/* =========================================================
   爆爆出海 · 官网样式
   科技蓝青主色 + 橙红「爆发」点缀，深色 Hero + 浅色正文
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root {
  --navy-900: #070B14;
  --navy-800: #0B1220;
  --navy-700: #121C33;

  --blue-600: #2563EB;
  --blue-500: #3B82F6;
  --blue-400: #60A5FA;
  --cyan-400: #22D3EE;

  --hot-500: #FF7A18;
  --hot-600: #FF3D6E;

  --ink: #0D1526;
  --ink-2: #33415C;
  --muted: #6B7A99;
  --line: #E6EAF2;
  --bg: #FFFFFF;
  --bg-tint: #F6F8FC;

  --grad-tech: linear-gradient(120deg, #2563EB 0%, #22D3EE 100%);
  --grad-hot: linear-gradient(120deg, #FF7A18 0%, #FF3D6E 100%);
  --grad-text: linear-gradient(100deg, #2563EB 0%, #0EA5E9 50%, #0E7490 100%);

  --shadow-sm: 0 2px 8px rgba(13, 21, 38, .05);
  --shadow-md: 0 14px 38px -14px rgba(13, 21, 38, .18);
  --shadow-lg: 0 28px 70px -26px rgba(20, 40, 90, .34);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 30px;

  --nav-h: 72px;
  --ease: cubic-bezier(.22, .68, .24, 1);
}

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

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

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; letter-spacing: -.01em; font-weight: 700; }
p { margin: 0; }
ul, ol, li { margin: 0; padding: 0; list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 锚点定位补偿固定导航高度 */
section[id], div[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: #fff; color: var(--blue-600); padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

::selection { background: rgba(59, 130, 246, .22); }

/* 渐变文字 */
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.section--dark .grad-text {
  background: linear-gradient(100deg, #60A5FA 0%, #22D3EE 50%, #FF9A5A 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
}
.btn--lg { padding: 15px 30px; font-size: 16px; }
.btn--block { width: 100%; }

.btn--primary {
  background: var(--grad-tech);
  color: #fff;
  box-shadow: 0 10px 26px -10px rgba(37, 99, 235, .65);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 38px -12px rgba(37, 99, 235, .7);
}

.btn--ghost {
  background: rgba(255, 255, 255, .06);
  border-color: rgba(255, 255, 255, .22);
  color: #fff;
  backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, .12);
  border-color: rgba(255, 255, 255, .4);
  transform: translateY(-2px);
}
.btn svg { transition: transform .25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }

/* =========================================================
   导航
   ========================================================= */
.nav {
  position: fixed; inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: background .35s var(--ease), box-shadow .35s var(--ease),
              backdrop-filter .35s var(--ease);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand__mark { display: block; color: #fff; transition: color .35s var(--ease); }
.brand__mark svg { display: block; }
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__line1 { display: flex; align-items: baseline; gap: 7px; }
.brand__text strong {
  font-size: 19px; font-weight: 800; letter-spacing: .08em;
  color: #fff; transition: color .35s var(--ease);
}
.brand__text i {
  font-style: normal; font-size: 13.5px; font-weight: 700; letter-spacing: .04em;
  color: rgba(255, 255, 255, .74); transition: color .35s var(--ease);
}
.brand__text em {
  font-style: normal; font-size: 9px; letter-spacing: .2em;
  font-weight: 600; color: rgba(255, 255, 255, .5); text-transform: uppercase;
  transition: color .35s var(--ease);
}

.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__links > a {
  padding: 9px 14px; border-radius: 999px;
  font-size: 15px; font-weight: 500;
  color: rgba(255, 255, 255, .78);
  transition: color .22s var(--ease), background .22s var(--ease);
}
.nav__links > a:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.nav__cta { margin-left: 10px; color: #fff !important; }
.nav__cta:hover { background: var(--grad-tech) !important; }

