/* ============================================================
 * 鸿鹄数科 — 企业官网样式
 * 设计契约：深空蓝 #0F172A / 电光蓝 #2563EB / 科技青 #06B6D4
 * 8px 网格 · 毛玻璃卡片 · 低饱和网格纹理 · 克制动效
 * ============================================================ */

/* ---------- 1. Tokens ---------- */
:root {
  --bg-0: #0B1120;
  --bg-1: #0F172A;
  --glass: rgba(30, 41, 59, 0.45);
  --glass-strong: rgba(30, 41, 59, 0.82);
  --line: rgba(148, 163, 184, 0.14);
  --line-hi: rgba(59, 130, 246, 0.45);
  --primary: #2563EB;
  --primary-hi: #3B82F6;
  --cyan: #06B6D4;
  --cyan-hi: #22D3EE;
  --green: #34D399;
  --danger: #F87171;
  --t1: #F1F5F9;
  --t2: #CBD5E1;
  --t3: #94A3B8;
  --t4: #64748B;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei",
    -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --shadow-card: 0 12px 32px rgba(2, 6, 23, 0.45);
  --shadow-glow: 0 12px 40px rgba(37, 99, 235, 0.28);
  --header-h: 76px;
}

/* ---------- 2. Reset / Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-1);
  color: var(--t2);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 全局低透明度网格纹理（不随滚动跳动，fixed 一层） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }

::selection { background: rgba(37, 99, 235, 0.45); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: #293548; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #3b4a63; }

:focus-visible { outline: 2px solid var(--primary-hi); outline-offset: 2px; }

h1, h2, h3, h4 { color: var(--t1); line-height: 1.3; font-weight: 700; }

/* ---------- 3. 布局基元 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section { padding: 104px 0; position: relative; }
.section-alt { background: var(--bg-0); }

.sec-head { margin-bottom: 56px; max-width: 720px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-hi);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--cyan));
  border-radius: 2px;
}
.sec-head.center .eyebrow::after {
  content: "";
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--primary));
  border-radius: 2px;
}

.sec-title {
  font-size: clamp(26px, 3vw, 38px);
  letter-spacing: 0.01em;
  margin-bottom: 16px;
}
.sec-sub { color: var(--t3); font-size: 16px; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.btn .ico { width: 18px; height: 18px; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}
.btn-primary:hover {
  background: var(--primary-hi);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--t1);
  border-color: rgba(148, 163, 184, 0.35);
}
.btn-ghost:hover {
  border-color: var(--cyan-hi);
  color: var(--cyan-hi);
  transform: translateY(-2px);
}

.btn-lg { padding: 14px 30px; font-size: 16px; }

.btn.loading { position: relative; color: transparent; pointer-events: none; }
.btn.loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.ico { width: 20px; height: 20px; flex: none; }

/* ---------- 5. 毛玻璃卡片 ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.glass:hover {
  transform: translateY(-6px);
  border-color: var(--line-hi);
  box-shadow: var(--shadow-glow);
}

/* ---------- 6. 进场动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease var(--d, 0ms), transform 0.6s ease var(--d, 0ms);
  will-change: opacity, transform;
}
[data-reveal].in { opacity: 1; transform: translateY(0); }

/* ---------- 7. 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
  border-bottom: 1px solid transparent;
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-header.scrolled {
  background: rgba(11, 17, 32, 0.72);
  border-bottom-color: var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--t1);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex: none;
}
.logo svg { width: 34px; height: 34px; }
.logo small {
  font-size: 11px;
  font-weight: 400;
  color: var(--t4);
  letter-spacing: 0.12em;
  align-self: flex-end;
  margin-bottom: 3px;
}

.nav-menu { display: flex; align-items: center; gap: 32px; }
.nav-menu a {
  position: relative;
  font-size: 14.5px;
  color: var(--t2);
  padding: 6px 0;
  transition: color 0.2s ease;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--cyan));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav-menu a:hover,
.nav-menu a.active { color: var(--t1); }
.nav-menu a:hover::after,
.nav-menu a.active::after { transform: scaleX(1); }

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

/* 汉堡按钮（≤880 显示） */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--glass);
  color: var(--t1);
  align-items: center;
  justify-content: center;
}

