brand-text); }
.part p { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.kit-side { display: grid; gap: 16px; margin-top: 24px; }
.excl {
  border: 2px solid var(--ink); border-radius: var(--r-lg); padding: 20px; background: #fff; display: grid; gap: 16px;
}
.excl h3 { font-size: 18px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.excl ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.excl li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; }
.excl li .x { flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 800; margin-top: 2px; }
.excl .shell { display: grid; grid-template-columns: 96px 1fr; gap: 12px; align-items: center; background: #FAF7F0; border-radius: var(--r-md); padding: 10px; }
.excl .shell img { width: 96px; height: 96px; object-fit: contain; filter: grayscale(.4); opacity: .85; }
.excl .shell p { font-size: 13px; color: var(--muted); }
.screws { width: 100%; border-collapse: collapse; font-size: 14px; }
.screws th, .screws td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }
.screws th { font-size: 12px; color: var(--muted); font-weight: 600; }
.screws td.mono { white-space: nowrap; }

/* ---------- 参数表 ---------- */
.spec-wrap { display: grid; gap: 16px; }
.spec-card { background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.spec-card h3 { font-size: 15px; font-weight: 800; padding: 14px 20px; background: var(--ink); color: #fff; display: flex; justify-content: space-between; align-items: center; }
.spec-card h3 small { font-family: var(--mono); font-weight: 400; font-size: 12px; color: #A8A29E; }
.spec-card dl { margin: 0; }
.spec-card .row { display: grid; grid-template-columns: 96px 1fr; gap: 12px; padding: 12px 20px; border-top: 1px solid var(--line); font-size: 14px; }
.spec-card .row:first-child { border-top: 0; }
.spec-card dt { color: var(--muted); }
.spec-card dd { margin: 0; font-weight: 600; }
.dims { display: grid; grid-template-columns: repeat(3, 1fr); text-align: center; gap: 8px; padding: 16px 20px; }
.dims b { display: block; font-family: var(--mono); font-size: 26px; font-weight: 800; }
.dims span { font-size: 12px; color: var(--muted); }

/* ---------- 预售 ---------- */
.presale { background: var(--ink); color: #fff; overflow: hidden; }
.presale .eyebrow { color: var(--brand); }
.presale .section-desc { color: #D6D3D1; }
.presale-grid { display: grid; gap: 24px; }
.price-card { background: var(--brand); color: var(--ink); border-radius: var(--r-xl); padding: 28px 24px; position: relative; overflow: hidden; }
.price-card::after { content: "DUCK"; position: absolute; right: -6px; top: 4px; font-family: var(--mono); font-weight: 900; font-size: 88px; line-height: 1; opacity: .1; letter-spacing: -0.04em; pointer-events: none; }
.price-card .label { font-size: 14px; font-weight: 700; }
.price-card .total { font-family: var(--mono); font-size: 52px; font-weight: 900; letter-spacing: -0.03em; line-height: 1.1; margin-top: 4px; }
.price-card .total small { font-size: 24px; }
.price-card .tax { font-size: 13px; font-weight: 600; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
.split div { background: rgba(255,255,255,.35); border: 1.5px solid var(--ink); border-radius: var(--r-md); padding: 12px 14px; }
.split span { font-size: 13px; font-weight: 600; display: block; }
.split b { font-family: var(--mono); font-size: 24px; }
.flow { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 10px; position: relative; z-index: 1; }
.flow li { display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: start; font-size: 14px; font-weight: 600; }
.flow li .n { width: 32px; height: 32px; border-radius: 50%; background: var(--ink); color: var(--brand); display: grid; place-items: center; font-family: var(--mono); font-weight: 800; }
.flow li small { display: block; font-weight: 400; font-size: 13px; }
.rules { margin-top: 16px; background: #292524; border: 1px solid #44403C; border-radius: var(--r-lg); padding: 20px; font-size: 14px; color: #E7E5E4; }
.rules h3 { font-size: 15px; color: #fff; margin-bottom: 10px; }
.rules ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.rules strong { color: var(--brand); }