/* 滚动后：白底深字（用实色背景，不依赖 backdrop-filter，任何渲染环境都成立） */
.nav.is-scrolled {
  background: #FFFFFF;
  box-shadow: 0 1px 0 var(--line), 0 8px 30px -18px rgba(13, 21, 38, .3);
}
.nav.is-scrolled .brand__mark { color: var(--ink); }
.nav.is-scrolled .brand__text strong { color: var(--ink); }
.nav.is-scrolled .brand__text i { color: var(--ink-2); }
.nav.is-scrolled .brand__text em { color: var(--muted); }
.nav.is-scrolled .nav__links > a { color: var(--ink-2); }
.nav.is-scrolled .nav__links > a:hover { color: var(--blue-600); background: rgba(59, 130, 246, .08); }
.nav.is-scrolled .nav__cta { color: #fff !important; }
.nav.is-scrolled .nav__toggle span { background: var(--ink); }

.nav__toggle {
  display: none; width: 42px; height: 42px;
  background: none; border: 0; cursor: pointer;
  padding: 0; flex-direction: column; gap: 5px;
  align-items: center; justify-content: center;
}
.nav__toggle span {
  display: block; width: 20px; height: 2px; border-radius: 2px;
  background: #fff; transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 74px) 0 78px;
  background: radial-gradient(1200px 600px at 78% -10%, #1B2C55 0%, transparent 60%),
              linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 55%, #0A1020 100%);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55; }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(120, 170, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 255, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(900px 520px at 50% 26%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(900px 520px at 50% 26%, #000 0%, transparent 78%);
}
.hero__glow { position: absolute; border-radius: 50%; filter: blur(90px); pointer-events: none; }
.hero__glow--a {
  width: 520px; height: 520px; top: -180px; right: -120px;
  background: radial-gradient(circle, rgba(34, 211, 238, .36), transparent 68%);
}
.hero__glow--b {
  width: 480px; height: 480px; bottom: -220px; left: -140px;
  background: radial-gradient(circle, rgba(255, 122, 24, .22), transparent 70%);
}

.hero__inner {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.06fr .94fr;
  gap: 48px; align-items: center;
  padding-top: 18px; padding-bottom: 40px;
}

.pill {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px 7px 12px;
  border: 1px solid rgba(120, 190, 255, .28);
  border-radius: 999px;
  background: rgba(59, 130, 246, .12);
  font-size: 13.5px; font-weight: 500; color: #BFDBFE;
  margin-bottom: 26px;
}
.pill__dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--cyan-400);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, .7);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(34, 211, 238, .7); }
  70%  { box-shadow: 0 0 0 9px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

.hero__title {
  font-size: clamp(40px, 5.4vw, 68px);
  font-weight: 800; letter-spacing: -.025em; line-height: 1.1;
  margin-bottom: 22px;
}
.hero__sub {
  font-size: 17px; line-height: 1.85;
  color: rgba(226, 236, 255, .74);
  max-width: 560px;
  margin-bottom: 34px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }

.hero__trust { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; }
.hero__trust > span { color: rgba(200, 216, 245, .5); }
.hero__trust ul { display: flex; flex-wrap: wrap; gap: 8px; }
.hero__trust li {
  padding: 5px 12px; border-radius: 999px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  color: rgba(226, 236, 255, .8); font-size: 12.5px;
}

/* Hero 右侧视觉 */
.hero__art { position: relative; display: grid; place-items: center; }
.globe { width: 100%; max-width: 460px; height: auto; animation: spinSlow 46s linear infinite; }
@keyframes spinSlow { to { transform: rotate(360deg); } }

