/* =============================================================
   组件与构成层 (Components) —— 导航 / 英雄区 / 卡片 / 案例 / 联系 / 页脚
   方向：精密科技。非对称、破格、对角线、重叠、辉光。
   ============================================================= */

/* ============ 顶部导航 ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: background var(--dur-base) var(--ease-out), border-color var(--dur-base);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: var(--surface-glass);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--color-line);
}
.nav-inner {
  width: 100%; max-width: var(--maxw); margin-inline: auto;
  padding-inline: clamp(20px,5vw,40px);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--font-display); font-weight: 700; letter-spacing: -.01em; }
.brand .logo-mark {
  width: 38px; height: 38px; flex: none; display: block;
  filter: drop-shadow(0 0 10px rgba(30,127,232,.45));
}
.brand .logo-mark.word { width: 132px; height: auto; margin-left: 2px; }
.brand .brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand .brand-text b { font-size: 16px; }
.brand .brand-text span { font-size: 10.5px; letter-spacing: .18em; color: var(--color-muted); text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  position: relative;
  padding: 10px 16px; font-size: 15px; color: var(--color-muted);
  border-radius: var(--radius-pill);
  white-space: nowrap;   /* 窄屏禁止菜单项逐字断行 */
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast);
}
.nav-links a:hover { color: var(--color-text); background: var(--color-accent-soft); }
.nav-links a.active { color: var(--color-text); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan)); border-radius: 2px;
}

.nav-cta { display: flex; align-items: center; gap: 12px; flex: none; }

/* 主题切换（暗/亮）：默认隐藏，脚本可用时由 html.js 打开 */
.theme-toggle {
  display: none; place-items: center;
  width: 40px; height: 40px; flex: none;
  border: 1px solid var(--glass-border); border-radius: var(--radius-md);
  background: var(--glass-bg); color: var(--color-muted);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast), background var(--dur-fast), transform var(--dur-base) var(--ease-spring);
}
html.js .theme-toggle { display: grid; }
.theme-toggle:hover { color: var(--color-accent); border-color: var(--glass-border-hover); background: var(--glass-bg-hover); transform: rotate(-18deg) scale(1.04); }
.theme-toggle svg { width: 18px; height: 18px; display: block; }
.theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
/* 亮色下白色字标 logo 不可见，换用蓝色 emblem */
.brand .logo-mark[data-logo="mark"] { display: none; }
[data-theme="light"] .brand .logo-mark[data-logo="full"] { display: none; }
[data-theme="light"] .brand .logo-mark[data-logo="mark"] { display: block; }

/* 汉堡（移动端）*/
.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--glass-border); background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)) saturate(150%); -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%); border-radius: var(--radius-md); position: relative; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast);
}
.nav-toggle span { top: 21px; left: 11px; }
/* 伪元素以 span 为定位基准，left/top 必须是「相对 span 的偏移」。
   若把它们和 span 写进同一条 left:11px 规则，会再叠加 11px，
   三条线就左右错开（中线偏左、上下线偏右）。 */
.nav-toggle span::before { top: -7px; left: 0; }
.nav-toggle span::after  { top: 7px;  left: 0; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span::after  { transform: translateY(-7px) rotate(-45deg); }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  min-height: 48px; padding: 0 26px;
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  border-radius: var(--radius-pill); border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), background var(--dur-fast), border-color var(--dur-fast);
  will-change: transform;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-strong));
  color: var(--color-on-accent); box-shadow: 0 10px 30px rgba(30,107,255,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(61,169,255,.45); }
.btn-ghost {
  background: transparent; color: var(--color-text); border-color: var(--color-line-strong);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: 14px; }

/* ============ 英雄区 (Hero) ============ */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  padding-top: calc(var(--nav-h) + 40px); padding-bottom: var(--space-7);
  overflow: hidden;
}
.hero-grid {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center;
  width: 100%; max-width: var(--maxw); margin-inline: auto;
  padding-inline: clamp(20px,5vw,40px);
}
.hero-copy { position: relative; z-index: 2; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 18px; border-radius: var(--radius-pill);
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  box-shadow: var(--shadow-1), inset 0 1px 0 var(--glass-inner);
  font-size: 13px; color: var(--color-text); margin-bottom: var(--space-4);
  transition: transform var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-out);
}
.hero-badge:hover { transform: translateY(-2px); border-color: var(--glass-border-hover); }
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-cyan); box-shadow: 0 0 12px var(--color-cyan); animation: pulse 2.4s var(--ease-out) infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.45;transform:scale(.8)} }

