/* ==============================================================================
   光网 GUANGNET · 官网设计系统 (Design System)
   行业调性：光通信芯片 / 模拟·数模混合设计 · 精密 · 可信 · 高科技
   风格基调：Enterprise Gateway + Trust & Authority（参考 MediaTek 信息架构）
   配色概念：深海军蓝底座 + 光纤"光感"青蓝渐变点缀（呼应"光网"光学主题）
   ============================================================================== */

/* ----------------------------------------------------------------------------
   1. 设计令牌 Design Tokens
   ---------------------------------------------------------------------------- */
:root {
  /* —— 品牌色 —— */
  --ink:        #0A0F1A;   /* 正文近黑 */
  --navy-900:   #08111F;
  --navy:       #0A1628;   /* 深色区/英雄区底色 */
  --navy-800:   #0E1E33;
  --navy-700:   #14263F;

  --brand-700:  #0A4DA0;   /* 深蓝 */
  --brand:      #0B5CD6;   /* 品牌主蓝（CTA/强调）*/
  --brand-500:  #2E7DF0;
  --brand-50:   #EAF2FE;

  --optic:      #22D3EE;   /* 光感青（光学点缀）*/
  --optic-300:  #67E8F9;
  --optic-500:  #06B6D4;

  /* —— 中性色 —— */
  --slate-900:  #0F172A;
  --slate-700:  #334155;
  --slate-600:  #475569;   /* 次要正文（浅色背景下最低对比）*/
  --slate-500:  #64748B;
  --slate-400:  #94A3B8;
  --line:       #E2E8F0;   /* 浅色边框 */
  --line-soft:  #EEF2F7;

  --bg:         #FFFFFF;
  --bg-soft:    #F4F8FD;   /* 微蓝浅灰区块底 */
  --bg-mute:    #F8FAFC;

  /* —— 渐变 —— */
  --grad-optic: linear-gradient(120deg, #0B5CD6 0%, #22D3EE 100%);
  --grad-optic-soft: linear-gradient(120deg, rgba(11,92,214,.12), rgba(34,211,238,.12));
  --grad-navy:  linear-gradient(160deg, #0A1628 0%, #0E1E33 60%, #0A1A30 100%);

  /* —— 排版 —— */
  --font-display: 'Sora', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', sans-serif;
  --font-sans:    'Inter', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* —— 尺度 —— */
  --container: 1240px;
  --radius:    14px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --header-h:  72px;

  /* —— 阴影 —— */
  --shadow-soft: 0 1px 2px rgba(10,22,40,.04), 0 8px 24px rgba(10,22,40,.06);
  --shadow-lift: 0 14px 44px rgba(10,22,40,.14);
  --shadow-glow: 0 0 0 1px rgba(34,211,238,.25), 0 18px 50px rgba(11,92,214,.25);

  /* —— 层级 z-index 规范 —— */
  --z-base: 1; --z-raised: 10; --z-sticky: 30; --z-header: 50; --z-overlay: 80; --z-modal: 90;

  /* —— 过渡 —— */
  --ease: cubic-bezier(.22,.61,.36,1);
  --t-fast: 160ms; --t: 240ms; --t-slow: 420ms;
}

/* ----------------------------------------------------------------------------
   2. 基础 Base
   ---------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
/* 标题颜色用 inherit：浅色区继承 body 的近黑色，深色区(.hero/.page-hero/.bg-navy 等
   已设 color:#fff)自动变白，避免深色 banner 上出现黑字看不清 */
h1, h2, h3, h4, h5 { font-family: var(--font-display); color: inherit; line-height: 1.12; letter-spacing: -.01em; margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
::selection { background: rgba(11,92,214,.16); }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 24px; }
@media (max-width: 640px){ .container { padding-inline: 18px; } }

/* 节奏：区块上下大留白（参考 MediaTek 60–80px+）*/
.section { padding-block: clamp(64px, 8vw, 112px); }
.section-sm { padding-block: clamp(48px, 6vw, 80px); }

/* ----------------------------------------------------------------------------
   3. 文字与小标签 Typography helpers
   ---------------------------------------------------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--brand);
}
.eyebrow::before { content: ""; width: 18px; height: 1.5px; background: var(--grad-optic); border-radius: 2px; }
.eyebrow.on-dark { color: var(--optic-300); }

