/* =========================================================
   湘西康远 · 信息化系统集成官网
   样式表 | 纯 CSS，无框架依赖
   目录：
   01 设计令牌与基础重置
   02 通用组件（容器 / 按钮 / 标题 / 动画）
   03 导航
   04 首屏 Hero
   05 痛点
   06 解决方案
   07 服务能力
   08 服务流程
   09 数据统计
   10 成功案例
   11 关于我们
   12 联系我们（表单）
   13 页脚 / 返回顶部 / 提示
   14 响应式
   ========================================================= */

/* ---------- 01 设计令牌 ---------- */
:root {
  /* 色彩 */
  --navy-900: #061726;
  --navy-800: #0B2A4A;
  --navy-700: #123A63;
  --primary: #1273D4;
  --primary-600: #0B5FA5;
  --sky: #0EA5E9;
  --cyan: #38BDF8;
  --cta: #F97316;
  --cta-hover: #E4660A;

  --ink: #0C2A47;
  --body: #4A6584;
  --muted: #7089A0;

  --bg: #FFFFFF;
  --soft: #F1F7FD;
  --soft-2: #E6F1FB;
  --line: #DCE8F5;
  --line-strong: #C6DCEF;

  /* 深色区块内的文字 */
  --on-dark: #FFFFFF;
  --on-dark-2: rgba(255, 255, 255, 0.74);
  --on-dark-3: rgba(255, 255, 255, 0.5);
  --dark-line: rgba(255, 255, 255, 0.14);

  /* 圆角 */
  --r-xs: 8px;
  --r-sm: 12px;
  --r: 16px;
  --r-lg: 22px;
  --r-xl: 30px;

  /* 阴影 */
  --sh-xs: 0 1px 2px rgba(11, 42, 74, 0.06);
  --sh-sm: 0 2px 8px rgba(11, 42, 74, 0.06);
  --sh: 0 10px 30px -12px rgba(11, 42, 74, 0.18);
  --sh-lg: 0 26px 60px -22px rgba(11, 42, 74, 0.28);
  --sh-glow: 0 18px 40px -16px rgba(18, 115, 212, 0.5);

  /* 尺寸 */
  --container: 1200px;
  --nav-h: 76px;

  /* 字体 */
  --font: "Lexend", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: "Lexend", "Segoe UI", system-ui, sans-serif;

  /* 过渡 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t: 220ms;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

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

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

::selection { background: rgba(18, 115, 212, 0.18); }

:focus-visible {
  outline: 3px solid rgba(18, 115, 212, 0.55);
  outline-offset: 2px;
  border-radius: 6px;
}
.section--dark :focus-visible { outline-color: var(--cyan); }

.skip-link {
  position: absolute;
  left: 50%;
  top: -100px;
  transform: translateX(-50%);
  z-index: 200;
  padding: 10px 20px;
  background: var(--navy-800);
  color: #fff;
  border-radius: 0 0 12px 12px;
  transition: top var(--t) var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 02 通用 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section--dark {
  background:
    radial-gradient(1100px 520px at 12% -10%, rgba(14, 165, 233, 0.20), transparent 60%),
    radial-gradient(900px 520px at 92% 110%, rgba(18, 115, 212, 0.22), transparent 62%),
    linear-gradient(160deg, var(--navy-800) 0%, var(--navy-900) 100%);
  color: var(--on-dark-2);
}
.section--dark .section__title,
.section--dark h3 { color: var(--on-dark); }

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

.section__title {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
}

.section__lead { font-size: 16.5px; color: var(--body); }
.section__lead--dark { color: var(--on-dark-2); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
}
.eyebrow--dark { color: var(--cyan); }
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.22);
  animation: pulse 2.4s var(--ease) infinite;
}

/* 按钮 */
.btn {
  --btn-bg: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease),
    border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
    transform var(--t) var(--ease);
}
.btn svg { transition: transform var(--t) var(--ease); flex: none; }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--cta);
  color: #fff;
  box-shadow: 0 10px 24px -10px rgba(249, 115, 22, 0.7);
}
.btn--primary:hover { background: var(--cta-hover); transform: translateY(-1px); }
.btn--primary:active { transform: translateY(0); }

