/* ALPHABELLE TUB — 静态原型共享样式
   视觉体系：碳黑 + 纯白，Inter 800 标题 + 0.05em 字距，全幅深色 Hero。
   内容全部来自客户资料表；图片为本地生成的石材纹理占位图，客户素材到位后替换。 */

/* ============ 1. 设计令牌 ============ */
:root {
  --c-carbon: #0c0c0e;
  --c-carbon-2: #141418;
  --c-carbon-3: #1c1c21;
  --c-ink: #1a1a1d;
  --c-white: #ffffff;
  --c-paper: #fafaf9;
  --c-gray: #f1f0ee;
  --c-line: #e6e4e1;
  --c-line-dark: #2a2b30;
  --c-muted: #6e7076;
  --c-muted-dark: #a0a2a7;

  --f-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --fs-body: 15px;
  --lh-body: 24px;
  --fs-h1: 52px;
  --fs-h2: 36px;
  --fs-h3: 22px;
  --fs-h4: 16px;
  --fs-small: 13px;
  --fs-micro: 11px;
  --ls: 0.05em;

  --container: 1200px;
  --pad: 24px;
  --sec-y: 88px;
  --radius: 2px;
  --radius-lg: 6px;

  --header-h: 68px;
  --topbar-h: 36px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.35s;
  --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.28);
}

/* ============ 2. 基础 ============ */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--f-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--c-ink);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, textarea, select { font: inherit; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, h5, p { margin: 0; }

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: var(--ls);
  line-height: 1.2;
  text-transform: none;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); line-height: 26px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--pad); }
.section { padding: var(--sec-y) 0; }
.section--tight { padding: 60px 0; }
.section--paper { background: var(--c-paper); }
.section--gray { background: var(--c-gray); }
.section--dark { background: var(--c-carbon); color: var(--c-white); }

.eyebrow {
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 14px;
}
.section--dark .eyebrow { color: var(--c-muted-dark); }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.section-head p { margin-top: 16px; color: var(--c-muted); }
.section--dark .section-head p { color: var(--c-muted-dark); }

.lede { font-size: 17px; line-height: 30px; }
.muted { color: var(--c-muted); }
.center { text-align: center; }
.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;
}

/* ============ 3. 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 13px 28px;
  font-size: var(--fs-small); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  border-radius: var(--radius); border: 1px solid transparent;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--solid { background: var(--c-white); color: var(--c-carbon); }
.btn--solid:hover { background: var(--c-gray); }
.btn--ghost { border-color: rgba(255, 255, 255, 0.4); color: var(--c-white); }
.btn--ghost:hover { border-color: var(--c-white); background: rgba(255, 255, 255, 0.08); }
.btn--dark { background: var(--c-carbon); color: var(--c-white); }
.btn--dark:hover { background: var(--c-carbon-3); }
.btn--outline { border-color: var(--c-line); color: var(--c-ink); }
.btn--outline:hover { border-color: var(--c-ink); }
.btn--sm { min-height: 38px; padding: 9px 18px; font-size: var(--fs-micro); }
.btn--block { width: 100%; }

.link-arrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--fs-small); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  border-bottom: 1px solid currentColor; padding-bottom: 4px;
  transition: opacity var(--dur) var(--ease), gap var(--dur) var(--ease);
}
.link-arrow:hover { opacity: 0.65; gap: 12px; }

/* ============ 4. 占位图（石材纹理） ============ */
.ph {
  position: relative; overflow: hidden;
  background: var(--c-gray);
  border-radius: var(--radius-lg);
}
.ph > img, .ph > svg { width: 100%; height: 100%; object-fit: cover; }
.ph--tall { aspect-ratio: 3 / 4; }
.ph--square { aspect-ratio: 1 / 1; }
.ph--wide { aspect-ratio: 16 / 9; }
.ph--pano { aspect-ratio: 21 / 9; }

.ph__tag {
  position: absolute; left: 12px; bottom: 12px; z-index: 2;
  padding: 5px 10px; border-radius: 999px;
  background: rgba(12, 12, 14, 0.62); color: #fff;
  font-size: 10px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  backdrop-filter: blur(6px);
}
.ph__badge {
  position: absolute; right: 14px; top: 14px; z-index: 2;
  width: 74px; height: 74px; border-radius: 50%;
  display: grid; place-items: center; text-align: center;
  background: var(--c-white); color: var(--c-carbon);
  font-size: 9px; font-weight: 800; letter-spacing: 0.1em; line-height: 1.3;
  text-transform: uppercase; box-shadow: var(--shadow);
}

