/* ============================================
   点云科技官网 - Design Tokens
   ============================================ */
:root {
  /* Backgrounds */
  --bg-base: #FAFAFA;
  --bg-card: #FFFFFF;
  --bg-section: #F2F2F5;
  --bg-dark: #0A0A0A;
  --bg-dark-card: #17171C;
  --bg-darker: #0D0D0D;

  /* Text */
  --text-primary: #17171C;
  --text-secondary: #6F6F7A;
  --text-tertiary: #A1A1AB;
  --text-inverse: #FFFFFF;
  --text-inverse-secondary: rgba(255, 255, 255, 0.6);

  /* Accent */
  --accent: #5E6AD2;
  --accent-light: #828CE8;
  --accent-cyan: #4ECDC4;
  --accent-purple: #9D5EFF;

  /* Borders */
  --border-light: #E3E3E8;
  --border-input: #E0E0E6;
  --border-dark: rgba(255, 255, 255, 0.1);

  /* Gradients */
  --gradient-indigo: linear-gradient(135deg, #1A1A2E 0%, #5E6AD2 100%);
  --gradient-cyan: linear-gradient(135deg, #0D1A2E 0%, #4ECDC4 100%);
  --gradient-purple: linear-gradient(135deg, #260D33 0%, #9D5EFF 100%);
  --gradient-hero: radial-gradient(ellipse at 50% 40%, rgba(94, 106, 210, 0.15) 0%, rgba(10, 10, 10, 0) 60%);

  /* Spacing */
  --container-width: 1200px;
  --container-padding: 120px;
  --section-gap: 64px;
  --card-gap: 24px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 20px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Reset & Base
   ============================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; cursor: pointer; font-family: inherit; }
input, textarea { font-family: inherit; outline: none; }

/* ============================================
   Navigation Bar
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 48px;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}

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

.nav-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--text-primary);
  font-weight: 500;
}

.nav-cta {
  padding: 8px 20px;
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}

.nav-cta:hover { background: var(--accent); }

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  height: 720px;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  max-width: var(--container-width);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--text-inverse);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 3px;
  background: var(--accent-light);
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 68px;
  color: var(--text-inverse);
}

.hero-subtitle {
  font-size: 17px;
  line-height: 30px;
  color: var(--text-inverse-secondary);
  max-width: 580px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  padding: 0 28px;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  padding: 0 28px;
  background: transparent;
  color: var(--text-inverse);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 400;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-inverse);
  line-height: 1;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-inverse-secondary);
  margin-top: 6px;
}

/* ============================================
   Section Common
   ============================================ */
.section { padding: 100px var(--container-padding); }
.section-light { background: var(--bg-base); }
.section-gray { background: var(--bg-section); }

.section-inner {
  max-width: var(--container-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 40px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   About Section
   ============================================ */
.about-wrap { display: flex; gap: 64px; align-items: center; }
.about-text { flex: 1; }
.about-text p { font-size: 15px; line-height: 28px; color: var(--text-secondary); margin-bottom: 20px; }

.about-visual {
  flex: 0 0 420px;
  height: 420px;
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about-visual::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--gradient-hero);
}

.about-visual-big {
  position: relative;
  font-size: 96px;
  font-weight: 900;
  color: var(--text-inverse);
  line-height: 1;
}

.about-visual-sub {
  position: relative;
  font-size: 14px;
  color: var(--text-inverse-secondary);
  margin-top: 16px;
}

/* ============================================
   Products Section
   ============================================ */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

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

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.product-card-visual {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-visual.gradient-indigo { background: var(--gradient-indigo); }
.product-card-visual.gradient-cyan { background: var(--gradient-cyan); }
.product-card-visual.gradient-purple { background: var(--gradient-purple); }

.product-card-visual-text {
  font-size: 48px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.1);
}

