/* ==========================================================================
   bastion —— SENTINEL 站点主题样式表
   --------------------------------------------------------------------------
   设计规格：BMW 企业站设计语言（framework 见设计规格库 bmw/DESIGN.md）
     · 基单位 8px，区块纵向留白 96px，容器 1280px
     · 圆角全部为 0（唯一例外：圆形图标按钮）
     · 不用投影，层次只靠色块对比与 1px 发丝线
     · 排版两档字重：标题 700、正文 400；小标签全大写 + 字距
     · 字体：BMW Type Next 需授权，已替换为 Inter（规格书指定的开源替代）
       —— 阿语用 Noto Sans Arabic，等宽数字用系统等宽栈
   品牌色沿用 SENTINEL：深蓝 #0A3D6E、强调红 #D2372A（红只做极少量点缀）
   全部尺寸用逻辑属性（padding-inline / inset-inline），阿语 RTL 自动镜像
   ========================================================================== */

/* ------------------------------------------------------------------ 字体 */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("../fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("../fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF,
    U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("../fonts/inter-cyrillic.woff2") format("woff2");
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "Noto Sans Arabic";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("../fonts/noto-sans-arabic.woff2") format("woff2");
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897,
    U+08A0-08E1, U+08E3-08FF, U+200C-200E, U+2010-2011, U+204F, U+2E41,
    U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC;
}

/* ------------------------------------------------------------------ token */

:root {
  /* 品牌 */
  --brand: #0a3d6e;
  --brand-600: #14538f;
  --brand-300: #4e86bc;
  --brand-50: #f1f5f9;
  --accent: #d2372a;
  --wa: #0e7a47;

  /* 文字 */
  --ink: #14171c;
  --body: #4a5159;
  --muted: #79818c;
  --on-dark: #ffffff;
  --on-dark-2: #a9b2bd;

  /* 面 */
  --canvas: #ffffff;
  --surface: #f6f7f9;
  --surface-card: #fafbfc;
  --dark: #0b131b;
  --dark-2: #121c26;

  /* 线 */
  --line: #e4e7ec;
  --line-strong: #c9cfd7;

  /* 形状 */
  --radius: 0;
  --radius-icon: 50%;

  /* 尺 */
  --wrap: 1280px;
  --pad: 40px;
  --sec-y: 96px;
  --nav-h: 68px;

  /* 字体 */
  --f-head: "Inter", "Helvetica Neue", Arial, "Noto Sans Arabic", system-ui, sans-serif;
  --f-body: "Inter", "Helvetica Neue", Arial, "Noto Sans Arabic", system-ui, sans-serif;
  --f-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

/* ------------------------------------------------------------------ 基础 */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0 0 1.1em; padding-inline-start: 1.2em; }
figure { margin: 0; }
button { font: inherit; color: inherit; }

h1, h2, h3, h4, h5 {
  font-family: var(--f-head);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(34px, 4.4vw, 64px); line-height: 1.04; letter-spacing: -0.025em; }
h2 { font-size: clamp(26px, 2.8vw, 40px); line-height: 1.1; letter-spacing: -0.02em; }
h3 { font-size: clamp(18px, 1.5vw, 22px); line-height: 1.25; }
h4 { font-size: 17px; line-height: 1.3; }
h5 { font-size: 15px; line-height: 1.35; }

::selection { background: var(--brand); color: #fff; }

:focus-visible {
  outline: 2px solid var(--brand-600);
  outline-offset: 3px;
}

.skip {
  position: absolute; inset-inline-start: -9999px; top: 0;
  background: var(--brand); color: #fff; padding: 12px 20px; z-index: 200;
}
.skip:focus { inset-inline-start: 0; }

/* ------------------------------------------------------------------ 布局 */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.wrap--narrow { max-width: 880px; }

.sec { padding-block: var(--sec-y); }
.sec--soft { background: var(--surface); }
.sec--dark { background: var(--dark); color: var(--on-dark-2); }
.sec--line { border-top: 1px solid var(--line); }
.sec--flush { padding-block: 0; }

.sec-head { display: flex; flex-direction: column; gap: 16px; margin-bottom: 48px; max-width: 760px; }
.sec-head--row {
  flex-direction: row; align-items: flex-end; justify-content: space-between;
  gap: 32px; max-width: none;
}
.sec-head h2 { max-width: 22ch; }
.sec-head .lead { max-width: 58ch; }

/* 眉标：红色短竖线 + 全大写字距 */
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-head);
  font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--brand); margin: 0;
}
.kicker::before {
  content: ""; inline-size: 18px; block-size: 2px; background: var(--accent); flex: none;
}
.sec--dark .kicker { color: var(--on-dark); }
.kicker--plain::before { display: none; }

.lead { font-size: clamp(16px, 1.35vw, 19px); line-height: 1.6; color: var(--body); }
.sec--dark .lead { color: var(--on-dark-2); }