/* ============ 5. 顶栏 + 主导航 ============ */
.topbar {
  height: var(--topbar-h);
  display: flex; align-items: center;
  background: var(--c-carbon-2); color: var(--c-muted-dark);
  font-size: var(--fs-micro); letter-spacing: 0.08em;
  border-bottom: 1px solid var(--c-line-dark);
}
.topbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.topbar__left, .topbar__right { display: flex; align-items: center; gap: 20px; }
.topbar a { transition: color var(--dur) var(--ease); }
.topbar a:hover { color: var(--c-white); }
.topbar__dot { width: 6px; height: 6px; border-radius: 50%; background: #3fae6a; display: inline-block; }

.site-header {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(12, 12, 14, 0.92);
  color: var(--c-white);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background var(--dur) var(--ease), height var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.site-header.is-stuck { background: rgba(12, 12, 14, 0.98); height: 58px; border-bottom-color: rgba(255,255,255,0.14); }
.site-header .container { display: flex; align-items: center; gap: 28px; }

.brand { display: flex; align-items: center; gap: 12px; margin-right: auto; }
.brand__mark {
  width: 34px; height: 34px; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  background: var(--c-white); color: var(--c-carbon);
  font-size: 15px; font-weight: 800; letter-spacing: -0.02em;
}
.brand__name { font-size: 17px; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; line-height: 1; }
.brand__sub { display: block; font-size: 9px; font-weight: 600; letter-spacing: 0.28em; color: var(--c-muted-dark); margin-top: 4px; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav > li > a {
  display: block; padding: 10px 14px; border-radius: var(--radius);
  font-size: var(--fs-small); font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav > li > a:hover { color: #fff; background: rgba(255, 255, 255, 0.07); }
.nav > li.is-active > a { color: #fff; }
.nav > li.is-active > a::after {
  content: ""; display: block; height: 2px; width: 18px; margin: 6px auto -6px;
  background: var(--c-white);
}

.header-actions { display: flex; align-items: center; gap: 12px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.4); }
.icon-btn svg { width: 17px; height: 17px; }

.lang { position: relative; }
.lang__btn {
  display: flex; align-items: center; gap: 6px;
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: 0.14em;
  padding: 8px 10px; border: 1px solid rgba(255, 255, 255, 0.18); border-radius: var(--radius);
}
.lang__btn:hover { background: rgba(255, 255, 255, 0.1); }
.lang__menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 168px;
  background: var(--c-white); color: var(--c-ink); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); padding: 6px; display: none; z-index: 70;
}
.lang.is-open .lang__menu { display: block; }
.lang__menu a {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 9px 12px; font-size: var(--fs-small); border-radius: var(--radius);
}
.lang__menu a:hover { background: var(--c-gray); }
.lang__menu a.is-current { font-weight: 800; }

.nav-toggle { display: none; }

/* 搜索条 */
.search-strip { background: var(--c-white); border-bottom: 1px solid var(--c-line); }
.search-strip form { display: flex; align-items: center; gap: 12px; padding: 12px 0; }
.search-strip input {
  flex: 1; min-width: 0; border: 1px solid var(--c-line); border-radius: 999px;
  padding: 12px 20px; font-size: var(--fs-small); background: var(--c-paper);
}
.search-strip input:focus { outline: 2px solid var(--c-carbon); outline-offset: 1px; background: #fff; }

/* 移动端抽屉 */
.drawer {
  position: fixed; inset: 0; z-index: 80; display: none;
}
.drawer.is-open { display: block; }
.drawer__scrim { position: absolute; inset: 0; background: rgba(12, 12, 14, 0.6); }
.drawer__panel {
  position: absolute; right: 0; top: 0; bottom: 0; width: min(320px, 86vw);
  background: var(--c-carbon); color: var(--c-white);
  padding: 22px; overflow-y: auto;
  transform: translateX(100%); animation: slide-in var(--dur) var(--ease) forwards;
}
@keyframes slide-in { to { transform: translateX(0); } }
.drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.drawer a { display: block; padding: 14px 0; border-bottom: 1px solid var(--c-line-dark); font-size: var(--fs-body); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 700; }
.drawer .btn { margin-top: 22px; }