/* ---------- 8. Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 88px) 0 96px;
  background:
    radial-gradient(900px 480px at 82% 8%, rgba(37, 99, 235, 0.16), transparent 62%),
    radial-gradient(700px 420px at 8% 88%, rgba(6, 182, 212, 0.1), transparent 60%),
    var(--bg-1);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  font-size: 13px;
  color: var(--t3);
  margin-bottom: 24px;
}
.hero-eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.9);
}

.hero-title {
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
}
.grad-text {
  background: linear-gradient(92deg, #60A5FA 0%, var(--cyan-hi) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 17px;
  color: var(--t3);
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 56px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}
.stat-num {
  font-size: 30px;
  font-weight: 700;
  color: var(--t1);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.stat-label { font-size: 13px; color: var(--t4); margin-top: 4px; }

/* Hero 右侧粒子舞台 */
.hero-visual {
  position: relative;
  min-height: 440px;
  border-radius: var(--r-lg);
}
#hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.float-card {
  position: absolute;
  z-index: 2;
  padding: 16px 20px;
  border-radius: var(--r-md);
  background: var(--glass-strong);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  animation: floaty 7s ease-in-out infinite;
}
.float-card .fc-title {
  font-size: 12px;
  color: var(--t4);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.float-card .fc-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--t1);
}
.float-card .fc-value em {
  font-style: normal;
  color: var(--green);
  font-size: 13px;
  margin-left: 6px;
}
.fc-1 { top: 14%; right: 4%; animation-delay: 0.4s; }
.fc-2 { bottom: 12%; left: 2%; animation-duration: 8.5s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 9. 四大核心业务 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.service-card { padding: 32px 28px; }
.service-ico {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--cyan-hi);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.18), rgba(6, 182, 212, 0.12));
  border: 1px solid rgba(6, 182, 212, 0.25);
}
.service-ico .ico { width: 26px; height: 26px; }
.service-card h3 { font-size: 18px; margin-bottom: 12px; }
.service-card p { font-size: 14px; color: var(--t3); margin-bottom: 20px; min-height: 72px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--t3);
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.5);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.service-card:hover .tag {
  color: var(--cyan-hi);
  border-color: rgba(6, 182, 212, 0.35);
}

/* ---------- 10. 行业解决方案 ---------- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.solution-card { padding: 28px 24px; position: relative; overflow: hidden; }
.solution-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--cyan));
  opacity: 0;
  transition: opacity 0.25s ease;
}
.solution-card:hover::before { opacity: 1; }
.solution-card h3 { font-size: 17px; margin-bottom: 10px; }
.solution-card p { font-size: 13.5px; color: var(--t3); margin-bottom: 16px; }
.solution-card .sol-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--cyan-hi);
}
.solution-card .sol-link .ico { width: 15px; height: 15px; transition: transform 0.2s ease; }
.solution-card:hover .sol-link .ico { transform: translate(2px, -2px); }

/* ---------- 11. 技术栈 ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
.tech-group {
  padding: 24px 16px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: border-color 0.25s ease;
}
.tech-group:hover { border-color: var(--line-hi); }
.tech-group-name {
  font-size: 14px;
  color: var(--t2);
  text-align: center;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.tech-row { display: flex; flex-direction: column; gap: 6px; }
.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 4px;
  border-radius: var(--r-sm);
  transition: background 0.2s ease;
}
.tech-item:hover { background: rgba(37, 99, 235, 0.08); }
.tech-item img {
  width: 38px;
  height: 38px;
  filter: grayscale(1) opacity(0.55);
  transition: filter 0.25s ease, transform 0.25s ease;
}
.tech-item:hover img { filter: none; transform: scale(1.06); }
.tech-item span { font-size: 12px; color: var(--t4); }
.tech-item:hover span { color: var(--t2); }

/* ---------- 12. 服务流程 ---------- */
.process-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
/* 串联线：穿过步骤圆心 */
.process-track::before {
  content: "";
  position: absolute;
  top: 27px;
  left: 6%;
  right: 6%;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.5), rgba(6, 182, 212, 0.5),
    rgba(6, 182, 212, 0.1));
}
.p-step { text-align: center; position: relative; }
.p-num {
  width: 54px;
  height: 54px;
  margin: 0 auto 18px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan-hi);
  background: var(--bg-1);
  border: 1px solid var(--line);
  box-shadow: 0 0 0 6px var(--bg-1); /* 遮住穿过圆心的线 */
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.p-step:hover .p-num {
  border-color: var(--cyan);
  box-shadow: 0 0 0 6px var(--bg-1), 0 0 24px rgba(6, 182, 212, 0.25);
}
.p-step h3 { font-size: 16px; margin-bottom: 8px; }
.p-step p { font-size: 13px; color: var(--t3); }