.section-title { font-size: clamp(28px, 3.6vw, 44px); font-weight: 700; letter-spacing: -.02em; }
.section-lead { color: var(--slate-600); font-size: clamp(16px, 1.4vw, 18px); max-width: 60ch; }
.on-dark { color: #fff; }
.on-dark .section-lead, .text-muted-dark { color: rgba(226,232,240,.72); }

.gradient-text {
  background: var(--grad-optic);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ----------------------------------------------------------------------------
   4. 按钮 Buttons
   ---------------------------------------------------------------------------- */
.btn {
  --btn-bg: var(--brand); --btn-fg: #fff;
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 46px; padding-inline: 22px;
  font-family: var(--font-sans); font-size: 15px; font-weight: 600;
  border-radius: 999px; border: 1px solid transparent;
  background: var(--btn-bg); color: var(--btn-fg);
  cursor: pointer; white-space: nowrap;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t) var(--ease), background var(--t) var(--ease), border-color var(--t) var(--ease), color var(--t) var(--ease);
}
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--brand); box-shadow: 0 8px 22px rgba(11,92,214,.28); }
.btn-primary:hover { background: var(--brand-700); box-shadow: 0 12px 30px rgba(11,92,214,.36); }
.btn-optic { background: var(--grad-optic); box-shadow: 0 10px 26px rgba(11,92,214,.3); }
.btn-optic:hover { box-shadow: var(--shadow-glow); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-50); }
.btn-ghost.on-dark { color: #fff; border-color: rgba(255,255,255,.28); }
.btn-ghost.on-dark:hover { border-color: var(--optic-300); color: var(--optic-300); background: rgba(34,211,238,.08); }
.btn-lg { height: 54px; padding-inline: 28px; font-size: 16px; }
.btn:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid rgba(34,211,238,.55); outline-offset: 2px; }

/* 文字箭头链接 */
.arrow-link { display: inline-flex; align-items: center; gap: 7px; font-weight: 600; color: var(--brand); font-size: 15px; }
.arrow-link svg { width: 16px; height: 16px; transition: transform var(--t) var(--ease); }
.arrow-link:hover svg { transform: translateX(4px); }
.arrow-link.on-dark { color: var(--optic-300); }

/* ----------------------------------------------------------------------------
   5. 背景 / 装饰 Patterns
   ---------------------------------------------------------------------------- */
.bg-soft { background: var(--bg-soft); }
/* 用显式 background-color + background-image，确保叠加 .dot-grid/.line-grid 的
   背景图后底色仍为深蓝（避免被 background 简写重置为透明导致白底白字）*/
.bg-navy { background-color: var(--navy); color: #fff; }
.bg-navy-grad { background-color: var(--navy); background-image: var(--grad-navy); color: #fff; }

/* 电路点阵网格（科技底纹）*/
.dot-grid {
  background-image: radial-gradient(rgba(11,92,214,.16) 1px, transparent 1px);
  background-size: 22px 22px;
}
.dot-grid.on-dark { background-image: radial-gradient(rgba(103,232,249,.14) 1px, transparent 1px); }
.line-grid {
  background-image: linear-gradient(rgba(148,163,184,.10) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(148,163,184,.10) 1px, transparent 1px);
  background-size: 56px 56px;
}
.line-grid.on-dark {
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
}
/* 光晕 */
.optic-glow { position: relative; isolation: isolate; overflow: hidden; }
.optic-glow::before {
  content: ""; position: absolute; z-index: -1; inset: auto;
  width: 60%; height: 60%; top: -10%; right: -10%;
  background: radial-gradient(circle, rgba(34,211,238,.20), transparent 65%);
  filter: blur(20px); pointer-events: none;
}

/* ----------------------------------------------------------------------------
   6. 卡片 Cards
   ---------------------------------------------------------------------------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), border-color var(--t) var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); border-color: #cdddf3; }

/* 产品类目卡 */
.card-product { padding: 26px; display: flex; flex-direction: column; gap: 14px; height: 100%; }
.card-product .ic {
  width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center;
  background: var(--grad-optic-soft); color: var(--brand);
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}
.card-product .ic svg { width: 26px; height: 26px; }
.card-product:hover .ic { background: var(--grad-optic); color: #fff; }
.card-product h3 { font-size: 19px; font-weight: 600; }
.card-product p { color: var(--slate-600); font-size: 14.5px; margin: 0; flex: 1; }
.card-tag { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; color: var(--slate-500); text-transform: uppercase; }

