/* ============================================================
   天津德俊网络科技有限公司官网 · 全站样式
   设计令牌与视觉规范对应 Ardot 设计稿《德俊科技-官网设计》
   兼容：主流浏览器 + 微信内置浏览器（XWeb 内核）
   策略：仅用成熟 CSS 特性（Grid/Flex/自定义属性/clamp），
   不使用 :has()、容器查询等较新特性
   ============================================================ */

:root {
  /* 品牌色 */
  --brand: #003070;
  --brand-2: #4d9fff;
  --brand-3: #6ee7ff;
  /* 浅色体系 */
  --ink: #0b1a33;
  --ink-2: #4a5568;
  --ink-3: #8a94a6;
  --bg: #ffffff;
  --bg-soft: #f4f7fb;
  --bg-tint: #f0f6ff;
  --line: #e2e8f0;
  --line-2: #d6e4f5;
  /* 深色体系 */
  --dark: #001a3c;
  --dark-2: #001733;
  --dark-3: #00235c;
  --dark-4: #0a2b5c;
  --dark-text: #b9cce8;
  --dark-line: rgba(120, 170, 255, 0.16);
  /* 结构 */
  --radius: 16px;
  --radius-sm: 12px;
  --container: 1200px;
  --header-h: 72px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-num: "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --shadow-card: 0 4px 24px rgba(0, 48, 112, 0.08);
  --shadow-lift: 0 12px 40px rgba(0, 48, 112, 0.16);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0 0 1em; }
h1, h2, h3, h4 { margin: 0; line-height: 1.35; font-weight: 700; color: var(--ink); }

/* 触屏设备去掉点击高亮蓝块（微信/移动端观感） */
a, button, summary, .btn { -webkit-tap-highlight-color: transparent; }
a, button { touch-action: manipulation; }

:focus-visible { outline: 3px solid var(--brand-2); outline-offset: 2px; border-radius: 4px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--brand); color: #fff; padding: 10px 20px;
}
.skip-link:focus { left: 12px; top: 12px; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; line-height: 1; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  min-height: 44px; white-space: nowrap; font-family: var(--font);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand-2); color: #001530; }
.btn-primary:hover { background: #63acff; box-shadow: 0 8px 24px rgba(77, 159, 255, 0.35); }
.btn-solid { background: var(--brand); color: #fff; }
.btn-solid:hover { background: #0a3f8f; box-shadow: var(--shadow-card); }
.btn-ghost { border-color: rgba(255, 255, 255, 0.4); color: #fff; background: transparent; }
.btn-ghost:hover { border-color: var(--brand-3); color: var(--brand-3); }
.btn-outline { border-color: var(--line-2); color: var(--brand); background: #fff; }
.btn-outline:hover { border-color: var(--brand-2); box-shadow: var(--shadow-card); }
.btn-lg { padding: 16px 34px; font-size: 16px; }
.btn .arrow { font-family: var(--font-num); font-weight: 400; }

/* ---------- 站点导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(0, 26, 60, 0.88);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--dark-line);
  transition: background 0.2s ease;
}
.site-header.scrolled { background: rgba(0, 23, 51, 0.97); box-shadow: 0 6px 24px rgba(0, 10, 30, 0.35); }
.nav { display: flex; align-items: center; gap: 28px; height: var(--header-h); }
.nav-logo { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.nav-logo img { height: 34px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  display: inline-flex; align-items: center; min-height: 44px;
  padding: 10px 14px; border-radius: 10px;
  color: var(--dark-text); font-size: 15px; font-weight: 500;
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }
.nav-links a.active { color: #fff; background: rgba(77, 159, 255, 0.16); }
.nav-cta { margin-left: 12px; }
.nav-phone {
  display: inline-flex; align-items: center; gap: 8px; margin-left: 14px;
  color: #fff; font-family: var(--font-num); font-weight: 700; font-size: 15px;
}
.nav-phone svg { flex: 0 0 auto; }
.menu-btn {
  display: none; margin-left: auto; width: 44px; height: 44px;
  border: 1px solid var(--dark-line); border-radius: 10px;
  background: transparent; cursor: pointer; padding: 10px;
}
.menu-btn span {
  display: block; height: 2px; background: #fff; border-radius: 2px;
  margin: 5px 0; transition: transform 0.2s ease, opacity 0.2s ease;
}
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu { display: none; }