/* ---------- 13. 精选案例 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}
.filter-btn {
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--t3);
  background: transparent;
  border: 1px solid var(--line);
  transition: all 0.2s ease;
}
.filter-btn:hover { color: var(--t1); border-color: rgba(148, 163, 184, 0.4); }
.filter-btn.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  cursor: pointer;
  animation: cardIn 0.5s ease var(--d, 0ms) both;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.case-card:hover {
  transform: translateY(-6px);
  border-color: var(--line-hi);
  box-shadow: var(--shadow-glow);
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.case-cover { position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.case-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.case-card:hover .case-cover img { transform: scale(1.05); }
/* 右下角几何切割 */
.case-cover::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 24px solid transparent;
  border-bottom: 24px solid var(--bg-1);
}
.case-mask {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 16px;
  background: linear-gradient(180deg, rgba(11, 17, 32, 0) 40%, rgba(11, 17, 32, 0.88));
  opacity: 0;
  transition: opacity 0.25s ease;
}
.case-card:hover .case-mask { opacity: 1; }
.case-mask span {
  font-size: 13px;
  color: var(--cyan-hi);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.case-body { padding: 22px 24px 26px; }
.case-type {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-hi);
  letter-spacing: 0.1em;
}
.case-title { font-size: 17px; margin: 10px 0 8px; }
.case-desc {
  font-size: 13.5px;
  color: var(--t3);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.case-tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--t3);
  border: 1px solid var(--line);
}

/* ---------- 14. 关于我们 / 核心优势 ---------- */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-card { padding: 30px 26px; }
.adv-ico {
  width: 46px;
  height: 46px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-hi);
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
}
.adv-card h3 { font-size: 17px; margin-bottom: 10px; }
.adv-card p { font-size: 13.5px; color: var(--t3); }

/* ---------- 15. 合作客户 ---------- */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.client-logo {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  color: var(--t4);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.05em;
  filter: grayscale(1);
  opacity: 0.65;
  transition: all 0.25s ease;
  white-space: nowrap;
  overflow: hidden;
}
.client-logo:hover {
  color: var(--t1);
  border-color: rgba(59, 130, 246, 0.4);
  filter: none;
  opacity: 1;
}
.clients-note {
  margin-top: 24px;
  text-align: center;
  font-size: 12.5px;
  color: var(--t4);
}

/* ---------- 16. 底部转化 / 表单 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: start;
}
.lead-form { padding: 32px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field { margin-bottom: 20px; }
.form-field label {
  display: block;
  font-size: 13.5px;
  color: var(--t2);
  margin-bottom: 8px;
}
.form-field label em { font-style: normal; color: var(--danger); margin-left: 2px; }
.form-field input,
.form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(11, 17, 32, 0.6);
  color: var(--t1);
  font-size: 14.5px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--t4); }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--primary-hi);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.22);
}
.form-field textarea { min-height: 112px; resize: vertical; }
.form-field .err-msg {
  display: none;
  font-size: 12.5px;
  color: var(--danger);
  margin-top: 6px;
}
.form-field.has-err input {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.15);
}
.form-field.has-err .err-msg { display: block; }
.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 4px;
}
.form-foot .privacy-tip { font-size: 12px; color: var(--t4); max-width: 280px; }

.contact-side { display: flex; flex-direction: column; gap: 24px; }
.contact-card { padding: 28px; }
.c-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 0;
}
.c-row + .c-row { border-top: 1px solid var(--line); }
.c-row .ico { color: var(--cyan-hi); margin-top: 3px; }
.c-row .c-label { font-size: 12.5px; color: var(--t4); margin-bottom: 2px; }
.c-row .c-value { font-size: 15px; color: var(--t1); font-weight: 600; }