.order-card { background: var(--bg); color: var(--ink); border-radius: var(--r-xl); padding: 24px 20px; }
.order-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; padding: 6px; background: #F0E9DA; border-radius: 999px; margin-bottom: 20px; }
.order-tabs button { border: 0; background: transparent; border-radius: 999px; min-height: 44px; font-weight: 700; color: var(--ink-2); cursor: pointer; transition: background-color .2s ease; }
.order-tabs button[aria-selected="true"] { background: var(--ink); color: #fff; }
.pay-box { display: grid; gap: 16px; justify-items: center; text-align: center; }
.pay-box .qr { width: 220px; border-radius: var(--r-md); overflow: hidden; border: 2px solid var(--ink); background: #fff; }
.pay-box .amount { font-size: 15px; }
.pay-box .amount b { font-family: var(--mono); font-size: 28px; color: var(--brand-text); display: block; }
.pay-box ol { text-align: left; font-size: 14px; color: var(--ink-2); padding-left: 20px; margin: 0; display: grid; gap: 4px; }
.qty-ctrl { display: inline-flex; align-items: center; border: 1.5px solid var(--ink); border-radius: 999px; overflow: hidden; }
.qty-ctrl button { width: 44px; height: 44px; border: 0; background: transparent; font-size: 20px; font-weight: 800; cursor: pointer; }
.qty-ctrl button:hover { background: var(--brand-50); }
.qty-ctrl output { min-width: 44px; text-align: center; font-family: var(--mono); font-weight: 800; font-size: 18px; }

.form { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 14px; font-weight: 700; }
.field label .req { color: var(--err); margin-left: 2px; }
.field .hint { font-size: 12.5px; color: var(--muted); }
.field input, .field textarea, .field select {
  width: 100%; min-height: 48px; padding: 12px 14px; border-radius: 12px; border: 1.5px solid #CFC6B3; background: #fff;
  font: inherit; font-size: 16px; color: var(--ink); transition: border-color .2s ease, box-shadow .2s ease;
}
.field textarea { min-height: 88px; resize: vertical; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 4px var(--brand-100); }
.field[data-invalid="true"] input, .field[data-invalid="true"] textarea { border-color: var(--err); }
.field .err { font-size: 13px; color: var(--err); display: none; }
.field[data-invalid="true"] .err { display: block; }
.row-2 { display: grid; gap: 14px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--ink-2); }
.check input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--brand-600); flex: none; }
.form-msg { display: none; padding: 14px 16px; border-radius: var(--r-md); font-size: 14px; }
.form-msg.show { display: block; }
.form-msg.ok { background: #DCFCE7; color: #14532D; border: 1.5px solid #86EFAC; }
.form-msg.bad { background: #FEE2E2; color: #7F1D1D; border: 1.5px solid #FCA5A5; }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid currentColor; border-right-color: transparent; animation: spin .7s linear infinite; display: none; }
.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.success-view { display: none; text-align: center; padding: 24px 8px; }
.success-view.show { display: grid; gap: 12px; justify-items: center; }
.success-view .badge { width: 72px; height: 72px; border-radius: 50%; background: var(--brand); border: 2px solid var(--ink); display: grid; place-items: center; font-size: 32px; }
.success-view h3 { font-size: 22px; }
.success-view p { color: var(--muted); font-size: 15px; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 10px; }
.faq-item { background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-md); transition: border-color .2s ease; }
.faq-item[open] { border-color: var(--ink); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 18px 20px; font-weight: 700; font-size: 16px; display: flex; justify-content: space-between; gap: 16px; align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--brand-50); color: var(--brand-text); display: grid; place-items: center; font-family: var(--mono); font-size: 18px; transition: transform .2s ease; }
.faq-item[open] summary::after { transform: rotate(45deg); background: var(--brand); color: var(--ink); }
.faq-item .ans { padding: 0 20px 18px; color: var(--ink-2); font-size: 15px; }
.faq-item .ans p + p { margin-top: 8px; }