/* ============ 6. Hero ============ */
.hero {
  position: relative; display: grid; place-items: center;
  min-height: min(78vh, 720px);
  padding: 96px 0;
  background: var(--c-carbon); color: var(--c-white);
  overflow: hidden; text-align: center;
}
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.hero__bg img, .hero__bg svg { width: 100%; height: 100%; object-fit: cover; opacity: 0.5; }
.hero__scrim {
  position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(12, 12, 14, 0.15), rgba(12, 12, 14, 0.86) 70%),
    linear-gradient(180deg, rgba(12, 12, 14, 0.55), rgba(12, 12, 14, 0.9));
}
.hero__inner { position: relative; z-index: 2; max-width: 880px; padding: 0 var(--pad); }
.hero h1 { font-size: clamp(30px, 6.4vw, var(--fs-h1)); letter-spacing: 0.04em; }
.hero h1 em { display: block; font-style: normal; }
.hero__sub { margin: 22px auto 0; max-width: 620px; color: rgba(255, 255, 255, 0.78); font-size: 16px; line-height: 28px; }
.hero__cta { margin-top: 36px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero__meta {
  margin-top: 44px; display: flex; justify-content: center; gap: 14px 34px; flex-wrap: wrap;
  font-size: var(--fs-micro); letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255, 255, 255, 0.6);
}
.hero__meta span { display: flex; align-items: center; gap: 10px; }
.hero__meta span::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: rgba(255, 255, 255, 0.5); }
.hero__scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); z-index: 2;
  font-size: 10px; letter-spacing: 0.24em; text-transform: uppercase; color: rgba(255, 255, 255, 0.55);
}
.hero__scroll::after {
  content: ""; display: block; width: 1px; height: 40px; margin: 10px auto 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.7), transparent);
}

/* 内页 Hero（紧凑） */
.page-hero {
  position: relative; background: var(--c-carbon); color: var(--c-white);
  padding: 84px 0 72px; overflow: hidden;
}
.page-hero__bg { position: absolute; inset: 0; opacity: 0.34; }
.page-hero__bg img, .page-hero__bg svg { width: 100%; height: 100%; object-fit: cover; }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(28px, 5vw, 44px); }
.page-hero p { margin-top: 16px; max-width: 640px; color: rgba(255, 255, 255, 0.76); }
.crumbs { font-size: var(--fs-micro); letter-spacing: 0.14em; text-transform: uppercase; color: rgba(255,255,255,0.55); margin-bottom: 18px; }
.crumbs a:hover { color: #fff; }
.crumbs span { margin: 0 8px; }

/* ============ 7. 分类入口（双列描进行） ============ */
.cat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.cat-row {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 22px; background: var(--c-white);
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.cat-row:hover { border-color: var(--c-carbon); transform: translateY(-2px); box-shadow: var(--shadow); }
.cat-row__icon { width: 30px; height: 30px; flex: none; color: var(--c-carbon); }
.cat-row__body { margin-right: auto; }
.cat-row__name { display: block; font-size: var(--fs-h4); font-weight: 800; letter-spacing: 0.06em; }
.cat-row__note { display: block; font-size: var(--fs-small); color: var(--c-muted); margin-top: 2px; }
.cat-row__arrow { width: 16px; height: 16px; flex: none; color: var(--c-muted); transition: transform var(--dur) var(--ease); }
.cat-row:hover .cat-row__arrow { transform: translateX(4px); color: var(--c-carbon); }

/* ============ 8. 全幅宣言图 ============ */
.banner { position: relative; background: var(--c-carbon); color: var(--c-white); overflow: hidden; }
.banner__media { position: relative; aspect-ratio: 21 / 9; min-height: 380px; }
.banner__media img, .banner__media svg { width: 100%; height: 100%; object-fit: cover; }
.banner__overlay {
  position: absolute; inset: 0; display: flex; align-items: flex-end;
  padding: clamp(28px, 6vw, 72px);
  background:
    linear-gradient(0deg, rgba(12, 12, 14, 0.82) 0%, rgba(12, 12, 14, 0.34) 42%, rgba(12, 12, 14, 0) 72%),
    linear-gradient(90deg, rgba(12, 12, 14, 0.42) 0%, rgba(12, 12, 14, 0) 58%);
}
.banner__content { max-width: 560px; }
.banner__content h2 { font-size: clamp(24px, 3.6vw, var(--fs-h3)); text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45); }
.banner__content p { margin-top: 18px; color: rgba(255, 255, 255, 0.9); font-size: 16px; line-height: 28px; text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5); }
.banner__link { margin-top: 26px; }

