/* ============================================================
   壹玖科技官网 — 复古未来主题 Retro-Futuristic
   方向：深空蓝黑 60% / 面板蓝 30% / 电光青 10%
   展示字：Chakra Petch（拉丁）+ 系统中文黑体；数据：JetBrains Mono
   记忆点：等宽编号体系 · CRT 网格氛围 · 关键词跑马灯
   ============================================================ */

/* ===== Design Tokens ===== */
:root {
  /* 颜色（语义令牌） */
  --color-bg: #060b16;            /* 深空底 */
  --color-bg-deep: #04070f;
  --color-surface: #0b1526;       /* 面板 */
  --color-surface-2: #101d33;     /* 面板悬停/次层 */
  --color-line: rgba(148, 184, 226, .14);   /* 发丝线 */
  --color-line-strong: rgba(148, 184, 226, .26);
  --color-text: #eaf1fb;
  --color-muted: #93a3bc;
  --color-accent: #2fd8ff;        /* 电光青 — 只给关键动作与数据 */
  --color-accent-dim: rgba(47, 216, 255, .12);
  --color-ok: #34d399;
  --color-err: #f87171;
  --color-on-accent: #04121f;     /* 强调色上的文字 */

  /* 字体 */
  --font-display: "Chakra Petch", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  /* 字阶（1.25 模块化） */
  --text-xs: .75rem;
  --text-sm: .84rem;
  --text-base: .97rem;
  --text-lg: 1.13rem;
  --text-xl: 1.4rem;
  --text-2xl: 1.75rem;
  --text-3xl: clamp(1.9rem, 3.2vw, 2.6rem);
  --text-hero: clamp(2.5rem, 6vw, 4.5rem);

  /* 间距（4 基数梯度） */
  --space-1: 4px; --space-2: 8px; --space-3: 16px; --space-4: 24px;
  --space-5: 40px; --space-6: 64px; --space-7: 96px;

  /* 圆角 / 阴影（3 级，Y 2/8/24） */
  --radius-sm: 6px; --radius-md: 12px; --radius-lg: 18px;
  --shadow-1: 0 2px 8px rgba(2, 6, 16, .4);
  --shadow-2: 0 8px 28px rgba(2, 6, 16, .5);
  --shadow-3: 0 24px 64px rgba(2, 6, 16, .6);
  --glow: 0 0 0 1px rgba(47, 216, 255, .35), 0 0 24px rgba(47, 216, 255, .18);

  /* 动效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms; --dur-base: 320ms; --dur-slow: 640ms;

  --maxw: 1160px;
}

/* ===== 基础 ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 氛围层：渐变网格 + CRT 网格 + 噪点 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(58rem 40rem at 88% -8%, rgba(47, 216, 255, .07), transparent 60%),
    radial-gradient(50rem 42rem at -10% 30%, rgba(37, 99, 235, .08), transparent 55%);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(148, 184, 226, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 184, 226, .045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(#000 60%, transparent);
  -webkit-mask-image: linear-gradient(#000 60%, transparent);
}
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: .04;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

main, section, header, footer { position: relative; z-index: 2; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
::selection { background: rgba(47, 216, 255, .28); }

/* 焦点可见性 */
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 4px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: var(--radius-sm); font-weight: 600;
  font-size: var(--text-base); font-family: var(--font-display); letter-spacing: .04em;
  cursor: pointer; border: 1px solid transparent;
  transition: transform var(--dur-fast) ease-out, box-shadow var(--dur-base) var(--ease-out),
              background-color var(--dur-fast) ease-out, border-color var(--dur-fast);
  min-height: 44px;
}
.btn .arrow { display: inline-block; transition: transform var(--dur-fast) ease-out; }
.btn:hover .arrow { transform: translateX(4px); }
.btn-primary {
  background: var(--color-accent); color: var(--color-on-accent);
  box-shadow: 0 0 0 1px rgba(47, 216, 255, .4), 0 8px 24px rgba(47, 216, 255, .22);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(47, 216, 255, .6), 0 12px 32px rgba(47, 216, 255, .32); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  background: rgba(234, 241, 251, .06); color: var(--color-text);
  border-color: var(--color-line-strong); backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(234, 241, 251, .12); border-color: var(--color-accent); transform: translateY(-2px); }

