/* CSS Variables for Color Scheme */
:root {
  /* Primary Colors */
  --primary-color: #8B4513; /* Rich brown */
  --primary-dark: #6B3410;
  --primary-light: #A0522D;
  
  /* Secondary Colors */
  --secondary-color: #E6B89C; /* Soft peach */
  --accent-color: #D4AF37; /* Gold accent */
  --accent-light: #F0E68C;
  
  /* Neutral Colors */
  --bg-color: #F9F6F3 ;
  --card-bg: #FFFFFF;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #999999;
  --border-color: #E8E0D5;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
  
  /* Typography */
  --font-primary: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Global Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

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

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

ul {
  list-style: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

/* Header */
.header {
  background: var(--card-bg);
  color: var(--text-primary);
  padding: 4px 0;
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-normal);
}

.header.scrolled {
  padding: var(--spacing-lg) 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.container {
  width: 92%;
  max-width: 1200px;
  margin: 0 auto;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-color);
  font-family: var(--font-heading);
  display: flex;
  align-items: center;
}

.logo img {
  height: 120px;
}

.nav {
  display: flex;
  gap: var(--spacing-xl);
}

.nav a {
  font-size: 1rem;
  font-weight: 500;
  position: relative;
  padding: var(--spacing-xs) 0;
}

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

.nav a:hover::after {
  width: 100%;
}

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-primary);
}

/* 内页两栏布局 */
.page {
  padding: var(--spacing-xxl) 0;
}

.page-inner {
  display: flex;
  gap: var(--spacing-xl);
}

/* 左侧侧边栏 */
.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  position: sticky;
  top: 120px;
  height: fit-content;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.content {
  flex: 1;
  min-width: 0;
}

.sidebar h3 {
  font-size: 1.25rem;
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--secondary-color);
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.sidebar-menu li {
  margin: var(--spacing-sm) 0;
}

.sidebar-menu a {
  font-size: 1rem;
  display: block;
  padding: var(--spacing-sm) 0;
  position: relative;
  padding-left: var(--spacing-md);
}

.sidebar-menu a::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: bold;
}

.sidebar-menu a:hover {
  color: var(--primary-color);
  padding-left: calc(var(--spacing-md) + 4px);
}

/* 顶部导航菜单激活状态 */
.nav a.active {
  color: #8B4513; /* 主色调 */
}

.nav a.active::after {
  width: 100%;
  background: #8B4513;
}

/* 侧边栏菜单激活状态 */
.sidebar-menu a.active {
  color: #8B4513; 
  font-weight: 600;
}

.sidebar-menu a.active::before {
  color: #8B4513;
}

.content h1 {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--secondary-color);
  color: var(--primary-color);
}

/* 产品网格 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-lg);
}

.product-item {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.product-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.product-img {
  height: 240px;
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
  position: relative;
  overflow: hidden;
}

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

.product-item:hover .product-img img {
  transform: scale(1.05);
}

.product-info {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-info h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.product-info p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  flex: 1;
}

.product-price {
  font-weight: 600;
  color: var(--primary-color);
  margin-top: var(--spacing-md);
  font-size: 1.1rem;
}

.product-action {
  margin-top: var(--spacing-md);
}

/* 产品详情 —— 图片 + 视频 区域 */
.product-detail {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.detail-images {
  width: 400px;
  flex-shrink: 0;
}

.detail-img-main {
  height: 400px;
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: background-image 0.3s ease;
}

.detail-img-main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-img-thumbs {
  display: flex;
  gap: var(--spacing-sm);
}

.detail-img-thumb {
  width: 70px;
  height: 70px;
  background: #f5f5f5;
  border-radius: var(--border-radius-md);
  overflow: the hidden;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.detail-img-thumb:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow);
}

.detail-img-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-video {
  margin-top: var(--spacing-md);
  height: 220px;
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  position: relative;
  overflow: hidden;
}

.detail-video::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.1);
  transition: opacity var(--transition-fast);
}

.detail-video:hover::before {
  opacity: 0.2;
}

.detail-info {
  flex: 1;
}

.detail-info h1 {
  border: none;
  padding: 0;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.detail-specs {
  margin: var(--spacing-lg) 0;
  background: var(--bg-color);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
}

/* ========== 已修复：产品参数排版 ========== */
.spec-item {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px dashed var(--border-color);
  display: flex;
  gap: 10px;       /* 只加这一个间距 */
  align-items: baseline;
}
.spec-item strong {
  white-space: nowrap;
  flex-shrink: 0;
}

.spec-item span:last-child {
  flex: 1;
  text-align: left;
}

.spec-label {
  font-weight: 500;
  color: var(--text-primary);
}

.spec-value {
  color: var(--text-secondary);
}
/* ======================================== */