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

.btn--ghost-dark {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.28);
}
.btn--ghost-dark:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--sm { padding: 10px 18px; font-size: 14px; }
.btn--lg { padding: 16px 30px; font-size: 16px; }
.btn--block { width: 100%; }

/* 滚动进场（仅在 JS 可用时隐藏，保证无 JS 环境内容可见） */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  transition-delay: var(--delay, 0ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  inset: 0 auto auto 0;
  height: 3px;
  width: 0;
  z-index: 120;
  background: linear-gradient(90deg, var(--sky), var(--primary) 60%, var(--cta));
  transition: width 120ms linear;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.22); }
  50%      { box-shadow: 0 0 0 8px rgba(56, 189, 248, 0.05); }
}
@keyframes dash { to { stroke-dashoffset: -60; } }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* ---------- 03 导航 ---------- */
.nav {
  position: fixed;
  top: 14px;
  left: 0;
  right: 0;
  z-index: 110;
  padding: 0 20px;
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  height: 66px;
  padding: 0 12px 0 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
  transition: background-color 320ms var(--ease), box-shadow 320ms var(--ease),
    border-color 320ms var(--ease), backdrop-filter 320ms var(--ease);
}

.nav.is-stuck .nav__inner {
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-color: var(--line);
  box-shadow: 0 12px 34px -18px rgba(11, 42, 74, 0.34);
}

.brand { display: inline-flex; align-items: center; gap: 11px; flex: none; }
.brand__mark { display: block; line-height: 0; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text strong {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.01em;
  transition: color var(--t) var(--ease);
}
.brand__text em {
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--t) var(--ease);
}
.nav.is-stuck .brand__text strong { color: var(--ink); }
.nav.is-stuck .brand__text em { color: var(--muted); }

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.nav__menu a {
  position: relative;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.nav__menu a:hover { color: #fff; background: rgba(255, 255, 255, 0.1); }
.nav__menu a.is-active { color: #fff; }
.nav__menu a.is-active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 2px;
  width: 16px; height: 2px;
  transform: translateX(-50%);
  border-radius: 2px;
  background: var(--cyan);
}
.nav.is-stuck .nav__menu a { color: var(--body); }
.nav.is-stuck .nav__menu a:hover { color: var(--primary); background: var(--soft); }
.nav.is-stuck .nav__menu a.is-active { color: var(--primary); }
.nav.is-stuck .nav__menu a.is-active::after { background: var(--primary); }

.nav__cta-mobile { display: none; }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.nav__phone {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  transition: color var(--t) var(--ease);
}
.nav__phone:hover { color: var(--cyan); }
.nav.is-stuck .nav__phone { color: var(--ink); }
.nav.is-stuck .nav__phone:hover { color: var(--primary); }

.nav__toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 12px;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.24);
}
.nav__toggle span {
  position: absolute;
  left: 11px; right: 11px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform 280ms var(--ease), opacity 200ms var(--ease),
    background-color var(--t) var(--ease);
}
.nav__toggle span:nth-child(1) { top: 14px; }
.nav__toggle span:nth-child(2) { top: 20px; }
.nav__toggle span:nth-child(3) { top: 26px; }
.nav.is-stuck .nav__toggle { border-color: var(--line-strong); }
.nav.is-stuck .nav__toggle span { background: var(--ink); }

.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 04 首屏 ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 76px) 0 76px;
  background: linear-gradient(165deg, #0D3457 0%, var(--navy-800) 42%, var(--navy-900) 100%);
  color: var(--on-dark-2);
  overflow: hidden;
  isolation: isolate;
}

.hero__bg { position: absolute; inset: 0; z-index: -1; }
.hero__grid {
  position: absolute;
  inset: -2px;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: radial-gradient(115% 85% at 50% 0%, #000 30%, transparent 78%);
  mask-image: radial-gradient(115% 85% at 50% 0%, #000 30%, transparent 78%);
}
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.hero__glow--a {
  width: 620px; height: 620px;
  top: -240px; left: -140px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.55), transparent 68%);
}
.hero__glow--b {
  width: 560px; height: 560px;
  right: -180px; top: 40px;
  background: radial-gradient(circle, rgba(18, 115, 212, 0.6), transparent 68%);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  gap: 56px;
  align-items: center;
}

