:root {
  --primary: #2d5be3;
  --primary-dark: #1a3fb0;
  --primary-light: #4a7af5;
  --accent: #00d4aa;
  --bg: #f8fafc;
  --bg-dark: #0f172a;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-white: #f1f5f9;
  --border: #e2e8f0;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

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

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(45,91,227,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45,91,227,0.4);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.8);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 10px rgba(0,0,0,0.05);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

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

.nav-desktop {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  padding: 8px 0;
  position: relative;
}

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

.nav-link:hover {
  color: var(--primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  padding: 12px;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1101;
}

.nav-toggle .bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  position: absolute;
  left: 12px;
  transition: all 0.4s cubic-bezier(0.68, -0.6, 0.32, 1.6);
}

.nav-toggle .bar-1 {
  top: 15px;
}

.nav-toggle .bar-2 {
  top: 23px;
  width: 18px;
}

.nav-toggle .bar-3 {
  top: 31px;
  width: 12px;
}

.nav-toggle:hover .bar-2 {
  width: 24px;
}

.nav-toggle:hover .bar-3 {
  width: 24px;
}

.nav-toggle.active .bar {
  background: #fff;
}

.nav-toggle.active .bar-1 {
  top: 23px;
  transform: rotate(45deg);
}

.nav-toggle.active .bar-2 {
  opacity: 0;
  transform: translateX(10px);
}

.nav-toggle.active .bar-3 {
  top: 23px;
  width: 24px;
  transform: rotate(-45deg);
}

.nav-mobile {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  max-width: 80%;
  height: 100vh;
  z-index: 1050;
  background: linear-gradient(180deg, #0a1628 0%, #0f172a 50%, #1a2744 100%);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.35s ease;
  box-shadow: -5px 0 30px rgba(0,0,0,0.3);
}

.nav-mobile.active {
  transform: translateX(0);
}

.nav-mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1049;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.nav-mobile-overlay.active {
  opacity: 1;
  visibility: visible;
}

.nav-mobile-bg {
  display: none;
}

.nav-mobile-content {
  position: relative;
  z-index: 2;
  width: 100%;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  padding: 80px 24px 30px;
}

.nav-mobile-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-mobile-title {
  display: block;
  font-size: 11px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.nav-mobile-subtitle {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -1px;
  line-height: 1;
}

.nav-mobile-links {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  background: transparent;
}

.nav-link-m {
  display: flex;
  align-items: center;
  padding: 14px 0;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  position: relative;
  transition: all 0.3s ease;
}

.nav-link-m::before {
  content: attr(data-index);
  font-size: 11px;
  font-weight: 700;
  color: #00d4aa;
  margin-right: 12px;
  opacity: 0.8;
}

.nav-link-m:hover {
  color: #00d4aa;
  padding-left: 8px;
}

.nav-mobile-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.nav-mobile-cta {
  width: 100%;
  padding: 14px 24px;
  background: #00d4aa;
  color: #0a1628;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  margin-bottom: 16px;
}

.nav-mobile-cta:active {
  transform: scale(0.98);
}

.nav-mobile-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 12px;
}

.nav-mobile-brand img {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  opacity: 0.6;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 20px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(45,91,227,0.7) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  color: #fff;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 24px;
  opacity: 0.8;
}

.breadcrumb a {
  color: #fff;
}

.breadcrumb .sep {
  opacity: 0.5;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.hero-desc {
  font-size: 18px;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 36px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.section {
  padding: 80px 0;
}

.section:nth-child(even) {
  background: #fff;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
  color: var(--text);
}

.section-intro {
  text-align: center;
  font-size: 17px;
  color: var(--text-light);
  max-width: 800px;
  margin: 0 auto 48px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 480px;
  gap: 50px;
  align-items: start;
}

.about-text p {
  margin-bottom: 20px;
  color: var(--text);
}

.about-sub {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text);
}

.feature-list {
  margin-top: 16px;
}

.feature-list li {
  padding: 12px 0;
  padding-left: 24px;
  position: relative;
  border-bottom: 1px solid var(--border);
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.about-img img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: auto;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.download-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  transition: all var(--transition);
  border: 1px solid var(--border);
}

.download-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.download-icon {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.download-icon img {
  max-height: 100%;
  width: auto;
  object-fit: contain;
}

.download-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text);
}

.download-card p {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.download-info {
  text-align: left;
  margin-bottom: 20px;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius-sm);
}

.download-info li {
  font-size: 14px;
  color: var(--text-light);
  padding: 6px 0;
}

.download-notice {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  padding: 24px 30px;
  border-radius: var(--radius);
  border-left: 4px solid #f59e0b;
}

.download-notice h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: #92400e;
}

.download-notice p {
  font-size: 15px;
  color: #78350f;
}

.app-showcase {
  margin-top: 48px;
  text-align: center;
}

.app-showcase h3 {
  font-size: 22px;
  margin-bottom: 24px;
  color: var(--text);
}

.app-screenshots {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 20px 0;
}

.screenshot-item {
  flex: 0 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.screenshot-item:hover {
  transform: translateY(-8px);
}

