:root {
  --primary-color: #0b2239; /* 深蓝色，代表沉稳专业 */
  --accent-color: #d4af37; /* 金色，代表"优越"和高级感 */
  --text-dark: #333333;
  --text-light: #f5f5f5;
  --bg-light: #ffffff;
  --bg-gray: #f8f9fa;
  --font-title: 'Playfair Display', serif;
  --font-body: 'Noto Sans SC', 'Inter', sans-serif;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background-color: var(--bg-light);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--primary-color);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  z-index: 1000;
  transition: var(--transition);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo span {
  color: var(--accent-color);
}

.main-nav {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  font-size: 1rem;
  position: relative;
  padding-bottom: 5px;
}

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

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

.lang-switch {
  cursor: pointer;
  padding: 5px 10px;
  border: 1px solid var(--accent-color);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--primary-color);
  background: transparent;
  transition: var(--transition);
}

.lang-switch:hover {
  background-color: var(--accent-color);
  color: white;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

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

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

/* Footer */
.site-footer {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: 60px 0 20px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h3 {
  color: var(--accent-color);
  margin-bottom: 20px;
  font-size: 1.2rem;
}

.footer-col p, .footer-col ul {
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 2;
}

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

.footer-col ul li a:hover {
  color: var(--accent-color);
  padding-left: 5px;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  opacity: 0.7;
}

/* Utilities */
.section-title {
  text-align: center;
  margin-bottom: 50px;
  font-size: 2.5rem;
  position: relative;
  padding-bottom: 15px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--accent-color);
}

.section-subtitle {
  text-align: center;
  color: #666;
  margin-top: -30px;
  margin-bottom: 50px;
  font-size: 1.1rem;
}

section {
  padding: 80px 0;
}

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