/* 表单 */
.inquiry-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.inquiry-form input,
.inquiry-form textarea {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  font-family: var(--font-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--card-bg);
  width: 100%;
  box-sizing: border-box;
}

/* 表单元素美化 */
.inquiry-form input {
  min-height: 48px;
}

.inquiry-form textarea {
  min-height: 150px;
  resize: vertical;
  line-height: 1.5;
}

/* 表单输入焦点增强 */
.inquiry-form input:focus,
.inquiry-form textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.1);
}

/* 表单提交按钮增强 */
.inquiry-form .btn {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xxl);
  font-size: 1.1rem;
  font-weight: 600;
  align-self: flex-start;
}

.inquiry-form input.error,
.inquiry-form textarea.error {
  border-color: #dc2626;
}

.error-message {
  color: #dc2626;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: block;
}

.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 69, 19, 0.3);
  color: #fff;
}

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

.btn-secondary:hover {
  background: #d4a88a;
  color: var(--text-primary);
}

/* 首页 Banner */
.banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  color: #fff;
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1IiBoZWlnaHQ9IjUiPgo8cmVjdCB3aWR0aD0iNSIgaGVpZ2h0PSI1IiBmaWxsPSIjZmZmZmZmMTAiPjwvcmVjdD4KPHBhdGggZD0iTTAgNUw1IDBaTTYgNEw0IDZaTS0xIDFMMSAtMVoiIHN0cm9rZT0iI2ZmZmZmZjIwIiBzdHJva2Utd2lkdGg9IjEiPjwvcGF0aD4KPC9zdmc+') repeat;
  opacity: 0.1;
}

.banner h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  color: #fff;
  position: relative;
  z-index: 1;
}
.banner h2 {
  color: #fff;
}

.banner p {
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  position: relative;
  z-index: 1;
}

.banner .btn {
  position: relative;
  z-index: 1;
  background: #fff;
  color: var(--primary-color);
}

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

/* 底部 */
.footer {
  background: var(--primary-dark);
  color: #fff;
  text-align: center;
  padding: var(--spacing-xxl) 0;
  margin-top: var(--spacing-xxl);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1IiBoZWlnaHQ9IjUiPgo8cmVjdCB3aWR0aD0iNSIgaGVpZ2h0PSI1IiBmaWxsPSIjZmZmZmZmMTAiPjwvcmVjdD4KPHBhdGggZD0iTTAgNUw1IDBaTTYgNEw0IDZaTS0xIDFMMSAtMVoiIHN0cm9rZT0iI2ZmZmZmZjIwIiBzdHJva2Utd2lkdGg9IjEiPjwvcGF0aD4KPC9zdmc+') repeat;
  opacity: 0.1;
}

.footer p {
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  z-index: 1;
}

/* 动画和交互效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式 */
@media (max-width: 1200px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .product-detail {
    flex-direction: column;
  }
  
  .detail-images {
    width: 100%;
  }
  
  .detail-img-main {
    height: 350px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .nav {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .page-inner {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    position: static;
    margin-bottom: var(--spacing-lg);
  }
  
  .product-grid {
    grid-template-columns: 1fr;
  }
  
  .content {
    padding: var(--spacing-lg);
  }
  
  .banner {
    padding: 80px 0;
  }
  
  .banner h1 {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .product-img {
    height: 200px;
  }
  
  .detail-img-main {
    height: 280px;
  }
  
  .banner h1 {
    font-size: 2rem;
  }
}

/* Home Page Styles */
.banner {
  background:#6B3410;
  color:#fff;
  padding:80px 0;
  text-align:center;
}

.banner h1 {
  font-size:32px;
  margin-bottom:15px;
}


.banner p {
  max-width:800px;
  margin:0 auto 25px;
  font-size:16px;
}

.section {
  padding:60px 0;
}

.section h2 {
  text-align:center;
  margin-bottom:40px;
  font-size:26px;
  color:#333;
}

.grid-3 {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:25px;
}

.card {
  background:#fff;
  padding:25px;
  border-radius:8px;
  text-align:center;
  box-shadow:0 2px 8px rgba(0,0,0,0.05);
}

.card img {
  width:100%;
  height:200px;
  object-fit:cover;
  border-radius:6px;
  margin-bottom:15px;
}

.testimonials {
  background:#f8f8f8;
}

.quote {
  font-style:italic;
  margin-bottom:10px;
}

.name {
  font-weight:bold;
  color:#6B3410;
}

.advantage {
  text-align:center;
  padding:20px;
}

.advantage h4 {
  margin:15px 0 10px;
  color:#6B3410;
}

@media (max-width:768px) {
  .grid-3 {
    grid-template-columns:1fr;
  }
}