/* ---------- 支持入口带 ---------- */
.support-band { padding: 0 0 72px; }
.band {
  border: 2px solid var(--ink); border-radius: var(--r-xl); background: var(--cream); padding: 28px 24px; display: grid; gap: 20px; align-items: center;
  box-shadow: 8px 8px 0 var(--ink);
}
.band h2 { font-size: 24px; font-weight: 800; }
.band p { color: var(--ink-2); margin-top: 6px; }
.band-links { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--ink); color: #D6D3D1; padding: 56px 0 120px; font-size: 14px; }
.footer-grid { display: grid; gap: 32px; }
.site-footer img.logo { height: 32px; width: auto; }
.site-footer h3 { color: #fff; font-size: 14px; margin-bottom: 12px; font-family: var(--mono); letter-spacing: .08em; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer a { color: #E7E5E4; text-decoration: none; }
.site-footer a:hover { color: var(--brand); text-decoration: underline; }
.site-footer .copy { border-top: 1px solid #44403C; margin-top: 40px; padding-top: 20px; font-size: 12.5px; color: #A8A29E; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

/* ---------- 移动底部购买条 ---------- */
.buybar {
  position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--ink); color: #fff; border-radius: 999px; padding: 8px 8px 8px 20px; box-shadow: var(--shadow-lg);
  transform: translateY(140%); transition: transform .3s ease;
}
.buybar.show { transform: none; }
.buybar .p { font-size: 13px; line-height: 1.3; }
.buybar .p b { font-family: var(--mono); font-size: 18px; color: var(--brand); display: block; }
.buybar .btn { min-height: 44px; box-shadow: none; }

/* ---------- 视频弹窗 ---------- */
.modal { position: fixed; inset: 0; z-index: 90; display: none; place-items: center; background: rgba(12,10,9,.86); padding: 20px; }
.modal.open { display: grid; }
.modal-inner { position: relative; width: min(420px, 100%); max-height: calc(100vh - 40px); aspect-ratio: 9 / 16; }
.modal video { width: 100%; height: 100%; object-fit: contain; border-radius: var(--r-lg); background: #000; }
.modal-close { position: absolute; top: -8px; right: -8px; width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--ink); background: var(--brand); color: var(--ink); font-size: 22px; font-weight: 800; cursor: pointer; z-index: 2; }

/* ---------- 进场动效 ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* =========================================================
   技术支持页
   ========================================================= */
.sup-hero { padding: 40px 0 48px; }
.sup-hero h1 { font-size: 36px; font-weight: 900; }
.sup-hero p { margin-top: 12px; color: var(--ink-2); max-width: 620px; }
.quick { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 32px; }
.quick a {
  display: grid; gap: 6px; padding: 18px 16px; background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-md);
  text-decoration: none; color: var(--ink); transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.quick a:hover { border-color: var(--ink); transform: translateY(-3px); box-shadow: 4px 4px 0 var(--ink); }
.quick .ic { width: 40px; height: 40px; border-radius: 12px; background: var(--brand-50); color: var(--brand-text); display: grid; place-items: center; }
.quick .ic svg { width: 22px; height: 22px; }
.quick b { font-size: 16px; }
.quick span { font-size: 13px; color: var(--muted); }

.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.tl { display: grid; grid-template-columns: 44px 1fr; gap: 16px; position: relative; padding-bottom: 28px; }
.tl::before { content: ""; position: absolute; left: 21px; top: 44px; bottom: 0; width: 2px; background: repeating-linear-gradient(var(--line) 0 6px, transparent 6px 12px); }
.tl:last-child::before { display: none; }
.tl .n { width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--ink); background: var(--brand); display: grid; place-items: center; font-family: var(--mono); font-weight: 800; }
.tl.soon .n { background: #fff; }
.tl h3 { font-size: 18px; font-weight: 800; margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tl p, .tl li { color: var(--ink-2); font-size: 15px; }
.tl ul { margin: 8px 0 0; padding-left: 20px; display: grid; gap: 4px; }

.arch {
  background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-xl); padding: 20px; display: grid; gap: 14px;
}
.arch-core { background: var(--ink); color: #fff; border-radius: var(--r-lg); padding: 20px; text-align: center; }
.arch-core b { display: block; font-size: 20px; }
.arch-core span { font-family: var(--mono); font-size: 12.5px; color: #D6D3D1; }
.arch-nodes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.node { border: 1.5px solid var(--ink); border-radius: var(--r-md); padding: 12px; background: #FAF7F0; position: relative; }
.node::before { content: ""; position: absolute; top: -12px; left: 50%; width: 2px; height: 10px; background: var(--ink); }
.node b { display: block; font-size: 14px; }
.node span { font-size: 12.5px; color: var(--muted); }
.node.accent { background: var(--brand-50); border-color: var(--brand-text); }
.node .via { font-family: var(--mono); font-size: 11px; color: var(--brand-text); display: block; margin-bottom: 2px; }

