/* ============================================
   创梦互联 GEO 官网 — 样式表
   ============================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);
  --max-width: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .2s;
}
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

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

/* ---------- Header / Nav ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -.5px;
}
.logo:hover { color: var(--primary-dark); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all .2s;
}
.nav-links a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-cta {
  background: var(--primary) !important;
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 8px !important;
}
.nav-cta:hover {
  background: var(--primary-dark) !important;
}

/* ---------- Hamburger Menu ---------- */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  gap: 5px;
  z-index: 101;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: all .25s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ---------- Mobile Menu ---------- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(255,255,255,.98);
  backdrop-filter: blur(10px);
  z-index: 99;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
}

.mobile-nav-link {
  display: block;
  padding: 14px 40px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  border-radius: 8px;
  transition: all .2s;
}
.mobile-nav-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-nav-cta {
  display: inline-block;
  margin-top: 8px;
  padding: 14px 48px;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border-radius: 8px;
  transition: all .2s;
}
.mobile-nav-cta:hover {
  background: var(--primary-dark);
  color: #fff;
}

/* ---------- Hero ---------- */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #e0f2fe 100%);
  text-align: center;
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hero-desc {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  margin: 16px 0 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin: 32px 0;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.stat-num small {
  font-size: 1rem;
  font-weight: 600;
}

.stat-label {
  font-size: .85rem;
  color: var(--text-secondary);
  margin-top: 4px;
  display: block;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 14px 40px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .2s;
  text-align: center;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-block { display: block; width: 100%; }

/* ---------- Sections ---------- */
.section {
  padding: 80px 0;
}

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

.section h2 {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -.5px;
}

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 48px;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s;
}
.about-card:hover { box-shadow: var(--shadow-lg); }

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--primary);
}

.about-card p {
  font-size: .95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- GEO Intro ---------- */
.geo-intro {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.geo-intro p {
  font-size: 1.05rem;
  margin-bottom: 16px;
}

.geo-steps {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 32px;
  margin: 24px 0;
  flex-wrap: wrap;
}

.geo-steps li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 600;
}

.step-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: .9rem;
  font-weight: 700;
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}
.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.service-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- Platforms ---------- */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.platform-card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
  color: var(--text);
}
.platform-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  color: var(--text);
}

.platform-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.platform-meta {
  font-size: .8rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.platform-card p {
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.platform-link {
  font-size: .9rem;
  font-weight: 600;
  color: var(--primary);
}

/* ---------- Advantages ---------- */
.advantages-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.advantage-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s;
}
.advantage-item:hover { box-shadow: var(--shadow-lg); }

.advantage-num {
  flex-shrink: 0;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
  width: 48px;
}

.advantage-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.advantage-body p {
  font-size: .92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item:hover { box-shadow: var(--shadow); }

.faq-item summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--primary);
  font-weight: 700;
  transition: transform .2s;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 24px 18px;
  font-size: .92rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border-radius: 8px;
}

.contact-label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.contact-item span:last-child {
  font-size: .95rem;
}

.contact-form {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.contact-form h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.contact-form label {
  display: block;
  margin-bottom: 16px;
}

.contact-form label span {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  font-family: inherit;
  transition: border-color .2s;
  background: var(--bg);
  color: var(--text);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* ---------- Footer ---------- */
.footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 48px 0 24px;
}

.footer a { color: #93c5fd; }
.footer a:hover { color: #fff; }

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid #334155;
  margin-bottom: 24px;
}

.footer-brand strong {
  display: block;
  font-size: 1.2rem;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: .88rem;
  line-height: 1.6;
}

.footer-links h4,
.footer-contact h4 {
  color: #fff;
  font-size: .95rem;
  margin-bottom: 12px;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: .88rem;
}

.footer-contact p {
  font-size: .88rem;
  margin-bottom: 6px;
}

.footer-bottom {
  text-align: center;
  font-size: .85rem;
}

.footer-slogan {
  margin-top: 8px;
  color: var(--accent);
  font-weight: 600;
}

/* ---------- Responsive ---------- */

/* 小手机 (<480px) */
@media (max-width: 480px) {
  .container { padding: 0 16px; }

  .hero { padding: 48px 0 36px; }
  .hero h1 { font-size: 1.5rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-desc { font-size: 1.05rem; }
  .hero-stats { gap: 16px; }
  .stat-num { font-size: 1.5rem; }
  .stat-label { font-size: .78rem; }

  .section { padding: 36px 0; }
  .section h2 { font-size: 1.3rem; }
  .section-desc { font-size: .92rem; margin-bottom: 28px; }

  .about-card,
  .service-card { padding: 20px; }
  .service-card h3,
  .about-card h3 { font-size: 1rem; }
  .service-card p,
  .about-card p { font-size: .85rem; }

  .geo-intro p { font-size: .92rem; }
  .geo-steps { flex-direction: column; align-items: flex-start; gap: 12px; }
  .geo-steps li { font-size: 1rem; }

  .platform-card { padding: 20px; }

  .advantage-item { padding: 20px; }
  .advantage-body p { font-size: .85rem; }

  .faq-item summary { padding: 14px 16px; font-size: .92rem; }
  .faq-item p { padding: 0 16px 14px; font-size: .85rem; }

  .contact-item { padding: 12px 16px; }
  .contact-item span:last-child { font-size: .85rem; }
  .contact-form { padding: 20px; }
  .contact-form label span { font-size: .8rem; }

  .footer { padding: 32px 0 20px; }
  .footer-content { gap: 20px; }
  .footer-brand strong { font-size: 1.05rem; }
  .footer-brand p,
  .footer-links a,
  .footer-contact p { font-size: .82rem; }
  .footer-bottom { font-size: .78rem; }

  .btn { padding: 12px 28px; font-size: .92rem; }
}

/* 手机 (481px-768px) */
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .mobile-menu { display: flex; }
  .nav-links { display: none; }

  .hero { padding: 56px 0 40px; }
  .hero h1 { font-size: 1.7rem; }
  .hero-desc { font-size: 1.1rem; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 1.7rem; }

  .section { padding: 44px 0; }
  .section h2 { font-size: 1.4rem; }
  .section-desc { font-size: .95rem; margin-bottom: 32px; }

  .about-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .platforms-grid { grid-template-columns: 1fr; }

  .advantage-item { flex-direction: column; gap: 12px; padding: 24px; }
  .advantage-num { font-size: 1.6rem; }
  .advantage-body h3 { font-size: 1rem; }

  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .contact-form { padding: 24px; }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .geo-steps { gap: 16px; flex-wrap: wrap; justify-content: center; }
  .geo-steps li { font-size: 1rem; }
}

/* 小平板 (769px-1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .container { padding: 0 28px; }

  .hero h1 { font-size: 2.2rem; }
  .hero-desc { font-size: 1.25rem; }
  .hero-stats { gap: 36px; }
  .stat-num { font-size: 2rem; }

  .section { padding: 64px 0; }
  .section h2 { font-size: 1.75rem; }

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

  .contact-grid { gap: 28px; }

  .footer-content {
    grid-template-columns: 2fr 1fr;
    gap: 28px;
  }
}

/* 大屏优化 (>1024px) */
@media (min-width: 1025px) {
  .menu-toggle { display: none !important; }
  .mobile-menu { display: none !important; }
}