.globe__arcs path { stroke-dasharray: 300; animation: dash 7s linear infinite; }
.globe__arcs path:nth-child(2) { animation-duration: 9s; animation-delay: -3s; }
.globe__arcs path:nth-child(3) { animation-duration: 11s; animation-delay: -5s; }
@keyframes dash {
  0%   { stroke-dashoffset: 320; opacity: 0; }
  12%  { opacity: 1; }
  88%  { opacity: 1; }
  100% { stroke-dashoffset: -320; opacity: 0; }
}
.globe__pulse circle { animation: nodePulse 3s ease-out infinite; transform-origin: center; }
.globe__pulse circle:last-child { animation-delay: 1.5s; }
@keyframes nodePulse {
  0%   { opacity: .9; r: 3; }
  100% { opacity: 0; r: 16; }
}

.float-card {
  position: absolute;
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px;
  border-radius: 14px;
  background: rgba(15, 25, 45, .72);
  border: 1px solid rgba(120, 170, 255, .2);
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, .8);
  animation: floaty 6s ease-in-out infinite;
}
.float-card strong { display: block; font-size: 13px; color: #fff; font-weight: 600; }
.float-card small { display: block; font-size: 11.5px; color: rgba(190, 212, 245, .72); }
.float-card__dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--cyan-400);
  box-shadow: 0 0 10px rgba(34, 211, 238, .9); flex: none;
}
.float-card__dot--hot { background: var(--hot-500); box-shadow: 0 0 10px rgba(255, 122, 24, .9); }
.float-card--1 { top: 12%; left: -6%; animation-delay: 0s; }
.float-card--2 { top: 46%; right: -3%; animation-delay: 1.4s; }
.float-card--3 { bottom: 10%; left: -2%; animation-delay: 2.8s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-11px); }
}

/* 数据条：悬浮压边深色面板 */
.stats-band { position: relative; z-index: 6; margin-top: -60px; }
.stats {
  position: relative;
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 32px 12px;
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, #0C1730 0%, #101F42 52%, #0A1428 100%);
  border: 1px solid rgba(120, 170, 255, .24);
  box-shadow: 0 34px 80px -30px rgba(8, 22, 55, .62),
              inset 0 1px 0 rgba(255, 255, 255, .07);
  overflow: hidden;
}
.stats::before {
  content: ""; position: absolute; inset: 0 auto auto 0; width: 100%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, .55), rgba(255, 122, 24, .35), transparent);
}
.stat { text-align: center; padding: 0 12px; position: relative; }
.stat + .stat::before {
  content: ""; position: absolute; left: 0; top: 12%; height: 76%; width: 1px;
  background: linear-gradient(180deg, transparent, rgba(120, 170, 255, .3), transparent);
}
.stat b {
  display: block; font-size: clamp(28px, 3.4vw, 40px); font-weight: 800;
  letter-spacing: -.03em; line-height: 1.1;
  background: linear-gradient(120deg, #fff, #9FD8FF);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat b i { font-style: normal; font-size: .6em; }
.stat > span { display: block; margin-top: 6px; font-size: 13.5px; color: rgba(196, 214, 245, .68); }

/* =========================================================
   通用区块
   ========================================================= */
.section { padding: 104px 0; }
.section--tint { background: var(--bg-tint); }
.section--dark {
  background: radial-gradient(900px 480px at 12% 0%, #16264A 0%, transparent 62%),
              linear-gradient(180deg, #0A1020, #070B14);
  color: #fff;
}
/* 数据条下压，正文首块多留白 */
#services { padding-top: 128px; }

.sec-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.sec-tag {
  display: inline-block; margin-bottom: 14px;
  font-size: 12.5px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  color: var(--blue-600);
  padding: 5px 12px; border-radius: 999px; background: rgba(37, 99, 235, .08);
}
.sec-tag--light { color: var(--cyan-400); background: rgba(34, 211, 238, .12); }
.sec-title { font-size: clamp(28px, 3.6vw, 44px); font-weight: 800; letter-spacing: -.022em; margin-bottom: 16px; }
.sec-title--light { color: #fff; }
.sec-desc { font-size: 16.5px; color: var(--muted); line-height: 1.8; }
.section--dark .sec-desc { color: rgba(200, 216, 245, .68); }

