/* ==========================================================================
   晓明 AI・GEO — GEO优化服务商官方网站
   全局样式表 | Global Stylesheet
   对 SEO/GEO 友好：语义化、轻量化、响应式
   ========================================================================== */

/* --- CSS Variables / Design Tokens --------------------------------------- */
:root {
  /* 品牌色 Brand Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #0f172a;
  --color-accent: #06b6d4;

  /* 中性色 Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* 功能色 Functional */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* 排版 Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas,
    'Liberation Mono', monospace;

  /* 间距 Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* 圆角 Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* 阴影 Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* 过渡 Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  /* 容器 Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* 导航高度 */
  --nav-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-gray-900);
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p { margin-bottom: 1rem; }

/* --- 容器 Container ------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* --- 导航栏 Navigation --------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--nav-height);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-gray-900);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 50px;
  height: 40px;
  /* border-radius: var(--radius-lg); */
  object-fit: cover;
  flex-shrink: 0;
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.main-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-600);
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

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

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-gray-900);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.625rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-white) !important;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

/* 移动端汉堡菜单 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--color-gray-800);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* --- 页脚 Footer --------------------------------------------------------- */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-20) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.footer-brand p {
  margin-top: var(--space-4);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--color-white);
  margin-bottom: var(--space-6);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col a {
  display: block;
  color: var(--color-gray-400);
  font-size: 0.9375rem;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

/* --- 按钮 Buttons -------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.45);
  color: var(--color-white);
}

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

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

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
}

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

.btn-white:hover {
  background: var(--color-gray-100);
  color: var(--color-primary-dark);
}

/* --- Hero Section -------------------------------------------------------- */
.hero {
  position: relative;
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, #f0f7ff 0%, #f8fafc 50%, #ecfeff 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.375rem 1rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 9999px;
  margin-bottom: var(--space-6);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-6);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--color-gray-600);
  margin-bottom: var(--space-8);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 500px;
}

.hero-image {
  width: 100%;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.hero-float-card {
  position: absolute;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  animation: float 3s ease-in-out infinite;
}

.hero-float-card.card-1 {
  top: 10%;
  left: -30px;
  animation-delay: 0s;
}

.hero-float-card.card-2 {
  bottom: 15%;
  right: -20px;
  animation-delay: 1.5s;
}

.hero-float-card .stat {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
}

.hero-float-card .label {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* --- 统计条 Stats Bar ---------------------------------------------------- */
.stats-bar {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-8) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}

.stat-item .stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-item .stat-label {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  margin-top: var(--space-2);
}

/* --- Section 通用 -------------------------------------------------------- */
.section {
  padding: var(--space-24) 0;
}

.section-alt {
  background: var(--color-gray-50);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-16);
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.section-title {
  margin-bottom: var(--space-4);
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  line-height: 1.8;
}

/* --- 服务卡片 Service Cards ---------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.service-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-6);
}

.service-card h3 {
  margin-bottom: var(--space-3);
  font-size: 1.25rem;
}

.service-card p {
  color: var(--color-gray-500);
  font-size: 0.9375rem;
  margin-bottom: var(--space-6);
}

.service-link {
  font-weight: 600;
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
}

.service-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.service-link:hover::after {
  transform: translateX(4px);
}

/* --- GEO vs SEO 对比表 --------------------------------------------------- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-8);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-4) var(--space-6);
  text-align: left;
  font-size: 0.9375rem;
}

.comparison-table thead th {
  background: var(--color-gray-900);
  color: var(--color-white);
  font-weight: 600;
}

.comparison-table tbody tr:nth-child(even) {
  background: var(--color-gray-50);
}

.comparison-table tbody tr:nth-child(odd) {
  background: var(--color-white);
}

.comparison-table tbody td {
  border-bottom: 1px solid var(--color-gray-200);
}

.comparison-table .check {
  color: var(--color-success);
  font-weight: 700;
}

/* --- 流程图 Process Flow ------------------------------------------------ */
.process-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  position: relative;
}

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

.process-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  margin: 0 auto var(--space-4);
}

.process-step h4 {
  margin-bottom: var(--space-2);
}

.process-step p {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

/* --- 案例卡片 Case Cards ------------------------------------------------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.case-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.case-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--color-gray-100);
}

.case-body {
  padding: var(--space-6);
}

.case-category {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: var(--space-3);
}

.case-body h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

.case-body p {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  margin-bottom: var(--space-4);
}

.case-results {
  display: flex;
  gap: var(--space-6);
}

.case-result {
  text-align: center;
}

.case-result .value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-success);
}

.case-result .label {
  font-size: 0.75rem;
  color: var(--color-gray-400);
  text-transform: uppercase;
}

/* --- 博客卡片 Blog Cards ------------------------------------------------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.blog-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.blog-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--color-gray-100);
}

.blog-card-body {
  padding: var(--space-6);
}

.blog-card-date {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  margin-bottom: var(--space-3);
}