/* 深色玻璃卡（用于深色区）*/
.card-glass {
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--radius); backdrop-filter: blur(8px);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}
.card-glass:hover { border-color: rgba(103,232,249,.45); background: rgba(255,255,255,.06); transform: translateY(-3px); }

/* 新闻卡 */
.card-news { overflow: hidden; display: flex; flex-direction: column; height: 100%; }
.card-news .thumb { aspect-ratio: 16/10; position: relative; overflow: hidden; background: var(--grad-navy); }
.card-news .thumb svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.card-news .body { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-news time { font-family: var(--font-mono); font-size: 12px; color: var(--slate-500); }
.card-news h3 { font-size: 17px; font-weight: 600; line-height: 1.4; }
.card-news:hover h3 { color: var(--brand); }

/* 数据指标 */
.stat .num { font-family: var(--font-display); font-weight: 700; font-size: clamp(34px, 4vw, 48px); letter-spacing: -.02em; line-height: 1; }
.stat .num .unit { font-size: .5em; color: var(--brand); margin-left: 2px; }
.stat .label { color: var(--slate-600); font-size: 14px; margin-top: 8px; }
.on-dark .stat .label { color: rgba(226,232,240,.66); }
.on-dark .stat .num { color: #fff; }

/* 规格小芯片 */
.spec-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); color: #E2E8F0;
}
.spec-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--optic); box-shadow: 0 0 8px var(--optic); }

/* 通用 pill 标签 */
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600; background: var(--brand-50); color: var(--brand-700); }

/* ----------------------------------------------------------------------------
   7. 头部 Header / 巨型导航 Mega Menu
   ---------------------------------------------------------------------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-header);
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.site-header.scrolled { background: rgba(255,255,255,.94); border-bottom-color: var(--line); box-shadow: 0 2px 18px rgba(10,22,40,.06); }
.header-inner { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 24px; display: flex; align-items: center; gap: 28px; }

/* Logo */
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand .logo-img { display: block; width: auto; height: 56px; object-fit: contain; }
.brand .mark { width: 38px; height: 38px; }
.brand .wm { display: flex; flex-direction: column; line-height: 1; }
.brand .wm .cn { font-family: var(--font-display); font-weight: 700; font-size: 19px; color: var(--ink); letter-spacing: .02em; }
.brand .wm .en { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .26em; color: var(--slate-500); margin-top: 3px; }

/* 主导航 */
.nav { display: flex; align-items: center; gap: 2px; margin-left: 6px; }
.nav-item { position: static; }
.nav-link {
  display: inline-flex; align-items: center; gap: 5px;
  height: var(--header-h); padding-inline: 15px;
  font-size: 15px; font-weight: 500; color: var(--slate-700);
  cursor: pointer; transition: color var(--t-fast) var(--ease);
}
.nav-link:hover, .nav-item.open .nav-link { color: var(--brand); }
.nav-link[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav-link .chev { width: 14px; height: 14px; transition: transform var(--t) var(--ease); color: var(--slate-400); }
.nav-item.open .nav-link .chev { transform: rotate(180deg); color: var(--brand); }

.header-cta { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.lang-switch { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; color: var(--slate-600); padding: 8px 10px; border-radius: 8px; cursor: pointer; transition: color var(--t-fast), background var(--t-fast); }
.lang-switch:hover { color: var(--brand); background: var(--brand-50); }
.lang-switch svg { width: 16px; height: 16px; }

/* Mega 面板 */
.mega {
  position: absolute; left: 0; right: 0; top: var(--header-h);
  background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  box-shadow: 0 24px 50px rgba(10,22,40,.12);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t);
  z-index: var(--z-header);
}
.nav-item.open .mega { opacity: 1; visibility: visible; transform: translateY(0); }
.mega-inner { max-width: var(--container); margin-inline: auto; padding: 34px 24px 38px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; }
.mega-col-title { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--slate-500); margin-bottom: 14px; }
.mega-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 20px; }
.mega-link { display: flex; gap: 12px; padding: 11px 12px; border-radius: 10px; transition: background var(--t-fast) var(--ease); }
.mega-link:hover { background: var(--bg-soft); }
.mega-link .mi { width: 38px; height: 38px; flex-shrink: 0; border-radius: 9px; display: grid; place-items: center; background: var(--grad-optic-soft); color: var(--brand); }
.mega-link .mi svg { width: 20px; height: 20px; }
.mega-link .mt { font-size: 14.5px; font-weight: 600; color: var(--ink); }
.mega-link .md { font-size: 12.5px; color: var(--slate-500); margin-top: 2px; line-height: 1.45; }
.mega-link:hover .mt { color: var(--brand); }
/* Mega 右侧推广卡 */
.mega-feature { border-radius: var(--radius); padding: 26px; color: #fff; background: var(--grad-navy); position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: flex-end; min-height: 220px; }
.mega-feature .eyebrow { color: var(--optic-300); }
.mega-feature h4 { font-size: 19px; font-weight: 700; margin: 10px 0 8px; }
.mega-feature p { font-size: 13.5px; color: rgba(226,232,240,.74); margin: 0 0 16px; }