.hero__title {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: #fff;
  margin: 20px 0 22px;
}
.hero__title .grad {
  background: linear-gradient(96deg, #7DD3FC 0%, #38BDF8 40%, #FBBF24 118%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  font-size: 17px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.76);
  max-width: 620px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 34px 0 30px;
}

.hero__points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.7);
}
.hero__points li { display: inline-flex; align-items: center; gap: 8px; }
.hero__points svg { color: var(--cyan); flex: none; }

/* Hero 示意图 */
.hero__art {
  position: relative;
  padding: 10px;
}
.topology { width: 100%; height: auto; overflow: visible; }

.topology .ring {
  fill: none;
  stroke: rgba(125, 211, 252, 0.16);
  stroke-width: 1.2;
  stroke-dasharray: 5 9;
}
.topology .ring--2 { stroke: rgba(125, 211, 252, 0.22); }
.topology .ring--3 { stroke: rgba(125, 211, 252, 0.28); }

.topology .link {
  fill: none;
  stroke: url(#linkGrad);
  stroke-width: 1.6;
  stroke-dasharray: 7 7;
  animation: dash 3.4s linear infinite;
}
.topology .hub { filter: drop-shadow(0 18px 28px rgba(3, 18, 34, 0.55)); }
.topology .hub-glow { animation: glowPulse 4.4s var(--ease) infinite; }
@keyframes glowPulse {
  0%, 100% { opacity: 0.5; }
  50%      { opacity: 1; }
}
.topology .hub-label {
  fill: rgba(255, 255, 255, 0.66);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  font-family: var(--font);
}
.topology .node circle {
  fill: rgba(11, 42, 74, 0.72);
  stroke: rgba(125, 211, 252, 0.5);
  stroke-width: 1.4;
  animation: nodeFade 3.6s var(--ease) infinite;
  animation-delay: var(--d);
}
.topology .node text {
  fill: #E0F2FE;
  font-size: 14px;
  font-weight: 600;
  text-anchor: middle;
  font-family: var(--font);
  animation: nodeFade 3.6s var(--ease) infinite;
  animation-delay: var(--d);
}
@keyframes nodeFade {
  0%, 100% { opacity: 0.72; }
  45%      { opacity: 1; }
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 40px -20px rgba(3, 18, 34, 0.8);
  animation: floaty 6s var(--ease) infinite;
  white-space: nowrap;
}
.floating-card div { display: flex; flex-direction: column; line-height: 1.3; }
.floating-card strong { font-size: 12px; font-weight: 500; color: rgba(255, 255, 255, 0.66); }
.floating-card em {
  font-style: normal;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-num);
}
.floating-card__dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: #4ADE80;
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.22);
  flex: none;
}
.floating-card--a { left: -6px; top: 26%; animation-delay: 0.6s; }
.floating-card--b { right: -6px; bottom: 16%; }

/* 信任栏 */
.trustbar {
  margin-top: 76px;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  gap: 26px;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--dark-line);
}
.trustbar__label {
  flex: none;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--on-dark-3);
  padding-right: 26px;
  border-right: 1px solid var(--dark-line);
}
.trustbar__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  font-size: 15px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
}
.trustbar__list li {
  padding-left: 16px;
  position: relative;
}
.trustbar__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 6px; height: 6px;
  margin-top: -3px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: 0.75;
  transform: rotate(45deg);
}

/* ---------- 05 痛点 ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.pain {
  position: relative;
  padding: 30px 26px 28px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  overflow: hidden;
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease),
    border-color var(--t) var(--ease);
}
.pain::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sky), var(--primary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 380ms var(--ease);
}
.pain:hover { transform: translateY(-5px); box-shadow: var(--sh); border-color: var(--line-strong); }
.pain:hover::after { transform: scaleX(1); }

.pain__no {
  display: block;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--sky);
  margin-bottom: 14px;
}
.pain h3 { font-size: 17.5px; margin-bottom: 10px; }
.pain p { font-size: 14.5px; line-height: 1.8; color: var(--body); }

/* ---------- 06 解决方案 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.sol-card {
  position: relative;
  padding: 32px 28px 28px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  overflow: hidden;
  cursor: pointer;
  transition: transform 260ms var(--ease), box-shadow 260ms var(--ease),
    border-color 260ms var(--ease);
}
.sol-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sky), var(--primary) 70%, var(--cta));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 420ms var(--ease);
}
.sol-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--sh-lg);
  border-color: transparent;
}
.sol-card:hover::before { transform: scaleX(1); }