.hero h1 {
  font-size: clamp(40px, 6.4vw, 86px);
  line-height: 1.02; letter-spacing: -.03em; margin-bottom: var(--space-4);
}
.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .grad {
  background: linear-gradient(110deg, var(--color-accent) 0%, var(--color-cyan) 42%, var(--grad-end) 68%, var(--color-accent) 100%);
  background-size: 230% 100%; background-position: 0% 50%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: gradShift 11s var(--ease-out) infinite alternate;
}
@keyframes gradShift { to { background-position: 100% 50%; } }
.hero-slogan {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(18px, 2.4vw, 26px); letter-spacing: .12em;
  color: var(--color-text); margin-bottom: var(--space-4);
}
.hero-slogan .sep { color: var(--color-accent); margin-inline: 10px; }
.hero-lead { font-size: clamp(16px,1.5vw,18px); max-width: 540px; margin-bottom: var(--space-5); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: var(--space-6); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 28px; }
.hero-meta .item { display: flex; flex-direction: column; }
.hero-meta .item b { font-family: var(--font-display); font-size: 26px; color: var(--color-text); font-variant-numeric: tabular-nums; }
.hero-meta .item span { font-size: 13px; color: var(--color-muted); }

/* 英雄区右侧：玻璃核心 + 渐变轨道（对称、留白、缓慢自转）*/
.hero-visual { position: relative; aspect-ratio: 1/1; display: grid; place-items: center; }
.hero-visual svg { width: 104%; height: auto; overflow: visible; filter: drop-shadow(0 0 34px var(--glow-1)); }
/* 渐变停靠色统一走令牌，暗/亮各自成立 */
.hero-visual .s-accent { stop-color: var(--color-accent); }
.hero-visual .s-cyan   { stop-color: var(--color-cyan); }
.hero-visual .s-violet { stop-color: var(--color-accent-2); }
.hero-visual .s-aura-1 { stop-color: var(--glow-accent); }
.hero-visual .s-aura-2 { stop-color: var(--glow-1); }
.hero-visual .s-aura-3 { stop-color: transparent; }
.hero-visual .s-disc-1 { stop-color: var(--glass-bg-hover); }
.hero-visual .s-disc-2 { stop-color: var(--glass-bg); }
.hero-visual .aura { transform-origin: 50% 50%; animation: auraPulse 9s var(--ease-out) infinite alternate; }
@keyframes auraPulse { from { opacity: .7; transform: scale(.94); } to { opacity: 1; transform: scale(1.05); } }
.hero-visual .spoke { opacity: .5; }
.hero-visual .glass-node { fill: var(--glass-bg); stroke: var(--color-accent); stroke-width: 2; }
.hero-visual .ring { transform-origin: 50% 50%; }
.hero-visual .spin-slow { animation: spin 38s linear infinite; }
.hero-visual .spin-rev  { animation: spin 26s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }
.hero-visual .node { animation: floaty 6s ease-in-out infinite; }
@keyframes floaty { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }

/* 滚动提示 */
.scroll-hint {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--color-muted); font-size: 11px; letter-spacing: .25em; z-index: 3;
}
.scroll-hint .bar { width: 1px; height: 40px; background: linear-gradient(var(--color-accent), transparent); position: relative; overflow: hidden; }
.scroll-hint .bar::after { content:""; position:absolute; top:-40px; left:0; width:1px; height:40px; background: var(--color-cyan); animation: scrolldown 1.8s var(--ease-out) infinite; }
@keyframes scrolldown { to { top: 40px; } }