/* ---------- Hero（首页深色首屏） ---------- */
.hero {
  position: relative; background: radial-gradient(1200px 600px at 80% -10%, #0a2b5c 0%, var(--dark) 55%);
  color: #fff; overflow: hidden;
}
.hero-inner {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px;
  align-items: center; padding: 88px 0 72px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px;
  border: 1px solid var(--dark-line); border-radius: 999px;
  background: rgba(77, 159, 255, 0.08); color: var(--brand-3);
  font-size: 13px; font-weight: 600; letter-spacing: 0.04em;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand-3); box-shadow: 0 0 12px var(--brand-3); }
.hero h1 { color: #fff; font-size: clamp(30px, 4.2vw, 52px); margin: 22px 0 18px; letter-spacing: 0.01em; }
.hero h1 .hl { color: var(--brand-3); }
.hero-desc { color: var(--dark-text); font-size: 17px; max-width: 36em; margin-bottom: 30px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 10px 20px; color: var(--dark-text); font-size: 13px; }
.hero-trust li { display: flex; align-items: center; gap: 8px; }
.hero-trust .tick { color: var(--brand-3); font-weight: 700; }
.hero-media { position: relative; }
.hero-media .media-frame { border-color: var(--dark-line); }
.media-frame {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-lift); background: var(--dark-3);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.hero-card-float {
  position: absolute; left: -18px; bottom: -18px; right: auto;
  background: rgba(0, 35, 92, 0.92); border: 1px solid var(--dark-line);
  border-radius: 14px; padding: 14px 18px; max-width: 300px;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.hero-card-float b { color: var(--brand-3); font-size: 14px; display: block; margin-bottom: 4px; }
.hero-card-float span { color: var(--dark-text); font-size: 12.5px; line-height: 1.6; }

/* ---------- 数据带 ---------- */
.stats-band { background: var(--dark-3); color: #fff; border-top: 1px solid var(--dark-line); }
.stats-band .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding-top: 36px; padding-bottom: 36px; }
.stat { text-align: center; }
.stat b { display: block; font-family: var(--font-num); font-size: clamp(26px, 3vw, 40px); font-weight: 800; color: var(--brand-3); letter-spacing: 0.02em; }
.stat span { color: var(--dark-text); font-size: 13.5px; }

/* ---------- 分区通用 ---------- */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); }
.section-tint { background: var(--bg-tint); }
.section-dark { background: var(--dark); color: #fff; }
.section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
.section-head { max-width: 46em; margin-bottom: 44px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--brand); margin-bottom: 14px;
}
.section-dark .eyebrow { color: var(--brand-3); }
.section-head h2 { font-size: clamp(24px, 3vw, 36px); margin-bottom: 14px; }
.section-head p { color: var(--ink-2); font-size: 16.5px; margin: 0; }
.section-dark .section-head p { color: var(--dark-text); }

/* ---------- 网格与卡片 ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  position: relative;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); border-color: var(--line-2); }
.card-badge {
  width: 46px; height: 46px; border-radius: 12px; background: var(--brand);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 17px; margin-bottom: 16px; flex: 0 0 auto;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 14.5px; margin: 0; }
.card .tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--brand); background: var(--bg-tint); border-radius: 999px; padding: 3px 12px; margin-bottom: 10px; }
.card-row { display: flex; gap: 14px; align-items: flex-start; }
.card-row .card-badge { margin-bottom: 0; }

.card-dark {
  background: var(--dark-3); border: 1px solid var(--dark-line);
  border-radius: var(--radius); padding: 26px; color: #fff;
}
.card-dark h3 { color: #fff; font-size: 18px; margin-bottom: 8px; }
.card-dark p { color: var(--dark-text); font-size: 14.5px; margin: 0; }
.card-dark .num { font-family: var(--font-num); font-size: 22px; font-weight: 800; color: var(--brand-2); display: block; margin-bottom: 10px; }
.card-dark .card-badge { background: rgba(77, 159, 255, 0.15); color: var(--brand-3); }

/* ---------- 步骤行（五阶段/流程） ---------- */
.steps { display: grid; gap: 14px; }
.step {
  display: flex; gap: 16px; align-items: flex-start; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px 20px;
}
.step-num { font-family: var(--font-num); font-weight: 800; font-size: 18px; color: var(--brand-2); flex: 0 0 auto; min-width: 34px; }
.step-body b { display: block; font-size: 15.5px; color: var(--ink); margin-bottom: 2px; }
.step-body span { color: var(--ink-2); font-size: 14px; }
.step-out { margin-left: auto; flex: 0 0 auto; align-self: center; font-size: 12.5px; font-weight: 600; color: var(--brand); background: var(--bg-tint); padding: 4px 12px; border-radius: 999px; white-space: nowrap; }