.sol-card__icon {
  width: 54px; height: 54px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: var(--primary);
  background: linear-gradient(140deg, var(--soft-2), #F5FAFF);
  border: 1px solid var(--line);
  margin-bottom: 20px;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease),
    border-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.sol-card:hover .sol-card__icon {
  background: linear-gradient(140deg, var(--primary), var(--sky));
  border-color: transparent;
  color: #fff;
  transform: translateY(-2px);
}

.sol-card h3 { font-size: 19px; margin-bottom: 12px; }
.sol-card > p { font-size: 14.6px; line-height: 1.8; color: var(--body); min-height: 78px; }

.sol-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}
.sol-card__tags li {
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--primary-600);
  background: var(--soft-2);
}

/* ---------- 07 服务能力 ---------- */
.cap {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 60px;
  align-items: start;
}

.cap__list { margin-top: 36px; display: grid; gap: 4px; }
.cap__list li {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--dark-line);
}
.cap__list li:last-child { border-bottom: 1px solid var(--dark-line); }
.cap__ico {
  flex: none;
  width: 40px; height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.24);
}
.cap__list strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 3px;
}
.cap__list em {
  font-style: normal;
  font-size: 14.2px;
  color: var(--on-dark-2);
  line-height: 1.7;
}

.stack-card {
  padding: 34px 32px;
  border-radius: var(--r-xl);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--dark-line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.8);
}
.stack-card__title {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.04em;
  padding-bottom: 20px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--dark-line);
}
.stack-group {
  padding: 20px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}
.stack-group:last-child { border-bottom: 0; padding-bottom: 0; }
.stack-group__name {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin-bottom: 12px;
}
.stack-group ul { display: flex; flex-wrap: wrap; gap: 8px; }
.stack-group li {
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: background-color var(--t) var(--ease), border-color var(--t) var(--ease),
    transform var(--t) var(--ease);
}
.stack-group li:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-2px);
}

/* ---------- 08 服务流程 ---------- */
.timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding-left: 0;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--sky), var(--primary) 70%, rgba(18, 115, 212, 0.15));
  opacity: 0.4;
}
.step {
  position: relative;
  display: flex;
  gap: 28px;
  padding: 0 0 22px;
}
.step:last-child { padding-bottom: 0; }

.step__num {
  position: relative;
  z-index: 1;
  flex: none;
  width: 62px; height: 62px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  background: #fff;
  border: 1px solid var(--line-strong);
  box-shadow: 0 0 0 8px var(--soft), var(--sh-sm);
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease),
    box-shadow var(--t) var(--ease), transform var(--t) var(--ease);
}
.step:hover .step__num {
  background: linear-gradient(140deg, var(--primary), var(--sky));
  border-color: transparent;
  color: #fff;
  transform: scale(1.04);
  box-shadow: 0 0 0 8px var(--soft), var(--sh-glow);
}

.step__body {
  flex: 1;
  margin-top: 6px;
  padding: 24px 26px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease),
    border-color var(--t) var(--ease);
}
.step:hover .step__body {
  transform: translateX(6px);
  box-shadow: var(--sh);
  border-color: var(--line-strong);
}
.step__body h3 { font-size: 18px; margin-bottom: 8px; }
.step__body p { font-size: 14.6px; line-height: 1.8; color: var(--body); }
.step__out {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 14px;
  padding: 5px 13px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--primary-600);
  background: var(--soft-2);
}
.step__out::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--sky);
}

/* ---------- 09 数据统计 ---------- */
.stats {
  position: relative;
  padding: 68px 0;
  background: linear-gradient(120deg, var(--primary-600) 0%, var(--navy-800) 55%, var(--navy-900) 100%);
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(90% 130% at 50% 50%, #000, transparent 80%);
  mask-image: radial-gradient(90% 130% at 50% 50%, #000, transparent 80%);
}
.stats__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.stat {
  text-align: center;
  padding: 22px 12px;
  border-radius: var(--r);
  transition: background-color var(--t) var(--ease);
}
.stat:hover { background: rgba(255, 255, 255, 0.06); }
.stat strong {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-num);
  font-size: clamp(34px, 4.4vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: #fff;
}
.stat strong em {
  font-style: normal;
  font-size: 0.5em;
  font-weight: 600;
  color: var(--cyan);
}
.stat > span {
  display: block;
  margin-top: 12px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.66);
}