/* 移动端开关 */
.nav-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 10px; background: #fff; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle svg { width: 22px; height: 22px; color: var(--ink); }

/* ----------------------------------------------------------------------------
   8. 移动端导航
   ---------------------------------------------------------------------------- */
.m-nav { position: fixed; inset: var(--header-h) 0 0 0; z-index: var(--z-overlay); background: #fff; overflow-y: auto; padding: 18px; transform: translateX(100%); transition: transform var(--t-slow) var(--ease); visibility: hidden; }
.m-nav.open { transform: translateX(0); visibility: visible; }
.m-acc { border-bottom: 1px solid var(--line-soft); }
.m-acc > button { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 16px 6px; font-family: var(--font-display); font-size: 17px; font-weight: 600; color: var(--ink); background: none; border: 0; cursor: pointer; }
.m-acc > button svg { width: 18px; height: 18px; color: var(--slate-400); transition: transform var(--t); }
.m-acc.open > button svg { transform: rotate(180deg); }
.m-acc .panel { display: none; padding: 2px 6px 14px; }
.m-acc.open .panel { display: block; }
.m-acc .panel a { display: block; padding: 10px 12px; color: var(--slate-600); font-size: 15px; border-radius: 8px; }
.m-acc .panel a:hover { background: var(--bg-soft); color: var(--brand); }
.m-nav .m-cta { margin-top: 22px; display: grid; gap: 12px; }

/* ----------------------------------------------------------------------------
   9. 英雄区 Hero
   ---------------------------------------------------------------------------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  padding-top: calc(var(--header-h) + clamp(48px, 7vw, 96px)); padding-bottom: clamp(56px, 7vw, 104px);
  /* 真实背景图 + 深色渐变叠加（左侧压暗保证标题可读，右侧透出蓝青光路）*/
  background-color: var(--navy);
  background-image: linear-gradient(108deg, rgba(8,17,31,.95) 0%, rgba(9,20,38,.82) 46%, rgba(8,26,50,.55) 100%), url('../img/hero.jpg');
  background-size: cover; background-position: center right; background-repeat: no-repeat;
}
.hero-deco { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero .container { position: relative; z-index: 2; }
.hero h1 { font-size: clamp(34px, 5.4vw, 66px); font-weight: 700; letter-spacing: -.025em; line-height: 1.06; }
.hero .lead { color: rgba(226,232,240,.78); font-size: clamp(16px, 1.6vw, 19px); max-width: 56ch; margin-top: 20px; }
.hero-glow { position: absolute; width: 620px; height: 620px; border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.28), transparent 62%); filter: blur(30px); top: -180px; right: -120px; z-index: 1; }

/* 页面通用小英雄（子页）*/
.page-hero {
  position: relative; overflow: hidden; color: #fff;
  padding-top: calc(var(--header-h) + clamp(44px, 6vw, 72px)); padding-bottom: clamp(40px, 6vw, 64px);
  /* 真实背景图 + 深色渐变叠加（内页统一沉稳的 PCB 质感，标题区压暗）*/
  background-color: var(--navy);
  background-image: linear-gradient(108deg, rgba(8,17,31,.96) 0%, rgba(9,20,38,.88) 52%, rgba(11,30,53,.70) 100%), url('../img/page-hero.jpg');
  background-size: cover; background-position: center; background-repeat: no-repeat;
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(30px, 4.4vw, 52px); font-weight: 700; }
.page-hero .lead { color: rgba(226,232,240,.74); margin-top: 14px; max-width: 60ch; }
.crumbs { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(226,232,240,.6); margin-bottom: 18px; }
.crumbs a:hover { color: var(--optic-300); }
.crumbs .sep { color: rgba(226,232,240,.34); }

