/* ==========================================================================
   杭州金芒网络科技有限公司 — 企业官网样式表
   设计基调：深墨蓝 + 金色点缀 / 简约大气 / 大量留白
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #0a1f3c;
  --ink-2: #12304f;
  --ink-3: #1b4168;
  --blue: #1677ff;
  --blue-light: #6aa8ff;
  --blue-deep: #0e5fd8;

  --text: #16202e;
  --text-soft: #55657a;
  --text-mute: #8895a6;

  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-ink: #0a1f3c;
  --line: #e6ebf1;
  --line-strong: #d3dbe4;

  --radius: 4px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(10, 31, 60, .04);
  --shadow: 0 8px 30px rgba(10, 31, 60, .07);
  --shadow-lg: 0 20px 60px rgba(10, 31, 60, .12);

  --container: 1200px;
  --header-h: 76px;

  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
          Helvetica, Arial, "Source Han Sans SC", sans-serif;
  --font-num: "Helvetica Neue", Helvetica, Arial, sans-serif;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; color: inherit; cursor: pointer; }

::selection { background: rgba(22, 119, 255, .25); }

/* ---------- 3. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

.section { padding: 110px 0; }
.section--soft { background: var(--bg-soft); }
.section--ink { background: var(--ink); color: #fff; }
.section--tight { padding: 80px 0; }

.section-head { max-width: 720px; margin-bottom: 64px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--blue-deep);
  text-transform: uppercase;
  margin-bottom: 20px;
  font-weight: 600;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--blue);
}
.section--ink .eyebrow { color: var(--blue-light); }

.section-title {
  font-size: 40px;
  line-height: 1.32;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ink);
}
.section--ink .section-title { color: #fff; }

.section-desc {
  margin-top: 20px;
  font-size: 16.5px;
  color: var(--text-soft);
  line-height: 1.9;
}
.section--ink .section-desc { color: rgba(255, 255, 255, .68); }

.gold { color: var(--blue); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 52px;
  padding: 0 34px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .06em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: all .3s var(--ease);
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; transition: transform .3s var(--ease); }
.btn:hover svg { transform: translateX(4px); }

.btn--primary {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-deep) 100%);
  color: #fff;
  box-shadow: 0 6px 20px rgba(14, 95, 216, .22);
}
.btn--primary:hover {
  box-shadow: 0 12px 32px rgba(14, 95, 216, .34);
  transform: translateY(-2px);
}

.btn--ink {
  background: var(--ink);
  color: #fff;
}
.btn--ink:hover { background: var(--ink-3); transform: translateY(-2px); }

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--ink);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--ink); background: var(--ink); color: #fff; }

.btn--ghost-light {
  border-color: rgba(255, 255, 255, .3);
  color: #fff;
}
.btn--ghost-light:hover { background: #fff; color: var(--ink); border-color: #fff; }

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 900;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: all .35s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 2px 20px rgba(10, 31, 60, .05);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 44px; height: 44px;
  flex: none;
  display: grid;
  place-items: center;
}
.logo-mark img {
  width: 100%; height: 100%;
  object-fit: contain;
}
.logo-text { line-height: 1.15; }
.logo-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
}
.logo-sub {
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--text-mute);
  text-transform: uppercase;
}

/* 主导航 */
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  position: relative;
  display: block;
  padding: 10px 20px;
  font-size: 15px;
  color: var(--text-soft);
  transition: color .25s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 20px; right: 20px;
  bottom: 2px;
  height: 1.5px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after,
.nav a.is-active::after { transform: scaleX(1); }
.nav a.is-active { color: var(--ink); font-weight: 500; }

.header-actions { display: flex; align-items: center; gap: 14px; }
.header-tel {
  font-size: 14px;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-num);
  letter-spacing: .02em;
}
.header-tel svg { width: 15px; height: 15px; color: var(--blue); }
.header-cta {
  height: 42px;
  padding: 0 22px;
  font-size: 14px;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 11px;
  width: 20px; height: 1.5px;
  background: var(--ink);
  transition: all .3s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 25px; }
.nav-toggle.is-open span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

/* 移动端抽屉 */
.mobile-nav {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 8px 0 24px;
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  transition: all .3s var(--ease);
  z-index: 890;
  box-shadow: var(--shadow);
}
.mobile-nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
.mobile-nav a {
  display: block;
  padding: 15px 32px;
  font-size: 16px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--line);
}
.mobile-nav a.is-active { color: var(--ink); font-weight: 500; }
.mobile-nav .mobile-cta { margin: 20px 32px 0; }