/* ============ 9. 分类切换药丸 + 产品轨道 ============ */
.pills { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-bottom: 40px; }
.pill {
  padding: 11px 22px; border: 1px solid var(--c-line); border-radius: 999px; background: var(--c-white);
  font-size: var(--fs-small); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  transition: all var(--dur) var(--ease);
}
.pill:hover { border-color: var(--c-carbon); }
.pill.is-active { background: var(--c-carbon); border-color: var(--c-carbon); color: var(--c-white); }

.track-wrap { position: relative; }
.track {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(272px, 1fr);
  gap: 22px; overflow-x: auto; scroll-snap-type: x mandatory;
  padding-bottom: 26px; scrollbar-width: none;
}
.track::-webkit-scrollbar { display: none; }
.track > * { scroll-snap-align: start; }
.track__bar { height: 2px; background: var(--c-line); position: relative; }
.track__bar span { position: absolute; left: 0; top: 0; bottom: 0; width: 26%; background: var(--c-carbon); transition: transform 0.1s linear; }
.track__nav { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }
.track__nav .icon-btn { border-color: var(--c-line); color: var(--c-ink); background: var(--c-white); }
.track__nav .icon-btn:hover { background: var(--c-carbon); color: #fff; border-color: var(--c-carbon); }

.pcard { display: flex; flex-direction: column; background: var(--c-white); border: 1px solid var(--c-line); border-radius: var(--radius-lg); overflow: hidden; transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease); }
.pcard:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.pcard__media { position: relative; aspect-ratio: 1 / 1; background: var(--c-gray); }
.pcard__media img, .pcard__media svg { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.pcard:hover .pcard__media img, .pcard:hover .pcard__media svg { transform: scale(1.04); }
.pcard__flags { position: absolute; left: 12px; top: 12px; display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.flag { padding: 5px 10px; border-radius: 999px; font-size: 10px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.flag--dark { background: var(--c-carbon); color: #fff; }
.flag--light { background: #fff; color: var(--c-carbon); border: 1px solid var(--c-line); }
.pcard__body { padding: 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.pcard__cat { font-size: var(--fs-micro); letter-spacing: 0.16em; text-transform: uppercase; color: var(--c-muted); }
.pcard__name { font-size: var(--fs-h4); font-weight: 800; letter-spacing: 0.04em; line-height: 22px; }
.pcard__spec { font-size: var(--fs-small); color: var(--c-muted); }
.pcard__foot { margin-top: auto; padding-top: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.swatches { display: flex; gap: 6px; }
.swatch { width: 16px; height: 16px; border-radius: 50%; border: 1px solid var(--c-line); }

/* 产品网格（列表页） */
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }

/* ============ 10. 双图卡 ============ */
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.duo__card { position: relative; border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 4 / 3; background: var(--c-carbon); }
.duo__card img, .duo__card svg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.85; transition: transform 0.7s var(--ease), opacity var(--dur) var(--ease); }
.duo__card:hover img, .duo__card:hover svg { transform: scale(1.05); opacity: 1; }
.duo__label {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 26px;
  background: linear-gradient(0deg, rgba(12, 12, 14, 0.9), transparent);
  color: #fff;
}
.duo__label h3 { font-size: var(--fs-h3); }
.duo__label p { margin-top: 8px; font-size: var(--fs-small); color: rgba(255, 255, 255, 0.75); }
.duo__rule { width: 44px; height: 3px; background: #fff; margin-top: 14px; }