/* ----------------------------------------------------------------------------
   10. 标签页 Tabs（应用领域切换）
   ---------------------------------------------------------------------------- */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.tab { padding: 10px 18px; border-radius: 999px; font-size: 14.5px; font-weight: 600; color: var(--slate-600); background: var(--bg-soft); border: 1px solid var(--line); cursor: pointer; transition: all var(--t-fast) var(--ease); }
.tab:hover { color: var(--brand); border-color: #cdddf3; }
.tab.active { color: #fff; background: var(--brand); border-color: var(--brand); box-shadow: 0 8px 20px rgba(11,92,214,.26); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ----------------------------------------------------------------------------
   11. Logo 墙 / 分隔
   ---------------------------------------------------------------------------- */
.logo-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 22px; align-items: center; }
.logo-wall .lg { height: 30px; display: grid; place-items: center; opacity: .5; filter: grayscale(1); transition: opacity var(--t), filter var(--t); }
.logo-wall .lg:hover { opacity: .9; filter: grayscale(0); }
.logo-wall .lg svg { height: 100%; width: auto; }
.divider { height: 1px; background: var(--line); border: 0; }

/* 特性行（图文交替）*/
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: center; }
.feature-row.reverse > .media { order: 2; }
.feature-media { border-radius: var(--radius-lg); overflow: hidden; background: var(--grad-navy); aspect-ratio: 4/3; position: relative; box-shadow: var(--shadow-soft); }

/* ----------------------------------------------------------------------------
   12. 页脚 Footer
   ---------------------------------------------------------------------------- */
.site-footer { background: var(--navy-900); color: #fff; }
.footer-top { padding-block: clamp(48px, 6vw, 72px); border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 40px; }
.footer-brand .brand .wm .cn { color: #fff; }
.footer-brand .brand .wm .en { color: rgba(255,255,255,.5); }
.footer-brand .brand { padding: 8px 12px; border-radius: 12px; background: #fff; }
.footer-brand .brand .logo-img { height: 62px; }
.footer-brand p { color: rgba(226,232,240,.6); font-size: 14px; margin: 18px 0 0; max-width: 30ch; }
.footer-col h5 { font-size: 13px; font-weight: 600; color: #fff; letter-spacing: .04em; margin-bottom: 16px; }
.footer-col a { display: block; padding: 6px 0; font-size: 14px; color: rgba(226,232,240,.62); transition: color var(--t-fast); }
.footer-col a:hover { color: var(--optic-300); }
.footer-social { display: flex; gap: 10px; margin-top: 22px; }
.footer-social a { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: rgba(255,255,255,.06); color: rgba(255,255,255,.7); transition: background var(--t), color var(--t); }
.footer-social a:hover { background: var(--brand); color: #fff; }
.footer-social svg { width: 18px; height: 18px; }
.footer-bottom { padding-block: 22px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; }
.footer-bottom, .footer-bottom a { font-size: 13px; color: rgba(226,232,240,.5); }
.footer-bottom a:hover { color: rgba(255,255,255,.85); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 18px; }

/* 订阅 */
.subscribe { display: flex; gap: 8px; margin-top: 18px; max-width: 320px; }
.subscribe input { flex: 1; height: 44px; padding-inline: 14px; border-radius: 10px; border: 1px solid rgba(255,255,255,.14); background: rgba(255,255,255,.05); color: #fff; font-size: 14px; }
.subscribe input::placeholder { color: rgba(255,255,255,.4); }
.subscribe input:focus { outline: none; border-color: var(--optic); }
.subscribe button { height: 44px; width: 44px; flex-shrink: 0; border-radius: 10px; border: 0; background: var(--grad-optic); color: #fff; cursor: pointer; display: grid; place-items: center; }
.subscribe button svg { width: 18px; height: 18px; }

/* ----------------------------------------------------------------------------
   13. 进入动画 Reveal（尊重 reduced-motion）
   ---------------------------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
[data-stagger] > * { transition-delay: calc(var(--i, 0) * 70ms); }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .btn:hover, .card:hover { transform: none !important; }
}

/* ----------------------------------------------------------------------------
   14. 响应式 Responsive
   ---------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .nav, .header-cta .btn, .lang-switch { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-cta { margin-left: auto; }
  .mega { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .logo-wall { grid-template-columns: repeat(3, 1fr); gap: 18px 28px; }
}
@media (max-width: 720px) {
  .feature-row { grid-template-columns: 1fr; }
  .feature-row.reverse > .media { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
}

