/* Design Tokens */
:root {
  --color-primary: #E07A3A;
  --color-primary-dark: #C4622A;
  --color-secondary: #1E3A5F;
  --color-secondary-light: #2D5A8A;
  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text: #2C2C2C;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;

  --font-zh: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-zh);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.en {
  font-family: var(--font-en);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-secondary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav-lang a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.nav-lang a:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.nav-lang a.active {
  background: var(--color-secondary);
  color: white;
}

/* Hero */
.hero {
  padding: calc(64px + var(--space-xl)) 0 var(--space-xl);
  background: linear-gradient(135deg, var(--color-bg) 0%, #FFF5F0 100%);
  min-height: 85vh;
  display: flex;
  align-items: center;
}

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

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--color-secondary);
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero-text .slogan {
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.hero-text .desc {
  color: var(--color-text-light);
  font-size: 1.125rem;
}

.hero-visual {
  position: relative;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-primary) 0%, #F4A261 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-visual::before {
  content: '';
  position: absolute;
  width: 80%;
  height: 80%;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.15; }
  50% { transform: scale(1.1); opacity: 0.25; }
}

.hero-icon {
  width: 120px;
  height: 120px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg);
}

.hero-icon svg {
  width: 60px;
  height: 60px;
  color: var(--color-primary);
}

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

.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--space-lg);
}

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

.feature-card {
  background: var(--color-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s var(--ease-out);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, #F4A261 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: white;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-secondary);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* Why Us */
.why-us {
  padding: var(--space-xl) 0;
  background: var(--color-secondary);
  color: white;
}

.why-us .section-title {
  color: white;
}

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

.why-card {
  text-align: center;
  padding: var(--space-lg);
}

.why-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.why-card p {
  color: rgba(255,255,255,0.7);
  font-size: 0.9375rem;
}

/* About */
.about {
  padding: var(--space-xl) 0;
}

.about-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.about-content h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
}

.about-content .tagline {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.about-content .contact {
  font-size: 1.125rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.about-content .address {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Contact */
.contact {
  padding: var(--space-xl) 0;
  background: linear-gradient(135deg, #FFF5F0 0%, var(--color-bg) 100%);
}

.contact-content {
  max-width: 500px;
  margin: 0 auto;
  text-align: center;
}

.contact-content h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}

.contact-content .subtitle {
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.contact-email:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Footer */
.footer {
  padding: var(--space-lg) 0;
  background: var(--color-secondary);
  color: white;
  text-align: center;
}

.footer p {
  color: rgba(255,255,255,0.6);
  font-size: 0.875rem;
}

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

@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-visual {
    max-width: 300px;
    margin: 0 auto;
    order: -1;
  }

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

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