.mono {
  font-family: var(--f-mono);
  font-size: 12.5px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--muted);
}

/* ------------------------------------------------------------------ 按钮 */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 0 28px;
  border: 1px solid transparent; border-radius: var(--radius);
  font-family: var(--f-head); font-size: 14px; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase;
  cursor: pointer; transition: background-color .18s ease, color .18s ease, border-color .18s ease;
  text-align: center;
}
.btn--primary { background: var(--brand); color: #fff; }
.btn--primary:hover { background: var(--brand-600); }
.btn--outline { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--outline:hover { border-color: var(--ink); color: var(--ink); }
.btn--onDark { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .45); }
.btn--onDark:hover { background: #fff; color: var(--ink); border-color: #fff; }
.btn--ghost { background: transparent; color: var(--brand); padding: 0; min-height: 0; }
.btn--ghost:hover { color: var(--ink); }
.btn--sm { min-height: 40px; padding: 0 18px; font-size: 12.5px; }

/* 文字箭头链接：大写 + 字距 + 尾部箭头 */
.link-arrow {
  display: inline-flex; align-items: center; gap: 8px; width: fit-content;
  font-family: var(--f-head); font-size: 12.5px; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase; color: var(--ink);
  border-bottom: 1px solid var(--line-strong); padding-block: 6px;
  transition: border-color .18s ease, color .18s ease;
}
.link-arrow::after { content: "→"; font-size: 14px; letter-spacing: 0; }
.link-arrow:hover { color: var(--brand); border-color: var(--brand); }
[dir="rtl"] .link-arrow::after { content: "←"; }

/* ------------------------------------------------------------------ 页眉 */

.site-header {
  position: sticky; top: 0; z-index: 90;
  background: var(--canvas);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex; align-items: center; gap: 40px;
  block-size: var(--nav-h);
  max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad);
}
.brand { display: inline-flex; align-items: center; gap: 12px; flex: none; }
.brand__mark { inline-size: 34px; block-size: 34px; flex: none; }
.brand__text { display: flex; flex-direction: column; gap: 1px; }
.brand__name {
  font-family: var(--f-head); font-size: 17px; font-weight: 700;
  letter-spacing: .16em; color: var(--ink); line-height: 1.1;
}
.brand__desc {
  font-family: var(--f-mono); font-size: 9.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted);
}

.nav { margin-inline-end: auto; }
.nav__list { display: flex; align-items: center; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav__item { position: relative; }
.nav__link {
  display: inline-block; padding-block: 8px;
  font-family: var(--f-head); font-size: 14px; font-weight: 500; color: var(--ink);
  border-bottom: 2px solid transparent;
}
.nav__link:hover { border-color: var(--line-strong); }
.nav__link[aria-current="page"] { border-color: var(--brand); }

.header-tools { display: flex; align-items: center; gap: 16px; flex: none; }

.lang { position: relative; }
.lang__btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: 1px solid var(--line-strong); border-radius: 0;
  padding: 8px 12px; cursor: pointer;
  font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink);
}
.lang__btn:hover { border-color: var(--ink); }
.lang__menu {
  position: absolute; inset-inline-end: 0; top: calc(100% + 8px); min-inline-size: 168px;
  background: #fff; border: 1px solid var(--line); padding: 6px; margin: 0; list-style: none;
  display: none; z-index: 95;
}
.lang[data-open] .lang__menu { display: block; }
.lang__menu a {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 9px 12px; font-size: 14px; color: var(--body);
}
.lang__menu a:hover { background: var(--surface); color: var(--ink); }
.lang__menu a[aria-current="true"] { color: var(--brand); font-weight: 600; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line-strong);
  inline-size: 42px; block-size: 42px; cursor: pointer;
  align-items: center; justify-content: center;
}
.nav-toggle svg { inline-size: 18px; block-size: 18px; stroke: var(--ink); }

/* 移动抽屉 */
.drawer {
  position: fixed; inset: 0; z-index: 120; display: none;
  background: rgba(11, 19, 27, .5);
}
.drawer[data-open] { display: block; }
.drawer__panel {
  position: absolute; inset-block: 0; inset-inline-end: 0;
  inline-size: min(88vw, 380px); background: #fff;
  display: flex; flex-direction: column; overflow-y: auto;
}
.drawer__head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; border-bottom: 1px solid var(--line);
}
.drawer__close { background: none; border: 0; cursor: pointer; padding: 8px; }
.drawer__close svg { inline-size: 20px; block-size: 20px; stroke: var(--ink); }
.drawer__nav { padding: 12px 0; }
.drawer__nav a {
  display: block; padding: 14px 22px; font-family: var(--f-head);
  font-size: 16px; font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--line);
}
.drawer__foot { margin-top: auto; padding: 20px 22px; display: grid; gap: 10px; }