/* ============ 信任条 / Logo 跑马灯 ============ */
.marquee { border-block: 1px solid var(--glass-border); padding-block: 22px; overflow: hidden; background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)) saturate(150%); -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%); }
.marquee-track { display: flex; gap: 56px; width: max-content; animation: marquee 28s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
.marquee-item { font-family: var(--font-display); font-weight: 600; font-size: 17px; color: var(--color-muted); white-space: nowrap; letter-spacing: .02em; display: inline-flex; align-items: center; gap: 10px; }
.marquee-item::before { content:""; width:7px; height:7px; border-radius:2px; background: var(--color-accent); transform: rotate(45deg); opacity:.7; }

/* ============ 数据指标条 ============ */
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--glass-border); border: 1px solid var(--glass-border); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-1); backdrop-filter: blur(var(--glass-blur)) saturate(150%); -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%); }
.stat {
  background-color: var(--glass-bg); background-image: linear-gradient(180deg, var(--glow-3), transparent 72%);
  padding: var(--space-5) var(--space-4);
  position: relative; transition: background-color var(--dur-base) var(--ease-out);
}
.stat::after { content: ""; position: absolute; left: var(--space-4); bottom: 0; height: 2px; width: 0; background: linear-gradient(90deg, var(--color-accent), var(--color-cyan)); transition: width var(--dur-base) var(--ease-out); }
.stat:hover { background-color: var(--glass-bg-hover); }
.stat:hover::after { width: calc(100% - var(--space-4) * 2); }
.stat .num { font-family: var(--font-display); font-weight: 700; font-size: clamp(34px,4vw,54px); color: var(--color-text); font-variant-numeric: tabular-nums; line-height: 1; }
.stat .num .plus { color: var(--color-accent); }
.stat .label { margin-top: 10px; font-size: 14px; color: var(--color-muted); }

/* ============ 通用卡片网格 ============ */
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: var(--space-4); }

/* ============ 玻璃拟态基座（卡片共用）============ */
/* 统一语言：半透表面 + 背景模糊 + 大圆角 + 顶沿内高光 + 细描边。
   各卡片只再声明自己的渐变（background-image）与悬停位移。 */
.service-card, .value-card, .pill-card, .case-card, .mission-card,
.contact-row, .contact-card, .faq-item, .ai-scenarios .tag {
  background-color: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-1), inset 0 1px 0 var(--glass-inner);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out);
}
/* 不支持背景模糊的浏览器（旧版 Firefox 等）：改用不透明表面，保证可读性 */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .service-card, .value-card, .pill-card, .case-card, .mission-card,
  .contact-row, .contact-card, .faq-item, .ai-scenarios .tag,
  .cta-band, .arch-layer, .step .node, .stat, .cert, .marquee,
  .case-filter button, .field input, .field textarea, .field select {
    background-color: var(--color-surface);
  }
}

/* 悬停时斜向扫过的高光带 */
.service-card::after, .value-card::after, .pill-card::after, .case-card::after, .contact-card::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  border-radius: inherit; background: var(--sheen);
  transform: translateX(-105%);
  transition: transform var(--dur-slow) var(--ease-out);
}
.service-card:hover::after, .value-card:hover::after, .pill-card:hover::after,
.case-card:hover::after, .contact-card:hover::after { transform: translateX(105%); }
/* 图标微动效：悬停时轻微上浮 + 侧倾 */
.service-card .ic, .value-card .v-ic, .contact-row .c-ic, .pill-card .tag {
  transition: transform var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}
.service-card:hover .ic, .value-card:hover .v-ic, .contact-row:hover .c-ic, .pill-card:hover .tag {
  transform: translateY(-3px) rotate(-6deg) scale(1.06);
}