.tbl-wrap { overflow-x: auto; border: 1.5px solid var(--line); border-radius: var(--r-lg); background: var(--card); }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
.tbl caption { text-align: left; padding: 14px 16px; font-weight: 800; font-size: 15px; background: #FAF7F0; border-bottom: 1px solid var(--line); }
.tbl th, .tbl td { padding: 10px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.tbl th { font-size: 12.5px; color: var(--muted); font-weight: 700; background: #FFFDF8; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td.mono { font-family: var(--mono); font-size: 13px; }
.pin-pwr { color: #B91C1C; font-weight: 700; }
.pin-gnd { color: var(--muted); }
.pin-bus { color: #1D4ED8; font-weight: 700; }
.iface-grid { display: grid; gap: 12px; }
.iface { background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-md); padding: 16px; display: grid; gap: 6px; }
.iface h3 { font-size: 16px; font-weight: 800; display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.iface h3 code { font-family: var(--mono); font-size: 12px; color: var(--brand-text); font-weight: 600; }
.iface p { font-size: 14px; color: var(--ink-2); }
.iface .pins { font-family: var(--mono); font-size: 12.5px; color: var(--muted); }

.dl-grid { display: grid; gap: 12px; }
.dl {
  display: grid; grid-template-columns: 52px 1fr auto; gap: 14px; align-items: center; padding: 16px; background: var(--card);
  border: 1.5px solid var(--line); border-radius: var(--r-md); text-decoration: none; color: var(--ink); transition: border-color .2s ease, transform .2s ease;
}
a.dl:hover { border-color: var(--ink); transform: translateY(-2px); }
.dl .ft { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; font-family: var(--mono); font-weight: 800; font-size: 12px; color: #fff; }
.ft-xls { background: #15803D; } .ft-doc { background: #1D4ED8; } .ft-soon { background: #A8A29E; }
.dl b { display: block; font-size: 15px; }
.dl span { font-size: 13px; color: var(--muted); }
.dl .go { font-size: 13px; font-weight: 700; color: var(--brand-text); white-space: nowrap; }
.dl.soon { border-style: dashed; background: #FFFDF8; }
.dl.soon .go { color: var(--muted); }

.safety { display: grid; gap: 12px; }
.safety li { list-style: none; }
.safety-list { margin: 0; padding: 0; display: grid; gap: 10px; }
.safety-item { display: grid; grid-template-columns: 36px 1fr; gap: 12px; background: var(--card); border: 1.5px solid var(--line); border-radius: var(--r-md); padding: 14px; font-size: 14.5px; color: var(--ink-2); }
.safety-item .i { width: 36px; height: 36px; border-radius: 10px; background: var(--cream); display: grid; place-items: center; font-weight: 900; color: var(--brand-text); }
.safety-item b { color: var(--ink); display: block; }

.contact-grid { display: grid; gap: 16px; }
.contact-card { background: var(--card); border: 2px solid var(--ink); border-radius: var(--r-xl); padding: 24px; display: grid; gap: 14px; }
.contact-card .line { display: grid; grid-template-columns: 72px 1fr; gap: 12px; font-size: 15px; }
.contact-card .line span { color: var(--muted); }
.contact-card .line a, .contact-card .line b { font-weight: 700; color: var(--ink); }
.office { border-radius: var(--r-xl); overflow: hidden; border: 2px solid var(--ink); aspect-ratio: 4 / 3; }
.office img { width: 100%; height: 100%; object-fit: cover; }