/* ------------------------------------------------------------------ 主视觉 */

.hero {
  position: relative;
  display: flex; align-items: flex-end;
  min-block-size: clamp(520px, 68vh, 760px);
  background: var(--dark); color: #fff; overflow: hidden;
}
.hero__media { position: absolute; inset: 0; }
.hero__media img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.hero__media::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(to top, rgba(8, 14, 20, .92) 0%, rgba(8, 14, 20, .55) 42%, rgba(8, 14, 20, .12) 100%),
    linear-gradient(to right, rgba(8, 14, 20, .7) 0%, rgba(8, 14, 20, 0) 62%);
}
[dir="rtl"] .hero__media::after {
  background:
    linear-gradient(to top, rgba(8, 14, 20, .92) 0%, rgba(8, 14, 20, .55) 42%, rgba(8, 14, 20, .12) 100%),
    linear-gradient(to left, rgba(8, 14, 20, .7) 0%, rgba(8, 14, 20, 0) 62%);
}
.hero__body {
  position: relative; z-index: 2;
  width: 100%; max-width: var(--wrap); margin-inline: auto;
  padding: clamp(112px, 15vh, 168px) var(--pad) clamp(56px, 7vw, 96px);
}
.hero__body > * { max-width: 44ch; }
.hero h1 { color: #fff; margin-block: 20px 0; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--f-mono); font-size: 12px; letter-spacing: .18em;
  text-transform: uppercase; color: rgba(255, 255, 255, .82);
}
.hero__eyebrow::before { content: ""; inline-size: 24px; block-size: 2px; background: var(--accent); flex: none; }
.hero__lead { margin-block: 22px 0; font-size: clamp(16px, 1.4vw, 19px); line-height: 1.6; color: rgba(255, 255, 255, .84); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero__certs {
  display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 30px 0 0;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: rgba(255, 255, 255, .62);
}
.hero__certs span { display: inline-flex; align-items: center; gap: 18px; }
.hero__certs span + span::before { content: "/"; color: rgba(255, 255, 255, .3); }

/* 页头带（内页）：浅底 + 面包屑 + H1 + 导语，右侧可选数字 */
.page-head { background: var(--surface); border-bottom: 1px solid var(--line); padding-block: clamp(44px, 6vw, 76px); }
.page-head__inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; }
.page-head__main { max-width: 62ch; }
.page-head h1 { margin-block: 18px 0; }
.page-head__lead { margin-top: 20px; }
.page-head__aside { flex: none; text-align: end; }
.page-head__figure {
  font-family: var(--f-head); font-size: clamp(44px, 6vw, 88px);
  font-weight: 700; line-height: 1; letter-spacing: -.03em; color: var(--brand);
}
.page-head__figureLabel {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted); margin-top: 10px;
}

.crumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); margin: 0; padding: 0; list-style: none;
}
.crumb li { display: inline-flex; align-items: center; gap: 8px; }
.crumb li + li::before { content: "/"; color: var(--line-strong); }
.crumb a:hover { color: var(--brand); }

/* ------------------------------------------------------------------ 网格与卡片 */

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--gap-lg { gap: 32px; }

/* 产品/专题卡：图 → 名 → 摘要 → 底部动作，无圆角无阴影 */
.card {
  display: flex; flex-direction: column;
  background: var(--canvas);
  border: 1px solid var(--line);
  transition: border-color .18s ease;
}
.card:hover { border-color: var(--line-strong); }
.card__media {
  display: block; aspect-ratio: 16 / 11; overflow: hidden; background: var(--surface-card);
  border-bottom: 1px solid var(--line);
}
.card__media img { inline-size: 100%; block-size: 100%; object-fit: contain; }
.card__media--cover img { object-fit: cover; }
.card__body { display: flex; flex-direction: column; gap: 10px; padding: 22px; flex: 1 1 auto; }
.card__title { font-size: 17px; font-weight: 700; line-height: 1.3; color: var(--ink); margin: 0; }
.card__title a:hover { color: var(--brand); }
.card__desc { font-size: 14px; line-height: 1.55; color: var(--body); margin: 0; }
.card__foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line);
}
.card__code {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted);
}
.card__go { font-size: 13px; color: var(--brand); }

/* 大卡：左图右文 */
.feature-card {
  display: grid; grid-template-columns: 1.15fr 1fr;
  border: 1px solid var(--line); background: var(--canvas);
}
.feature-card__media { aspect-ratio: 16 / 10; overflow: hidden; background: var(--surface-card); }
.feature-card__media img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.feature-card__body { display: flex; flex-direction: column; justify-content: center; gap: 14px; padding: clamp(24px, 3.4vw, 52px); }
.feature-card__body h2, .feature-card__body h3 { font-size: clamp(22px, 2.2vw, 32px); }
.feature-card__meta { display: flex; flex-wrap: wrap; gap: 16px; font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