/* ============ 服务卡片（玻璃拟态 + 大圆角）============ */
.service-card {
  position: relative; padding: var(--space-5) var(--space-4) var(--space-4);
  background-image: radial-gradient(120% 90% at 10% 0%, var(--glow-3), transparent 62%);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: linear-gradient(140deg, var(--color-accent-line), transparent 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity var(--dur-base);
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); border-color: var(--glass-border-hover); }
.service-card:hover::before { opacity: 1; }
.service-card .corner {
  position: absolute; top: 18px; right: 18px; width: 34px; height: 34px;
  border-top: 2px solid var(--color-accent); border-right: 2px solid var(--color-accent);
  border-radius: 0 12px 0 0; opacity: .45;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-spring);
}
.service-card:hover .corner { opacity: 1; transform: translate(3px, -3px); }
.service-card .idx { font-family: var(--font-display); font-size: 13px; color: var(--color-accent); letter-spacing: .2em; }
.service-card .ic {
  width: 56px; height: 56px; border-radius: 18px; display: grid; place-items: center; margin: 14px 0 18px;
  background: linear-gradient(140deg, var(--color-accent-soft), transparent 72%);
  border: 1px solid var(--glass-border); color: var(--color-accent);
  box-shadow: inset 0 1px 0 var(--glass-inner);
}
.service-card .ic svg { width: 28px; height: 28px; }
.service-card h3 { margin-bottom: 10px; }
.service-card p { font-size: 15px; }
.service-card ul { margin-top: 16px; list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.service-card ul li { font-size: 12.5px; color: var(--color-muted); padding: 5px 11px; border: 1px solid var(--glass-border); border-radius: var(--radius-pill); background: var(--glass-bg); transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), transform var(--dur-base) var(--ease-spring); }
.service-card:hover ul li { color: var(--color-text); border-color: var(--glass-border-hover); }
.service-card ul li:hover { transform: translateY(-2px); }

/* ============ 产品 / 方案分类网格 ============ */
.pill-card {
  position: relative; padding: var(--space-4);
  background-image: linear-gradient(100deg, var(--glow-3), transparent 46%);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; gap: 16px;
  overflow: hidden;
}
.pill-card:hover { border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); transform: translateX(5px); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); }
.pill-card .tag { font-family: var(--font-display); font-weight: 700; font-size: 13px; color: var(--color-accent); width: 34px; height: 34px; flex: none; display: grid; place-items: center; border-radius: 12px; background: linear-gradient(140deg, var(--color-accent-soft), transparent 78%); border: 1px solid var(--glass-border); }
.pill-card .body b { display: block; font-family: var(--font-display); font-size: 17px; color: var(--color-text); }
.pill-card .body span { font-size: 13px; color: var(--color-muted); }

/* ============ 案例卡片 ============ */
.case-card {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  background-image: linear-gradient(180deg, transparent 60%, var(--glow-3));
  display: flex; flex-direction: column; min-height: 260px;
}
.case-card:hover { transform: translateY(-8px); border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); }
.case-card .thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: linear-gradient(135deg, var(--color-surface-2), var(--color-bg-2)); }
.case-card .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform var(--dur-base) var(--ease-out); }
.case-card:hover .thumb img { transform: scale(1.05); }
.case-card .thumb-veil { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 45%, var(--veil)); pointer-events: none; }
.case-card .body { padding: var(--space-4); display: flex; flex-direction: column; gap: 8px; flex: 1; }
.case-card .cat { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--color-accent); font-family: var(--font-display); font-weight: 600; }
.case-card h3 { font-size: 19px; }
.case-card p { font-size: 14px; line-height: 1.6; color: var(--color-muted); }

/* ============ 企业文化 / 价值 ============ */
.value-card {
  position: relative; padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-xl); text-align: left; overflow: hidden;
  background-image: radial-gradient(120% 90% at 88% 0%, var(--glow-accent), transparent 58%);
}
.value-card:hover { transform: translateY(-8px); border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); }
.value-card .v-ic { width: 50px; height: 50px; border-radius: 16px; display: grid; place-items: center; background: linear-gradient(140deg, var(--color-accent-soft), transparent 76%); border: 1px solid var(--glass-border); color: var(--color-accent); margin-bottom: 18px; box-shadow: inset 0 1px 0 var(--glass-inner); }
.value-card .v-ic svg { width: 26px; height: 26px; }
.value-card h3 { margin-bottom: 8px; }
.value-card p { font-size: 14.5px; }

