/* 香港粤龍国际物流官网样式 */
/* Design System - Inspired by youparcel.com */

:root {
  /* Colors */
  --color-primary: #0A1628;
  --color-secondary: #1E3A5F;
  --color-accent: #00B4D8;
  --color-accent-light: #48CAE4;
  --color-accent-dark: #0096C7;
  --color-text: #FFFFFF;
  --color-text-muted: #B0B8C4;
  --color-text-dark: #94A3B8;
  --color-bg-dark: #050D1A;
  --color-bg-card: #0F1E32;
  --color-bg-card-hover: #152538;
  --color-border: #1E3A5F;

  /* Typography - Modern English Fonts */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-chinese: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

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

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 400ms ease-out;

  /* Container */
  --container-max: 1280px;
  --container-padding: 1.5rem;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }
.text-center { text-align: center; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
}

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

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  background: transparent;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  position: relative;
  padding: var(--space-sm) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

/* Dropdown Menu */
.nav-dropdown {
  position: relative;
}

.dropdown-arrow {
  font-size: 0.6rem;
  margin-left: var(--space-xs);
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  list-style: none;
}

.dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
  color: var(--color-accent);
  background: var(--color-bg-card);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

.lang-switch:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lang-switch span {
  opacity: 0.6;
  transition: all var(--transition-fast);
}

.lang-switch span.active {
  opacity: 1;
  color: var(--color-accent);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: url('../images/hero-bg.jpg') center center / cover no-repeat;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 22, 40, 0.9) 0%,
    rgba(15, 30, 50, 0.85) 50%,
    rgba(10, 22, 40, 0.9) 100%
  );
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, var(--color-accent) 1px, transparent 1px),
    radial-gradient(circle at 80% 20%, var(--color-accent) 1px, transparent 1px),
    radial-gradient(circle at 40% 80%, var(--color-accent) 1px, transparent 1px);
  background-size: 100px 100px, 150px 150px, 200px 200px;
  animation: float 20s ease-in-out infinite;
  opacity: 0.3;
  z-index: 1;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-2xl) var(--container-padding);
  max-width: 900px;
}

.hero-title {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero-badge {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background: rgba(0, 180, 216, 0.15);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--space-lg);
}

.hero-slogan {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xl);
  color: var(--color-text-muted);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* Stats Section */
.stats {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-card);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.stat-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.stat-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.stat-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Features Section */
.features {
  padding: var(--space-2xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-label {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.section-title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  background: var(--color-bg-card-hover);
}

.feature-image {
  width: 100%;
  height: 180px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-lg);
  background: var(--color-primary);
}

.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.feature-card:hover .feature-image img {
  transform: scale(1.05);
}

.feature-image svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Feature image animations */
.feature-image circle {
  animation: pulse 2s ease-in-out infinite;
}

.feature-image circle:nth-child(2) { animation-delay: 0s; }
.feature-image circle:nth-child(3) { animation-delay: 0.3s; }
.feature-image circle:nth-child(4) { animation-delay: 0.6s; }
.feature-image circle:nth-child(5) { animation-delay: 0.9s; }

.feature-image ellipse {
  animation: ripple 3s ease-out infinite;
  transform-origin: center;
}

.feature-image ellipse:nth-of-type(1) { animation-delay: 0s; }
.feature-image ellipse:nth-of-type(2) { animation-delay: 0.5s; }
.feature-image ellipse:nth-of-type(3) { animation-delay: 1s; }

.feature-image rect {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.feature-image rect:nth-of-type(1) { animation-delay: 0.1s; }
.feature-image rect:nth-of-type(2) { animation-delay: 0.2s; }
.feature-image rect:nth-of-type(3) { animation-delay: 0.3s; }
.feature-image rect:nth-of-type(4) { animation-delay: 0.4s; }
.feature-image rect:nth-of-type(5) { animation-delay: 0.5s; }

.feature-image line {
  animation: dash 2s linear infinite;
  stroke-dashoffset: 20;
}

.feature-image text {
  animation: fadeIn 0.5s ease-out forwards;
  opacity: 0;
  animation-delay: 0.6s;
}