/* 桌面横向五步 */
.steps-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.steps-row .step { flex-direction: column; gap: 10px; padding: 22px; }
.steps-row .step .step-out { margin-left: 0; }

/* ---------- 芯片/标签 ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px;
  border-radius: 999px; border: 1px solid var(--line-2); background: #fff;
  font-size: 13.5px; font-weight: 500; color: var(--ink); line-height: 1.2;
}
.chip.on-dark { background: rgba(255, 255, 255, 0.05); border-color: var(--dark-line); color: var(--dark-text); }
.chip b { color: var(--brand-2); font-family: var(--font-num); }
.chip-accent { background: var(--brand); border-color: var(--brand); color: #fff; }

/* ---------- 页头（内页） ---------- */
.page-hero { background: linear-gradient(160deg, var(--bg-tint) 0%, #fff 70%); border-bottom: 1px solid var(--line); }
.page-hero .container {
  display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 48px;
  align-items: center; padding-top: 72px; padding-bottom: 72px;
}
.page-hero h1 { font-size: clamp(28px, 3.6vw, 44px); margin: 14px 0 16px; }
.page-hero .lead { color: var(--ink-2); font-size: 17px; max-width: 38em; margin: 0; }
.page-hero-aside { display: flex; flex-direction: column; gap: 12px; }
.aside-card {
  background: #fff; border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  padding: 18px 20px; box-shadow: var(--shadow-card);
}
.aside-card b { color: var(--brand); font-size: 13.5px; display: block; margin-bottom: 8px; letter-spacing: 0.03em; }
.aside-card ul { display: grid; gap: 8px; }
.aside-card li { display: flex; gap: 10px; align-items: flex-start; color: var(--ink-2); font-size: 14px; }
.aside-card li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-2); margin-top: 8px; flex: 0 0 auto; }
.aside-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.aside-stat { background: #fff; border: 1px solid var(--line-2); border-radius: var(--radius-sm); padding: 14px 16px; }
.aside-stat b { font-family: var(--font-num); font-size: 24px; font-weight: 800; color: var(--brand); display: block; }
.aside-stat span { color: var(--ink-2); font-size: 12.5px; }

/* 锚点导航（解决方案页） */
.anchor-nav {
  position: sticky; top: var(--header-h); z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.anchor-nav .container { display: flex; gap: 6px; overflow-x: auto; padding-top: 10px; padding-bottom: 10px; -webkit-overflow-scrolling: touch; }
.anchor-nav a {
  flex: 0 0 auto; padding: 8px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 500;
  color: var(--ink-2); border: 1px solid transparent;
}
.anchor-nav a:hover { color: var(--brand); border-color: var(--line-2); background: #fff; }

/* ---------- 分层架构 ---------- */
.arch { display: grid; gap: 10px; }
.arch-layer {
  display: grid; grid-template-columns: 190px 1fr; gap: 18px; align-items: center;
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--dark-line);
  border-radius: var(--radius-sm); padding: 16px 20px;
}
.arch-layer b { color: var(--brand-3); font-size: 15px; }
.arch-layer b small { display: block; color: var(--dark-text); font-weight: 400; font-size: 11.5px; font-family: var(--font-num); letter-spacing: 0.06em; margin-top: 2px; }
.arch-layer span { color: var(--dark-text); font-size: 13.5px; }
.arch-layer.base { background: rgba(77, 159, 255, 0.1); }

/* ---------- 九元组 ---------- */
.tuple { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.tuple-item { background: rgba(255, 255, 255, 0.04); border: 1px solid var(--dark-line); border-radius: var(--radius-sm); padding: 14px 16px; }
.tuple-item b { color: #fff; font-size: 14px; display: block; }
.tuple-item span { color: var(--dark-text); font-size: 12px; font-family: var(--font-num); letter-spacing: 0.04em; }

/* ---------- 历程时间线 ---------- */
.timeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.timeline-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; border-top: 4px solid var(--brand); }
.timeline-item .year { font-family: var(--font-num); font-size: 26px; font-weight: 800; color: var(--brand); }
.timeline-item h3 { font-size: 17px; margin: 8px 0 10px; }
.timeline-item p { color: var(--ink-2); font-size: 14px; margin: 0; }