/* =========================================================
   断点：576 / 768 / 992 / 1200
   ========================================================= */
@media (min-width: 576px) {
  .hero h1 { font-size: 48px; }
  .move-grid { grid-template-columns: repeat(3, 1fr); }
  .kit-grid { grid-template-columns: repeat(3, 1fr); }
  .row-2 { grid-template-columns: 1fr 1fr; }
  .quick { grid-template-columns: repeat(3, 1fr); }
  .arch-nodes { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 768px) {
  .container { padding: 0 32px; }
  .section { padding: 96px 0; }
  .section-title { font-size: 38px; }
  .bento { grid-template-columns: repeat(6, 1fr); }
  .feat { grid-column: span 3; }
  .feat-hero { grid-column: span 6; display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 24px; padding: 32px; }
  .feat-hero .media { grid-row: 1 / span 4; grid-column: 2; }
  .feat-sm { grid-column: span 2; }
  .move-grid { grid-template-columns: repeat(5, 1fr); }
  .kit-grid { grid-template-columns: repeat(4, 1fr); }
  .spec-wrap { grid-template-columns: 1fr 1fr; }
  .band { grid-template-columns: 1fr auto; padding: 36px 40px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; }
  .dl-grid { grid-template-columns: 1fr 1fr; }
  .iface-grid { grid-template-columns: repeat(2, 1fr); }
  .safety-list { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; align-items: stretch; }
  .sup-hero h1 { font-size: 48px; }
}
@media (min-width: 992px) {
  :root { --header-h: 72px; }
  .nav { display: flex; align-items: center; gap: 4px; }
  .header-cta { display: inline-flex; }
  .menu-btn { display: none; }
  .hero { padding: 56px 0 88px; }
  .hero-grid { grid-template-columns: 1.05fr 1fr; gap: 56px; }
  .hero h1 { font-size: 64px; }
  .hero-actions .btn { flex: 0 0 auto; }
  .chip-1 { left: -36px; } .chip-2 { right: -28px; } .chip-3 { left: -24px; }
  .feat-sm { grid-column: span 2; }
  .build-grid { grid-template-columns: 1.1fr .9fr; align-items: center; gap: 56px; }
  .kit-layout { display: grid; grid-template-columns: 1fr 340px; gap: 24px; align-items: start; }
  .kit-side { margin-top: 0; position: sticky; top: calc(var(--header-h) + 16px); }
  .spec-wrap { grid-template-columns: repeat(3, 1fr); }
  .presale-grid { grid-template-columns: .9fr 1.1fr; gap: 32px; align-items: start; }
  .order-card { padding: 32px; }
  .buybar { display: none; }
  .faq-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
  .faq-layout .section-head { position: sticky; top: calc(var(--header-h) + 24px); }
  .quick { grid-template-columns: repeat(6, 1fr); }
  .arch { grid-template-columns: 1fr; padding: 32px; }
  .arch-nodes { grid-template-columns: repeat(4, 1fr); }
  .iface-grid { grid-template-columns: repeat(3, 1fr); }
  .site-footer { padding-bottom: 56px; }
  .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
}
@media (min-width: 1200px) {
  .hero h1 { font-size: 72px; }
  .kit-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* 修正：价格卡水印置于内容之下；移动端「不含」提示前置 */
.price-card > * { position: relative; z-index: 1; }
@media (max-width: 991.98px) {
  .kit-layout { display: flex; flex-direction: column; }
  .kit-side { order: -1; margin: 0 0 24px; }
}

/* 出厂已装好 / 技术对接微信 */
.excl-ok { border-color: var(--ok); }
.excl li .x.ok { background: var(--ok); }
.wechat-card { justify-items: center; text-align: center; }
.wechat-qr { width: 100%; max-width: 240px; border-radius: 16px; border: 1.5px solid var(--line); }
.contact-card { align-content: start; }
.contact-card > .btn { justify-self: start; }
.wechat-card > .btn { justify-self: center; }
img { height: auto; }
.office-photo { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: 50% 45%; border-radius: var(--r-md); margin-top: 8px; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

[hidden] { display: none !important; }
.reg-box { display: grid; gap: 14px; }
.reg-box h3 { font-size: 20px; font-weight: 800; }
.reg-box > p { color: var(--ink-2); font-size: 15px; }
.reg-fields { margin: 0; padding: 14px 16px 14px 34px; background: #fff; border: 1.5px solid var(--line); border-radius: var(--r-md); display: grid; gap: 4px; font-size: 14px; color: var(--ink-2); }
.reg-note { font-size: 12.5px; color: var(--muted); }