/* ===== 顶部导航 ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent; transition: background var(--dur-base), box-shadow var(--dur-base), border-color var(--dur-base);
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: rgba(6, 11, 22, .82); backdrop-filter: blur(12px);
  border-bottom-color: var(--color-line); box-shadow: var(--shadow-1);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { height: 34px; width: auto; object-fit: contain; transition: transform var(--dur-fast) ease-out; }
.brand:hover .brand-logo { transform: scale(1.04); }

.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links > a, .nav-drop-btn {
  position: relative; color: rgba(234, 241, 251, .88); font-weight: 500; font-size: var(--text-base);
  background: none; border: 0; cursor: pointer; font-family: inherit; min-height: 44px;
  display: inline-flex; align-items: center;
}
.nav-links > a::after, .nav-drop-btn::after {
  content: ""; position: absolute; left: 0; bottom: 6px; width: 100%; height: 1px;
  background: var(--color-accent); transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.nav-links > a:hover::after, .nav-drop-btn:hover::after { transform: scaleX(1); }
.nav-links > a:hover, .nav-drop-btn:hover { color: var(--color-accent); }
.nav-links > .nav-cta {
  color: var(--color-on-accent) !important;
  padding: 0 18px;
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.nav-links > .nav-cta::after { display: none; }
.nav-links > .nav-cta:hover { color: var(--color-on-accent) !important; background: #6ce4ff; }

/* AI 产品下拉 */
.nav-dropdown { position: relative; }
.nav-drop-btn { gap: 5px; }
.caret { font-size: 10px; transition: transform var(--dur-base) var(--ease-out); }
.nav-dropdown.open .caret { transform: rotate(180deg); }
.drop-menu {
  position: absolute; top: calc(100% + 16px); right: 0; min-width: 250px;
  background: var(--color-surface); border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md); box-shadow: var(--shadow-3); padding: 8px;
  display: grid; gap: 2px;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.nav-dropdown.open .drop-menu { opacity: 1; pointer-events: auto; transform: none; }
/* 桌面端：悬浮展开下拉 */
@media (hover: hover) and (pointer: fine) and (min-width: 921px) {
  .nav-dropdown:hover > .drop-menu,
  .nav-dropdown:focus-within > .drop-menu {
    opacity: 1; pointer-events: auto; transform: none;
  }
  .nav-dropdown:hover .caret,
  .nav-dropdown:focus-within .caret { transform: rotate(180deg); }
}
.drop-menu::before { content: ""; position: absolute; top: -16px; left: 0; right: 0; height: 16px; }
.drop-menu a {
  display: flex; flex-direction: column; gap: 2px; padding: 10px 12px;
  border-radius: var(--radius-sm); color: var(--color-text);
  border-left: 2px solid transparent; transition: background var(--dur-fast), border-color var(--dur-fast);
}
.drop-menu a:hover { background: var(--color-surface-2); border-left-color: var(--color-accent); }
.drop-menu a strong { font-size: var(--text-base); font-family: var(--font-display); }
.drop-menu a span { font-size: var(--text-xs); color: var(--color-muted); }

/* 移动端开关 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 10px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: var(--dur-fast); }

/* ===== Hero ===== */
.hero { position: relative; padding: 150px 0 90px; color: var(--color-text); overflow: hidden; }
.hero-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0; pointer-events: none;
  background: linear-gradient(160deg, var(--color-bg-deep), var(--color-surface));
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(47, 216, 255, .12), transparent 60%),
    linear-gradient(100deg, rgba(4, 7, 15, .9) 0%, rgba(4, 7, 15, .66) 45%, rgba(4, 7, 15, .4) 100%);
}
/* CRT 扫描线（微妙） */
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none; opacity: .35;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 4px);
}
.hero-inner { position: relative; z-index: 2; }
.hero-content { max-width: 800px; }

/* 入场编排：badge → h1 → lead → actions → stats，间隔 80ms */
@keyframes heroUp { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
.hero-content > * { animation: heroUp var(--dur-slow) var(--ease-out) both; }
.hero-content > .badge { animation-delay: 0ms; }
.hero-content > h1 { animation-delay: 80ms; }
.hero-content > .lead { animation-delay: 160ms; }
.hero-content > .hero-actions { animation-delay: 240ms; }
.hero-content > .hero-stats { animation-delay: 320ms; }

.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px;
  border-radius: 999px; font-size: var(--text-xs); font-weight: 600; font-family: var(--font-mono);
  letter-spacing: .12em; color: var(--color-accent);
  background: rgba(47, 216, 255, .08); border: 1px solid rgba(47, 216, 255, .3);
  margin-bottom: var(--space-4);
}
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 8px var(--color-accent); }