/* 使命 / 理想 双栏 */
.mission-wrap { display: grid; grid-template-columns: 1.2fr 1fr; gap: var(--space-4); }
.mission-card { padding: var(--space-5); border-radius: var(--radius-xl); position: relative; overflow: hidden; background-image: radial-gradient(110% 80% at 0% 100%, var(--glow-1), transparent 60%); }
.mission-card:hover { transform: translateY(-6px); border-color: var(--glass-border-hover); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); }
.mission-card.accent-bg { background: linear-gradient(135deg, var(--color-accent-strong), var(--color-accent) 62%, var(--color-accent-2)); color: var(--color-on-accent); border: none; box-shadow: var(--shadow-2); }
.mission-card.accent-bg h3, .mission-card.accent-bg p { color: var(--color-on-accent); }
.mission-card h3 { font-size: 22px; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; }
.mission-card p { font-size: 16px; }

/* ============ AI 赋能专区（智能渐变 + 神经网络节点）============ */
.ai-section { position: relative; background:
    radial-gradient(60rem 30rem at 78% -10%, var(--glow-accent), transparent 60%),
    radial-gradient(50rem 30rem at 10% 120%, var(--glow-3), transparent 60%),
    linear-gradient(180deg, var(--glow-accent), transparent 30%, var(--glow-3));
  overflow: hidden;
}
/* 神经网络节点背景（装饰，仅桌面）*/
.ai-net { position: absolute; inset: 0; z-index: 0; opacity: .5; pointer-events: none; }
.ai-net .dot { fill: var(--color-accent-2); }
.ai-net .dot.b { fill: var(--color-accent); }
.ai-net .ln { stroke: var(--net-line); stroke-width: 1; }
.ai-section .container { position: relative; z-index: 1; }

/* AI 能力卡（在 service-card 基础上叠加紫色智能描边）*/
.ai-cap { --cap-accent: var(--color-accent-2); }
.ai-cap .ic { background: linear-gradient(135deg, var(--glow-3), var(--glow-accent)); border-color: var(--net-line); color: var(--color-accent-2); }
.ai-cap .idx { color: var(--color-accent-2); }
.ai-cap:hover::before { background: linear-gradient(140deg, var(--net-line), transparent 45%); }
.ai-cap .corner { border-color: var(--color-accent-2); }

/* AI 场景标签 */
.ai-scenarios { display: flex; flex-wrap: wrap; gap: 12px; margin-top: var(--space-5); }
.ai-scenarios .tag {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 18px; border-radius: var(--radius-pill);
  background-image: linear-gradient(100deg, var(--glow-accent), transparent 60%);
  font-size: 14.5px; color: var(--color-text);
}
.ai-scenarios .tag:hover { border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); transform: translateY(-3px); box-shadow: var(--shadow-2), 0 0 24px var(--glow-accent); }
.ai-scenarios .tag::before { content:""; width:8px; height:8px; border-radius:50%; background: var(--grad-ai); box-shadow: 0 0 10px var(--glow-accent); }

/* AI 数据小条 */
.ai-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--glass-border); border: 1px solid var(--glass-border); border-radius: var(--radius-xl); overflow: hidden; margin-top: var(--space-5); box-shadow: var(--shadow-1); backdrop-filter: blur(var(--glass-blur)) saturate(150%); -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%); }
.ai-stats .stat { background-image: linear-gradient(180deg, var(--glow-accent), transparent 74%); }

/* 英雄区智能节点（神经网络点缀）*/
.hero-visual .ai-node { animation: floaty 7s ease-in-out infinite; transform-origin: 50% 50%; }
.hero-visual .ai-node.b { animation-duration: 9s; animation-delay: -2s; }
.hero-visual .node image { filter: drop-shadow(0 0 18px var(--glow-1)); }