/* ============ 11. 优势 / 特性 ============ */
.features { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 40px 28px; }
.feature { text-align: center; padding: 0 8px; }
.feature__icon {
  width: 58px; height: 58px; margin: 0 auto 20px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid var(--c-line); background: var(--c-white); color: var(--c-carbon);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.feature:hover .feature__icon { background: var(--c-carbon); color: #fff; border-color: var(--c-carbon); }
.feature__icon svg { width: 24px; height: 24px; }
.feature h3 { font-size: var(--fs-h4); }
.feature p { margin-top: 10px; font-size: var(--fs-small); color: var(--c-muted); line-height: 22px; }

/* 图文两栏 */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 6vw, 72px); align-items: center; }
.split__body h2 { font-size: clamp(26px, 3.4vw, var(--fs-h2)); }
.split__body p + p { margin-top: 16px; }
.split__list { margin-top: 26px; display: grid; gap: 14px; }
.split__list li { display: flex; gap: 12px; align-items: flex-start; font-size: var(--fs-small); }
.split__list svg { width: 18px; height: 18px; flex: none; margin-top: 2px; color: var(--c-carbon); }
.check-list li { display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; border-bottom: 1px solid var(--c-line); }
.check-list li:last-child { border-bottom: 0; }
.check-list svg { width: 18px; height: 18px; flex: none; margin-top: 3px; }

/* 数据条 */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; text-align: center; }
.stat__num { font-size: clamp(30px, 4.4vw, 46px); font-weight: 800; letter-spacing: 0.02em; line-height: 1.1; }
.stat__label { margin-top: 10px; font-size: var(--fs-micro); letter-spacing: 0.18em; text-transform: uppercase; color: var(--c-muted); }
.section--dark .stat__label { color: var(--c-muted-dark); }

/* 认证条 */
.certs { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.cert {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 24px; border: 1px solid var(--c-line-dark); border-radius: var(--radius-lg);
  background: var(--c-carbon-2);
}
.cert__mark { width: 36px; height: 36px; border-radius: 50%; flex: none; display: grid; place-items: center; background: rgba(255,255,255,0.08); color: #fff; }
.cert__mark svg { width: 17px; height: 17px; }
.cert__body { display: block; }
.cert__name { display: block; font-size: var(--fs-small); font-weight: 800; letter-spacing: 0.1em; }
.cert__note { display: block; font-size: var(--fs-micro); color: var(--c-muted-dark); margin-top: 2px; }

/* 时间线 */
.timeline { position: relative; margin-left: 12px; padding-left: 30px; border-left: 1px solid var(--c-line); }
.timeline__item { position: relative; padding-bottom: 34px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ""; position: absolute; left: -39px; top: 4px; width: 15px; height: 15px; border-radius: 50%;
  background: var(--c-white); border: 2px solid var(--c-carbon);
}
.timeline__year { font-size: var(--fs-h4); font-weight: 800; letter-spacing: 0.1em; }
.timeline__item p { margin-top: 8px; font-size: var(--fs-small); color: var(--c-muted); }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--c-line); }
.faq__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 22px 0; text-align: left; font-size: var(--fs-h4); font-weight: 800; letter-spacing: 0.03em;
}
.faq__q i { position: relative; width: 14px; height: 14px; flex: none; }
.faq__q i::before, .faq__q i::after { content: ""; position: absolute; background: currentColor; }
.faq__q i::before { left: 0; right: 0; top: 6px; height: 2px; }
.faq__q i::after { top: 0; bottom: 0; left: 6px; width: 2px; transition: transform var(--dur) var(--ease); }
.faq__item.is-open i::after { transform: scaleY(0); }
.faq__a { display: none; padding: 0 0 22px; color: var(--c-muted); font-size: var(--fs-small); line-height: 24px; }
.faq__item.is-open .faq__a { display: block; }

/* 规格表 */
.spec-table { width: 100%; border-collapse: collapse; font-size: var(--fs-small); }
.spec-table th, .spec-table td { padding: 14px 16px; border-bottom: 1px solid var(--c-line); text-align: left; vertical-align: top; }
.spec-table th { width: 38%; font-weight: 800; letter-spacing: 0.06em; background: var(--c-paper); }
.spec-table td { color: var(--c-muted); }