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-hero); line-height: 1.06; font-weight: 700; letter-spacing: -.02em;
}
.hero h1 em { font-style: normal; color: var(--color-accent); text-shadow: 0 0 32px rgba(47, 216, 255, .45); }
.lead { margin: var(--space-4) 0 var(--space-5); font-size: var(--text-lg); color: rgba(234, 241, 251, .82); max-width: 620px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 48px; margin-top: var(--space-6); flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; gap: 2px; }
.hero-stats strong {
  font-family: var(--font-mono); font-size: clamp(1.6rem, 3vw, 2rem); font-weight: 700;
  font-variant-numeric: tabular-nums; color: var(--color-text); line-height: 1.1;
}
.hero-stats span { font-size: var(--text-xs); color: var(--color-muted); letter-spacing: .08em; }

/* ===== 跑马灯 ===== */
.ticker {
  position: relative; z-index: 2; overflow: hidden; border-block: 1px solid var(--color-line);
  background: var(--color-bg-deep); padding: 14px 0;
}
.ticker-track {
  display: inline-flex; align-items: center; gap: 28px; white-space: nowrap;
  width: max-content; animation: ticker 36s linear infinite;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-track span { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: .18em; color: var(--color-muted); }
.ticker-track i { font-style: normal; font-size: 8px; color: var(--color-accent); opacity: .7; }
@keyframes ticker { to { transform: translateX(-50%); } }

/* ===== 通用 section ===== */
.section { padding: var(--space-7) 0; }
.section-alt { background: linear-gradient(180deg, rgba(16, 29, 51, .35), rgba(6, 11, 22, 0)); }
.section-head { max-width: 780px; margin: 0 auto 52px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .3em; color: var(--color-accent); margin-bottom: var(--space-3);
}
.eyebrow::before, .eyebrow::after { content: "//"; color: var(--color-line-strong); }
.section-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-3xl); font-weight: 700; color: var(--color-text); letter-spacing: -.02em; line-height: 1.15;
}
.section-head p { margin-top: var(--space-3); color: var(--color-muted); font-size: var(--text-base); max-width: 640px; margin-inline: auto; }

/* 滚动进场 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.reveal.visible { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: 80ms; }
.reveal:nth-child(3) { transition-delay: 160ms; }
.reveal:nth-child(4) { transition-delay: 240ms; }

/* 四角括号装饰（复古未来标志） */
.corners { position: relative; }
.corners::before, .corners::after {
  content: ""; position: absolute; width: 14px; height: 14px; pointer-events: none;
  transition: border-color var(--dur-base), width var(--dur-base) var(--ease-out), height var(--dur-base) var(--ease-out);
}
.corners::before { top: -1px; left: -1px; border-top: 2px solid var(--color-line-strong); border-left: 2px solid var(--color-line-strong); }
.corners::after { bottom: -1px; right: -1px; border-bottom: 2px solid var(--color-line-strong); border-right: 2px solid var(--color-line-strong); }
.corners:hover::before, .corners:hover::after,
.corners.lit::before, .corners.lit::after {
  width: 26px; height: 26px; border-color: var(--color-accent);
}

/* ===== 关于我们 ===== */
.about-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
.about-card {
  position: relative; background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: var(--space-4);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base), box-shadow var(--dur-base);
}
.about-card:hover { transform: translateY(-6px); border-color: var(--color-line-strong); box-shadow: var(--shadow-2); }
.about-icon {
  font-size: 22px; width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: var(--space-3);
  background: var(--color-accent-dim); border: 1px solid rgba(47, 216, 255, .25); border-radius: var(--radius-sm);
}
.about-card h3 { font-size: var(--text-lg); color: var(--color-text); margin-bottom: var(--space-2); font-family: var(--font-display); }
.about-card p { color: var(--color-muted); font-size: var(--text-sm); }

/* ===== 业务详情 ===== */
.service-tabs { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: var(--space-5); }
.tab {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: var(--radius-sm); border: 1px solid var(--color-line);
  background: rgba(11, 21, 38, .6); font-size: var(--text-base); font-weight: 600;
  color: var(--color-muted); cursor: pointer; min-height: 44px; font-family: inherit;
  transition: all var(--dur-fast) ease-out;
}
.tab i { font-style: normal; font-family: var(--font-mono); font-size: var(--text-xs); opacity: .6; }
.tab:hover { border-color: rgba(47, 216, 255, .5); color: var(--color-text); transform: translateY(-2px); letter-spacing: .02em; }
.tab.active {
  background: var(--color-accent); color: var(--color-on-accent); border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(47, 216, 255, .4), 0 8px 24px rgba(47, 216, 255, .22);
}
.tab.active i { opacity: .85; }