.product-card-body { padding: 28px; }
.product-card-name { font-size: 20px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.product-card-desc { font-size: 14px; line-height: 24px; color: var(--text-secondary); margin-bottom: 16px; }
.product-card-features { font-size: 13px; line-height: 22px; color: var(--text-secondary); margin-bottom: 16px; white-space: pre-line; }
.product-card-link { font-size: 14px; font-weight: 600; color: var(--accent); transition: var(--transition); }
.product-card-link:hover { color: var(--accent-light); }

/* ============================================
   Solutions Section
   ============================================ */
.solution-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.solution-card {
  display: flex;
  gap: 24px;
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.solution-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(94, 106, 210, 0.1);
}

.solution-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border: 1px solid var(--text-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
}

.solution-body { flex: 1; }
.solution-title { font-size: 18px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; line-height: 26px; }
.solution-desc { font-size: 14px; line-height: 24px; color: var(--text-secondary); margin-bottom: 10px; }
.solution-tags { font-size: 12px; line-height: 20px; color: var(--text-tertiary); }

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

.advantage-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.advantage-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.advantage-icon { font-size: 20px; font-weight: 800; color: var(--accent); margin-bottom: 16px; }
.advantage-title { font-size: 17px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.advantage-desc { font-size: 13px; line-height: 22px; color: var(--text-secondary); }

/* ============================================
   Industries Section
   ============================================ */
.industry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.industry-card {
  height: 240px;
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.industry-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2); }
.industry-card.bg-indigo { background: var(--gradient-indigo); }
.industry-card.bg-cyan { background: var(--gradient-cyan); }
.industry-card.bg-purple { background: var(--gradient-purple); }
.industry-card.bg-dark { background: var(--bg-dark-card); }

.industry-num { font-size: 14px; font-weight: 700; color: rgba(255, 255, 255, 0.5); margin-bottom: 8px; }
.industry-name { font-size: 18px; font-weight: 700; color: var(--text-inverse); margin-bottom: 6px; }
.industry-desc { font-size: 13px; line-height: 22px; color: rgba(255, 255, 255, 0.7); }

/* ============================================
   Roadmap Section
   ============================================ */
.roadmap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.roadmap-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.roadmap-card.highlight { border: 2px solid var(--accent); }

.roadmap-phase {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-section);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.roadmap-title { font-size: 20px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.roadmap-period { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }

.roadmap-goal {
  padding: 12px 16px;
  background: var(--bg-section);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.roadmap-list { font-size: 13px; line-height: 24px; color: var(--text-secondary); white-space: pre-line; }

/* ============================================
   Contact Section
   ============================================ */
.contact-wrap { display: flex; gap: 48px; }

.contact-form {
  flex: 1;
  padding: 40px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
}

.form-row { display: flex; gap: 20px; margin-bottom: 20px; }
.form-group { flex: 1; }
.form-label { display: block; font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }

.form-input {
  width: 100%;
  height: 44px;
  padding: 0 16px;
  background: var(--bg-base);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  transition: var(--transition);
}

.form-input:focus { border-color: var(--accent); background: var(--bg-card); }

.form-textarea {
  width: 100%;
  height: 120px;
  padding: 12px 16px;
  background: var(--bg-base);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  resize: none;
  transition: var(--transition);
}

.form-textarea:focus { border-color: var(--accent); background: var(--bg-card); }

.form-submit {
  width: 100%;
  height: 48px;
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  margin-top: 8px;
  transition: var(--transition);
}

.form-submit:hover { background: var(--accent); }

.info-column { flex: 0 0 380px; display: flex; flex-direction: column; gap: 16px; }

.info-card { padding: 24px; background: var(--bg-card); border-radius: var(--radius-md); transition: var(--transition); }
.info-card:hover { box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06); }
.info-label { font-size: 14px; font-weight: 500; color: var(--text-tertiary); margin-bottom: 6px; }
.info-value { font-size: 16px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.info-sub { font-size: 13px; color: var(--text-secondary); }

