/* ============================================================
   陕西阑姗网络信息服务有限公司 - 企业官网样式
   风格：现代科技蓝青（深蓝黑底 + 青色渐变高亮）
   ============================================================ */

:root {
  /* 深色系 */
  --ink: #0A1628;          /* 主深底 */
  --ink-2: #0E1E33;        /* 次深底 */
  --ink-3: #132740;        /* 卡片底 */

  /* 品牌色 */
  --cyan: #22D3EE;         /* 主青色 */
  --teal: #2DD4BF;         /* 辅青绿 */
  --blue: #38BDF8;         /* 科技蓝 */
  --grad: linear-gradient(120deg, #22D3EE, #38BDF8 55%, #2DD4BF);

  /* 浅色系 */
  --paper: #F6FAFC;        /* 浅色区背景 */
  --card: #FFFFFF;
  --line: #E2E8F0;

  /* 文字 */
  --text: #E2E8F0;
  --muted: #9FB3C8;
  --dark-text: #0F172A;
  --dark-muted: #475569;

  --radius: 14px;
  --shadow: 0 10px 30px rgba(10, 22, 40, .08);
  --shadow-lg: 0 24px 60px rgba(10, 22, 40, .18);
  --header-h: 68px;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC",
               system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--dark-text);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
strong { font-weight: 700; }

.container {
  width: min(1140px, 92%);
  margin-inline: auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--grad);
  color: #05202B;
  box-shadow: 0 8px 24px rgba(34, 211, 238, .35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(34, 211, 238, .5); }

.btn-ghost {
  border-color: rgba(148, 197, 214, .4);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-sm { padding: 9px 22px; font-size: 14px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(10, 22, 40, .55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(148, 197, 214, .12);
  transition: background .3s, box-shadow .3s;
}
.site-header.scrolled {
  background: rgba(10, 22, 40, .92);
  box-shadow: 0 6px 24px rgba(0, 0, 0, .25);
}

.nav-wrap {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--grad);
  color: #05202B;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .5px;
}

.brand-text {
  display: flex; flex-direction: column;
  color: #FFF;
  font-weight: 700;
  font-size: 16px;
  line-height: 1.2;
}
.brand-text em {
  font-style: normal;
  font-weight: 400;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 1px;
}

.site-nav { display: flex; align-items: center; gap: 6px; }

.nav-link {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--muted);
  transition: color .2s, background .2s;
}
.nav-link:hover { color: #FFF; }
.nav-link.active { color: var(--cyan); background: rgba(34, 211, 238, .1); }

.nav-cta {
  margin-left: 10px;
  background: var(--grad);
  color: #05202B;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 60px) 0 70px;
  background: radial-gradient(1200px 600px at 70% -10%, #12325A 0%, var(--ink) 55%);
  color: var(--text);
  overflow: hidden;
}

/* 背景装饰 */
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .5;
}
.glow-a {
  width: 460px; height: 460px;
  top: -140px; right: -80px;
  background: radial-gradient(circle, rgba(34, 211, 238, .55), transparent 70%);
}
.glow-b {
  width: 380px; height: 380px;
  bottom: -120px; left: -100px;
  background: radial-gradient(circle, rgba(56, 189, 248, .4), transparent 70%);
}
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148, 197, 214, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 197, 214, .06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 75%);
}

.hero-inner { position: relative; }

.hero-badge {
  display: inline-block;
  padding: 7px 18px;
  border: 1px solid rgba(34, 211, 238, .4);
  border-radius: 999px;
  background: rgba(34, 211, 238, .08);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 26px;
}

.hero-title {
  font-size: clamp(34px, 5.4vw, 58px);
  line-height: 1.25;
  font-weight: 800;
  color: #FFF;
  letter-spacing: 1px;
  margin-bottom: 22px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 720px;
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--muted);
  margin-bottom: 34px;
}
.hero-sub strong { color: var(--cyan); font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 60px; }

/* 数据条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding-top: 34px;
  border-top: 1px solid rgba(148, 197, 214, .18);
  max-width: 820px;
}
.stat-num {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}
.stat-num small { font-size: .5em; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--muted); letter-spacing: 1px; }

/* ---------- 区块通用 ---------- */
.section { padding: 92px 0; }
.section-alt { background: #EFF6FA; }

.section-dark {
  background:
    radial-gradient(900px 420px at 85% 0%, rgba(18, 50, 90, .85), transparent 65%),
    var(--ink);
  color: var(--text);
}

.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--teal);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.section-dark .section-head h2 { color: #FFF; }

.section-head p { color: var(--dark-muted); font-size: 16px; }
.section-dark .section-head p { color: var(--muted); }

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.about-intro h3, .about-info h3 {
  font-size: 21px;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}
.about-intro h3::before, .about-info h3::before {
  content: "";
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 4px;
  border-radius: 4px;
  background: var(--grad);
}
.about-intro p { color: var(--dark-muted); margin-bottom: 14px; font-size: 15.5px; }
.about-intro strong { color: var(--dark-text); }

.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }

.pill {
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: #0E7490;
  background: rgba(34, 211, 238, .12);
  border: 1px solid rgba(34, 211, 238, .35);
}

/* 业务聚焦卡片 */
.about-info {
  position: relative;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  overflow: hidden;
}
.about-info::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
}
.focus-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 11px 14px;
}
.focus-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--dark-text);
}
.focus-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--grad);
}
.focus-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}
.focus-foot p { font-size: 13.5px; color: var(--dark-muted); }
.focus-link {
  font-size: 14px;
  font-weight: 600;
  color: #0E7490;
  white-space: nowrap;
  transition: color .2s;
}
.focus-link:hover { color: var(--teal); }

/* 愿景卡片 */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.vision-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow);
  transition: transform .3s, box-shadow .3s;
}
.vision-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.vision-icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(34, 211, 238, .16), rgba(56, 189, 248, .16));
  color: #0891B2;
  margin-bottom: 18px;
}
.vision-icon svg { width: 26px; height: 26px; }

.vision-card h4 { font-size: 18px; margin-bottom: 10px; }
.vision-card p { font-size: 14.5px; color: var(--dark-muted); }

/* ---------- 核心业务 ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-bottom: 46px;
}

.service-card {
  position: relative;
  background: var(--card);
  border-radius: var(--radius);
  padding: 34px 28px 30px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--ink), #14406B);
  color: var(--cyan);
  margin-bottom: 20px;
}
.card-icon svg { width: 28px; height: 28px; }

.service-card h3 { font-size: 17.5px; margin-bottom: 12px; line-height: 1.45; }
.service-card > p { font-size: 14.5px; color: var(--dark-muted); margin-bottom: 16px; }

.card-list { border-top: 1px dashed var(--line); padding-top: 14px; }
.card-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--dark-text);
  margin-bottom: 7px;
}
.card-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--grad);
}

/* 服务优势条 */
.advantage-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  background: linear-gradient(120deg, #0C2440, #103A5E);
  border-radius: var(--radius);
  padding: 30px 34px;
  box-shadow: var(--shadow-lg);
}
.advantage-item {
  text-align: center;
  padding: 4px 10px;
  border-right: 1px solid rgba(148, 197, 214, .2);
}
.advantage-item:last-child { border-right: 0; }
.advantage-item strong {
  display: block;
  font-size: 19px;
  color: var(--cyan);
  margin-bottom: 6px;
}
.advantage-item span { font-size: 13.5px; color: var(--muted); }

/* ---------- 运营模式 ---------- */
.flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 18px;
  align-items: stretch;
}

.flow-step {
  background: rgba(19, 39, 64, .75);
  border: 1px solid rgba(148, 197, 214, .16);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: border-color .3s, transform .3s;
}
.flow-step:hover { border-color: rgba(34, 211, 238, .5); transform: translateY(-5px); }

.flow-no {
  font-size: 34px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 12px;
  line-height: 1;
}
.flow-step h3 { font-size: 19px; color: #FFF; margin-bottom: 12px; }
.flow-step p { font-size: 14.5px; color: var(--muted); }

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--cyan);
  font-size: 26px;
  opacity: .8;
}