.service-panel {
  display: none; background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius-lg); padding: var(--space-5); box-shadow: var(--shadow-2);
  position: relative; overflow: hidden;
}
.service-panel::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(40rem 18rem at 100% 0%, rgba(47, 216, 255, .06), transparent 60%);
}
.service-panel.active { display: block; animation: fade var(--dur-base) var(--ease-out); }
@keyframes fade { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.service-header {
  display: flex; align-items: baseline; gap: var(--space-3);
  margin-bottom: var(--space-4); padding-bottom: var(--space-4);
  border-bottom: 1px dashed var(--color-line-strong); position: relative;
}
.svc-index {
  font-family: var(--font-mono); font-size: clamp(2.2rem, 4vw, 3.2rem); font-weight: 700;
  line-height: 1; color: transparent; -webkit-text-stroke: 1.5px rgba(47, 216, 255, .55);
  font-variant-numeric: tabular-nums; flex: 0 0 auto; transform: translateY(4px);
}
.service-header h3 { font-size: var(--text-2xl); color: var(--color-text); font-family: var(--font-display); letter-spacing: -.01em; }
.service-header p { color: var(--color-muted); margin-top: 6px; font-size: var(--text-base); }
.service-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); position: relative; }
.svc-col {
  background: rgba(6, 11, 22, .45); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: var(--space-4);
  transition: border-color var(--dur-base), transform var(--dur-base) var(--ease-out);
}
.svc-col:hover { border-color: rgba(47, 216, 255, .4); transform: translateY(-3px); }
.svc-col h4 {
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .25em; color: var(--color-accent); margin-bottom: var(--space-3);
  padding-bottom: 10px; border-bottom: 1px solid var(--color-line);
}
.svc-col ul { list-style: none; }
.svc-col li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--color-text); font-size: var(--text-sm); }
.svc-col li::before { content: "▸"; position: absolute; left: 0; top: 0; color: var(--color-accent); }

/* ===== 服务流程 ===== */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
.process-step {
  position: relative; background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: var(--space-4);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base), box-shadow var(--dur-base);
}
.process-step:hover { transform: translateY(-6px); border-color: var(--color-line-strong); box-shadow: var(--shadow-2); }
.step-num {
  display: inline-grid; place-items: center; min-width: 46px; height: 46px; padding: 0 10px;
  border-radius: var(--radius-sm); background: var(--color-accent-dim);
  border: 1px solid rgba(47, 216, 255, .3);
  color: var(--color-accent); font-family: var(--font-mono); font-weight: 700; font-size: var(--text-lg);
  margin-bottom: var(--space-3); font-variant-numeric: tabular-nums;
}
.process-step h3 { font-size: var(--text-lg); color: var(--color-text); margin-bottom: var(--space-2); font-family: var(--font-display); }
.process-step p { color: var(--color-muted); font-size: var(--text-sm); }
/* 步骤连接线 */
.process-step:not(:last-child)::after {
  content: ""; position: absolute; top: 46px; right: -13px; width: 13px; height: 1px;
  background: repeating-linear-gradient(90deg, var(--color-line-strong) 0 3px, transparent 3px 6px);
}

/* ===== 常见问题 ===== */
.faq-list { max-width: 780px; margin: 0 auto; display: grid; gap: var(--space-2); }
.faq-item {
  background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: 0 var(--space-4);
  transition: border-color var(--dur-base), box-shadow var(--dur-base);
}
.faq-item:hover { border-color: var(--color-line-strong); }
.faq-item[open] { border-color: rgba(47, 216, 255, .4); box-shadow: var(--glow); }
.faq-item summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; gap: var(--space-3); padding: 18px 0; min-height: 44px;
  font-weight: 600; color: var(--color-text); font-size: var(--text-base);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-arrow { font-family: var(--font-mono); color: var(--color-accent); font-weight: 600; transition: transform var(--dur-base) var(--ease-out); flex: 0 0 auto; }
.faq-item[open] .faq-arrow { transform: rotate(45deg); }
.faq-body { padding: 0 0 18px; color: var(--color-muted); font-size: var(--text-sm); animation: fade var(--dur-base) var(--ease-out); }