.blog-card-body h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
  line-height: 1.5;
}

.blog-card-body h3 a {
  color: var(--color-gray-900);
}

.blog-card-body h3 a:hover {
  color: var(--color-primary);
}

.blog-card-body p {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  margin-bottom: var(--space-4);
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  border-radius: 9999px;
  font-weight: 500;
}

/* --- CTA 区域 ------------------------------------------------------------ */
.cta-section {
  background: linear-gradient(135deg, var(--color-gray-900), #1a1f36);
  color: var(--color-white);
  padding: var(--space-24) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  color: var(--color-white);
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-4);
}

.cta-section p {
  color: var(--color-gray-400);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* --- 关于页面 ------------------------------------------------------------ */
.about-hero {
  background: linear-gradient(135deg, #f0f7ff 0%, #f8fafc 50%, #ecfeff 100%);
  padding: var(--space-20) 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-image {
  width: 100%;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.about-text h2 {
  margin-bottom: var(--space-6);
}

.about-text p {
  color: var(--color-gray-600);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.value-card {
  text-align: center;
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.value-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.value-card h3 {
  margin-bottom: var(--space-2);
}

.value-card p {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
}

/* --- 联系页面 Contact ---------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

.contact-info h2 {
  margin-bottom: var(--space-4);
}

.contact-info p {
  color: var(--color-gray-500);
  margin-bottom: var(--space-8);
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.contact-detail .icon {
  width: 48px;
  height: 48px;
  background: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-detail h4 {
  margin-bottom: var(--space-1);
}

.contact-detail p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.contact-form {
  background: var(--color-white);
  padding: var(--space-8);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
  font-size: 0.9375rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-gray-800);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--color-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* --- 面包屑 Breadcrumb --------------------------------------------------- */
.breadcrumb {
  padding: var(--space-4) 0;
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.breadcrumb a {
  color: var(--color-gray-500);
}

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

.breadcrumb span {
  margin: 0 var(--space-2);
}

.breadcrumb .current {
  color: var(--color-gray-800);
  font-weight: 500;
}

/* --- 页面标题 Page Header ------------------------------------------------ */
.page-header {
  background: linear-gradient(135deg, #f0f7ff 0%, #f8fafc 50%, #ecfeff 100%);
  padding: var(--space-16) 0;
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--space-4);
}

.page-header p {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

/* --- 常见问题 FAQ -------------------------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-6) 0;
}

.faq-question {
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-gray-800);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-answer {
  margin-top: var(--space-4);
  color: var(--color-gray-600);
  line-height: 1.8;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* --- 客户评价 Testimonials ----------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.testimonial-card {
  background: var(--color-white);
  padding: var(--space-8);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.testimonial-text {
  font-size: 1rem;
  color: var(--color-gray-600);
  font-style: italic;
  line-height: 1.8;
  margin-bottom: var(--space-6);
  position: relative;
  padding-left: var(--space-6);
}

.testimonial-text::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -10px;
  font-size: 3rem;
  color: var(--color-primary);
  opacity: 0.2;
  font-style: normal;
  line-height: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.testimonial-author .avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-gray-200);
}

.testimonial-author .name {
  font-weight: 600;
  font-size: 0.9375rem;
}

.testimonial-author .role {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
}

/* --- 博客文章页 ---------------------------------------------------------- */
.blog-post {
  max-width: 800px;
  margin: 0 auto;
}

.blog-post img {
  border-radius: var(--radius-xl);
  margin: var(--space-8) 0;
}

.blog-post h2 {
  margin: var(--space-12) 0 var(--space-4);
}

.blog-post h3 {
  margin: var(--space-8) 0 var(--space-3);
}

.blog-post p {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--color-gray-700);
}

.blog-post ul,
.blog-post ol {
  margin: var(--space-4) 0 var(--space-4) var(--space-6);
  color: var(--color-gray-700);
}

.blog-post li {
  list-style: disc;
  margin-bottom: var(--space-2);
  line-height: 1.7;
}

.blog-post ol li {
  list-style: decimal;
}

.blog-post blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-8) 0;
  background: var(--color-gray-50);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  color: var(--color-gray-600);
  font-style: italic;
}

.blog-post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-gray-400);
  font-size: 0.9375rem;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-gray-200);
}

.blog-post-content {
  line-height: 1.9;
}

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

  .process-flow {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }

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

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

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

  .about-content,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg);
  }

  .main-nav.open {
    display: flex;
  }

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

  .services-grid,
  .blog-grid,
  .cases-grid,
  .testimonials-grid,
  .values-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .section {
    padding: var(--space-16) 0;
  }

  .process-flow {
    grid-template-columns: 1fr;
  }
}

/* --- 可访问性 Accessibility ---------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- 打印样式 Print ------------------------------------------------------ */
@media print {
  .site-header,
  .site-footer,
  .cta-section,
  .mobile-menu-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}