/* ===== ToDesk 官网克隆 - 全局样式 ===== */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary-color: #1e40af;
  --accent-color: #f59e0b;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-dark: #0f172a;
  --border-color: #e2e8f0;
  --success-color: #10b981;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  --gradient-light: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --max-width: 1280px;
  --header-height: 72px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  color: var(--text-primary);
  line-height: 1.6;
  background: var(--bg-primary);
  overflow-x: hidden;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-color);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  font-weight: 900;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary-color);
  background: var(--bg-secondary);
}

.nav-item.active {
  color: var(--primary-color);
  font-weight: 600;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 240px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}

.nav-dropdown-item {
  display: flex;
  flex-direction: column;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}

.nav-dropdown-item:hover {
  background: var(--bg-secondary);
}

.nav-dropdown-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.nav-dropdown-desc {
  font-size: 13px;
  color: var(--text-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

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

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

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

.btn-xl {
  padding: 18px 36px;
  font-size: 17px;
  border-radius: var(--radius-lg);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

/* ===== Hero Section ===== */
.hero {
  padding: calc(var(--header-height) + 60px) 0 80px;
  background: linear-gradient(180deg, var(--bg-primary) 0%, #f0f7ff 50%, var(--bg-primary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -150px;
  left: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--gradient-light);
  color: var(--primary-color);
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-title span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.hero-stat-item {
  display: flex;
  flex-direction: column;
}

.hero-stat-number {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
}

.hero-stat-label {
  font-size: 14px;
  color: var(--text-light);
}

.hero-visual {
  position: relative;
}

.hero-image-wrapper {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  aspect-ratio: 4/3;
}

.hero-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-float-card {
  position: absolute;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  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 span {
  display: block;
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.hero-float-card strong {
  font-size: 16px;
  color: var(--success-color);
  font-weight: 700;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ===== Section Common ===== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--gradient-light);
  color: var(--primary-color);
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 40px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Feature Grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
}

.feature-icon.blue {
  background: #eff6ff;
  color: #2563eb;
}

.feature-icon.green {
  background: #ecfdf5;
  color: #10b981;
}

.feature-icon.orange {
  background: #fff7ed;
  color: #f59e0b;
}

.feature-icon.purple {
  background: #faf5ff;
  color: #8b5cf6;
}

.feature-icon.pink {
  background: #fdf2f8;
  color: #ec4899;
}

.feature-icon.cyan {
  background: #ecfeff;
  color: #06b6d4;
}

.feature-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Solution Cards ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.solution-card {
  position: relative;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
  overflow: hidden;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.solution-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.solution-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: var(--gradient-primary);
  color: white;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-subtitle {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 32px;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.cta-actions .btn-primary {
  background: white;
  color: var(--primary-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.cta-actions .btn-primary:hover {
  background: #f8fafc;
  transform: translateY(-1px);
}

.cta-actions .btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: white;
}

.cta-actions .btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: #cbd5e1;
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
  color: white;
  margin-bottom: 20px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  opacity: 0.8;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all 0.2s ease;
}

.footer-social a:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 14px;
  opacity: 0.75;
  transition: all 0.2s ease;
}

.footer-links a:hover {
  opacity: 1;
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
  opacity: 0.6;
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-bottom-links a:hover {
  opacity: 1;
  color: var(--primary-light);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 24px 0;
  background: var(--bg-secondary);
  margin-top: var(--header-height);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-secondary);
}

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

.breadcrumb-separator {
  opacity: 0.5;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== Page Header ===== */
.page-header {
  padding: 60px 0 80px;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.page-header-inner {
  max-width: 760px;
}

.page-title {
  font-size: 44px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.page-desc {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== Pricing ===== */
.pricing-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 6px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  width: fit-content;
  margin: 0 auto 48px;
}

.pricing-tab {
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.pricing-tab.active {
  background: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

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

.pricing-card.featured {
  border-color: var(--primary-color);
  position: relative;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 20px;
  background: var(--gradient-primary);
  color: white;
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  white-space: nowrap;
}

.pricing-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 24px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

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

.pricing-amount {
  font-size: 48px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.pricing-period {
  font-size: 14px;
  color: var(--text-light);
}

.pricing-original {
  font-size: 14px;
  color: var(--text-light);
  text-decoration: line-through;
  margin-bottom: 28px;
}

.pricing-features {
  flex: 1;
  margin-bottom: 32px;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--bg-tertiary);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: '✓';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ecfdf5;
  color: var(--success-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  margin-top: 2px;
}

.pricing-card .btn {
  width: 100%;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item:hover {
  border-color: var(--primary-light);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
}

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

.faq-toggle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s ease;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-color);
}

.faq-item.open .faq-toggle {
  transform: rotate(45deg);
  background: var(--primary-color);
  color: white;
}

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

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 24px 24px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== Download Section ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.download-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all 0.3s ease;
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.download-platform-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  background: var(--gradient-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  margin: 0 auto 20px;
}

.download-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.download-version {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 20px;
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ===== Help Categories ===== */
.help-category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}

.help-category-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.help-category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.help-category-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.help-category-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.help-category-count {
  font-size: 13px;
  color: var(--text-light);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info-item {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  transition: all 0.2s ease;
}