/* ===== 联系方式 + 表单 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: var(--space-6); align-items: start; }
.contact-info h2 { font-size: var(--text-2xl); color: var(--color-text); font-family: var(--font-display); margin-top: var(--space-2); }
.contact-sub { color: var(--color-muted); margin: var(--space-3) 0 var(--space-4); font-size: var(--text-base); }
.contact-list { list-style: none; display: grid; gap: var(--space-3); }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; }
.ci-ico {
  font-size: 18px; width: 44px; height: 44px; display: grid; place-items: center;
  background: var(--color-accent-dim); border: 1px solid rgba(47, 216, 255, .25);
  border-radius: var(--radius-sm); flex: 0 0 auto;
}
.contact-list strong { display: block; color: var(--color-text); font-size: var(--text-sm); font-family: var(--font-display); }
.contact-list span { color: var(--color-muted); font-size: var(--text-sm); }

.contact-form {
  background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius-lg); padding: var(--space-5); box-shadow: var(--shadow-2);
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3);
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: var(--text-xs); font-weight: 600; color: var(--color-muted); font-family: var(--font-mono); letter-spacing: .12em; }
.field input, .field select, .field textarea {
  padding: 12px 14px; border: 1px solid var(--color-line-strong); border-radius: var(--radius-sm);
  font-size: var(--text-base); font-family: inherit; color: var(--color-text);
  background: rgba(4, 7, 15, .5); transition: border-color var(--dur-fast), box-shadow var(--dur-fast); min-height: 44px;
}
.field input::placeholder, .field textarea::placeholder { color: rgba(147, 163, 188, .55); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(47, 216, 255, .15);
}
.field textarea { resize: vertical; min-height: 0; }
.form-actions { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.form-note { font-size: var(--text-sm); color: var(--color-ok); font-weight: 600; }
.form-note.error { color: var(--color-err); }
.hp-field { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }

/* ===== 跳转链接（无障碍/SEO） ===== */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 400;
  padding: 10px 18px; background: var(--color-accent); color: var(--color-on-accent);
  border-radius: 0 0 var(--radius-sm) 0; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ===== 咨询弹窗 ===== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(3, 7, 15, .74); backdrop-filter: blur(8px);
  display: grid; place-items: center; padding: var(--space-4);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal {
  position: relative; width: min(600px, 100%);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  /* 隐藏滚动条：内容超限时仍可滚动（触控板/滚轮），但视觉上无滚动条 */
  scrollbar-width: none; -ms-overflow-style: none;
  background: var(--color-surface); border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-3), 0 0 60px rgba(47, 216, 255, .08);
  padding: var(--space-5);
  transform: translateY(20px) scale(.97);
  transition: transform var(--dur-base) var(--ease-out);
}
.modal::-webkit-scrollbar { display: none; width: 0; height: 0; }
.modal-overlay.open .modal { transform: none; }
.modal-close {
  position: absolute; top: 14px; right: 14px; width: 36px; height: 36px;
  display: grid; place-items: center; font-size: 15px; cursor: pointer;
  color: var(--color-muted); background: rgba(234, 241, 251, .05);
  border: 1px solid var(--color-line); border-radius: var(--radius-sm);
  transition: color var(--dur-fast), background var(--dur-fast), border-color var(--dur-fast);
}
.modal-close:hover { color: var(--color-text); background: rgba(234, 241, 251, .1); border-color: var(--color-accent); }
.modal-head { margin-bottom: var(--space-3); }
.modal-head h3 { font-size: var(--text-2xl); font-family: var(--font-display); color: var(--color-text); margin: 6px 0; }
.modal-head p { color: var(--color-muted); font-size: var(--text-sm); }
.modal-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
/* 弹窗内字段紧凑化：常规桌面高度下一屏完整呈现，不出现滚动条 */
.modal .field { gap: 5px; }
.modal .field input, .modal .field select, .modal .field textarea {
  padding: 9px 12px; min-height: 38px; font-size: var(--text-sm);
}
.modal .field textarea { min-height: 0; }
.modal .form-actions { gap: var(--space-2); }
.modal-success { text-align: center; padding: var(--space-6) 0 var(--space-4); }
.success-ico {
  display: inline-grid; place-items: center; width: 64px; height: 64px; margin-bottom: var(--space-3);
  font-size: 28px; color: var(--color-ok);
  background: rgba(52, 211, 153, .1); border: 1px solid rgba(52, 211, 153, .4);
  border-radius: 50%; box-shadow: 0 0 32px rgba(52, 211, 153, .25);
}
.modal-success h4 { font-size: var(--text-xl); font-family: var(--font-display); color: var(--color-text); margin-bottom: 6px; }
.modal-success p { color: var(--color-muted); font-size: var(--text-sm); }