/* ============ FAQ 手风琴 ============ */
.faq-list { display: flex; flex-direction: column; gap: 14px; max-width: 880px; }
.faq-item { border-radius: var(--radius-lg); overflow: hidden; }
.faq-item:hover { border-color: var(--glass-border-hover); }
.faq-item.open { border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); }
.faq-q { width: 100%; text-align: left; background: none; border: none; color: var(--color-text); padding: 20px 22px; font-family: var(--font-display); font-size: 17px; font-weight: 600; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.faq-q .pm { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--color-line-strong); display: grid; place-items: center; position: relative; transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base), background var(--dur-base); }
.faq-q .pm::before, .faq-q .pm::after { content:""; position:absolute; background: var(--color-accent); border-radius: 2px; }
.faq-q .pm::before { width: 12px; height: 2px; }
.faq-q .pm::after  { width: 2px; height: 12px; transition: transform var(--dur-base) var(--ease-out); }
.faq-item.open .pm { border-color: var(--color-accent); background: var(--color-accent-soft); }
.faq-item.open .pm::after { transform: scaleY(0); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height var(--dur-slow) var(--ease-out); }
.faq-a .inner { padding: 0 22px 22px; color: var(--color-muted); font-size: 15.5px; line-height: 1.7; }

/* ============ 联系区 ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: stretch; }
.contact-info { display: flex; flex-direction: column; gap: var(--space-3); }
.contact-row { display: flex; align-items: center; gap: 16px; padding: 18px 20px; border-radius: var(--radius-lg); background-image: linear-gradient(100deg, var(--glow-3), transparent 50%); }
.contact-row:hover { border-color: var(--glass-border-hover); background-color: var(--glass-bg-hover); transform: translateX(5px); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner); }
.contact-row .c-ic { width: 46px; height: 46px; flex: none; border-radius: 14px; display: grid; place-items: center; background: linear-gradient(140deg, var(--color-accent-soft), transparent 78%); border: 1px solid var(--glass-border); color: var(--color-accent); box-shadow: inset 0 1px 0 var(--glass-inner); }
.contact-row .c-ic svg { width: 22px; height: 22px; }
.contact-row .c-body b { display: block; font-family: var(--font-display); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--color-muted); margin-bottom: 3px; }
.contact-row .c-body a, .contact-row .c-body span { font-size: 16px; color: var(--color-text); font-weight: 600; }
.contact-card {
  border-radius: var(--radius-xl); padding: var(--space-5);
  background-image: linear-gradient(150deg, var(--glow-1), transparent 55%);
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; justify-content: center; gap: var(--space-3);
}
.contact-card::before { content:""; position:absolute; right:-60px; top:-60px; width:220px; height:220px; border-radius:50%; background: radial-gradient(circle, var(--glow-1), transparent 65%); animation: breathe 7s var(--ease-out) infinite alternate; }
@keyframes breathe { from { transform: scale(1); opacity: .75; } to { transform: scale(1.25); opacity: 1; } }
.contact-card h3 { font-size: 26px; position: relative; }
.contact-card p { position: relative; font-size: 15.5px; }
.contact-card .btn { position: relative; align-self: flex-start; }

/* ---- 金数据嵌入表单 ----
   iframe 内部已用 URL 参数 background=transparent 把白底去掉，
   外层卡片再去掉玻璃底与描边，表单就直接落在页面渐变背景上。
   （注意：iface 内部样式跨域改不了，能控的只有这层容器和 iframe 自身的背景。） */
.contact-card--embed {
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  padding: 0;
  overflow: visible;
}
.contact-card--embed::before,
.contact-card--embed::after { display: none; }
.jsj-embed {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color-scheme: light; /* 表单内部是浅色设计，别被暗色主题的默认控件色影响 */
}
/* 暗色主题的兜底：金数据表单文字固定是深色，透明底会看不清，
   所以单独给 iframe 一层浅色承托，只在暗色下出现。 */
[data-theme="dark"] .jsj-embed {
  background: rgba(255, 255, 255, .95);
  border-radius: var(--radius-lg);
}