/* ---------- 6. 英雄区 ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 110px) 0 130px;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 520px at 78% 18%, rgba(22, 119, 255, .20), transparent 62%),
    radial-gradient(700px 460px at 8% 88%, rgba(27, 65, 104, .85), transparent 65%),
    linear-gradient(160deg, #0a1f3c 0%, #0d2745 52%, #0a1f3c 100%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 78%);
}
.hero .container { position: relative; z-index: 2; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 70px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 12px;
  border: 1px solid rgba(22, 119, 255, .38);
  border-radius: 100px;
  font-size: 13px;
  color: var(--blue-light);
  letter-spacing: .06em;
  margin-bottom: 30px;
  background: rgba(22, 119, 255, .07);
}
.hero-badge .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(22, 119, 255, .18);
}

.hero h1 {
  font-size: 56px;
  line-height: 1.24;
  font-weight: 600;
  letter-spacing: .005em;
}
.hero h1 .gold-line {
  background: linear-gradient(100deg, var(--blue-light), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 26px;
  font-size: 17px;
  line-height: 1.95;
  color: rgba(255, 255, 255, .72);
  max-width: 540px;
}

.hero-actions {
  margin-top: 44px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  margin-top: 72px;
  padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, .14);
  display: flex;
  gap: 60px;
}
.hero-stats .num {
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 600;
  color: #fff;
  line-height: 1.2;
}
.hero-stats .num small { font-size: 18px; color: var(--blue); margin-left: 2px; }
.hero-stats .label {
  font-size: 13.5px;
  color: rgba(255, 255, 255, .55);
  letter-spacing: .05em;
  margin-top: 4px;
}

/* 英雄区右侧视觉 */
.hero-visual { position: relative; }
.hero-card {
  position: relative;
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 10px;
  background: rgba(255, 255, 255, .045);
  backdrop-filter: blur(8px);
  padding: 30px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .3);
}
.hero-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  margin-bottom: 22px;
}
.hero-card-head .t { font-size: 14px; color: rgba(255, 255, 255, .8); letter-spacing: .05em; }
.win-dots { display: flex; gap: 6px; }
.win-dots i {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .18);
}
.win-dots i:first-child { background: rgba(22, 119, 255, .8); }

.code-line {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 9px 0;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .6);
}
.code-line .k { color: var(--blue-light); }
.code-line .bar {
  flex: 1;
  height: 7px;
  border-radius: 4px;
  background: rgba(255, 255, 255, .1);
  overflow: hidden;
}
.code-line .bar i {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, rgba(22, 119, 255, .9), rgba(22, 119, 255, .3));
}

.hero-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.hero-tag-row span {
  font-size: 12px;
  color: rgba(255, 255, 255, .7);
  border: 1px solid rgba(255, 255, 255, .15);
  padding: 5px 12px;
  border-radius: 100px;
}

/* 页面通用小英雄（内页） */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 86px) 0 86px;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(760px 420px at 82% 12%, rgba(22, 119, 255, .17), transparent 60%),
    linear-gradient(150deg, #0a1f3c, #10304f 70%, #0a1f3c);
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(circle at 60% 30%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 60% 30%, #000, transparent 75%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 {
  font-size: 46px;
  font-weight: 600;
  line-height: 1.3;
}
.page-hero p {
  margin-top: 20px;
  max-width: 660px;
  color: rgba(255, 255, 255, .68);
  font-size: 16.5px;
  line-height: 1.9;
}

/* 面包屑 */
.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, .45);
  margin-bottom: 24px;
}
.crumbs a:hover { color: var(--blue-light); }
.crumbs i { width: 14px; height: 1px; background: rgba(255, 255, 255, .3); }

/* ---------- 7. 卡片网格 ---------- */
.grid { display: grid; gap: 26px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  transition: all .38s var(--ease);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .45s var(--ease);
}
.card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}
.card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 54px; height: 54px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, #f3f6fa, #e9eef5);
  color: var(--ink);
  margin-bottom: 26px;
  transition: all .38s var(--ease);
}
.card-icon svg { width: 26px; height: 26px; }
.card:hover .card-icon {
  background: linear-gradient(140deg, var(--ink-3), var(--ink));
  color: var(--blue-light);
}
.card h3 {
  font-size: 19.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: .01em;
}
.card p {
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.85;
}
.card-list { margin-top: 22px; }
.card-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-soft);
  line-height: 2;
}
.card-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 13px;
  width: 7px; height: 1.5px;
  background: var(--blue);
}

