/* ============================================================
   苏州大宇宙信息创造有限公司 - ICP 备案用企业官网
   纯静态样式表（无外部依赖、无外部字体/图标引用）
   ============================================================ */

:root {
  --c-primary: #1f5fe8;
  --c-primary-dark: #1446ad;
  --c-navy: #0b1f3f;
  --c-navy-2: #12366b;
  --c-teal: #2bb5a6;
  --c-text: #26313f;
  --c-text-light: #5b6b80;
  --c-bg: #ffffff;
  --c-bg-alt: #f4f7fb;
  --c-line: #e3e9f2;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(11, 31, 63, 0.08);
  --shadow-hover: 0 12px 32px rgba(11, 31, 63, 0.14);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--c-primary);
  text-decoration: none;
}

a:hover {
  color: var(--c-primary-dark);
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 头部 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--c-navy);
  font-weight: 700;
}

.logo:hover {
  color: var(--c-primary);
}

.logo-text {
  font-size: 17px;
  letter-spacing: 0.5px;
}

.site-nav {
  display: flex;
  gap: 8px;
}

.site-nav a {
  color: var(--c-text);
  font-size: 15px;
  padding: 8px 14px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

.site-nav a:hover {
  color: var(--c-primary);
  background: rgba(31, 95, 232, 0.06);
}

.site-nav a.active {
  color: var(--c-primary);
  background: rgba(31, 95, 232, 0.10);
  font-weight: 600;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-label span {
  width: 22px;
  height: 2px;
  background: var(--c-navy);
  border-radius: 2px;
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-2) 55%, #1b4da8 100%);
  color: #fff;
  padding: 96px 0 88px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--c-teal);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.hero-sub {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s, background 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--c-primary-dark);
  color: #fff;
  box-shadow: 0 8px 20px rgba(31, 95, 232, 0.35);
}

.btn-ghost {
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  color: #fff;
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.btn-light {
  background: #fff;
  color: var(--c-primary-dark);
}

.btn-light:hover {
  background: #eef3ff;
  color: var(--c-primary-dark);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
}

/* ---------- 通用区块 ---------- */

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--c-bg-alt);
}

.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-eyebrow {
  color: var(--c-primary);
  font-size: 14px;
  letter-spacing: 3px;
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: 30px;
  color: var(--c-navy);
  letter-spacing: 1px;
}

/* ---------- 简介两栏 ---------- */

.intro-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: start;
}

.intro-text p {
  color: var(--c-text-light);
  font-size: 16px;
  margin-bottom: 16px;
}

.intro-points {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 12px 24px;
  box-shadow: var(--shadow);
}

.intro-points li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--c-line);
}

.intro-points li:last-child {
  border-bottom: none;
}

.intro-points strong {
  color: var(--c-navy);
  font-size: 16px;
}

.intro-points span {
  color: var(--c-text-light);
  font-size: 14px;
}

/* ---------- 卡片 ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(31, 95, 232, 0.10);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--c-primary);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card h3 {
  font-size: 19px;
  color: var(--c-navy);
  margin-bottom: 10px;
}

.card p {
  font-size: 14.5px;
  color: var(--c-text-light);
  margin-bottom: 14px;
}

.card-link {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 优势 ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.feature strong {
  display: block;
  color: var(--c-navy);
  font-size: 17px;
  margin-bottom: 10px;
}

.feature p {
  color: var(--c-text-light);
  font-size: 14px;
}

/* ---------- CTA ---------- */

.cta-band {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: #fff;
  padding: 72px 0;
}

.cta-inner {
  text-align: center;
}

.cta-inner h2 {
  font-size: 28px;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.cta-inner p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 28px;
}

/* ---------- 页面横幅 ---------- */

.page-hero {
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-2) 60%, #1b4da8 100%);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 34px;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
}

/* ---------- 行业 chips ---------- */

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.chip {
  background: #fff;
  border: 1px solid var(--c-line);
  color: var(--c-text);
  border-radius: 999px;
  padding: 10px 24px;
  font-size: 15px;
  box-shadow: var(--shadow);
}

/* ---------- 联系页 ---------- */

.text-link {
  color: var(--c-primary);
  font-weight: 600;
}

.contact-actions {
  margin-top: 40px;
  text-align: center;
}

/* ---------- 页脚 ---------- */

.site-footer {
  background: var(--c-navy);
  color: rgba(255, 255, 255, 0.75);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 40px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 14px;
}

.footer-brand .logo:hover {
  color: var(--c-teal);
}

.footer-brand p {
  font-size: 14px;
  max-width: 320px;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-col ul li {
  font-size: 14px;
  margin-bottom: 10px;
}

.footer-col ul a {
  color: rgba(255, 255, 255, 0.75);
}

.footer-col ul a:hover {
  color: var(--c-teal);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-size: 13.5px;
}

/* 备案成功：页脚备案号已正式悬挂展示 */

.footer-bottom .beian a {
  color: rgba(255, 255, 255, 0.75);
}

.footer-bottom .beian a:hover {
  color: var(--c-teal);
}

.footer-bottom .sep {
  margin: 0 10px;
  color: rgba(255, 255, 255, 0.35);
}

/* ---------- 404 ---------- */

.error-page {
  background: var(--c-bg-alt);
}

.error-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.error-inner {
  text-align: center;
}

.error-code {
  font-size: 96px;
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1;
  margin-bottom: 12px;
}

.error-inner h1 {
  font-size: 26px;
  color: var(--c-navy);
  margin-bottom: 12px;
}

.error-inner p {
  color: var(--c-text-light);
  margin-bottom: 28px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .hero-inner,
  .intro-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    display: none;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 680px) {
  .nav-toggle-label {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--c-line);
    padding: 12px 24px 20px;
    box-shadow: var(--shadow);
    display: none;
  }

  .nav-toggle:checked ~ .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 12px 8px;
  }

  .hero {
    padding: 64px 0;
  }

  .hero h1 {
    font-size: 32px;
  }

  .section {
    padding: 56px 0;
  }

  .section-head h2 {
    font-size: 24px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}