/* ---------- 10 案例 ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}
.filter {
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--body);
  background: #fff;
  border: 1px solid var(--line);
  transition: color var(--t) var(--ease), background-color var(--t) var(--ease),
    border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.filter:hover { color: var(--primary); border-color: var(--line-strong); }
.filter.is-active {
  color: #fff;
  background: var(--navy-800);
  border-color: var(--navy-800);
  box-shadow: 0 10px 24px -14px rgba(11, 42, 74, 0.8);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.case-card {
  display: flex;
  flex-direction: column;
  padding: 28px 26px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease),
    box-shadow var(--t) var(--ease), border-color var(--t) var(--ease);
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--sh-lg);
  border-color: var(--line-strong);
}
.case-card.is-hidden { display: none; }
.case-card.is-enter { animation: cardIn 420ms var(--ease) both; }
@keyframes cardIn {
  from { opacity: 0; transform: translateY(14px) scale(0.985); }
  to   { opacity: 1; transform: none; }
}

.case-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.tag {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary-600);
  background: var(--soft-2);
}
.case-card__scale {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}
.case-card h3 {
  font-size: 17.5px;
  line-height: 1.55;
  margin-bottom: 12px;
}
.case-card > p {
  font-size: 14.4px;
  line-height: 1.8;
  color: var(--body);
  flex: 1;
}
.case-card__metrics {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}
.case-card__metrics li {
  flex: 1;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  background: var(--soft);
  transition: background-color var(--t) var(--ease);
}
.case-card:hover .case-card__metrics li { background: var(--soft-2); }
.case-card__metrics strong {
  display: block;
  font-family: var(--font-num);
  font-size: 21px;
  font-weight: 700;
  color: var(--primary-600);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.case-card__metrics span {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  color: var(--body);
}

.cases__note {
  margin-top: 32px;
  font-size: 13.5px;
  color: var(--muted);
  text-align: center;
}

/* ---------- 11 关于我们 ---------- */
.why {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}
.why__quote {
  margin-top: 32px;
  padding: 24px 26px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sky);
  box-shadow: var(--sh-xs);
}
.why__quote p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  font-weight: 500;
}
.why__quote span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}

.why__list { display: grid; gap: 14px; }
.why-item {
  display: flex;
  gap: 18px;
  padding: 24px 26px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease),
    border-color var(--t) var(--ease);
}
.why-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh);
  border-color: var(--line-strong);
}
.why-item__ico {
  flex: none;
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: var(--primary);
  background: var(--soft-2);
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease);
}
.why-item:hover .why-item__ico { background: var(--primary); color: #fff; }
.why-item h3 { font-size: 16.5px; margin-bottom: 6px; }
.why-item p { font-size: 14.4px; line-height: 1.78; color: var(--body); }

/* ---------- 12 联系我们 ---------- */
.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 60px;
  align-items: start;
}

.contact-person {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 32px 0 26px;
  padding: 18px 22px;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--dark-line);
}
.contact-person__avatar {
  flex: none;
  width: 52px; height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(140deg, var(--primary), var(--sky));
  box-shadow: 0 12px 26px -12px rgba(14, 165, 233, 0.9);
}
.contact-person__body { display: flex; flex-direction: column; line-height: 1.4; }
.contact-person__body strong { font-size: 19px; font-weight: 700; color: #fff; }
.contact-person__body span { font-size: 13.5px; color: var(--on-dark-2); }

.contact-list { display: grid; gap: 2px; }
.contact-list > li {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--dark-line);
}
.contact-list > li:first-child { border-top: 1px solid var(--dark-line); }
.contact-list__ico {
  flex: none;
  width: 42px; height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.24);
}
.contact-list em {
  display: block;
  font-style: normal;
  font-size: 12.5px;
  color: var(--on-dark-3);
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}
.contact-list strong,
.contact-list a {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  transition: color var(--t) var(--ease);
}
.contact-list a:hover { color: var(--cyan); }

.copy-wechat {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px 6px 14px;
  margin-left: -14px;
  border-radius: 999px;
  border: 1px dashed rgba(56, 189, 248, 0.45);
  background: rgba(56, 189, 248, 0.08);
  transition: background-color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.copy-wechat:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: rgba(56, 189, 248, 0.8);
}
.copy-wechat strong { font-family: var(--font-num); letter-spacing: 0.1em; }
.copy-wechat__hint {
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--navy-900);
  background: var(--cyan);
}
.copy-wechat.is-copied { border-style: solid; border-color: #4ADE80; background: rgba(74, 222, 128, 0.16); }
.copy-wechat.is-copied .copy-wechat__hint { background: #4ADE80; }

/* 微信二维码卡片 */
.qr-card {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
  padding: 16px;
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--sh-md);
  max-width: 420px;
}
.qr-card__img {
  flex: none;
  padding: 6px;
  border-radius: 14px;
  background: #F0FDF4;
}
.qr-card__img img {
  display: block;
  width: 148px;
  height: 148px;
  object-fit: cover;          /* 裁掉原图上下留白，聚焦二维码区域 */
  border-radius: 10px;
}
.qr-card__body { display: grid; gap: 4px; }
.qr-card__body strong { font-size: 16px; color: var(--navy-900); }
.qr-card__body span { font-size: 13.5px; color: var(--muted); }
.qr-card__body em {
  font-style: normal;
  font-size: 12.5px;
  color: #16A34A;
  font-weight: 600;
}

/* 表单 */
.form-card {
  position: relative;
  padding: 38px 36px 34px;
  border-radius: var(--r-xl);
  background: #fff;
  box-shadow: var(--sh-lg);
}
.form-card__title { font-size: 22px; margin-bottom: 8px; }
.form-card__sub { font-size: 14px; color: var(--muted); margin-bottom: 26px; }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.field label i { font-style: normal; color: var(--cta); }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 13px 15px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-strong);
  background: #FBFDFF;
  font-size: 15px;
  color: var(--ink);
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
    background-color var(--t) var(--ease);
}
.field textarea { resize: vertical; min-height: 104px; line-height: 1.7; }
.field input::placeholder,
.field textarea::placeholder { color: #9FB3C8; }
.field input:hover,
.field select:hover,
.field textarea:hover { border-color: var(--primary); }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(18, 115, 212, 0.14);
}
.field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234A6584' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 17px;
  padding-right: 42px;
  cursor: pointer;
}

.field__err {
  display: none;
  margin-top: 6px;
  font-size: 12.8px;
  font-weight: 500;
  color: #DC2626;
}
.field.has-error input,
.field.has-error textarea { border-color: #F87171; background: #FEF4F4; }
.field.has-error .field__err { display: block; }
.field.has-error input:focus { box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.12); }

.form-card__tip {
  margin-top: 16px;
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
}

.form-success[hidden] { display: none; }
.form-success {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 40px;
  border-radius: var(--r-xl);
  background: #fff;
  animation: cardIn 380ms var(--ease) both;
}
.form-success h4 { font-size: 21px; }
.form-success p { font-size: 14.5px; color: var(--body); max-width: 320px; }
.form-success strong { color: var(--primary-600); font-family: var(--font-num); letter-spacing: 0.06em; }
.form-success .btn { margin-top: 10px; }

/* ---------- 13 页脚 / 返回顶部 / 提示 ---------- */
.footer {
  padding: 68px 0 34px;
  background: var(--navy-900);
  color: var(--on-dark-2);
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.5fr);
  gap: 54px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--dark-line);
}
.brand--footer .brand__text strong { color: #fff; }
.brand--footer .brand__text em { color: var(--on-dark-3); }
.footer__brand p {
  margin-top: 18px;
  font-size: 14.2px;
  line-height: 1.85;
  color: var(--on-dark-2);
  max-width: 380px;
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}
.footer__nav h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}
.footer__nav ul { display: grid; gap: 11px; }
.footer__nav li,
.footer__nav a {
  font-size: 14px;
  color: var(--on-dark-2);
  transition: color var(--t) var(--ease);
}
.footer__nav a:hover { color: var(--cyan); }
.footer__nav strong { color: #fff; font-family: var(--font-num); letter-spacing: 0.08em; }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 26px;
  font-size: 13.2px;
  color: var(--on-dark-3);
}
.footer__meta { opacity: 0.75; }