/* ============ 页脚 ============ */
.site-footer { border-top: 1px solid var(--color-line); padding-block: var(--space-6) var(--space-4); background: var(--color-bg-2); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: var(--space-4); margin-bottom: var(--space-5); }
.footer-col h4 { font-family: var(--font-display); font-size: 14px; letter-spacing: .12em; text-transform: uppercase; color: var(--color-text); margin-bottom: 16px; }
.footer-col a, .footer-col p { display: block; color: var(--color-muted); font-size: 14.5px; padding: 5px 0; transition: color var(--dur-fast); }
.footer-col a:hover { color: var(--color-accent); }
.footer-col .about { font-size: 14.5px; max-width: 320px; }
/* 页脚品牌：上面 `.footer-col a` 的 display:block 会把 .brand 的横向布局压成上下堆叠，
   导致 logo 与公司名错位。这里提高优先级复位为「图标 + 文字」横向居中排布。 */
.footer-col .brand {
  display: flex; align-items: center; gap: 12px;
  width: fit-content; max-width: 100%; padding: 0; margin-bottom: 16px;
}
.footer-col .brand .brand-text b { font-size: 16px; color: var(--color-text); }
.footer-col .brand .brand-text span { font-size: 10.5px; letter-spacing: .18em; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: var(--space-4); border-top: 1px solid var(--color-line); color: var(--color-faint); font-size: 13px; }

/* ============ 返回顶部（玻璃圆钮）============ */
.back-top {
  position: fixed; right: clamp(16px, 3vw, 32px); bottom: clamp(18px, 4vh, 36px);
  z-index: 40; display: grid; place-items: center;
  width: 48px; height: 48px; border-radius: 50%;
  color: var(--color-accent);
  background-color: var(--glass-bg);
  border: 1px solid var(--color-line-strong);
  box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  opacity: 0; visibility: hidden; transform: translateY(14px) scale(.9);
  transition: opacity var(--dur-base) var(--ease-out), visibility var(--dur-base),
              transform var(--dur-base) var(--ease-spring), background-color var(--dur-fast),
              border-color var(--dur-fast), color var(--dur-fast);
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background-color: var(--glass-bg-hover); border-color: var(--glass-border-hover); transform: translateY(-3px); box-shadow: var(--shadow-2), inset 0 1px 0 var(--glass-inner), 0 0 0 5px var(--glow-1); }
.back-top svg { width: 20px; height: 20px; transition: transform var(--dur-fast) var(--ease-spring); }
.back-top:hover svg { transform: translateY(-2px); }
[data-theme="light"] .back-top { border-color: rgba(12,20,40,.16); }
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .back-top { background-color: var(--color-surface); }
}

/* ============ 自定义光标（仅桌面指针设备）============ */
.cursor-glow { position: fixed; top: 0; left: 0; width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--color-accent); pointer-events: none; z-index: 999; transform: translate(-50%,-50%); mix-blend-mode: var(--cursor-blend, screen); opacity: 0; transition: opacity var(--dur-fast), width .25s var(--ease-out), height .25s var(--ease-out); }
[data-theme="light"] .cursor-glow { mix-blend-mode: normal; }

/* ============ 响应式 ============ */
/* 平板（≤1080）：7 项导航放不下，收成抽屉；英雄区改单列 */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { max-width: 420px; margin-inline: auto; order: -1; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .ai-stats { grid-template-columns: repeat(2,1fr); }
  .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
  .mission-wrap { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-net { display: none; }
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: block; }
  /* 抽屉展开态：必须跟随「汉堡出现」的断点（1080），
     否则 761–1080px 之间点了汉堡没有任何反应 */
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute; top: var(--nav-h); left: 0; right: 0; padding: 16px;
    max-height: calc(100svh - var(--nav-h)); overflow-y: auto;
    /* 实底：玻璃色在亮色主题下会让下层正文透出来，菜单不可读 */
    background: var(--color-bg);
    -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .nav-links.open a { padding: 14px 16px; }
}
/* 手机（≤760）：单列 + 字号收敛 */
@media (max-width: 760px) {
  .nav-cta .btn-sm { display: none; }
  .hero { padding-top: calc(var(--nav-h) + 24px); }
  .hero h1 { font-size: clamp(32px, 9vw, 44px); }
  .hero-lead { font-size: 15.5px; }
  .hero-actions { gap: 10px; margin-bottom: var(--space-5); }
  .btn { min-height: 46px; padding: 0 20px; font-size: 14.5px; }
  .scroll-hint { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-meta { gap: 14px 18px; }
  .hero-meta .item { flex: 1 1 40%; }
  .hero-meta .item b { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 6px; }
}