@keyframes pulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

@keyframes ripple {
  0% {
    opacity: 0.3;
    transform: scale(0.95);
  }
  50% {
    opacity: 0.8;
    transform: scale(1);
  }
  100% {
    opacity: 0.3;
    transform: scale(0.95);
  }
}

@keyframes dash {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.feature-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
}

.feature-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

.feature-desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.feature-link {
  color: var(--color-accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.feature-link:hover {
  gap: var(--space-md);
}

/* Services Section */
.services-section {
  padding: var(--space-2xl) 0;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.service-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  background: var(--color-bg-card-hover);
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.service-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.service-list {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-lg);
}

.service-list li {
  padding: var(--space-xs) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: var(--space-lg);
}

.service-list li::before {
  content: '☀';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
}

.service-link {
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--font-size-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.service-link:hover {
  gap: var(--space-md);
}

/* Industries Section */
.industries-section {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-card);
}

.industries-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.industry-tag {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.industry-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* About Section */
.about-section {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-card);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-content h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-lg);
  font-weight: 700;
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.about-features {
  margin-bottom: var(--space-xl);
}

.about-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.check-icon {
  color: var(--color-accent);
  font-weight: 700;
}

/* CTA Section */
.cta-section {
  padding: var(--space-2xl) 0;
  background: linear-gradient(135deg, var(--color-accent-dark) 0%, var(--color-accent) 100%);
  text-align: center;
}

.cta-section h2 {
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
  font-weight: 700;
}

.cta-section p {
  margin-bottom: var(--space-xl);
  color: var(--color-primary);
  opacity: 0.8;
}

.cta-buttons {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-section .btn-primary {
  background: var(--color-primary);
  color: var(--color-text);
}

.cta-section .btn-primary:hover {
  background: var(--color-secondary);
}

.btn-outline-dark {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline-dark:hover {
  background: var(--color-primary);
  color: var(--color-text);
}

/* Page Header */
.page-header {
  padding: calc(var(--space-2xl) + 80px) 0 var(--space-2xl);
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%);
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header p {
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
}

/* Content Sections */
.content-section {
  padding: var(--space-2xl) 0;
}

.content-section:nth-child(even) {
  background: var(--color-bg-card);
}

/* Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.advantage-card {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: all var(--transition-base);
}

.advantage-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.advantage-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.advantage-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.advantage-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* System Architecture */
.system-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.system-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.system-card h4 {
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.system-card p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* Process Steps */
.process-steps {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-top: var(--space-xl);
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--color-border);
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.step-title {
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.step-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.contact-info {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.contact-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.contact-value {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

/* Contact Form */
.contact-form {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
}

.form-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-xl);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* Footer */
.footer {
  padding: var(--space-2xl) 0 var(--space-xl);
  background: var(--color-primary);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer-brand p {
  color: var(--color-text-muted);
  margin-top: var(--space-lg);
}

.footer-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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

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

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

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

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
  }

  .navbar .container {
    flex-wrap: wrap;
    align-items: center;
    padding: var(--space-md) var(--container-padding);
  }

  .nav-logo {
    order: 1;
  }

  .nav-toggle {
    display: flex;
    order: 3;
  }

  .nav-actions {
    order: 2;
    gap: var(--space-sm);
  }

  .nav-actions .lang-switch {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
  }

  .nav-actions .btn-sm {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    z-index: 999;
    order: 4;
    width: 100%;
  }

  .nav-menu.active {
    display: flex;
  }

  /* Mobile dropdown */
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    margin-top: var(--space-sm);
    padding: var(--space-sm);
  }

  .nav-dropdown .dropdown-arrow {
    display: none;
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .stat-number {
    font-size: 2.5rem;
  }

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

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

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

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

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

  .process-steps {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .process-steps::before {
    display: none;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .hero-buttons,
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  /* 移动端额外优化 */
  .navbar .nav-logo-text {
    font-size: var(--font-size-base);
  }

  .navbar .nav-link {
    padding: var(--space-sm);
    font-size: var(--font-size-sm);
  }

  .lang-switch {
    white-space: nowrap;
  }

  .lang-switch span:not(:first-child):not(:last-child) {
    display: none;
  }

  .industries-grid {
    gap: var(--space-sm);
  }

  .industry-tag {
    font-size: var(--font-size-xs);
    padding: var(--space-xs) var(--space-md);
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }