/* ============================================
   优龙智行 APP 官网 — 样式表
   Maddox Robot Official Site
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #0A6E6E;
  --color-primary-dark: #075555;
  --color-primary-light: #E6F4F4;
  --color-secondary: #1B3A5C;
  --color-accent: #0099CC;
  --color-text: #1A1A2E;
  --color-text-secondary: #4A5568;
  --color-text-light: #718096;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7FAFC;
  --color-border: #E2E8F0;
  --color-success: #2F855A;
  --color-white: #FFFFFF;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", monospace;

  --max-width: 1200px;
  --nav-height: 72px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

ul, ol {
  list-style: none;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 800;
}

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

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform 0.2s ease;
  border-radius: 1px;
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--color-primary);
  color: white !important;
  border-radius: var(--radius-full);
  font-size: 14px !important;
  font-weight: 600 !important;
  transition: all 0.2s ease !important;
}

.nav-download-btn:hover {
  background: var(--color-primary-dark) !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(10, 110, 110, 0.3);
}

.nav-download-btn::after {
  display: none !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all 0.3s ease;
}

/* --- Hero Section --- */
.hero {
  padding: calc(var(--nav-height) + 80px) 24px 100px;
  background: linear-gradient(170deg, #F0F9F9 0%, #E8F4F8 40%, #FFFFFF 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(10, 110, 110, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 153, 204, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.3px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--color-secondary);
  margin-bottom: 20px;
}

.hero-title span {
  color: var(--color-primary);
}

.hero-desc {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--color-primary);
  color: white !important;
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 110, 110, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--color-primary) !important;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

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

.hero-phone-mockup {
  width: 280px;
  height: 560px;
  background: linear-gradient(180deg, #1A1A2E 0%, #16213E 100%);
  border-radius: 36px;
  padding: 18px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.1);
  position: relative;
}

.hero-phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #F7FAFC 0%, #EDF2F7 100%);
  border-radius: 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.hero-phone-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.hero-phone-icon svg {
  width: 36px;
  height: 36px;
  fill: white;
}

.hero-phone-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

.hero-phone-subtitle {
  font-size: 13px;
  color: var(--color-text-light);
}

/* --- Section Common --- */
.section {
  padding: 100px 24px;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--color-secondary);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Features Section --- */
.features-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.feature-icon.blue { background: #EBF5FB; color: #2980B9; }
.feature-icon.teal { background: #E6F4F4; color: #0A6E6E; }
.feature-icon.green { background: #E8F8F0; color: #27AE60; }
.feature-icon.purple { background: #F3EEFA; color: #8E44AD; }
.feature-icon.orange { background: #FEF5E7; color: #E67E22; }
.feature-icon.red { background: #FDEDEC; color: #C0392B; }

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Products Section --- */
.products-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.product-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
  transform: translateY(-2px);
}

.product-image {
  height: 200px;
  background: linear-gradient(135deg, #E8F4F8 0%, #F0F9F9 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--color-bg));
}

.product-image-icon {
  font-size: 64px;
  opacity: 0.3;
}

.product-info {
  padding: 24px;
}

.product-info h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

.product-info .product-tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.product-info p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- App Screenshots Section --- */
.screenshots-scroll {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.screenshot-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
  aspect-ratio: 9/16;
  position: relative;
}

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

.screenshot-mock {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #F7FAFC 0%, #EDF2F7 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 20px;
}

.screenshot-mock-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
}

.screenshot-mock-bar {
  width: 80%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}

.screenshot-mock-bar::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 65%;
  background: var(--color-primary);
  border-radius: 2px;
}

.screenshot-mock-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 3px solid var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--color-primary);
}

.screenshot-label {
  text-align: center;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

/* --- About Section --- */
.about-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-content h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 800;
  color: var(--color-secondary);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.about-content p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-content .company-name {
  font-weight: 700;
  color: var(--color-primary);
}

.about-values {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.about-value-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.about-value-item .check-icon {
  width: 22px;
  height: 22px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.about-stat {
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: transform 0.3s ease;
}

.about-stat:hover {
  transform: scale(1.03);
}

.about-stat-number {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.about-stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Contact Section --- */
.contact-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-item-content h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.contact-item-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.contact-map {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.contact-map-placeholder {
  flex: 1;
  background: linear-gradient(135deg, #E8F4F8 0%, #F0F9F9 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}

.contact-map-label {
  text-align: center;
  padding: 16px;
  font-size: 14px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
}

.contact-map-label strong {
  color: var(--color-secondary);
}

/* --- Footer --- */
.footer {
  background: var(--color-secondary);
  color: rgba(255, 255, 255, 0.85);
  padding: 60px 24px 0;
}

.footer-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
  font-size: 20px;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  opacity: 0.7;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: white;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: white;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  opacity: 0.6;
}

/* --- Legal Pages --- */
.legal-page {
  padding: calc(var(--nav-height) + 60px) 24px 80px;
}

.legal-container {
  max-width: 800px;
  margin: 0 auto;
}

.legal-container h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-secondary);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.legal-meta {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.legal-container h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-top: 32px;
  margin-bottom: 12px;
}

.legal-container p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

.legal-container ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-container li {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 8px;
}

.legal-container strong {
  color: var(--color-text);
}

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

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

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-100%);
    opacity: 0;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--color-border);
    pointer-events: none;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-phone-mockup {
    width: 220px;
    height: 440px;
    border-radius: 28px;
    padding: 14px;
  }

  .hero-phone-screen {
    border-radius: 18px;
  }

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

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

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding: 64px 24px;
  }
}

@media (max-width: 480px) {
  .screenshots-scroll {
    grid-template-columns: 1fr;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}