/* ---------- 技术成果 ---------- */
.achieve-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 46px;
}
.achieve-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  border-bottom: 3px solid transparent;
  transition: transform .3s, box-shadow .3s;
}
.achieve-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.achieve-num {
  font-size: 44px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}
.achieve-num small { font-size: .45em; }
.achieve-card h4 { font-size: 17px; margin: 8px 0 10px; }
.achieve-card p { font-size: 14px; color: var(--dark-muted); }

.capability {
  background: var(--card);
  border-radius: var(--radius);
  padding: 34px;
  box-shadow: var(--shadow);
}
.capability h3 { font-size: 20px; margin-bottom: 22px; text-align: center; }
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.cap-group h5 {
  font-size: 15px;
  color: #0E7490;
  margin-bottom: 12px;
  padding-left: 10px;
  border-left: 3px solid var(--teal);
}

/* ---------- 联系我们 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-bottom: 46px;
}
.contact-card {
  background: rgba(19, 39, 64, .75);
  border: 1px solid rgba(148, 197, 214, .16);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: border-color .3s, transform .3s;
}
.contact-card:hover { border-color: rgba(34, 211, 238, .5); transform: translateY(-5px); }

.contact-icon {
  width: 50px; height: 50px;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: rgba(34, 211, 238, .12);
  color: var(--cyan);
}
.contact-icon svg { width: 24px; height: 24px; }

.contact-card h4 { font-size: 16px; color: #FFF; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--muted); }
.contact-card a { color: var(--cyan); }

.cta-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  flex-wrap: wrap;
  background: linear-gradient(120deg, rgba(34, 211, 238, .14), rgba(56, 189, 248, .1));
  border: 1px solid rgba(34, 211, 238, .35);
  border-radius: var(--radius);
  padding: 34px 38px;
}
.cta-band h3 { font-size: 21px; color: #FFF; margin-bottom: 8px; }
.cta-band p { font-size: 14.5px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #060F1C;
  color: var(--muted);
  padding: 60px 0 0;
  border-top: 1px solid rgba(148, 197, 214, .1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 34px;
  padding-bottom: 40px;
}
.footer-col .brand { margin-bottom: 16px; }
.footer-col p { font-size: 13.5px; margin-bottom: 8px; }
.footer-col h5 {
  color: #FFF;
  font-size: 15px;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h5::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 30px; height: 2px;
  background: var(--grad);
}
.footer-col a {
  display: block;
  font-size: 13.5px;
  padding: 5px 0;
  color: var(--muted);
  transition: color .2s;
}
.footer-col p a { display: inline; color: var(--muted); }
.footer-col p a:hover { color: var(--cyan); }
.footer-col a:hover { color: var(--cyan); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid rgba(148, 197, 214, .12);
  font-size: 13px;
}
.footer-bottom a:hover { color: var(--cyan); }

/* ---------- 滚动显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .capability-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .vision-grid { grid-template-columns: 1fr; }
  .achieve-grid { grid-template-columns: 1fr; }

  /* 运营模式改为纵向 */
  .flow { grid-template-columns: 1fr; }
  .flow-arrow { transform: rotate(90deg); padding: 2px 0; }

  .advantage-bar { grid-template-columns: 1fr; gap: 0; }
  .advantage-item {
    border-right: 0;
    border-bottom: 1px solid rgba(148, 197, 214, .2);
    padding: 14px 0;
  }
  .advantage-item:last-child { border-bottom: 0; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- 移动端导航 ---------- */
@media (max-width: 820px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(10, 22, 40, .98);
    border-bottom: 1px solid rgba(148, 197, 214, .15);
    padding: 18px 5vw 26px;
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform .35s, opacity .35s;
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link { padding: 13px 14px; font-size: 16px; }
  .nav-cta { margin: 10px 0 0; text-align: center; }
}

@media (max-width: 640px) {
  .section { padding: 66px 0; }

  .hero { min-height: auto; padding-bottom: 56px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 22px 14px; }
  .hero-actions .btn { width: 100%; text-align: center; }

  .cards-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  .cta-band { padding: 26px 22px; }
  .cta-band .btn { width: 100%; text-align: center; }

  .footer-bottom { justify-content: center; text-align: center; }
  .focus-list { grid-template-columns: 1fr; }
}