/* 图文小卡（能力 / 应用） */
.tile {
  display: flex; flex-direction: column; gap: 12px;
  padding: 26px; border: 1px solid var(--line); background: var(--canvas);
}
.tile__icon { inline-size: 26px; block-size: 26px; color: var(--brand); }
.tile__icon svg { inline-size: 100%; block-size: 100%; }
.tile h3 { font-size: 17px; }
.tile p { font-size: 14px; line-height: 1.55; margin: 0; }
.tile--dark { background: var(--dark-2); border-color: rgba(255, 255, 255, .12); color: var(--on-dark-2); }
.tile--dark h3 { color: var(--on-dark); }
.tile--dark .tile__icon { color: var(--on-dark); }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tags li {
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--body); border: 1px solid var(--line); padding: 5px 9px;
}

/* 数据带 */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.stats__item { padding: 28px 0; border-bottom: 1px solid var(--line); }
.stats__item:not(:nth-child(3n + 1)) { padding-inline-start: 28px; border-inline-start: 1px solid var(--line); }
.stats--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stats--4 .stats__item { padding-inline-start: 0; border-inline-start: 0; }
.stats--4 .stats__item:not(:nth-child(4n + 1)) { padding-inline-start: 28px; border-inline-start: 1px solid var(--line); }
.stats__value { font-family: var(--f-head); font-size: clamp(28px, 3vw, 40px); font-weight: 700; line-height: 1; color: var(--ink); letter-spacing: -.02em; }
.stats__label { margin-top: 10px; font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.sec--dark .stats { border-color: rgba(255, 255, 255, .16); }
.sec--dark .stats__item { border-color: rgba(255, 255, 255, .16); }
.sec--dark .stats__value { color: #fff; }
.sec--dark .stats__label { color: var(--on-dark-2); }

/* ------------------------------------------------------------------ 规格表 */

.spec { border-top: 1px solid var(--line); }
.spec__row {
  display: grid; grid-template-columns: minmax(0, 36%) minmax(0, 1fr); gap: 20px; align-items: baseline;
  padding-block: 15px; border-bottom: 1px solid var(--line);
}
.spec__key {
  font-family: var(--f-head); font-size: 14px; font-weight: 500; color: var(--body);
}
/* 值左对齐：规格里有「High-strength composite fabric with nano metallic coating」
   这种长值，右对齐会在窄列里折成两行、还把断行推到右边，看着像排版坏了。 */
.spec__val {
  font-family: var(--f-mono); font-size: 13.5px; font-weight: 600; color: var(--ink);
  text-align: start; letter-spacing: .01em; line-height: 1.5; overflow-wrap: anywhere;
}
.spec--two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 48px; }
.spec--two .spec__row { grid-column: auto; grid-template-columns: minmax(0, 42%) minmax(0, 1fr); }

/* 技术面板（首页） */
.panels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.panel { border: 1px solid var(--line); background: var(--canvas); }
.panel__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 26px; border-bottom: 1px solid var(--line); }
.panel__tag { font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--brand); }
.panel__title { font-size: 17px; font-weight: 700; color: var(--ink); }
.panel__body { padding: 8px 26px 20px; }

/* ------------------------------------------------------------------ 表格（正文） */

.table-scroll { overflow-x: auto; margin-block: 1.6em; border: 1px solid var(--line); }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 12px 16px; text-align: start; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { background: var(--surface); font-family: var(--f-head); font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ink); }
.table tr:last-child td { border-bottom: 0; }
.swipe-hint { display: none; font-family: var(--f-mono); font-size: 11px; color: var(--muted); }

/* ------------------------------------------------------------------ 正文 */

.article { max-width: 760px; }
.article h2 { margin-block: 2em 0.7em; font-size: clamp(22px, 2vw, 30px); scroll-margin-top: calc(var(--nav-h) + 24px); }
.article h3 { margin-block: 1.8em 0.6em; scroll-margin-top: calc(var(--nav-h) + 24px); }
.article h4, .article h5 { margin-block: 1.6em 0.5em; }
.article p, .article ul, .article ol { font-size: 16.5px; line-height: 1.72; color: var(--body); }
.article > p:first-child { font-size: 18.5px; color: var(--ink); }
.article ul li, .article ol li { margin-block: 0.4em; }
.article a { color: var(--brand); border-bottom: 1px solid var(--brand-300); }
.article a:hover { border-color: var(--brand); }
.article blockquote, .pullquote {
  margin: 2em 0; padding: 4px 0 4px 24px; border-inline-start: 3px solid var(--accent);
  font-family: var(--f-head); font-size: 20px; line-height: 1.45; font-weight: 500; color: var(--ink);
}
.article figure { margin-block: 2em; }
.article figure img { border: 1px solid var(--line); }
.article figcaption { margin-top: 10px; font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.article hr { margin-block: 2.4em; border: 0; border-top: 1px solid var(--line); }