/* =========================================================
   核心服务卡片
   ========================================================= */
.cards { display: grid; gap: 22px; }
.cards--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 30px 26px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: var(--grad-tech);
  transform: scaleX(0); transform-origin: left;
  transition: transform .45s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(59, 130, 246, .32); }
.card:hover::before { transform: scaleX(1); }

.card__icon {
  width: 46px; height: 46px; border-radius: 13px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, rgba(37, 99, 235, .1), rgba(34, 211, 238, .14));
  border: 1px solid rgba(37, 99, 235, .14);
  margin-bottom: 18px;
}
.card__icon svg {
  width: 23px; height: 23px; fill: none;
  stroke: var(--blue-600); stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round;
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.75; }
.card__list { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); display: grid; gap: 7px; }
.card__list li {
  font-size: 13px; color: var(--muted);
  padding-left: 16px; position: relative;
}
.card__list li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--blue-400);
}

/* =========================================================
   行业解决方案
   ========================================================= */
.solutions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.solution {
  position: relative;
  display: flex; flex-direction: column;
  padding: 30px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
}
.solution:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(34, 211, 238, .4); }
.solution__badge {
  font-size: 12px; font-weight: 800; letter-spacing: .1em;
  color: transparent;
  background: var(--grad-tech); -webkit-background-clip: text; background-clip: text;
  margin-bottom: 12px;
}
.solution h3 { font-size: 19px; margin-bottom: 9px; }
.solution p { font-size: 14.5px; color: var(--muted); margin-bottom: 18px; }
.solution__tags { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px; }
.solution__tags span {
  font-size: 12.5px; padding: 4.5px 11px; border-radius: 999px;
  background: rgba(37, 99, 235, .07);
  border: 1px solid rgba(37, 99, 235, .12);
  color: var(--blue-600); font-weight: 500;
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.solution:hover .solution__tags span { background: rgba(34, 211, 238, .13); }

/* =========================================================
   服务流程
   ========================================================= */
.flow {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 20px; position: relative;
}
.flow::before {
  content: ""; position: absolute; top: 27px; left: 6%; right: 6%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, .3) 12%, rgba(34, 211, 238, .42) 50%, rgba(37, 99, 235, .3) 88%, transparent);
}
.flow__item { position: relative; padding-top: 66px; }
.flow__num {
  position: absolute; top: 0; left: 0;
  width: 54px; height: 54px; border-radius: 16px;
  display: grid; place-items: center;
  font-size: 15px; font-weight: 800; letter-spacing: .02em;
  background: #fff; color: var(--blue-600);
  border: 1px solid rgba(37, 99, 235, .18);
  box-shadow: 0 10px 28px -14px rgba(37, 99, 235, .5);
  transition: transform .35s var(--ease), background .35s var(--ease), color .35s var(--ease);
}
.flow__item:hover .flow__num { transform: translateY(-4px); background: var(--grad-tech); color: #fff; border-color: transparent; }
.flow__item h3 { font-size: 17.5px; margin-bottom: 9px; }
.flow__item p { font-size: 14px; color: var(--muted); line-height: 1.75; }

/* =========================================================
   关于我们（深色）
   ========================================================= */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about__copy .sec-title { margin-bottom: 22px; }
.about__copy p {
  font-size: 16px; line-height: 1.9;
  color: rgba(206, 220, 246, .74);
  margin-bottom: 18px;
}
.about__copy strong { color: #fff; font-weight: 700; }
.about__quote {
  margin-top: 28px; padding: 20px 24px;
  border-left: 3px solid transparent;
  border-image: var(--grad-hot) 1;
  background: rgba(255, 255, 255, .045);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 16.5px; font-weight: 600; color: #E7F1FF;
  display: flex; gap: 10px;
}
.about__quote span { color: var(--hot-500); font-size: 26px; line-height: 1; font-family: Georgia, serif; }