@media (max-width: 680px) {
  .modal { padding: var(--space-4); }
  .modal-form { grid-template-columns: 1fr; gap: 10px; }
}

/* ===== 页脚 ===== */
.footer { background: var(--color-bg-deep); border-top: 1px solid var(--color-line); color: var(--color-muted); padding-top: var(--space-6); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--space-5); padding-bottom: var(--space-5); }
.footer-brand { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-logo { height: 32px; width: auto; object-fit: contain; }
.footer-brand p { font-size: var(--text-sm); color: var(--color-muted); }
.footer-col h4 {
  color: var(--color-text); font-size: var(--text-sm); margin-bottom: var(--space-3);
  font-family: var(--font-mono); letter-spacing: .2em; font-weight: 600;
}
.footer-nav { display: flex; flex-direction: column; gap: 9px; }
.footer-nav a { color: var(--color-muted); font-size: var(--text-sm); transition: color var(--dur-fast), padding-left var(--dur-fast); }
.footer-nav a:hover { color: var(--color-accent); padding-left: 4px; }
.footer-bottom { border-top: 1px solid var(--color-line); padding: 18px 0; font-size: var(--text-xs); color: var(--color-muted); text-align: center; }
.icp { color: var(--color-muted); margin-left: 10px; transition: color var(--dur-fast); }
.icp:hover { color: var(--color-accent); }

/* ===== 回到顶部 ===== */
.back-top {
  position: fixed; right: 24px; bottom: 88px; z-index: 90; width: 44px; height: 44px;
  border-radius: var(--radius-sm); border: 1px solid rgba(47, 216, 255, .35); cursor: pointer;
  color: var(--color-accent); font-size: 18px; background: rgba(6, 11, 22, .8); backdrop-filter: blur(8px);
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), box-shadow var(--dur-fast);
}
.back-top.show { opacity: 1; pointer-events: auto; transform: none; }
.back-top:hover { box-shadow: var(--glow); transform: translateY(-3px); }

/* ===== 降级动效 ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-content > * { animation: none; }
  .ticker-track { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ===== 响应式 ===== */
@media (max-width: 920px) {
  .about-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step:not(:last-child)::after { display: none; }
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .service-cols { grid-template-columns: 1fr; gap: var(--space-3); }
  .service-panel { padding: var(--space-4); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .hero-stats { gap: var(--space-4); }
}

@media (max-width: 680px) {
  .nav-links {
    position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--color-surface); border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-3); padding: 10px 20px 20px;
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: var(--dur-base);
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links > a, .nav-drop-btn { color: var(--color-text); padding: 13px 4px; min-height: 44px; border-bottom: 1px solid var(--color-line); width: 100%; justify-content: space-between; }
  .nav-links > a::after, .nav-drop-btn::after { display: none; }
  .nav-links .nav-cta { margin-top: var(--space-3); text-align: center; justify-content: center; border-bottom: 0; }
  .nav-dropdown { border-bottom: 1px solid var(--color-line); }
  .drop-menu {
    position: static; min-width: 0; border: 0; box-shadow: none; border-radius: 0; padding: 0 0 6px;
    opacity: 1; pointer-events: auto; transform: none; display: none; background: transparent;
  }
  .nav-dropdown.open .drop-menu { display: grid; }
  .drop-menu a { padding: 10px 4px 10px 14px; border-bottom: 1px dashed var(--color-line); border-radius: 0; }
  .drop-menu a:last-child { border-bottom: 0; }
  .drop-menu::before { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding: 124px 0 70px; }
  .about-grid, .process-grid { grid-template-columns: 1fr; }
  .contact-form { grid-template-columns: 1fr; padding: var(--space-4); }
  .service-tabs { gap: 8px; }
  .tab { padding: 10px 14px; font-size: var(--text-sm); }
  .section { padding: var(--space-6) 0; }
  .footer-inner { grid-template-columns: 1fr; }
  .hero-stats { gap: var(--space-4); }
}