/* 通用工具 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
@media (max-width: 960px){ .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px){ .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } }
.stack-cta { display: flex; flex-wrap: wrap; gap: 14px; }

/* 客户价值与全周期流程 */
.value-grid, .process-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.value-grid { grid-template-columns: repeat(4, 1fr); }
.value-card { padding: 24px; min-height: 230px; }
.value-card:last-child { grid-column: span 2; }
.value-no, .process-no {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
}
.value-no { color: var(--optic-300); background: rgba(34,211,238,.09); border: 1px solid rgba(103,232,249,.22); }
.value-card h3 { margin: 20px 0 10px; color: #fff; font-size: 18px; line-height: 1.35; }
.value-card p { margin: 0; color: rgba(226,232,240,.68); font-size: 14px; }
.process-grid { grid-template-columns: repeat(4, 1fr); counter-reset: delivery-step; }
.process-step {
  position: relative; min-height: 210px; padding: 24px;
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  box-shadow: var(--shadow-soft);
}
.process-step:last-child { grid-column: span 2; }
.process-no { color: var(--brand-700); background: var(--brand-50); border: 1px solid #cfe0f7; }
.process-step h3 { margin: 18px 0 10px; font-size: 18px; }
.process-step p { margin: 0; color: var(--slate-600); font-size: 14px; }
@media (max-width: 960px) {
  .value-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .value-grid, .process-grid { grid-template-columns: 1fr; }
  .value-card:last-child, .process-step:last-child { grid-column: auto; }
  .value-card, .process-step { min-height: 0; }
}

/* ==============================================================================
   15. 内页复用组件 Inner-page components
   ============================================================================== */
/* 锚点子导航（页面内"下钻"快速跳转）*/
.subnav { position: sticky; top: var(--header-h); z-index: var(--z-sticky); background: rgba(255,255,255,.9); backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--line); }
.subnav-inner { max-width: var(--container); margin-inline: auto; padding: 0 24px; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.subnav-inner::-webkit-scrollbar { display: none; }
.subnav a { white-space: nowrap; padding: 16px 14px; font-size: 14px; font-weight: 500; color: var(--slate-600); border-bottom: 2px solid transparent; transition: color var(--t-fast), border-color var(--t-fast); }
.subnav a:hover, .subnav a.active { color: var(--brand); border-bottom-color: var(--brand); }

/* 类目标题（产品/技术分区）*/
.cat-head { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
.cat-head .ic { width: 54px; height: 54px; border-radius: 13px; display: grid; place-items: center; background: var(--grad-optic-soft); color: var(--brand); flex-shrink: 0; }
.cat-head .ic svg { width: 28px; height: 28px; }
.cat-head .tag { font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em; color: var(--slate-500); text-transform: uppercase; }
.cat-head h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 700; }
.anchor-offset { scroll-margin-top: calc(var(--header-h) + 64px); }

/* 产品型号卡 */
.prod-card { padding: 22px; display: flex; flex-direction: column; gap: 12px; height: 100%; }
.prod-card .pn { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: var(--brand); letter-spacing: .04em; }
.prod-card h4 { font-size: 16px; font-weight: 600; }
.prod-card .specs { display: grid; gap: 7px; margin: 2px 0 0; }
.prod-card .specs li { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--slate-600); border-bottom: 1px dashed var(--line); padding-bottom: 6px; }
.prod-card .specs li span:last-child { font-family: var(--font-mono); color: var(--ink); }
.status { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; }
.status.mp { background: #E7F6EC; color: #15803D; }
.status.sample { background: #FEF3E2; color: #B45309; }
.status.dev { background: var(--brand-50); color: var(--brand-700); }
.status .d { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* 时间线（发展历程）*/
.timeline { position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--brand), var(--optic)); }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item::before { content: ""; position: absolute; left: -28px; top: 4px; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--brand); }
.tl-item .yr { font-family: var(--font-display); font-weight: 700; font-size: 20px; color: var(--brand); }
.tl-item h4 { font-size: 17px; font-weight: 600; margin: 4px 0 6px; }
.tl-item p { color: var(--slate-600); font-size: 14.5px; margin: 0; }

/* 表格 */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.spec-table thead th { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--slate-500); background: var(--bg-soft); }
.spec-table tbody tr:hover { background: var(--bg-mute); }
.spec-table td.mono { font-family: var(--font-mono); }