/* 正文两栏（正文 + 目录） */
.with-aside { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: 64px; align-items: start; }
.aside-card { position: sticky; top: calc(var(--nav-h) + 24px); border: 1px solid var(--line); padding: 22px; background: var(--surface-card); }
.aside-card__title { font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px; }
.toc { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.toc a { font-size: 14px; color: var(--body); line-height: 1.4; display: block; }
.toc a:hover { color: var(--brand); }
.aside-cta { display: grid; gap: 12px; margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.aside-cta p { font-size: 13.5px; margin: 0; }

/* 章节带（产品 / 关于 / 首页的结构化章节） */
.chapters { display: grid; gap: 72px; }
.chapter__head { display: grid; gap: 12px; max-width: 62ch; margin-bottom: 26px; }
.chapter__label { font-family: var(--f-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.chapter__title { font-size: clamp(22px, 2.2vw, 32px); }
.sec--dark .chapter__title { color: #fff; }

/* 说明块 */
.note {
  border: 1px solid var(--line); border-inline-start: 3px solid var(--brand);
  background: var(--brand-50); padding: 20px 22px; font-size: 14.5px; line-height: 1.6;
}

/* ------------------------------------------------------------------ 筛选 */

.filters {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  padding-block: 20px; border-bottom: 1px solid var(--line); margin-bottom: 36px;
}
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px; border: 1px solid var(--line-strong); background: #fff;
  font-family: var(--f-head); font-size: 12px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; color: var(--body); cursor: pointer;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip[aria-pressed="true"], .chip--on { background: var(--ink); border-color: var(--ink); color: #fff; }
.chip__count { font-family: var(--f-mono); font-size: 11px; color: inherit; opacity: .6; }
.filters__spacer { margin-inline-start: auto; }

/* ------------------------------------------------------------------ 分页 */

.pager { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 48px; }
.pager a, .pager span {
  display: inline-flex; align-items: center; justify-content: center;
  min-inline-size: 40px; block-size: 40px; padding-inline: 10px;
  border: 1px solid var(--line); font-family: var(--f-mono); font-size: 12.5px; color: var(--body);
}
.pager a:hover { border-color: var(--ink); color: var(--ink); }
.pager [aria-current="page"] { background: var(--ink); border-color: var(--ink); color: #fff; }

/* ------------------------------------------------------------------ 媒体（视频） */

.video-card { border: 1px solid var(--line); background: var(--canvas); display: flex; flex-direction: column; }
.video-card__media { position: relative; aspect-ratio: 16 / 9; background: var(--dark); overflow: hidden; }
.video-card--v .video-card__media { aspect-ratio: 9 / 16; }
.video-card__media img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.video-card__play {
  position: absolute; inset-block-end: 14px; inset-inline-start: 14px;
  inline-size: 44px; block-size: 44px; border-radius: var(--radius-icon);
  background: rgba(255, 255, 255, .92); display: inline-flex; align-items: center; justify-content: center;
}
.video-card__play svg { inline-size: 16px; block-size: 16px; fill: var(--ink); }
.video-card__body { padding: 18px 20px 20px; display: grid; gap: 8px; }
.video-card__title { font-size: 15.5px; font-weight: 700; color: var(--ink); line-height: 1.35; }
.video-card__meta { font-family: var(--f-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

.player { border: 1px solid var(--line); background: var(--dark); }
.player video { inline-size: 100%; block-size: auto; display: block; }
.player__placeholder { display: grid; place-items: center; gap: 14px; padding: 64px 24px; text-align: center; color: var(--on-dark-2); }
.player__placeholder p { font-size: 14px; margin: 0; max-width: 44ch; }

/* ------------------------------------------------------------------ 表单 */

.form { display: grid; gap: 18px; }
.form__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.field { display: grid; gap: 8px; }
.field label { font-family: var(--f-head); font-size: 13px; font-weight: 600; color: var(--ink); }
.field input, .field select, .field textarea {
  inline-size: 100%; padding: 13px 15px; min-block-size: 50px;
  border: 1px solid var(--line-strong); border-radius: 0; background: #fff;
  font-family: var(--f-body); font-size: 15px; color: var(--ink);
}
.field textarea { min-block-size: 132px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand);
}
.field input:invalid:not(:placeholder-shown) { border-color: var(--accent); }
.field__hint { font-size: 12.5px; color: var(--muted); }
.form__foot { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 6px; }
.form__foot p { font-size: 12.5px; color: var(--muted); margin: 0; max-width: 44ch; }
.form__status { font-size: 14px; color: var(--wa); }
.form__status[data-error] { color: var(--accent); }