.qr-card { padding: 24px; display: flex; align-items: center; gap: 20px; }
.qr-card svg, .qr-card img { width: 108px; height: 108px; flex: none; border-radius: 8px; display: block; }
.qr-card .qr-text h4 { font-size: 15px; margin-bottom: 6px; }
.qr-card .qr-text p { font-size: 12.5px; color: var(--t4); }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(2, 6, 23, 0.55);
  padding-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand p { font-size: 13.5px; color: var(--t4); margin-top: 16px; max-width: 320px; }
.footer-col h4 {
  font-size: 14px;
  color: var(--t1);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}
.footer-col a {
  display: block;
  font-size: 13.5px;
  color: var(--t4);
  padding: 5px 0;
  transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--cyan-hi); }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 12.5px;
  color: var(--t4);
}
.footer-bottom a,
.footer-bottom button {
  color: var(--t4);
  font-size: 12.5px;
  background: none;
  border: none;
  padding: 0;
  transition: color 0.2s ease;
}
.footer-bottom a:hover,
.footer-bottom button:hover { color: var(--t2); }
.footer-links { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-links .sep { color: rgba(100, 116, 139, 0.5); }

/* 行内文字按钮（隐私政策 / 用户协议） */
.link-btn {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  color: var(--t4);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}
.link-btn:hover { color: var(--cyan-hi); }

/* ---------- 18. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--glass-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--t2);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { color: var(--cyan-hi); border-color: var(--cyan); }

/* ---------- 19. 模态 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(2, 6, 23, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal.open { opacity: 1; visibility: visible; }
.modal-box {
  width: 100%;
  max-width: 680px;
  max-height: 84vh;
  overflow-y: auto;
  background: var(--glass-strong);
  border: 1px solid var(--line-hi);
  border-radius: var(--r-lg);
  padding: 32px;
  position: relative;
  transform: translateY(16px);
  transition: transform 0.25s ease;
  box-shadow: 0 24px 64px rgba(2, 6, 23, 0.6);
}
.modal.open .modal-box { transform: translateY(0); }
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--t3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.modal-close:hover { color: var(--t1); border-color: var(--t3); }
.modal-box h3 { font-size: 20px; margin-bottom: 16px; padding-right: 40px; }
.modal-box p { font-size: 14px; color: var(--t2); margin-bottom: 12px; }
.modal-muted { color: var(--t4) !important; font-size: 12.5px !important; }

/* 案例详情模态 */
.case-detail-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-md);
  margin-bottom: 24px;
}
.case-detail-body .case-type { font-size: 12.5px; }
.case-detail-body h3 { margin: 10px 0 12px; }
.case-detail-body > p { margin-bottom: 16px; }
.case-detail-body .case-tags { margin-bottom: 24px; }
.case-detail-body .btn { margin-top: 4px; }

/* ---------- 20. Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 36px;
  z-index: 300;
  transform: translate(-50%, 16px);
  padding: 12px 22px;
  border-radius: var(--r-md);
  background: var(--glass-strong);
  border: 1px solid rgba(52, 211, 153, 0.4);
  color: var(--t1);
  font-size: 14px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.toast.show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.toast.toast-err { border-color: rgba(248, 113, 113, 0.5); }

/* ---------- 21. 响应式 ---------- */
@media (max-width: 1240px) {
  .container { padding: 0 20px; }
  .services-grid, .adv-grid, .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .clients-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 1024px) {
  .section { padding: 80px 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { min-height: 340px; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 99;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(11, 17, 32, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 16px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
  }
  .nav-menu.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-menu a { padding: 13px 4px; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav-menu a::after { display: none; }
  .nav-menu a.active { color: var(--cyan-hi); }

  .process-track { grid-template-columns: 1fr; gap: 32px; }
  .process-track::before {
    top: 4%;
    bottom: 4%;
    left: 26px;
    right: auto;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg,
      rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.5), rgba(6, 182, 212, 0.5),
      rgba(6, 182, 212, 0.1));
  }
  .p-step { text-align: left; display: flex; gap: 18px; align-items: flex-start; }
  .p-num { margin: 0; flex: none; box-shadow: 0 0 0 6px var(--bg-1); }
  .p-step:hover .p-num { box-shadow: 0 0 0 6px var(--bg-1); }
}

@media (max-width: 600px) {
  .section { padding: 64px 0; }
  .hero { padding-top: calc(var(--header-h) + 56px); }
  .hero-cta .btn { flex: 1; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px 12px; }
  .services-grid, .adv-grid, .solutions-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .clients-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .lead-form { padding: 24px 20px; }
  .form-foot { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .float-card { padding: 12px 14px; }
  .float-card .fc-value { font-size: 16px; }
  .modal-box { padding: 24px 20px; }
}

/* ---------- 22. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .float-card { animation: none; }
}