.contact-info-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.contact-info-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--gradient-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.contact-info-label {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.contact-info-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary-color);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* ===== About ===== */
.about-timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  display: flex;
  margin-bottom: 48px;
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: calc(50% - 40px);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary-color);
  transform: translateX(-50%);
  border: 4px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-year {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gradient-light);
  color: var(--primary-color);
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  margin-bottom: 12px;
}

.timeline-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 60px 0;
  text-align: center;
}

.stat-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

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

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

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 40px;
  }

  .section-title {
    font-size: 32px;
  }
}

@media (max-width: 768px) {
  .nav,
  .header-actions .btn {
    display: none;
  }

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

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-stats {
    gap: 24px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .feature-grid,
  .pricing-grid,
  .download-grid,
  .solution-grid,
  .help-category-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .stat-number {
    font-size: 32px;
  }

  .page-title {
    font-size: 32px;
  }

  .about-timeline::before {
    left: 24px;
  }

  .timeline-item,
  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    flex-direction: row;
    padding-left: 56px;
  }

  .timeline-content {
    width: 100%;
  }

  .timeline-dot {
    left: 24px;
  }

  .pricing-tabs {
    flex-wrap: wrap;
    width: 100%;
  }

  .cta-title {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

/* ==========================================================================
   UI 修复补丁（解决 CSS 错误与移动端交互 bug）
   ========================================================================== */

/* ① 移动端汉堡菜单按钮 → X 变形动画（原 JS 已 toggle .open，但 CSS 缺失） */
.mobile-menu-btn.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ② 移动端菜单展开：用 class 控制（替代旧 inline-style，避免优先级冲突导致按钮不显示） */
@media (max-width: 768px) {
  .nav.mobile-open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    padding: 12px 24px 8px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    z-index: 999;
    gap: 4px;
  }
  .nav.mobile-open .nav-item {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
  }
  .header-actions.mobile-open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    position: absolute;
    top: calc(100% + 0px); /* 紧跟在 nav 下面，由 nav.mobile-open 占位后再叠加自然效果 —— 实际下面有修正 */
    left: 0;
    right: 0;
    background: var(--bg-primary);
    padding: 8px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    z-index: 998;
  }
  /* 当 nav 也 open 时，修正 header-actions 位置避免重叠 */
  .nav.mobile-open + .header-actions.mobile-open,
  .header-inner .nav.mobile-open ~ .header-actions.mobile-open {
    top: auto;
    margin-top: calc(var(--header-height) - 8px);
  }
  /* 强制移动端展开时按钮可见（之前 .header-actions .btn{display:none} 会隐藏） */
  .header-actions.mobile-open .btn {
    display: inline-flex !important;
    width: 100%;
    justify-content: center;
  }
}

/* ③ 按钮交互状态：active / focus-visible / disabled（全部缺失，导致点击无反馈） */
.btn {
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.btn:active {
  transform: translateY(0) scale(0.97);
}
.btn:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 2px;
}
.btn-primary:active {
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
  filter: brightness(0.95);
}
.btn-secondary:active {
  background: var(--bg-tertiary);
  transform: scale(0.97);
}
.btn-outline:active {
  background: var(--primary-color);
  color: #fff;
}
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
  filter: grayscale(0.2);
}
/* 按钮在 flex 容器内不会被压缩 */
.btn {
  flex-shrink: 0;
}

/* ④ 下载页卡片按钮：铺满整行（之前缺失导致按钮宽窄不一） */
.download-buttons .btn {
  width: 100%;
  justify-content: center;
}
.download-buttons .btn.btn-lg {
  padding: 12px 20px;
}

/* ⑤ Hero CTA 按钮容器：响应式换行 */
.hero-buttons,
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ⑥ 导航栏菜单项内的 span（itemprop name）颜色继承正确 */
.nav-item span {
  color: inherit;
}
.nav-item.active span {
  color: inherit;
}

/* ⑦ 定价 tabs：换行后保持分布均匀 */
.pricing-tabs .pricing-tab {
  flex: 1;
  min-width: 120px;
  text-align: center;
}
.pricing-tab.active {
  color: var(--primary-color);
  font-weight: 700;
  background: var(--bg-primary);
}

/* ⑧ FAQ 可点击区域的光标 & 焦点 */
.faq-question {
  cursor: pointer;
}
.faq-question:focus-visible {
  outline: 2px solid var(--primary-light);
  outline-offset: -2px;
}

/* ⑨ 联系表单输入框聚焦 & 样式（缺失则补） */
.contact-form input,
.contact-form textarea,
.contact-form select {
  font-family: inherit;
}
.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--primary-light) !important;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ⑩ 面包屑间距微调 & 响应式 */
.breadcrumb-inner {
  overflow-x: auto;
  white-space: nowrap;
}

/* ⑪ 定价卡片 featured 样式强化（边框 + 阴影对比不够） */
.pricing-card.featured {
  transform: translateY(-4px);
}
.pricing-card.featured:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 40px -12px rgba(37, 99, 235, 0.25);
}

/* ⑫ 滚动动画：reduce-motion 友好 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}