/* 产品规格与架构信息 */
.metric-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 28px 0; }
.metric-box { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.metric-box strong { display: block; font-family: var(--font-display); font-size: clamp(24px, 3vw, 34px); color: var(--brand-700); line-height: 1.05; }
.metric-box span { display: block; margin-top: 8px; color: var(--slate-500); font-size: 12.5px; }
.architecture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 24px 0 28px; }
.architecture-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.architecture-card .tag { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: var(--brand-50); color: var(--brand-700); font-family: var(--font-mono); font-size: 11px; font-weight: 600; }
.architecture-card h3 { margin: 14px 0 8px; font-size: 18px; }
.architecture-card p { margin: 0; color: var(--slate-600); font-size: 14px; }
.spec-section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.spec-section-head > div { max-width: 780px; }
.spec-section-head p { margin: 12px 0 0; color: var(--slate-600); }
.spec-table.dense { min-width: 980px; }
.spec-table.dense th, .spec-table.dense td { padding: 12px 14px; white-space: nowrap; font-size: 12.5px; }
.spec-table.dense td:first-child { font-weight: 600; color: var(--brand-700); }
.source-caption { display: block; width: 100%; padding: 12px 16px; border-top: 1px solid var(--line); color: var(--slate-500); font-size: 12.5px; background: var(--bg-soft); }
.capability-list { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; }
.capability-item { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 22px; border-bottom: 1px dashed var(--line); }
.capability-item:last-child { border-bottom: 0; }
.capability-item strong { color: var(--brand-700); font-family: var(--font-display); }
.capability-item p { margin: 0; color: var(--slate-600); font-size: 14px; }
.mode-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.mode-chip { padding: 14px 10px; border: 1px solid var(--line); border-radius: 10px; text-align: center; background: var(--bg-soft); }
.mode-chip strong { display: block; font-size: 14px; color: var(--brand-700); }
.mode-chip span { display: block; margin-top: 4px; color: var(--slate-500); font-size: 11.5px; }

@media (max-width: 900px) {
  .metric-strip { grid-template-columns: repeat(2, 1fr); }
  .architecture-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .metric-strip { grid-template-columns: 1fr 1fr; }
  .metric-box { padding: 16px; }
  .spec-section-head { align-items: flex-start; flex-direction: column; }
  .capability-item { grid-template-columns: 1fr; gap: 8px; }
  .mode-row { grid-template-columns: 1fr; }
}

/* FAQ 手风琴 */
.faq { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 0; }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 22px; background: none; border: 0; cursor: pointer; text-align: left; font-family: var(--font-display); font-size: 16px; font-weight: 600; color: var(--ink); }
.faq-q svg { width: 20px; height: 20px; color: var(--slate-400); flex-shrink: 0; transition: transform var(--t); }
.faq-item.open .faq-q svg { transform: rotate(45deg); color: var(--brand); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height var(--t) var(--ease); }
.faq-a p { padding: 0 22px 20px; margin: 0; color: var(--slate-600); font-size: 14.5px; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field { display: flex; flex-direction: column; gap: 7px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13.5px; font-weight: 600; color: var(--slate-700); }
.form-field label .req { color: #DC2626; }
.form-field input, .form-field select, .form-field textarea {
  height: 46px; padding: 0 14px; border: 1px solid var(--line); border-radius: 10px; font: inherit; font-size: 14.5px; color: var(--ink); background: #fff; transition: border-color var(--t-fast), box-shadow var(--t-fast); width: 100%;
}
.form-field textarea { height: auto; padding: 12px 14px; resize: vertical; min-height: 120px; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(11,92,214,.12); }
@media (max-width: 640px){ .form-grid { grid-template-columns: 1fr; } }

/* 信息卡（联系方式 / IR 文档）*/
.info-card { padding: 24px; display: flex; gap: 16px; align-items: flex-start; }
.info-card .ic { width: 46px; height: 46px; border-radius: 11px; display: grid; place-items: center; background: var(--grad-optic-soft); color: var(--brand); flex-shrink: 0; }
.info-card .ic svg { width: 22px; height: 22px; }
.info-card h4 { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.info-card p { margin: 0; color: var(--slate-600); font-size: 14px; }

.doc-row { display: flex; align-items: center; gap: 16px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; transition: border-color var(--t), box-shadow var(--t); }
.doc-row:hover { border-color: #cdddf3; box-shadow: var(--shadow-soft); }
.doc-row .ic { width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center; background: var(--bg-soft); color: var(--brand); flex-shrink: 0; }
.doc-row .meta { flex: 1; }
.doc-row .meta h4 { font-size: 15px; font-weight: 600; margin: 0; }
.doc-row .meta span { font-family: var(--font-mono); font-size: 12px; color: var(--slate-500); }