/* 标签页 */
.tabs__nav { display: flex; gap: 6px; border-bottom: 1px solid var(--c-line); overflow-x: auto; scrollbar-width: none; }
.tabs__nav::-webkit-scrollbar { display: none; }
.tabs__btn {
  padding: 14px 20px; white-space: nowrap; font-size: var(--fs-small); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--c-muted); border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs__btn.is-active { color: var(--c-carbon); border-bottom-color: var(--c-carbon); }
.tabs__panel { display: none; padding-top: 30px; }
.tabs__panel.is-active { display: block; }

/* 表单 */
.field { margin-bottom: 18px; }
.field label { display: block; font-size: var(--fs-micro); font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 16px; border: 1px solid var(--c-line); border-radius: var(--radius);
  background: var(--c-white); font-size: var(--fs-small);
}
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--c-carbon); outline-offset: 1px; }
.field textarea { min-height: 130px; resize: vertical; }
.field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.form-note { font-size: var(--fs-micro); color: var(--c-muted); margin-top: 14px; line-height: 20px; }

.contact-card { border: 1px solid var(--c-line); border-radius: var(--radius-lg); padding: 26px; background: var(--c-white); }
.contact-card h3 { font-size: var(--fs-h4); }
.contact-card__row { display: flex; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--c-line); font-size: var(--fs-small); }
.contact-card__row:last-child { border-bottom: 0; padding-bottom: 0; }
.contact-card__row svg { width: 18px; height: 18px; flex: none; margin-top: 2px; }
.contact-card__row b { display: block; font-size: var(--fs-micro); letter-spacing: 0.14em; text-transform: uppercase; color: var(--c-muted); margin-bottom: 3px; }

/* CTA 带 */
.cta-band { position: relative; background: var(--c-carbon); color: #fff; overflow: hidden; }
.cta-band__bg { position: absolute; inset: 0; opacity: 0.3; }
.cta-band__bg img, .cta-band__bg svg { width: 100%; height: 100%; object-fit: cover; }
.cta-band .container { position: relative; z-index: 1; display: flex; align-items: center; gap: 40px; flex-wrap: wrap; justify-content: space-between; padding-top: 68px; padding-bottom: 68px; }
.cta-band h2 { font-size: clamp(24px, 3.2vw, 34px); max-width: 620px; }
.cta-band p { margin-top: 14px; color: rgba(255, 255, 255, 0.76); max-width: 560px; }
.cta-band__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* 提示条（原型专用：标注资料缺口） */
.todo {
  display: block;
  padding: 14px 18px; border-radius: var(--radius);
  background: #fff8e6; border: 1px dashed #d9b64a; color: #6b5310;
  font-size: var(--fs-small); line-height: 22px; letter-spacing: 0.02em;
}
.todo strong { color: #4d3a05; }

/* ============ 12. 页脚 ============ */
.site-footer { background: var(--c-carbon); color: var(--c-white); }
.footer-news { padding: 56px 0; border-bottom: 1px solid var(--c-line-dark); }
.footer-news .container { display: flex; align-items: center; gap: 40px; flex-wrap: wrap; justify-content: space-between; }
.footer-news h3 { font-size: var(--fs-h3); }
.footer-news p { margin-top: 10px; font-size: var(--fs-small); color: var(--c-muted-dark); }
.footer-news form { display: flex; gap: 10px; flex: 1; min-width: 280px; max-width: 460px; }
.footer-news input { flex: 1; min-width: 0; padding: 13px 18px; border-radius: var(--radius); border: 1px solid var(--c-line-dark); background: var(--c-carbon-2); color: #fff; font-size: var(--fs-small); }
.footer-news input::placeholder { color: var(--c-muted-dark); }
.footer-news input:focus { outline: 2px solid rgba(255, 255, 255, 0.5); }

.footer-main { padding: 60px 0 30px; display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 40px; }
.footer-brand p { margin-top: 18px; font-size: var(--fs-small); color: var(--c-muted-dark); line-height: 24px; max-width: 340px; }
.footer-col h4 { font-size: var(--fs-micro); letter-spacing: 0.2em; text-transform: uppercase; color: #fff; margin-bottom: 18px; }
.footer-col a, .footer-col li { display: block; padding: 7px 0; font-size: var(--fs-small); color: var(--c-muted-dark); transition: color var(--dur) var(--ease); }
.footer-col a:hover { color: #fff; }
.footer-social { display: flex; gap: 10px; margin-top: 24px; }
.footer-social a { width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--c-line-dark); display: grid; place-items: center; transition: all var(--dur) var(--ease); }
.footer-social a:hover { background: #fff; color: var(--c-carbon); }
.footer-social svg { width: 16px; height: 16px; }
.footer-bottom { border-top: 1px solid var(--c-line-dark); padding: 22px 0 96px; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: var(--fs-micro); color: var(--c-muted-dark); letter-spacing: 0.06em; }