/* ------------------------------------------------------------------ CTA 带 */

.cta-band { position: relative; background: var(--dark); color: #fff; overflow: hidden; }
.cta-band__media { position: absolute; inset: 0; }
.cta-band__media img { inline-size: 100%; block-size: 100%; object-fit: cover; opacity: .28; }
.cta-band__inner {
  position: relative; z-index: 2; padding-block: clamp(64px, 8vw, 104px);
  display: grid; gap: 20px; max-width: 720px;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: var(--on-dark-2); font-size: 17px; margin: 0; }
.cta-band__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; }

/* ------------------------------------------------------------------ 页脚 */

.site-footer { background: var(--surface); border-top: 1px solid var(--line); padding-block: 64px 28px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer__brand { display: grid; gap: 14px; max-width: 34ch; }
.footer__about { font-size: 14px; line-height: 1.6; color: var(--body); margin: 0; }
.footer__col h3 {
  font-family: var(--f-mono); font-size: 11px; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 14px;
}
.footer__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer__col a { font-size: 14px; color: var(--body); }
.footer__col a:hover { color: var(--brand); }
.footer__bottom {
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between;
  margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line);
  font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .06em; color: var(--muted);
}
.footer__contact { display: grid; gap: 10px; }
.footer__contact a { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink); }
.footer__contact svg { inline-size: 16px; block-size: 16px; stroke: var(--brand); fill: none; stroke-width: 1.7; }

/* ------------------------------------------------------------------ 悬浮件 */

.contact-fab {
  position: fixed; inset-block-end: 24px; inset-inline-end: 24px; z-index: 80;
  display: flex; flex-direction: column; align-items: flex-end; gap: 10px;
}
.contact-fab__btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--wa); color: #fff; border: 0; cursor: pointer;
  padding: 13px 20px; border-radius: 0;
  font-family: var(--f-head); font-size: 12.5px; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
}
.contact-fab__btn svg { inline-size: 18px; block-size: 18px; fill: currentColor; }
.contact-fab__panel {
  display: none; background: #fff; border: 1px solid var(--line); padding: 18px;
  min-inline-size: 260px; box-shadow: none;
}
.contact-fab[data-open] .contact-fab__panel { display: grid; gap: 12px; }
.contact-fab__panel a { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink); }
.contact-fab__panel svg { inline-size: 16px; block-size: 16px; stroke: var(--brand); fill: none; stroke-width: 1.7; }
.contact-fab__kind { font-family: var(--f-mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

.to-top {
  position: fixed; inset-block-end: 24px; inset-inline-start: 24px; z-index: 80;
  inline-size: 42px; block-size: 42px; border-radius: var(--radius-icon);
  border: 1px solid var(--line-strong); background: #fff; cursor: pointer;
  display: none; place-items: center;
}
.to-top[data-show] { display: grid; }
.to-top svg { inline-size: 17px; block-size: 17px; stroke: var(--ink); fill: none; stroke-width: 2; }

.lightbox {
  position: fixed; inset: 0; z-index: 200; background: rgba(8, 14, 20, .94);
  display: none; place-items: center; padding: 32px;
}
.lightbox[data-open] { display: grid; }
.lightbox img { max-inline-size: min(1200px, 92vw); max-block-size: 86vh; object-fit: contain; }
.lightbox__close { position: absolute; inset-block-start: 20px; inset-inline-end: 24px; background: none; border: 0; cursor: pointer; }
.lightbox__close svg { inline-size: 26px; block-size: 26px; stroke: #fff; }

/* ------------------------------------------------------------------ 杂项 */

.empty { padding: 64px 0; text-align: center; color: var(--muted); font-size: 15px; }
.hr-line { border: 0; border-top: 1px solid var(--line); margin: 0; }
.visually-hidden {
  position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.pad-y-sm { padding-block: 40px; }

/* 滚动出现动画：默认可见，JS 加上 .js 之后才隐藏，避免无脚本时白屏 */
.js [data-reveal] { opacity: 0; transform: translateY(14px); }
.js [data-reveal].is-in { opacity: 1; transform: none; transition: opacity .5s ease, transform .5s ease; }

/* ------------------------------------------------------------------ 下拉菜单 */

.nav__item > .nav__link::after {
  content: ""; display: inline-block; inline-size: 5px; block-size: 5px;
  border-inline-end: 1.5px solid currentColor; border-block-end: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px); margin-inline-start: 7px; opacity: .5;
}
.nav__item:not(:has(.nav__menu)) > .nav__link::after { display: none; }

.nav__menu {
  position: absolute; inset-inline-start: -18px; top: calc(100% + 10px);
  min-inline-size: 236px; background: #fff; border: 1px solid var(--line);
  list-style: none; margin: 0; padding: 8px 0; z-index: 92;
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: opacity .14s ease, transform .14s ease, visibility .14s;
}
.nav__item:hover > .nav__menu,
.nav__item:focus-within > .nav__menu { opacity: 1; visibility: visible; transform: none; }
.nav__menu a {
  display: block; padding: 10px 20px; font-size: 14px; color: var(--body);
}
.nav__menu a:hover { background: var(--surface); color: var(--ink); }
.nav__menu a[aria-current="page"] { color: var(--brand); font-weight: 600; }