/* 占位提示（标记待补充内容）*/
.placeholder-note { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 8px; background: #FEF9E7; border: 1px dashed #E5C76B; color: #92700E; font-size: 12.5px; font-family: var(--font-mono); }

/* 公司实材与技术专栏 */
.product-showcase { display: grid; grid-template-columns: minmax(180px, .7fr) 1.3fr; gap: clamp(24px, 5vw, 64px); align-items: center; }
.product-showcase.reverse { grid-template-columns: 1.3fr minmax(180px, .7fr); }
.product-showcase.reverse .product-chip { order: 2; }
.product-chip { min-height: 280px; display: grid; place-items: center; padding: 28px; border-radius: var(--radius-lg); background: linear-gradient(145deg,#f7fbff,#e7f1fd); border: 1px solid var(--line); overflow: hidden; }
.product-chip img { width: min(100%, 360px); height: auto; filter: drop-shadow(0 20px 24px rgba(10,22,40,.16)); transition: transform var(--t-slow) var(--ease); }
.product-chip:hover img { transform: translateY(-6px) rotate(-1deg); }
.product-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }
.honor-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.honor-card { overflow: hidden; }
.honor-card .honor-media { aspect-ratio: 4/3; padding: 14px; display: grid; place-items: center; background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.honor-card .honor-media img { width: 100%; height: 100%; object-fit: contain; }
.honor-card .honor-body { padding: 18px 20px 22px; }
.honor-card h3 { margin: 0 0 6px; font-size: 17px; }
.honor-card p { margin: 0; color: var(--slate-600); font-size: 13.5px; }
.article-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 20px; }
.article-card { padding: clamp(24px,3vw,34px); display: flex; flex-direction: column; gap: 14px; min-height: 250px; }
.article-card .article-no { font-family: var(--font-mono); color: var(--brand); font-size: 12px; letter-spacing: .1em; }
.article-card h3 { font-size: clamp(20px,2.2vw,25px); line-height: 1.35; }
.article-card p { margin: 0; color: var(--slate-600); flex: 1; }
.article-body { max-width: 820px; margin-inline: auto; }
.article-body p { color: var(--slate-700); font-size: 16px; line-height: 1.9; margin: 0 0 20px; }
.article-body h2 { font-size: clamp(24px,3vw,34px); margin: 48px 0 16px; }
.article-body h3 { font-size: 20px; margin: 30px 0 12px; }
.article-body ul { color: var(--slate-700); line-height: 1.8; padding-left: 1.2em; }
.article-body li + li { margin-top: 8px; }
.kicker-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 18px; }
.source-note { padding: 16px 18px; border-left: 3px solid var(--brand); background: var(--brand-50); color: var(--slate-700); border-radius: 0 10px 10px 0; font-size: 14px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-soft); }
.ip-table { width: 100%; min-width: 760px; border-collapse: collapse; }
.ip-table th, .ip-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; font-size: 13.5px; }
.ip-table th { position: sticky; top: 0; background: var(--bg-soft); color: var(--slate-600); font-size: 12px; letter-spacing: .04em; white-space: nowrap; }
.ip-table td:first-child { font-family: var(--font-mono); color: var(--brand-700); white-space: nowrap; }
.ip-table tbody tr:last-child td { border-bottom: 0; }
.ip-table tbody tr:hover { background: var(--bg-mute); }
.event-facts { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 28px 0; }
.event-fact { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.event-fact span { display: block; color: var(--slate-500); font-size: 12px; margin-bottom: 6px; }
.event-fact strong { font-size: 15px; line-height: 1.5; }

@media (max-width: 860px) {
  .honor-grid { grid-template-columns: repeat(2,1fr); }
  .article-grid { grid-template-columns: 1fr; }
  .event-facts { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .brand .logo-img { height: 50px; }
  .event-feature { grid-template-columns: 1fr !important; }
  .product-showcase, .product-showcase.reverse { grid-template-columns: 1fr; }
  .product-showcase.reverse .product-chip { order: 0; }
  .product-chip { min-height: 230px; }
  .home-product-media { aspect-ratio: 1 / 1; }
}
@media (max-width: 560px) {
  .honor-grid { grid-template-columns: 1fr; }
}