@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500&family=Playfair+Display:wght@400;500;600&display=swap');

:root {
  /* 颜色系统 - 高端家具贸易风格 */
  --color-bg: #FAF9F6;          /* 温暖米白背景 */
  --color-text: #2C2A29;        /* 深木炭灰文字 */
  --color-primary: #8C7A6B;     /* 暖灰褐色主色调 */
  --color-primary-hover: #756559;
  --color-surface: #FFFFFF;     /* 纯白表面 */
  --color-surface-alt: #F0EBE6; /* 浅驼色区块背景 */
  --color-border: #E5E0DA;
  
  /* 字体系统 */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* 过渡动画 */
  --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 1rem;
}

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

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

/* 占位图样式 (纯色块) */
.placeholder-img {
  background-color: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  width: 100%;
}

/* 布局通用类 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 0;
  background-color: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  transition: padding var(--transition-fast);
}

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

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width var(--transition-fast);
}

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

/* 按钮 */
.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  background-color: var(--color-text);
  color: #fff;
  border: 1px solid var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:hover {
  background-color: transparent;
  color: var(--color-text);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
}

.btn-outline:hover {
  background-color: var(--color-text);
  color: #fff;
}

/* 首屏 (Hero) */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.hero-content p {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 2.5rem;
  max-width: 90%;
}

.hero-image {
  height: 600px;
  position: relative;
  overflow: hidden;
}

.hero-image .placeholder-img {
  height: 100%;
  background-color: var(--color-primary);
  color: var(--color-bg);
}

/* 业务展示 (Services / Features) */
.services-section {
  background-color: var(--color-surface);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
}

.section-header p {
  color: var(--color-primary);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.card {
  background-color: var(--color-bg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid var(--color-border);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.card-icon {
  width: 60px;
  height: 60px;
  background-color: var(--color-surface-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.5rem;
  color: var(--color-primary);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card p {
  font-size: 0.95rem;
  color: #666;
}

/* 关于我们 (About Page Layout) */
.page-header {
  padding: 10rem 0 5rem;
  background-color: var(--color-surface-alt);
  text-align: center;
}

.page-header h1 {
  font-size: 3.5rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-image {
  height: 500px;
}

.about-content h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.about-content p {
  margin-bottom: 1.5rem;
  color: #555;
}

/* 联系方式 (Contact Page Layout) */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
}

.contact-info-item {
  margin-bottom: 2.5rem;
}

.contact-info-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.contact-info-item p {
  font-size: 1.1rem;
}

.contact-form {
  background-color: var(--color-surface);
  padding: 3rem;
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

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

/* Footer */
.footer {
  background-color: var(--color-text);
  color: #fff;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: #ccc;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  color: #999;
}

/* 响应式设计 (移动端适配) */
@media (max-width: 992px) {
  .hero-grid, .about-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-content h1 {
    font-size: 3rem;
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 简化版：移动端暂时隐藏导航，可通过补充JS添加汉堡菜单 */
  }
  
  .grid-3, .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-image, .about-image {
    height: 300px;
  }
  
  .section {
    padding: 4rem 0;
  }
}