.card-num {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--blue);
  letter-spacing: .12em;
  margin-bottom: 22px;
  font-weight: 600;
}

/* ---------- 8. 数据条 ---------- */
.stats-band {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 72px 0;
}
.stats-band .grid { gap: 0; }
.stat-item {
  text-align: center;
  padding: 12px 20px;
  border-right: 1px solid var(--line);
}
.stat-item:last-child { border-right: none; }
.stat-item .num {
  font-family: var(--font-num);
  font-size: 46px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -.01em;
}
.stat-item .num small { font-size: 22px; color: var(--blue); margin-left: 2px; font-weight: 500; }
.stat-item .label {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--text-soft);
  letter-spacing: .04em;
}

/* ---------- 9. 关于 / 图文双栏 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.split--reverse .split-media { order: 2; }

.split-body p {
  font-size: 16px;
  color: var(--text-soft);
  line-height: 2;
  margin-bottom: 18px;
}

.media-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(500px 300px at 70% 20%, rgba(22, 119, 255, .3), transparent 60%),
    linear-gradient(150deg, #10304f, #0a1f3c);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 44px 44px;
}
.media-frame .media-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
}
.media-frame .media-inner .big {
  font-size: 64px;
  font-weight: 600;
  font-family: var(--font-num);
  letter-spacing: -.02em;
  background: linear-gradient(120deg, #fff, var(--blue-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
}
.media-frame .media-inner .small {
  margin-top: 10px;
  font-size: 14px;
  letter-spacing: .22em;
  color: rgba(255, 255, 255, .6);
}

.check-list { margin-top: 30px; display: grid; gap: 14px; }
.check-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 15.5px;
  color: var(--text-soft);
  line-height: 1.7;
}
.check-list .tick {
  flex: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(22, 119, 255, .13);
  color: var(--blue-deep);
  display: grid;
  place-items: center;
  margin-top: 2px;
}
.check-list .tick svg { width: 12px; height: 12px; }
.check-list b { color: var(--ink); font-weight: 600; }

/* ---------- 10. 时间轴 ---------- */
.timeline { position: relative; padding-left: 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 118px;
  top: 8px; bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}
.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 46px;
  padding-bottom: 52px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-year {
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 600;
  color: var(--blue-deep);
  letter-spacing: .02em;
  text-align: right;
  line-height: 1.5;
}
.timeline-content { position: relative; }
.timeline-content::before {
  content: "";
  position: absolute;
  left: -52px;
  top: 13px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--blue);
  box-shadow: 0 0 0 4px rgba(22, 119, 255, .12);
}
.timeline-content h3 {
  font-size: 18.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}
.timeline-content p {
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.9;
}

/* ---------- 11. 开发流程 ---------- */
.process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
.process-step {
  position: relative;
  padding: 0 22px;
  border-left: 1px solid var(--line);
}
.process-step:last-child { border-right: 1px solid var(--line); }
.process-step .idx {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--blue-deep);
  font-weight: 600;
  margin-bottom: 20px;
}
.process-step h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}
.process-step p {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.85;
}
.process-step::after {
  content: "";
  position: absolute;
  left: -4.5px; top: 6px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0;
  transition: opacity .3s var(--ease);
}
.section--ink .process-step { border-color: rgba(255, 255, 255, .14); }
.section--ink .process-step h3 { color: #fff; }
.section--ink .process-step p { color: rgba(255, 255, 255, .62); }
.section--ink .process-step .idx { color: var(--blue-light); }

/* ---------- 12. 技术栈 ---------- */
.tech-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.tech-group h4 {
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--blue-deep);
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.tech-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tech-tags span {
  font-size: 13.5px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-soft);
  background: #fff;
  transition: all .28s var(--ease);
}
.tech-tags span:hover {
  border-color: var(--blue);
  color: var(--blue-deep);
  background: rgba(22, 119, 255, .06);
}
.section--ink .tech-group h4 { color: var(--blue-light); border-color: rgba(255, 255, 255, .14); }
.section--ink .tech-tags span {
  background: rgba(255, 255, 255, .05);
  border-color: rgba(255, 255, 255, .13);
  color: rgba(255, 255, 255, .75);
}
.section--ink .tech-tags span:hover {
  border-color: var(--blue);
  color: var(--blue-light);
  background: rgba(22, 119, 255, .12);
}