.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.adv {
  padding: 24px 22px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .045);
  border: 1px solid rgba(140, 180, 255, .14);
  transition: background .3s var(--ease), transform .3s var(--ease), border-color .3s var(--ease);
}
.adv:hover { background: rgba(59, 130, 246, .12); transform: translateY(-4px); border-color: rgba(34, 211, 238, .38); }
.adv h3 { font-size: 16.5px; color: #fff; margin-bottom: 9px; }
.adv h3::before {
  content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan-400); margin-right: 9px; vertical-align: middle;
  box-shadow: 0 0 9px rgba(34, 211, 238, .9);
}
.adv p { font-size: 13.8px; line-height: 1.8; color: rgba(196, 214, 245, .66); }

/* =========================================================
   案例
   ========================================================= */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case {
  display: flex; flex-direction: column;
  padding: 30px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case__top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.case__cat {
  font-size: 12px; font-weight: 600; color: var(--blue-600);
  padding: 5px 12px; border-radius: 999px; background: rgba(37, 99, 235, .08);
}
.case__period { font-size: 12.5px; color: var(--muted); }
.case h3 { font-size: 19px; margin-bottom: 12px; }
.case > p { font-size: 14.5px; color: var(--ink-2); line-height: 1.78; margin-bottom: 22px; }
.case__metrics {
  margin-top: auto; padding-top: 20px;
  border-top: 1px solid var(--line);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px;
}
.case__metrics b {
  display: block; font-size: 21px; font-weight: 800; letter-spacing: -.02em;
  background: var(--grad-tech); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.case__metrics span { display: block; font-size: 12px; color: var(--muted); margin-top: 3px; }

/* =========================================================
   联系
   ========================================================= */
.contact { display: grid; grid-template-columns: 1fr 1.02fr; gap: 52px; align-items: start; }
.contact__lead { font-size: 16px; color: var(--muted); line-height: 1.85; margin: 18px 0 34px; max-width: 460px; }
.contact__list { display: grid; gap: 18px; }
.contact__list li { display: flex; align-items: flex-start; gap: 14px; }
.ci {
  flex: none; width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  background: #fff; border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.ci svg { width: 20px; height: 20px; fill: none; stroke: var(--blue-600); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.contact__list small { display: block; font-size: 12.5px; color: var(--muted); margin-bottom: 2px; }
.contact__list a, .contact__list span { font-size: 15.5px; font-weight: 600; color: var(--ink); }
.contact__list a:hover { color: var(--blue-600); }

.contact__assure {
  margin-top: 32px; padding: 22px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
}
.contact__assure h4 { font-size: 14.5px; color: var(--ink); margin-bottom: 14px; }
.contact__assure ul { display: grid; gap: 11px; }
.contact__assure li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink-2); }
.contact__assure li svg {
  width: 17px; height: 17px; flex: none; color: var(--blue-600);
  fill: none; stroke: currentColor; stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
}

.contact__form {
  padding: 36px 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-md);
}
.contact__form h3 { font-size: 21px; margin-bottom: 8px; }
.form__hint { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.form__hint i, .field label i { color: #EF4444; font-style: normal; }

.field { margin-bottom: 17px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: #FAFBFE;
  font-size: 15px;
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease);
  outline: none;
}
.field textarea { resize: vertical; min-height: 88px; }
.field input::placeholder, .field textarea::placeholder { color: #A6B2C9; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--blue-500);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, .12);
}
.field.has-error input, .field.has-error textarea { border-color: #F87171; background: #FEF6F6; }
.field__err { display: none; margin-top: 6px; font-size: 12.5px; color: #DC2626; }
.field.has-error .field__err { display: block; }

.contact__form .btn { margin-top: 8px; }
.form__ok { display: none; margin-top: 16px; font-size: 14px; font-weight: 600; color: #059669; }
.form__ok.is-show { display: block; }