.to-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  z-index: 100;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  background: var(--navy-800);
  box-shadow: var(--sh);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease),
    visibility var(--t), background-color var(--t) var(--ease);
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--primary); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 200;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
  background: rgba(11, 42, 74, 0.94);
  box-shadow: var(--sh-lg);
  opacity: 0;
  transform: translate(-50%, 16px);
  pointer-events: none;
  transition: opacity 280ms var(--ease), transform 280ms var(--ease);
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 14 响应式 ---------- */
@media (max-width: 1080px) {
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
  .hero__art { max-width: 520px; margin: 0 auto; width: 100%; }
  .cap { grid-template-columns: 1fr; gap: 44px; }
  .why { grid-template-columns: 1fr; gap: 44px; }
  .contact { grid-template-columns: 1fr; gap: 44px; }
  .card-grid,
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__top { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 860px) {
  .nav { padding: 0 12px; }

  .nav__menu {
    position: fixed;
    left: 12px;
    right: 12px;
    top: 92px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 14px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--sh-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px) scale(0.98);
    transform-origin: top center;
    transition: opacity 240ms var(--ease), transform 240ms var(--ease),
      visibility 240ms;
  }
  .nav.is-open .nav__menu {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav__menu a,
  .nav.is-stuck .nav__menu a {
    padding: 13px 16px;
    border-radius: 14px;
    font-size: 15.5px;
    color: var(--ink);
  }
  .nav__menu a:hover,
  .nav.is-stuck .nav__menu a:hover { background: var(--soft); color: var(--primary); }
  .nav__menu a.is-active,
  .nav.is-stuck .nav__menu a.is-active { color: var(--primary); background: var(--soft); }
  .nav__menu a.is-active::after { display: none; }
  .nav__cta-mobile {
    display: flex;
    margin-top: 8px;
    justify-content: center;
    color: #fff !important;
  }
  .nav__phone { display: none; }
  .nav__actions { margin-left: auto; }
  .nav__actions .btn { display: none; }
  .nav__toggle { display: block; }

  .nav.is-stuck .nav__toggle span { background: var(--ink); }

  body.nav-locked { overflow: hidden; }
}

@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .hero { padding-top: calc(var(--nav-h) + 48px); padding-bottom: 56px; }
  .container { padding: 0 18px; }

  .card-grid,
  .case-grid,
  .pain-grid { grid-template-columns: 1fr; }

  .stats__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .stat { padding: 18px 8px; }

  .trustbar { flex-direction: column; align-items: flex-start; gap: 16px; padding: 20px; }
  .trustbar__label { padding-right: 0; padding-bottom: 14px; border-right: 0; border-bottom: 1px solid var(--dark-line); width: 100%; }
  .trustbar__list { gap: 8px 20px; font-size: 14px; }

  .sol-card > p { min-height: 0; }

  .timeline::before { left: 25px; }
  .step { gap: 16px; padding-bottom: 18px; }
  .step__num {
    width: 52px; height: 52px;
    font-size: 15px;
    box-shadow: 0 0 0 6px var(--soft), var(--sh-sm);
  }
  .step:hover .step__num { box-shadow: 0 0 0 6px var(--soft), var(--sh-glow); }
  .step:hover .step__body { transform: none; }
  .step__body { padding: 20px 20px; }

  .form-card { padding: 28px 22px 26px; }

  .footer__nav { grid-template-columns: 1fr 1fr; gap: 26px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }

  .floating-card { padding: 9px 13px; }
  .floating-card strong { font-size: 11px; }
  .floating-card em { font-size: 14px; }
  .floating-card--a { left: -4px; top: 14%; }
  .floating-card--b { right: -4px; bottom: 6%; }

  .to-top { right: 16px; bottom: 18px; }
}

@media (max-width: 400px) {
  .hero__title { font-size: 30px; }
  .hero__cta .btn { width: 100%; }
  .footer__nav { grid-template-columns: 1fr; }
  .qr-card { flex-direction: column; align-items: flex-start; }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .js .reveal { opacity: 1; transform: none; }
}

/* 打印 */
@media print {
  .nav, .to-top, .scroll-progress, .toast, .filters { display: none !important; }
  .section, .hero { padding: 24px 0; page-break-inside: avoid; }
  .section--dark, .hero, .stats { background: #fff !important; color: #000 !important; }
}