/* ---------- 13. 案例 / 客户 ---------- */
.case-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all .38s var(--ease);
}
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: transparent; }
.case-thumb {
  height: 168px;
  position: relative;
  display: grid;
  place-items: center;
  background: linear-gradient(150deg, var(--ink-3), var(--ink));
  overflow: hidden;
}
.case-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 34px 34px;
}
.case-thumb .abbr {
  position: relative;
  z-index: 2;
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 600;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .9);
}
.case-thumb .abbr::after {
  content: "";
  display: block;
  width: 34px; height: 2px;
  background: var(--blue);
  margin: 12px auto 0;
}
.case-body { padding: 28px 30px 32px; }
.case-body .tag {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue-deep);
  font-weight: 600;
  margin-bottom: 12px;
}
.case-body h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.case-body p { font-size: 14.5px; color: var(--text-soft); line-height: 1.85; }

/* ---------- 14. 行动号召 ---------- */
.cta-band {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: 96px 0;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(680px 380px at 50% 0%, rgba(22, 119, 255, .22), transparent 62%),
    linear-gradient(150deg, #0a1f3c, #10304f);
}
.cta-band .container { position: relative; z-index: 2; text-align: center; }
.cta-band h2 {
  font-size: 38px;
  font-weight: 600;
  line-height: 1.35;
}
.cta-band p {
  margin: 20px auto 0;
  max-width: 620px;
  color: rgba(255, 255, 255, .68);
  font-size: 16.5px;
  line-height: 1.9;
}
.cta-band .hero-actions { justify-content: center; margin-top: 40px; }

/* ---------- 15. 联系我们 ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 70px;
  align-items: start;
}
.contact-cards { display: grid; gap: 18px; }
.contact-card {
  display: flex;
  gap: 20px;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  transition: all .34s var(--ease);
}
.contact-card:hover { border-color: rgba(22, 119, 255, .5); box-shadow: var(--shadow); }
.contact-card .ico {
  flex: none;
  width: 46px; height: 46px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, #f3f6fa, #e9eef5);
  color: var(--ink);
}
.contact-card .ico svg { width: 21px; height: 21px; }
.contact-card .label {
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--text-mute);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.contact-card .value {
  font-size: 16.5px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.6;
  word-break: break-all;
}
.contact-card .value.small { font-size: 15px; font-weight: 400; color: var(--text-soft); }
.contact-card a.value:hover { color: var(--blue-deep); }

/* 表单 */
.form-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 46px 44px;
  box-shadow: var(--shadow-sm);
}
.form-panel h3 { font-size: 22px; font-weight: 600; color: var(--ink); }
.form-panel .hint { margin-top: 10px; font-size: 14.5px; color: var(--text-soft); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
.field { display: flex; flex-direction: column; gap: 9px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 13.5px; color: var(--text-soft); letter-spacing: .04em; }
.field label .req { color: #c0392b; margin-left: 3px; }
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 15px;
  color: var(--text);
  padding: 14px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-soft);
  transition: all .25s var(--ease);
  width: 100%;
  outline: none;
}
.field textarea { resize: vertical; min-height: 130px; line-height: 1.7; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--blue);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(22, 119, 255, .12);
}
.field input::placeholder,
.field textarea::placeholder { color: #a8b3c2; }

.form-foot {
  margin-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.form-note { font-size: 13px; color: var(--text-mute); line-height: 1.7; }

.form-success {
  display: none;
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: rgba(22, 119, 255, .1);
  border: 1px solid rgba(22, 119, 255, .35);
  color: var(--blue-deep);
  font-size: 14.5px;
}
.form-success.is-visible { display: block; }

/* 地址信息块 */
.address-panel {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.address-map {
  height: 240px;
  position: relative;
  background: var(--ink);
  display: grid;
  place-items: center;
}
.address-map::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 30px 30px;
  background-color: #0e2843;
}
.address-map::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 56%;
  height: 12px;
  background: rgba(22, 119, 255, .18);
  transform: rotate(-4deg);
}
.address-pin {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
}
.address-pin svg { width: 30px; height: 30px; color: var(--blue); }
.address-pin .n { margin-top: 8px; font-size: 14.5px; letter-spacing: .1em; }
.address-info { padding: 26px 28px; background: #fff; }
.address-info .line {
  display: flex;
  gap: 12px;
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.85;
  padding: 7px 0;
}
.address-info .line b { color: var(--ink); font-weight: 500; min-width: 62px; flex: none; }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, .62);
  padding: 78px 0 0;
  font-size: 14.5px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 50px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-brand .logo { margin-bottom: 22px; }
.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-sub { color: rgba(255, 255, 255, .4); }
.footer-brand p { line-height: 1.95; max-width: 320px; color: rgba(255, 255, 255, .55); }