/* 移动端页脚手风琴 */
.footer-acc { display: none; }
.footer-acc__item { border-bottom: 1px solid var(--c-line-dark); }
.footer-acc__btn { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 18px 0; font-size: var(--fs-micro); font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; }
.footer-acc__body { display: none; padding-bottom: 16px; }
.footer-acc__item.is-open .footer-acc__body { display: block; }
.footer-acc__item.is-open .footer-acc__btn i { transform: rotate(45deg); }
.footer-acc__btn i { position: relative; width: 12px; height: 12px; transition: transform var(--dur) var(--ease); }
.footer-acc__btn i::before, .footer-acc__btn i::after { content: ""; position: absolute; background: currentColor; }
.footer-acc__btn i::before { left: 0; right: 0; top: 5px; height: 2px; }
.footer-acc__btn i::after { top: 0; bottom: 0; left: 5px; width: 2px; }
.footer-acc__body a { display: block; padding: 6px 0; font-size: var(--fs-small); color: var(--c-muted-dark); }

/* ============ 13. 浮窗 ============ */
.wa-float {
  position: fixed; right: 20px; bottom: 20px; z-index: 65;
  display: flex; align-items: center; gap: 10px;
  padding: 12px 18px; border-radius: 999px;
  background: #1f9d55; color: #fff;
  font-size: var(--fs-small); font-weight: 700; letter-spacing: 0.06em;
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.45);
  transition: transform var(--dur) var(--ease);
}
.wa-float:hover { transform: translateY(-2px); }
.wa-float svg { width: 20px; height: 20px; }

.back-top {
  position: fixed; right: 24px; bottom: 78px; z-index: 64;
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--c-carbon); color: #fff; border: 1px solid var(--c-line-dark);
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: all var(--dur) var(--ease);
}
.back-top.is-on { opacity: 1; pointer-events: auto; transform: none; }
.back-top svg { width: 16px; height: 16px; }

/* ============ 14. 动画 ============ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}
/* 整页截图 / 打印 / ?noanim */
html.no-anim .reveal { opacity: 1; transform: none; transition: none; }
@media print {
  .reveal { opacity: 1 !important; transform: none !important; }
  .site-header, .topbar, .wa-float, .back-top, .loading-bar { display: none !important; }
}

/* 加载进度条 */
.loading-bar { position: fixed; left: 0; top: 0; height: 2px; width: 0; background: var(--c-carbon); z-index: 99; transition: width 0.2s linear; }

@keyframes fade-up { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

/* ============ 15. 响应式 ============ */
@media (max-width: 1080px) {
  .features, .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav > li > a { padding: 10px 10px; }
}

@media (max-width: 900px) {
  :root { --sec-y: 64px; }
  .nav, .header-actions .btn, .topbar__left { display: none; }
  .nav-toggle { display: grid; }
  .split, .duo, .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .grid-3 .pcard__media, .grid-2 .pcard__media { aspect-ratio: 16 / 10; }
  .split__media--first { order: -1; }
  .footer-main { display: none; }
  .footer-acc { display: block; padding: 20px 0; }
  .hero { min-height: 68vh; padding: 72px 0; }
  .banner__media { aspect-ratio: 4 / 3; }
  .banner__overlay { background: linear-gradient(180deg, rgba(12,12,14,0.25), rgba(12,12,14,0.92)); }
}

@media (max-width: 640px) {
  :root { --pad: 18px; --fs-body: 14px; }
  .cat-grid { grid-template-columns: minmax(0, 1fr); }
  .features, .stats, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .track { grid-auto-columns: minmax(240px, 78vw); }
  .track__nav { display: none; }
  .hero__meta { gap: 10px 20px; }
  .footer-news form { max-width: none; }
  .cta-band .container { padding: 48px 0; }
  .wa-float span { display: none; }
  .wa-float { padding: 14px; }
}