/* ============================================
   Footer
   ============================================ */
.footer { background: var(--bg-dark); padding: 64px var(--container-padding) 48px; }
.footer-inner { max-width: var(--container-width); margin: 0 auto; }
.footer-top { display: flex; gap: 48px; padding-bottom: 48px; }
.footer-brand { flex: 1; }

.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo-mark { display: flex; align-items: center; justify-content: center; }
.footer-logo-text { font-size: 20px; font-weight: 700; color: var(--text-inverse); }
.footer-desc { font-size: 14px; line-height: 24px; color: var(--text-inverse-secondary); max-width: 360px; }

.footer-col { flex: 0 0 160px; }
.footer-col-title { font-size: 14px; font-weight: 600; color: var(--text-inverse); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 13px; color: var(--text-inverse-secondary); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--text-inverse); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-dark);
}

.footer-copyright { font-size: 13px; color: var(--text-inverse-secondary); }
.footer-icp { font-size: 12px; color: var(--text-inverse-secondary); }

/* ============================================
   Mobile Nav Toggle & Drawer
   ============================================ */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 210;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

.nav-toggle:hover span { background: var(--accent); }

/* Mobile Menu Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 200;
  visibility: hidden;
  pointer-events: none;
}

.mobile-menu.active {
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-menu.active .mobile-menu-overlay { opacity: 1; }

.mobile-menu-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  max-width: 85%;
  height: 100%;
  background: var(--bg-base);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
}

.mobile-menu.active .mobile-menu-panel { transform: translateX(0); }

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 64px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.mobile-menu-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.mobile-menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-menu-close:hover { color: var(--text-primary); background: var(--bg-section); }

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  padding: 8px 0;
  overflow-y: auto;
  flex: 1;
}

.mobile-menu-nav a {
  padding: 16px 24px;
  font-size: 16px;
  color: var(--text-secondary);
  transition: var(--transition);
  border-bottom: 1px solid var(--border-light);
}

.mobile-menu-nav a:hover,
.mobile-menu-nav a.active {
  color: var(--accent);
  background: var(--bg-section);
  font-weight: 600;
}

.mobile-menu-cta {
  margin: 24px 24px 0;
  padding: 14px 24px !important;
  background: var(--text-primary) !important;
  color: var(--text-inverse) !important;
  text-align: center;
  border-radius: var(--radius-sm);
  font-weight: 600;
  border-bottom: none !important;
  font-size: 15px !important;
}

.mobile-menu-cta:hover {
  background: var(--accent) !important;
  color: var(--text-inverse) !important;
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-section); }
::-webkit-scrollbar-thumb { background: var(--text-tertiary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1200px) {
  :root { --container-padding: 60px; }
  .nav-menu { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .navbar { padding: 0 32px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .roadmap-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .about-wrap { flex-direction: column; }
  .about-visual { flex: 0 0 320px; height: 320px; width: 100%; }
  .contact-wrap { flex-direction: column; }
  .info-column { flex: none; flex-direction: row; flex-wrap: wrap; }
  .info-card { flex: 1; min-width: 200px; }
}

@media (max-width: 768px) {
  :root { --container-padding: 24px; }
  .navbar { padding: 0 20px; }
  .hero { height: auto; padding: 80px 24px; }
  .hero-title { font-size: 32px; line-height: 44px; }
  .hero-subtitle { font-size: 15px; line-height: 26px; }
  .section { padding: 64px var(--container-padding); }
  .section-title { font-size: 26px; }
  .section-header { margin-bottom: 40px; }
  .hero-stats { flex-wrap: wrap; gap: 24px; justify-content: center; }
  .hero-stat-num { font-size: 28px; }
  .product-grid { grid-template-columns: 1fr; }
  .advantage-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  .footer-top { flex-direction: column; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .footer { padding: 48px var(--container-padding) 32px; }
}