/* ---------- 团队 ---------- */
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.member {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
  display: flex; gap: 16px; align-items: flex-start; transition: box-shadow 0.18s ease, transform 0.18s ease;
}
.member:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.member-avatar {
  width: 52px; height: 52px; border-radius: 50%; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--brand) 0%, var(--dark-4) 100%);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 19px; font-weight: 700;
}
.member b { font-size: 16.5px; display: block; }
.member .role { color: var(--brand); font-size: 13px; font-weight: 600; display: block; margin: 2px 0 8px; }
.member p { color: var(--ink-2); font-size: 13.5px; line-height: 1.65; margin: 0; }

/* ---------- 客户墙 ---------- */
.client-wall { display: flex; flex-wrap: wrap; gap: 12px; }
.client-wall .client {
  padding: 12px 20px; border: 1px solid var(--line); border-radius: 999px; background: #fff;
  color: var(--ink-2); font-size: 14px; font-weight: 500; transition: border-color 0.15s ease, color 0.15s ease;
}
.client-wall .client:hover { border-color: var(--brand-2); color: var(--brand); }

/* ---------- 案例 ---------- */
.case-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0; overflow: hidden;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-card); margin-bottom: 24px;
}
.case-body { padding: 32px; }
.case-body .tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.case-body h3 { font-size: 21px; margin-bottom: 12px; }
.case-body p { color: var(--ink-2); font-size: 15px; }
.case-points { display: grid; gap: 8px; margin-top: 16px; }
.case-points li { display: flex; gap: 10px; color: var(--ink-2); font-size: 14px; align-items: flex-start; }
.case-points li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-2); margin-top: 8px; flex: 0 0 auto; }
.case-metrics { background: linear-gradient(160deg, var(--dark-3), var(--dark)); color: #fff; padding: 32px; display: flex; flex-direction: column; justify-content: center; gap: 18px; }
.case-metrics .m b { font-family: var(--font-num); font-size: 30px; font-weight: 800; color: var(--brand-3); display: block; line-height: 1.2; }
.case-metrics .m span { color: var(--dark-text); font-size: 13px; }
.case-metrics .m + .m { border-top: 1px solid var(--dark-line); padding-top: 18px; }

.case-group { margin-bottom: 40px; }
.case-group h3 { font-size: 18px; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.case-group h3 .g-tag { font-size: 12px; font-weight: 600; color: var(--brand); background: var(--bg-tint); border-radius: 999px; padding: 3px 12px; }
.case-mini-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.case-mini {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px 18px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.case-mini:hover { border-color: var(--line-2); box-shadow: var(--shadow-card); }
.case-mini b { display: block; font-size: 14.5px; margin-bottom: 4px; color: var(--ink); }
.case-mini span { color: var(--ink-2); font-size: 12.5px; line-height: 1.6; display: block; }
.case-mini .m-tag { font-size: 11.5px; font-weight: 600; color: var(--brand); background: var(--bg-tint); border-radius: 999px; padding: 2px 10px; display: inline-block; margin-bottom: 8px; }

/* ---------- CTA 带 ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--dark-3) 0%, var(--dark) 60%);
  color: #fff; border-radius: var(--radius); padding: 48px 44px;
  display: grid; grid-template-columns: 1.4fr 0.6fr; gap: 32px; align-items: center;
  border: 1px solid var(--dark-line); position: relative; overflow: hidden;
}
.cta-band::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(110, 231, 255, 0.18) 0%, transparent 70%); pointer-events: none;
}
.cta-band h2 { color: #fff; font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 10px; }
.cta-band p { color: var(--dark-text); margin: 0; font-size: 15.5px; }
.cta-contact { text-align: right; }
.cta-contact .label { color: var(--dark-text); font-size: 13px; display: block; margin-bottom: 6px; }
.cta-contact .tel {
  display: inline-flex; align-items: center; gap: 10px; color: #fff;
  font-family: var(--font-num); font-size: clamp(24px, 3vw, 32px); font-weight: 800; letter-spacing: 0.02em;
}
.cta-contact .tel:hover { color: var(--brand-3); }
.cta-actions { margin-top: 14px; display: flex; gap: 12px; justify-content: flex-end; flex-wrap: wrap; }