.drawer__sub { padding-inline-start: 38px !important; font-size: 14px !important; color: var(--body) !important; font-weight: 400 !important; }
.drawer__langs { display: flex; flex-wrap: wrap; gap: 8px; }
.drawer__langs a {
  border: 1px solid var(--line-strong); padding: 8px 12px;
  font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase;
}

/* ------------------------------------------------------------------ 信任条 */

.trustbar { border-bottom: 1px solid var(--line); background: var(--canvas); }
.trustbar__inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 18px 40px; padding-block: 22px;
}
.trustbar__lead {
  margin: 0; font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--muted);
}
.trustbar__marks { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.trustbar__marks span {
  font-family: var(--f-head); font-size: 13px; font-weight: 600;
  letter-spacing: .04em; color: var(--ink); opacity: .72;
}

/* ------------------------------------------------------------------ 产品详情 */

.product-top { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: start; }
.product-gallery { display: grid; gap: 12px; }
.gallery__main { background: var(--surface-card); border: 1px solid var(--line); aspect-ratio: 4 / 3; }
.gallery__main img { inline-size: 100%; block-size: 100%; object-fit: contain; }
.gallery__thumbs { display: flex; flex-wrap: wrap; gap: 10px; }
.gallery__thumbs button {
  inline-size: 84px; block-size: 64px; padding: 0; background: var(--surface-card);
  border: 1px solid var(--line); cursor: pointer; overflow: hidden;
}
.gallery__thumbs button[aria-current="true"] { border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); }
.gallery__thumbs img { inline-size: 100%; block-size: 100%; object-fit: contain; }
.product-info { display: grid; gap: 24px; align-content: start; }
.product-info__actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero__certs--ink { color: var(--muted); }
.hero__certs--ink span + span::before { color: var(--line-strong); }

/* ------------------------------------------------------------------ 两栏与章节 */

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.split--media-right .split__fig { order: 2; }
.split__fig img { inline-size: 100%; border: 1px solid var(--line); }
.split__fig figcaption { margin-top: 10px; font-family: var(--f-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

.editorial { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 56px; align-items: start; }
.editorial__label { display: grid; gap: 10px; }
.editorial__body { display: grid; gap: 18px; }

.boxed { border: 1px solid var(--line); background: var(--canvas); padding: clamp(24px, 3vw, 44px); display: grid; gap: 18px; }

.figure-wide { margin: 0 0 40px; }
.figure-wide img { inline-size: 100%; border: 1px solid var(--line); }

.media-rows { display: grid; gap: 56px; }
.media-row { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.media-row--left .media-row__fig { order: -1; }
.media-row__fig img { inline-size: 100%; border: 1px solid var(--line); }
.media-row__text h2 { margin-bottom: 14px; }

.cap-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: stretch; }
.cap-grid__fig { position: relative; margin: 0; border: 1px solid rgba(255, 255, 255, .14); overflow: hidden; }
.cap-grid__fig img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.cap-grid__fig figcaption {
  position: absolute; inset-block-end: 0; inset-inline: 0;
  padding: 22px; background: linear-gradient(to top, rgba(8, 14, 20, .92), rgba(8, 14, 20, 0));
}
.cap-grid__fig h3 { color: #fff; font-size: 18px; }
.cap-grid__fig p { color: var(--on-dark-2); font-size: 14px; margin: 6px 0 0; }
.cap-grid__side { display: grid; gap: 16px; align-content: start; }
.cap-grid__tiles { margin-top: 32px; }

/* ------------------------------------------------------------------ 关于页 */

.promise { border-inline-start: 2px solid var(--accent); padding-inline-start: 20px; }
.promise__value { font-family: var(--f-head); font-size: clamp(26px, 3vw, 38px); font-weight: 700; color: #fff; line-height: 1; margin: 0; }
.promise__label { margin-top: 10px; font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--on-dark-2); }

.timeline { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.timeline__item { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 32px; padding-block: 26px; border-bottom: 1px solid var(--line); }
.timeline__year { font-family: var(--f-mono); font-size: 15px; font-weight: 600; color: var(--brand); letter-spacing: .04em; }
.timeline__body h3 { font-size: 17px; margin-bottom: 6px; }
.timeline__body p { font-size: 14.5px; margin: 0; }

.checklist { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.checklist li { position: relative; padding-inline-start: 28px; font-size: 15px; line-height: 1.6; color: var(--body); }
.checklist li::before {
  content: ""; position: absolute; inset-inline-start: 0; inset-block-start: 7px;
  inline-size: 12px; block-size: 7px; border-inline-start: 2px solid var(--brand);
  border-block-end: 2px solid var(--brand); transform: rotate(-45deg);
}

