/* ============================================================
   畅之意科技官网 - 样式表
   科技蓝简约风格
   ============================================================ */

/* ---------- 变量与基础 ---------- */
:root {
  --primary: #1e63ff;
  --primary-dark: #1648c0;
  --primary-light: #eaf1ff;
  --navy: #0b1e3d;
  --navy-2: #10294f;
  --text: #1f2d3d;
  --text-light: #5a6b7f;
  --bg: #ffffff;
  --bg-gray: #f5f8fc;
  --border: #e4ecf7;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(30, 99, 255, 0.08);
  --transition: all 0.3s ease;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(30, 99, 255, 0.35);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(11, 30, 61, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.logo-mark {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), #4a8cff);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  border-radius: 10px;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
}

.logo-text em {
  font-style: normal;
  color: var(--primary);
}

.main-nav .nav-list {
  display: flex;
  gap: 32px;
}

.nav-list a {
  font-size: 15px;
  color: var(--text-light);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: var(--transition);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--primary);
}

.nav-list a:hover::after,
.nav-list a.active::after {
  width: 100%;
}

.btn-nav {
  padding: 9px 20px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  padding: 170px 0 110px;
  background: linear-gradient(135deg, var(--navy) 0%, #16448f 60%, var(--primary) 100%);
  overflow: hidden;
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.12) 0, transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(120, 180, 255, 0.25) 0, transparent 45%);
}

.hero-bg::after {
  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;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.hero-content {
  max-width: 720px;
}

.hero-tag {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 30px;
  font-size: 14px;
  letter-spacing: 1px;
  color: #cfe0ff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 52px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 1px;
}

.hero-sub {
  margin: 22px 0 34px;
  font-size: 17px;
  color: #d5e2f7;
  max-width: 600px;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 720px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  backdrop-filter: blur(4px);
}

.stat-num {
  font-size: 40px;
  font-weight: 700;
  color: #fff;
}

.stat-unit {
  font-size: 20px;
  color: #8fc0ff;
  margin-left: 2px;
}

.stat-label {
  margin-top: 6px;
  font-size: 14px;
  color: #cfe0ff;
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 96px 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--navy);
}

.section-desc {
  margin-top: 14px;
  font-size: 16px;
  color: var(--text-light);
}

.section-head.light .section-title {
  color: #fff;
}

.section-head.light .section-desc {
  color: #cfe0ff;
}

.section-head.light .section-eyebrow {
  color: #8fc0ff;
}

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

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

.about-text b {
  color: var(--primary);
}

.about-points {
  margin-top: 22px;
}

.about-points li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--text);
  font-size: 15px;
}

.about-points li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: #fff;
  background: var(--primary);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- 核心业务 ---------- */
.services {
  background: var(--bg-gray);
}

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

.service-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.service-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  background: var(--primary-light);
  border-radius: 14px;
  margin-bottom: 20px;
}

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

.service-card p {
  font-size: 14.5px;
  color: var(--text-light);
}

/* ---------- 产品案例 ---------- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.product-img {
  overflow: hidden;
}

.product-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-img img {
  transform: scale(1.06);
}

.product-body {
  padding: 24px;
}

.product-body h3 {
  font-size: 18px;
  color: var(--navy);
  margin-bottom: 8px;
}

.product-body p {
  font-size: 14.5px;
  color: var(--text-light);
}

/* ---------- 服务流程 ---------- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.step {
  text-align: center;
  padding: 32px 18px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  transition: var(--transition);
}

.step:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.step-num {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: 50%;
}

.step h3 {
  font-size: 17px;
  color: var(--navy);
  margin-bottom: 8px;
}

.step p {
  font-size: 13.5px;
  color: var(--text-light);
}

/* ---------- 为什么选择我们 ---------- */
.advantage {
  background: linear-gradient(135deg, var(--navy) 0%, #123a73 60%, var(--primary) 100%);
  color: #fff;
}

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

.advantage-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  padding: 32px 24px;
  backdrop-filter: blur(4px);
}

.advantage-item h3 {
  font-size: 19px;
  margin-bottom: 10px;
  color: #fff;
}

.advantage-item p {
  font-size: 14.5px;
  color: #d5e2f7;
}

/* ---------- 联系我们 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}

.contact-info h3,
.contact-form-wrap h3 {
  font-size: 22px;
  color: var(--navy);
  margin-bottom: 24px;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}

.contact-icon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  background: var(--primary-light);
  border-radius: 12px;
}

.contact-list strong {
  display: block;
  font-size: 15px;
  color: var(--navy);
}

.contact-list p {
  font-size: 15px;
  color: var(--text-light);
  margin-top: 2px;
}

.contact-form-wrap {
  background: var(--bg-gray);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14.5px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 99, 255, 0.12);
}

.form-tip {
  margin-top: 12px;
  font-size: 14px;
  text-align: center;
  color: #22a06b;
}

.form-tip.error {
  color: #e5484d;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--navy);
  color: #cfe0ff;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-top: 60px;
  padding-bottom: 40px;
}

.logo-footer .logo-text {
  color: #fff;
}

.logo-footer .logo-text em {
  color: #8fc0ff;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 14px;
  max-width: 320px;
}

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

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

.footer-links a:hover {
  color: #8fc0ff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
  text-align: center;
  font-size: 13px;
  color: #8fa3bd;
}

.footer-bottom .icp {
  margin-top: 4px;
}

.footer-bottom .icp a {
  color: #8fa3bd;
  transition: var(--transition);
}

.footer-bottom .icp a:hover {
  color: #8fc0ff;
}

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

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .hero-title {
    font-size: 42px;
  }
}

@media (max-width: 768px) {
  .btn-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 10px 30px rgba(11, 30, 61, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .main-nav.open {
    max-height: 380px;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 12px 24px 20px;
  }

  .nav-list a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }

  .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);
  }

  .hero {
    padding: 130px 0 80px;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .services-grid,
  .products-grid,
  .process-steps,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

/* ---------- 滚动出现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}