/* GEO 优化网站 - 全局样式 */

/* ==================== 变量定义 ==================== */
:root {
  /* 颜色 */
  --color-white: #FFFFFF;
  --color-bg-light: #F9FAFB;
  --color-bg-gray: #F5F5F5;
  --color-border: #E5E7EB;
  --color-text-primary: #1F2937;
  --color-text-secondary: #6B7280;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-success: #10B981;
  --color-warning: #F59E0B;

  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;

  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --spacing-3xl: 96px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);

  /* 导航高度 */
  --nav-height: 64px;
}

/* ==================== 重置样式 ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

/* ==================== 排版 ==================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 {
  font-size: 48px;
  font-weight: 700;
}

h2 {
  font-size: 32px;
}

h3 {
  font-size: 24px;
}

h4 {
  font-size: 20px;
}

p {
  color: var(--color-text-secondary);
}

/* ==================== 容器 ==================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title h2 {
  margin-bottom: var(--spacing-sm);
}

.section-title p {
  font-size: 18px;
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 var(--spacing-md);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

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

.btn-white:hover {
  background-color: var(--color-bg-gray);
  color: var(--color-accent-hover);
}

.btn-lg {
  height: 52px;
  padding: 0 var(--spacing-lg);
  font-size: 16px;
}

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
}

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

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar-link {
  color: var(--color-text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--color-accent);
}

.navbar-cta {
  margin-left: var(--spacing-md);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all 0.3s ease;
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md);
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 999;
}

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

.mobile-menu .navbar-link {
  display: block;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu .btn {
  margin-top: var(--spacing-sm);
}

/* ==================== Hero 区域 ==================== */
.hero {
  padding-top: calc(var(--nav-height) + var(--spacing-3xl));
  padding-bottom: var(--spacing-3xl);
  background-color: var(--color-white);
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto var(--spacing-lg);
}

.hero .btn-group {
  justify-content: center;
}

/* ==================== 卡片 ==================== */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.card-icon svg {
  width: 100%;
  height: 100%;
  stroke-width: 1.5;
}

.card h3 {
  font-size: 20px;
  margin-bottom: var(--spacing-sm);
}

.card p {
  font-size: 15px;
  line-height: 1.7;
}

/* ==================== 网格布局 ==================== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ==================== 标签云 ==================== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-bg-gray);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

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

.tag-primary {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-accent);
}

.tag-lg {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 15px;
}

/* ==================== 价格卡片 ==================== */
.price-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.price-card .price {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: var(--spacing-md) 0;
}

.price-card .price span {
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.price-card .price-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.price-card .features {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.price-card .feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.price-card .feature-item:last-child {
  border-bottom: none;
}

.price-card .feature-icon {
  width: 20px;
  height: 20px;
  color: var(--color-success);
  flex-shrink: 0;
  margin-top: 2px;
}

.price-card .feature-icon svg {
  width: 100%;
  height: 100%;
}

/* ==================== FAQ 手风琴 ==================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--spacing-md) 0;
  background: none;
  border: none;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  transition: transform 0.3s ease;
}

.faq-icon svg {
  width: 100%;
  height: 100%;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding-bottom: var(--spacing-md);
}

.faq-answer p {
  font-size: 15px;
  line-height: 1.7;
}

/* ==================== 流程步骤 ==================== */
.process-steps {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

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

.process-step::after {
  content: '';
  position: absolute;
  top: 24px;
  right: -50%;
  width: 100%;
  height: 2px;
  background-color: var(--color-border);
  z-index: 0;
}

.process-step:last-child::after {
  display: none;
}

.process-number {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.process-step h4 {
  margin-bottom: var(--spacing-xs);
}

.process-step p {
  font-size: 14px;
}

/* ==================== 联系信息 ==================== */
.contact-card {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
}

.contact-icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 100%;
  height: 100%;
  stroke-width: 1.5;
}

.contact-info h4 {
  margin-bottom: var(--spacing-xs);
}

.contact-info p {
  font-size: 15px;
}

/* ==================== 表单 ==================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-label .required {
  color: #EF4444;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px var(--spacing-sm);
  font-size: 15px;
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.form-input::placeholder,
.form-textarea::placeholder {
  color: #9CA3AF;
}

/* ==================== 二维码弹窗 ==================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  text-align: center;
  max-width: 320px;
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
}

.modal-close:hover {
  color: var(--color-text-primary);
}

.modal-title {
  font-size: 18px;
  margin-bottom: var(--spacing-md);
}

.modal-qr {
  width: 200px;
  height: 200px;
  margin: 0 auto var(--spacing-md);
  background-color: var(--color-bg-gray);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-qr img {
  max-width: 100%;
  max-height: 100%;
}

/* ==================== 页脚 ==================== */
.footer {
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-info p {
  font-size: 14px;
}

.footer-contact {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer-contact a {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

.footer-contact svg {
  width: 18px;
  height: 18px;
}

.footer-copyright {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-copyright p {
  font-size: 13px;
}

/* ==================== 页面标题区 ==================== */
.page-header {
  padding-top: calc(var(--nav-height) + var(--spacing-3xl));
  padding-bottom: var(--spacing-xl);
  background-color: var(--color-bg-light);
  text-align: center;
}

.page-header h1 {
  font-size: 40px;
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  font-size: 18px;
}

/* ==================== 概念说明区块 ==================== */
.concept-block {
  background-color: var(--color-bg-gray);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.concept-block h3 {
  margin-bottom: var(--spacing-md);
}

.concept-block p {
  line-height: 1.8;
}

/* ==================== 搜索框 ==================== */
.search-box {
  position: relative;
  max-width: 400px;
  margin: 0 auto var(--spacing-xl);
}

.search-box input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  font-size: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
}

.search-box input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.search-box .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
}

.search-box .search-icon svg {
  width: 100%;
  height: 100%;
}

/* ==================== 表格 ==================== */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-bg-gray);
  font-weight: 600;
  font-size: 14px;
}

td {
  font-size: 15px;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: var(--color-bg-gray);
}

/* ==================== 比较表格 ==================== */
.comparison-table th:first-child,
.comparison-table td:first-child {
  width: 200px;
}

/* ==================== 空状态 ==================== */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-secondary);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  opacity: 0.5;
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 28px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps {
    flex-wrap: wrap;
  }

  .process-step::after {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 24px;
    --spacing-2xl: 40px;
    --spacing-3xl: 64px;
  }

  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 26px;
  }

  h3 {
    font-size: 20px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-toggle {
    display: flex;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .process-steps {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .process-step {
    display: flex;
    align-items: flex-start;
    text-align: left;
    gap: var(--spacing-md);
  }

  .process-step::after {
    display: none;
  }

  .process-number {
    margin: 0;
    flex-shrink: 0;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-contact {
    justify-content: center;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    width: 100%;
  }

  .page-header h1 {
    font-size: 32px;
  }

  .price-card .price {
    font-size: 40px;
  }
}

/* ==================== 辅助类 ==================== */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}