/* 微聊品牌 - 全局样式 */
:root {
  --primary: #07C160;
  --primary-dark: #05A34E;
  --primary-light: #E8F8F0;
  --secondary: #1e293b;
  --secondary-light: #334155;
  --accent: #10b981;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand .logo-icon {
  width: 36px;
  height: 36px;
}

.navbar-brand .logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

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

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

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

.nav-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--primary);
  color: #fff !important;
  border-radius: 50px;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.nav-download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(7,193,96,0.3);
}

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero 区域 */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0fdf4 50%, var(--bg-light) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(7,193,96,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

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

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

.hero-logo {
  width: 160px;
  height: auto;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  color: var(--primary);
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(7,193,96,0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--bg-white);
  color: var(--text-primary);
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-phone-mockup {
  width: 320px;
  height: 640px;
  background: var(--bg-white);
  border-radius: 40px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12);
  border: 4px solid var(--border);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

.phone-header {
  padding: 20px 20px 12px;
  background: var(--primary);
  color: #fff;
  text-align: center;
}

.phone-header h3 {
  font-size: 14px;
  font-weight: 600;
}

.phone-header p {
  font-size: 11px;
  opacity: 0.8;
  margin-top: 2px;
}

.phone-body {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #f5f5f5;
}

.phone-message {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.phone-message.received {
  align-self: flex-start;
}

.phone-message.sent {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.phone-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  flex-shrink: 0;
}

.phone-bubble {
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 13px;
  max-width: 200px;
}

.phone-bubble.received {
  background: #fff;
  border-bottom-left-radius: 4px;
}

.phone-bubble.sent {
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 4px;
}

/* 特色区域 */
.features {
  padding: 100px 0;
  background: var(--bg-white);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border);
  background: var(--bg-white);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--primary-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 28px;
  color: var(--primary);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 下载区域 */
.download-section {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
}

.download-section .section-header h2 {
  color: #fff;
}

.download-section .section-header p {
  color: rgba(255,255,255,0.85);
}

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

.download-card {
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.15);
}

.download-card:hover {
  background: rgba(255,255,255,0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.15);
}

.download-card .platform-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.download-card .version {
  font-size: 14px;
  opacity: 0.8;
  margin-bottom: 4px;
}

.download-card .size {
  font-size: 13px;
  opacity: 0.6;
  margin-bottom: 20px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: #fff;
  color: var(--primary) !important;
  border-radius: 50px;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.download-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* CTA 区域 */
.cta-section {
  padding: 80px 0;
  background: var(--bg-white);
}

.cta-card {
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0fdf4 100%);
  border-radius: 24px;
  padding: 60px;
  text-align: center;
  border: 1px solid rgba(7,193,96,0.15);
}

.cta-card h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-card p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* 关于页 */
.about-hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0fdf4 50%, var(--bg-light) 100%);
  text-align: center;
}

.about-hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
}

.about-hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.about-story {
  padding: 80px 0;
  background: var(--bg-white);
}

.about-story .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-story h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
}

.about-story p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-image-placeholder {
  width: 100%;
  height: 400px;
  background: var(--primary-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--primary);
}

.mission-vision {
  padding: 80px 0;
  background: var(--bg-light);
}

.mission-vision .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.mission-box,
.vision-box {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
}

.mission-box h3,
.vision-box h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mission-box p,
.vision-box p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.timeline {
  padding: 80px 0;
  background: var(--bg-white);
}

.timeline h2 {
  text-align: center;
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 60px;
}

.timeline-list {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-light);
}

.timeline-item {
  display: flex;
  gap: 32px;
  margin-bottom: 40px;
  position: relative;
}

.timeline-dot {
  width: 42px;
  height: 42px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.timeline-content h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-content .date {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 团队部分 */
.team-section {
  padding: 80px 0;
  background: var(--bg-light);
}

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

.team-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 32px;
  color: var(--primary);
}

.team-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.team-card .role {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.team-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 联系页 */
.contact-hero {
  padding: 140px 0 60px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0fdf4 50%, var(--bg-light) 100%);
  text-align: center;
}

.contact-hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
}

.contact-hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.contact-content {
  padding: 80px 0;
  background: var(--bg-white);
}

.contact-content .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
}

.contact-info p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-detail-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary);
  flex-shrink: 0;
}

.contact-detail-text h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
}

.contact-detail-text p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
}

.contact-form {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 40px 32px;
}

.contact-form h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-white);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(7,193,96,0.1);
}

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

.submit-btn {
  width: 100%;
  padding: 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.submit-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.social-links {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

.social-link {
  width: 48px;
  height: 48px;
  background: var(--bg-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-secondary);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.social-link:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* 页脚 */
.footer {
  background: var(--secondary);
  color: #fff;
  padding: 60px 0 0;
}

.footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .footer-logo {
  width: 120px;
  height: auto;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  max-width: 300px;
}

.footer h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
  color: #fff;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* FAQ 区域 */
.faq-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  border: 1px solid var(--border);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 500;
  font-size: 16px;
  transition: var(--transition);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  color: var(--text-primary);
}

.faq-question:hover {
  background: var(--bg-light);
}

.faq-question .faq-icon {
  transition: var(--transition);
  font-size: 20px;
  color: var(--text-muted);
}

.faq-item.active .faq-question .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 200px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Toast 消息 */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--secondary);
  color: #fff;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 9999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer .container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .navbar .container {
    height: 60px;
  }
  
  .hamburger {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }
  
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .hero {
    padding: 100px 0 60px;
  }
  
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-phone-mockup {
    display: none;
  }
  
  .hero-logo {
    margin: 0 auto 20px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .section-header h2 {
    font-size: 28px;
  }
  
  .download-grid {
    grid-template-columns: 1fr;
  }
  
  .about-story .container {
    grid-template-columns: 1fr;
  }
  
  .mission-vision .container {
    grid-template-columns: 1fr;
  }
  
  .team-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-content .container {
    grid-template-columns: 1fr;
  }
  
  .cta-card {
    padding: 40px 24px;
  }
  
  .footer .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-brand p {
    max-width: 100%;
  }
  
  .footer-links {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 14px 28px;
    font-size: 14px;
  }
  
  .navbar-brand .logo-text {
    font-size: 18px;
  }
}
```

```javascript