/* ---------- 表单 ---------- */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow-card); }
.form-card h3 { font-size: 19px; margin-bottom: 6px; }
.form-card > p { color: var(--ink-2); font-size: 14px; margin-bottom: 20px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.field label .req { color: #d9435f; margin-left: 2px; }
.field input, .field textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  font-size: 15px; font-family: var(--font); color: var(--ink); background: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  min-height: 46px;
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field textarea:focus { border-color: var(--brand-2); box-shadow: 0 0 0 3px rgba(77, 159, 255, 0.18); outline: none; }
.field .err { display: none; color: #d9435f; font-size: 12.5px; margin-top: 5px; }
.field.invalid input, .field.invalid textarea { border-color: #d9435f; }
.field.invalid .err { display: block; }
.form-result {
  display: none; border: 1px solid #b7e3c8; background: #f0faf3; border-radius: var(--radius-sm);
  padding: 22px; margin-top: 18px;
}
.form-result.show { display: block; }
.form-result b { color: #1c7a3d; display: block; margin-bottom: 6px; font-size: 15.5px; }
.form-result p { color: #2c5a3c; font-size: 14px; margin-bottom: 14px; }
.form-result .actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn-call { background: #1c7a3d; color: #fff; }
.btn-call:hover { background: #239a4e; }

/* ---------- 电话卡（联系页深色卡） ---------- */
.phone-card {
  background: radial-gradient(600px 300px at 100% 0%, #0a2b5c 0%, var(--dark) 60%);
  border: 1px solid var(--dark-line); border-radius: var(--radius); color: #fff; padding: 30px;
}
.phone-card .label { color: var(--dark-text); font-size: 13.5px; display: block; margin-bottom: 8px; }
.phone-card .name { color: #fff; font-size: 19px; font-weight: 700; display: block; margin-bottom: 14px; }
.phone-card .tel {
  display: inline-flex; align-items: center; gap: 10px; color: #fff;
  font-family: var(--font-num); font-size: clamp(26px, 3vw, 34px); font-weight: 800; letter-spacing: 0.02em;
}
.phone-card .tel:hover { color: var(--brand-3); }
.phone-card .hint { color: var(--dark-text); font-size: 13px; margin: 14px 0 0; }
.promise-list { display: grid; gap: 10px; margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--dark-line); }
.promise-list li { display: flex; gap: 10px; align-items: flex-start; color: var(--dark-text); font-size: 14px; }
.promise-list li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-3); margin-top: 8px; flex: 0 0 auto; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.faq-item summary {
  cursor: pointer; padding: 18px 22px; font-size: 15.5px; font-weight: 600; color: var(--ink);
  list-style: none; display: flex; align-items: center; gap: 12px; min-height: 44px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; margin-left: auto; font-family: var(--font-num); font-size: 20px; font-weight: 400;
  color: var(--brand-2); transition: transform 0.2s ease; flex: 0 0 auto;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { color: var(--brand); }
.faq-item .faq-a { padding: 0 22px 20px; color: var(--ink-2); font-size: 14.5px; }
.faq-item .faq-a p { margin: 0 0 8px; }
.faq-item .faq-a p:last-child { margin-bottom: 0; }

/* ---------- 合作模式（深色带内） ---------- */
.coop-band { background: var(--dark); border: 1px solid var(--dark-line); border-radius: var(--radius); padding: 34px; }
.coop-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.coop-item b { color: #fff; font-size: 16px; display: block; margin-bottom: 6px; }
.coop-item span { color: var(--dark-text); font-size: 13.5px; }
.coop-item { border-top: 2px solid var(--brand-2); padding-top: 14px; }