.footer-col h4 {
  font-size: 14px;
  color: #fff;
  font-weight: 600;
  letter-spacing: .08em;
  margin-bottom: 22px;
}
.footer-col li { margin-bottom: 12px; }
.footer-col a { color: rgba(255, 255, 255, .6); transition: color .25s var(--ease); }
.footer-col a:hover { color: var(--blue-light); }
.footer-col .contact-line { display: flex; gap: 10px; line-height: 1.8; margin-bottom: 14px; }
.footer-col .contact-line svg { width: 16px; height: 16px; color: var(--blue); flex: none; margin-top: 4px; }

.footer-bottom {
  padding: 26px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: rgba(255, 255, 255, .4);
}
.footer-bottom a { color: rgba(255, 255, 255, .4); }
.footer-bottom a:hover { color: var(--blue-light); }

/* ---------- 17. 滚动动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }
.reveal.d5 { transition-delay: .4s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  border: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .35s var(--ease);
  z-index: 800;
  box-shadow: 0 8px 24px rgba(10, 31, 60, .22);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--blue-deep); }
.to-top svg { width: 18px; height: 18px; }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1100px) {
  .hero h1 { font-size: 46px; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual { max-width: 540px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 44px; }
  .process { grid-template-columns: repeat(3, 1fr); }
  .process-step { padding: 0 20px 34px; }
  .process-step:nth-child(4) { border-left: 1px solid var(--line); }
  .process-step:last-child { border-right: 1px solid var(--line); }
}

@media (max-width: 980px) {
  .nav, .header-tel { display: none; }
  .nav-toggle { display: block; }
  .container { padding: 0 22px; }
  .section { padding: 82px 0; }
  .section-title { font-size: 32px; }
  .page-hero h1 { font-size: 36px; }
  .page-hero p { font-size: 15.5px; }
  .hero { padding: calc(var(--header-h) + 74px) 0 90px; }
  .hero h1 { font-size: 38px; }
  .hero h1 br { display: none; }
  .hero-sub { font-size: 16px; }
  .hero-stats { gap: 34px; flex-wrap: wrap; margin-top: 54px; }
  .stats-band .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-right: none; padding: 22px 12px; }
  .stat-item:nth-child(odd) { border-right: 1px solid var(--line); }
  .stat-item:nth-child(1), .stat-item:nth-child(2) { border-bottom: 1px solid var(--line); }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 46px; }
  .split--reverse .split-media { order: 0; }
  .contact-layout { grid-template-columns: 1fr; gap: 46px; }
  .tech-groups { grid-template-columns: 1fr; }
  .timeline::before { left: 78px; }
  .timeline-item { grid-template-columns: 78px 1fr; gap: 32px; }
  .timeline-content::before { left: -38px; }
  .timeline-year { font-size: 18px; }
}

@media (max-width: 720px) {
  .section { padding: 66px 0; }
  .section-head { margin-bottom: 44px; }
  .section-title { font-size: 27px; }
  .cta-band h2 { font-size: 26px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .stats-band .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(odd) { border-right: 1px solid var(--line); }
  .stat-item .num { font-size: 34px; }
  .stat-item .num small { font-size: 17px; }
  .process { grid-template-columns: 1fr; }
  .process-step { border-left: 1px solid var(--line); border-right: 1px solid var(--line); padding: 24px 22px; }
  .card { padding: 32px 26px; }
  .form-panel { padding: 32px 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 31px; }
  .hero-stats .num { font-size: 27px; }
  .hero-stats { gap: 26px; }
  .hero-actions .btn { flex: 1; min-width: 140px; }
  .form-foot { flex-direction: column; align-items: stretch; }
  .form-foot .btn { width: 100%; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .page-hero h1 { font-size: 28px; }
  .page-hero { padding: calc(var(--header-h) + 58px) 0 62px; }
  .section-title br, .cta-band h2 br { display: none; }
}