.contact-panel { border: 1px solid var(--line); background: var(--surface-card); padding: clamp(22px, 2.6vw, 34px); display: grid; gap: 18px; }
.contact-panel h3 { font-size: 20px; }
.contact-panel p { font-size: 14.5px; margin: 0; }

/* ------------------------------------------------------------------ 规格卡片组 */

.def-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-inline-start: 1px solid var(--line); }
.def-item { padding: 24px; border-inline-end: 1px solid var(--line); border-block-end: 1px solid var(--line); display: grid; gap: 8px; align-content: start; }
.def-item__label { margin: 0; font-family: var(--f-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.def-item__value { margin: 0; font-family: var(--f-head); font-size: 16px; font-weight: 700; color: var(--ink); }
.def-item__meta { margin: 0; font-size: 13px; color: var(--muted); }

.scard { border: 1px solid var(--line); background: var(--canvas); padding: 22px; display: grid; gap: 10px; align-content: start; }
.scard__media { aspect-ratio: 16 / 10; overflow: hidden; background: var(--surface-card); margin: -22px -22px 6px; }
.scard__media img { inline-size: 100%; block-size: 100%; object-fit: contain; }
.scard h3 { font-size: 16px; }
.scard p { font-size: 14px; margin: 0; }
.scard__value { font-family: var(--f-head); font-size: 26px; font-weight: 700; color: var(--brand); margin: 0; }
.scard__note { font-size: 12.5px; color: var(--muted); }
.scard ul { margin: 0; padding-inline-start: 18px; font-size: 14px; }

.fig-card { display: grid; gap: 10px; }
.fig-card__media { aspect-ratio: 4 / 3; background: var(--surface-card); border: 1px solid var(--line); overflow: hidden; }
.fig-card__media img { inline-size: 100%; block-size: 100%; object-fit: contain; }
.fig-card h4 { font-size: 14px; }
.fig-card p { font-size: 13px; margin: 4px 0 0; }

.square-list { list-style: square; padding-inline-start: 20px; display: grid; gap: 8px; font-size: 15px; }
.block-flow { display: grid; gap: 14px; }
.block-flow > * { margin: 0; }

/* ------------------------------------------------------------------ 文章封面与专题 */

.post-cover { margin-top: 40px; }
.post-cover img { inline-size: 100%; border: 1px solid var(--line); }
.topic-cover { margin-top: 40px; }
.topic-cover img { inline-size: 100%; max-block-size: 460px; object-fit: cover; border: 1px solid var(--line); }

.tags--lg .chip { font-size: 12.5px; }
.tags-inline { font-family: var(--f-mono); font-size: 10.5px; color: var(--muted); letter-spacing: .1em; }

/* ------------------------------------------------------------------ 间距工具 */

.gap-top { margin-top: 24px; }
.gap-top-sm { margin-top: 12px; }
.gap-top-lg { margin-top: 48px; }

/* ------------------------------------------------------------------ 响应式 */

@media (max-width: 1180px) {
  :root { --pad: 32px; --sec-y: 76px; }
  .nav__list { gap: 20px; }
  .with-aside { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .aside-card { position: static; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 980px) {
  :root { --sec-y: 64px; }
  .nav, .header-tools .btn { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panels { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats__item:nth-child(odd) { padding-inline-start: 0; border-inline-start: 0; }
  .feature-card { grid-template-columns: minmax(0, 1fr); }
  .page-head__inner { flex-direction: column; align-items: flex-start; gap: 28px; }
  .page-head__aside { text-align: start; }
  .spec--two { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  :root { --pad: 20px; --sec-y: 52px; --nav-h: 62px; }
  body { font-size: 15.5px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .form__row { grid-template-columns: minmax(0, 1fr); }
  .hero { min-block-size: 74vh; }
  .hero__body > * { max-width: none; }
  .sec-head { margin-bottom: 32px; }
  .sec-head--row { flex-direction: column; align-items: flex-start; gap: 18px; }
  .stats { grid-template-columns: minmax(0, 1fr); }
  .stats__item { padding-inline-start: 0 !important; border-inline-start: 0 !important; }
  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .contact-fab { inset-block-end: 16px; inset-inline-end: 16px; }
  .contact-fab__btn span { display: none; }
  .contact-fab__btn { padding: 14px; }
  .to-top { inline-size: 38px; block-size: 38px; inset-block-end: 16px; inset-inline-start: 16px; }
  .article p, .article ul, .article ol { font-size: 16px; }
  .table-scroll { border: 0; }
  .swipe-hint { display: block; }
}

/* 打印：只留正文 */
@media print {
  .site-header, .site-footer, .contact-fab, .to-top, .cta-band, .hero__actions { display: none !important; }
  body { color: #000; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 11px; color: #444; }
}