/* ---------- 流程带/注脚 ---------- */
.note-band {
  display: flex; gap: 12px; align-items: flex-start; background: var(--bg-tint);
  border: 1px solid var(--line-2); border-radius: var(--radius-sm); padding: 16px 20px;
  color: var(--ink-2); font-size: 14px; margin-top: 24px;
}
.note-band b { color: var(--brand); flex: 0 0 auto; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--dark-2); color: var(--dark-text); border-top: 1px solid var(--dark-line); }
.footer-top { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.1fr; gap: 36px; padding: 56px 0 40px; }
/* 页脚文字品牌标（替代位图 Logo，避免拉伸变形） */
.footer-brand .brand-mark { display: inline-block; margin-bottom: 14px; }
.footer-brand .brand-name { display: block; color: #fff; font-size: 24px; font-weight: 800; letter-spacing: 0.1em; line-height: 1.25; }
.footer-brand .brand-name em { font-style: normal; color: var(--brand-3); }
.footer-brand .brand-sub { display: block; margin-top: 5px; color: var(--dark-text); font-size: 10.5px; letter-spacing: 0.16em; font-family: var(--font-num); }
.footer-brand p { color: var(--dark-text); font-size: 13.5px; margin: 0 0 14px; max-width: 30em; }
.footer-brand .badges { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-col h4 { color: #fff; font-size: 14.5px; margin-bottom: 16px; letter-spacing: 0.04em; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: var(--dark-text); font-size: 13.5px; }
.footer-col a:hover { color: #fff; }
.footer-contact .tel { color: #fff; font-family: var(--font-num); font-size: 20px; font-weight: 800; display: inline-flex; align-items: center; gap: 8px; }
.footer-contact .tel:hover { color: var(--brand-3); }
.footer-contact p { font-size: 13px; margin: 10px 0 0; }
.footer-bottom {
  border-top: 1px solid var(--dark-line); padding: 20px 0;
  display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: center; justify-content: space-between;
  font-size: 12.5px;
}
.footer-bottom a { color: var(--dark-text); }
.footer-bottom a:hover { color: #fff; }

/* ---------- 工具类 ---------- */
.mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.center { text-align: center; }
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.breadcrumb { font-size: 13px; color: var(--ink-3); margin-bottom: 6px; }
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--brand); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .steps-row { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .hero-inner { gap: 36px; }
  .case-mini-grid { grid-template-columns: repeat(2, 1fr); }
  .coop-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  body { font-size: 15px; }
  .section { padding: 56px 0; }
  .container { padding: 0 18px; }
  /* 导航：收进抽屉 */
  .nav-links, .nav-cta, .nav-phone { display: none; }
  .menu-btn { display: block; }
  .mobile-menu {
    display: none; position: fixed; left: 0; right: 0; top: var(--header-h); z-index: 99;
    background: var(--dark-2); border-bottom: 1px solid var(--dark-line);
    padding: 10px 18px 18px; box-shadow: 0 20px 40px rgba(0, 10, 30, 0.4);
  }
  .mobile-menu.open { display: block; }
  .mobile-menu a {
    display: flex; align-items: center; min-height: 48px; padding: 12px 8px;
    color: var(--dark-text); font-size: 16px; border-bottom: 1px solid var(--dark-line);
  }
  .mobile-menu a.active { color: #fff; font-weight: 700; }
  .mobile-menu .m-call {
    display: flex; justify-content: center; margin-top: 14px; padding: 0;
  }
  .hero-inner { grid-template-columns: 1fr; padding: 52px 0 48px; gap: 32px; }
  .hero-card-float { position: static; margin-top: 12px; max-width: none; }
  .stats-band .container { grid-template-columns: repeat(2, 1fr); gap: 18px; padding-top: 26px; padding-bottom: 26px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .split-2 { grid-template-columns: 1fr; gap: 24px; }
  .page-hero .container { grid-template-columns: 1fr; gap: 24px; padding-top: 44px; padding-bottom: 44px; }
  .case-card { grid-template-columns: 1fr; }
  .case-metrics { flex-direction: row; flex-wrap: wrap; gap: 20px 28px; padding: 24px; }
  .case-metrics .m + .m { border-top: none; padding-top: 0; }
  .timeline, .team-grid { grid-template-columns: 1fr; }
  .steps-row { grid-template-columns: 1fr; }
  .steps-row .step { flex-direction: row; }
  .steps-row .step .step-out { margin-left: auto; }
  .tuple { grid-template-columns: 1fr 1fr; }
  .arch-layer { grid-template-columns: 1fr; gap: 6px; }
  .cta-band { grid-template-columns: 1fr; padding: 30px 24px; }
  .cta-contact { text-align: left; }
  .cta-actions { justify-content: flex-start; }
  .footer-top { grid-template-columns: 1fr; gap: 26px; padding: 40px 0 28px; }
  .hero-actions .btn { flex: 1 1 auto; }
}

@media (max-width: 420px) {
  .case-mini-grid { grid-template-columns: 1fr; }
  .coop-grid { grid-template-columns: 1fr; }
  .aside-stats { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 27px; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header, .mobile-menu, .hero-actions, .cta-actions, .anchor-nav { display: none !important; }
}