/* =========================================================
   页脚
   ========================================================= */
.footer {
  background: linear-gradient(180deg, #070B14, #05080F);
  color: rgba(200, 216, 245, .7);
  padding: 68px 0 30px;
}
.footer__inner { display: grid; grid-template-columns: 1.1fr 2fr; gap: 48px; padding-bottom: 44px; }
.footer .brand__mark { color: #fff; }
.footer .brand__text strong { color: #fff; }
.footer .brand__text i { color: rgba(200, 216, 245, .72); }
.footer .brand__text em { color: rgba(200, 216, 245, .45); }
.footer__brand > p { margin-top: 18px; font-size: 14.5px; color: rgba(200, 216, 245, .55); }

.footer__nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.footer__nav h4 { font-size: 14px; color: #fff; margin-bottom: 16px; letter-spacing: .02em; }
.footer__nav a, .footer__nav span {
  display: block; font-size: 14px; color: rgba(200, 216, 245, .6);
  margin-bottom: 10px; transition: color .22s var(--ease);
}
.footer__nav a:hover { color: var(--cyan-400); }

.footer__bottom {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 13px; color: rgba(200, 216, 245, .42);
}

/* 回到顶部 */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  display: grid; place-items: center;
  background: #fff; color: var(--blue-600);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--grad-tech); color: #fff; border-color: transparent; }

/* =========================================================
   入场动画
   ========================================================= */
[data-reveal] {
  opacity: 0; transform: translateY(26px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .cards--4 { grid-template-columns: repeat(2, 1fr); }
  .solutions, .cases { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(3, 1fr); row-gap: 34px; }
  .flow::before { display: none; }
  .hero__inner { gap: 24px; }
  .about { grid-template-columns: 1fr; gap: 44px; }
}

@media (max-width: 900px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 16px 24px 26px;
    background: rgba(9, 14, 26, .97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(255, 255, 255, .09);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity .3s var(--ease), transform .3s var(--ease);
  }
  .nav__links.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__links > a { padding: 13px 14px; font-size: 16px; color: rgba(255, 255, 255, .85) !important; border-radius: 12px; }
  .nav__links > a:hover { background: rgba(255, 255, 255, .07); color: #fff !important; }
  .nav__cta { margin: 10px 0 0; justify-content: center; }
  .nav.is-scrolled .nav__links { background: rgba(255, 255, 255, .98); }

  .hero { padding-top: calc(var(--nav-h) + 46px); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__art { order: -1; max-width: 380px; margin: 0 auto 8px; }
  .float-card--1 { left: -8%; }
  .float-card--2 { right: -4%; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 26px 0; }
  .stat:nth-child(3)::before, .stat:nth-child(1)::before { display: none; }
  .stats-band { margin-top: -44px; }
  .section { padding: 82px 0; }
  #services { padding-top: 100px; }
  .contact { grid-template-columns: 1fr; gap: 40px; }
  .footer__inner { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 620px) {
  .container { padding: 0 18px; }
  .brand { gap: 9px; }
  .brand__mark svg { width: 38px; height: 38px; }
  .brand__text strong { font-size: 17px; }
  .brand__text i { font-size: 12px; }
  .brand__text em { font-size: 8px; letter-spacing: .16em; }
  .cards--4, .solutions, .cases, .flow { grid-template-columns: 1fr; }
  .about__grid { grid-template-columns: 1fr; }
  .hero__title { font-size: 38px; }
  .hero__sub { font-size: 15.5px; }
  .hero__actions .btn { width: 100%; }
  .sec-head { margin-bottom: 40px; }
  .contact__form { padding: 28px 22px; }
  .footer__nav { grid-template-columns: 1fr 1fr; }
  .case__metrics { grid-template-columns: repeat(3, 1fr); }
  .float-card { display: none; }
  .globe { max-width: 300px; }
}

/* 无动画偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}