.screenshot-item img {
  width: 140px;
  height: auto;
  display: block;
}

.guide-steps {
  max-width: 800px;
  margin: 0 auto 48px;
}

.guide-step {
  display: flex;
  gap: 24px;
  padding: 30px 0;
  border-bottom: 1px solid var(--border);
}

.step-num {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
}

.step-content h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text);
}

.step-content p {
  color: var(--text-light);
}

.guide-tips {
  background: var(--bg);
  padding: 40px;
  border-radius: var(--radius);
}

.guide-tips h3 {
  font-size: 22px;
  margin-bottom: 24px;
  text-align: center;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.tip-item {
  background: #fff;
  padding: 24px;
  border-radius: var(--radius-sm);
}

.tip-item h4 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--primary);
}

.tip-item p {
  font-size: 15px;
  color: var(--text-light);
}

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

.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-img {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.feature-img img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text);
}

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

.assets-content {
  display: grid;
  grid-template-columns: 500px 1fr;
  gap: 50px;
  align-items: start;
}

.assets-img img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.assets-text p {
  margin-bottom: 20px;
  color: var(--text);
}

.assets-text h3 {
  font-size: 20px;
  margin: 28px 0 12px;
  color: var(--text);
}

.security-grid {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 40px;
  margin-bottom: 48px;
}

.security-banner {
  margin-bottom: 40px;
  border-radius: var(--radius);
  overflow: hidden;
}

.security-banner img {
  width: 100%;
  height: auto;
  display: block;
}

.security-main p {
  margin-bottom: 20px;
  color: var(--text);
}

.security-main h3 {
  font-size: 20px;
  margin: 28px 0 12px;
  color: var(--text);
}

.security-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.security-card {
  background: var(--bg);
  padding: 24px;
  border-radius: var(--radius);
}

.security-card.warn {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border-left: 4px solid #ef4444;
}

.security-card h4 {
  font-size: 17px;
  margin-bottom: 14px;
  color: var(--text);
}

.security-card ul li {
  font-size: 14px;
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-light);
}

.security-card ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary);
}

.security-card.warn ul li::before {
  color: #ef4444;
}

.security-faq {
  margin-bottom: 32px;
}

.security-faq h3 {
  font-size: 22px;
  margin-bottom: 20px;
  text-align: center;
}

.sfaq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sfaq-item {
  background: #fff;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.sfaq-item h4 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--primary);
}

.sfaq-item p {
  font-size: 15px;
  color: var(--text-light);
}

.risk-notice {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  padding: 20px 24px;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}

.risk-notice p {
  font-size: 14px;
  color: #1e40af;
  margin: 0;
}

.verify-methods {
  max-width: 800px;
  margin: 0 auto 40px;
}

.verify-banner {
  margin-bottom: 40px;
  border-radius: var(--radius);
  overflow: hidden;
}

.verify-banner img {
  width: 100%;
  height: auto;
  display: block;
}

.verify-item {
  display: flex;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.verify-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}

.verify-content h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text);
}

.verify-content p {
  color: var(--text-light);
}

.verify-cta {
  text-align: center;
  padding: 40px;
  background: var(--bg);
  border-radius: var(--radius);
}

.verify-cta p {
  margin-bottom: 20px;
  color: var(--text);
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border-radius: var(--radius);
  margin-bottom: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.faq-q {
  font-size: 17px;
  font-weight: 600;
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text);
  transition: background var(--transition);
}

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

.faq-q::after {
  content: '+';
  font-size: 24px;
  color: var(--primary);
  transition: transform var(--transition);
}

.faq-item.active .faq-q::after {
  transform: rotate(45deg);
}

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

.faq-item.active .faq-a {
  padding: 0 24px 20px;
  max-height: 500px;
}

.faq-a p {
  color: var(--text-light);
  line-height: 1.8;
}

.brand-content {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 50px;
  align-items: center;
}

.brand-banner {
  margin-bottom: 40px;
  border-radius: var(--radius);
  overflow: hidden;
}

.brand-banner img {
  width: 100%;
  height: auto;
  display: block;
}

.brand-img img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.brand-text p {
  margin-bottom: 20px;
  color: var(--text);
}

.brand-text h3 {
  font-size: 20px;
  margin: 28px 0 16px;
  color: var(--text);
}

.brand-values li {
  padding: 10px 0;
  padding-left: 24px;
  position: relative;
  color: var(--text);
}

.brand-values li::before {
  content: '★';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 50px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 24px;
}

.contact-item {
  background: var(--bg);
  padding: 24px;
  border-radius: var(--radius);
}

.contact-item h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--text);
}

.contact-item p {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.contact-notice {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  padding: 30px;
  border-radius: var(--radius);
  border-left: 4px solid #f59e0b;
  align-self: start;
}

.contact-notice h3 {
  font-size: 18px;
  margin-bottom: 14px;
  color: #92400e;
}

.contact-notice p {
  font-size: 15px;
  color: #78350f;
  line-height: 1.8;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.news-item {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.news-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.news-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.news-item h3 {
  font-size: 18px;
  padding: 20px 20px 12px;
  color: var(--text);
}

.news-item p {
  font-size: 15px;
  padding: 0 20px 20px;
  color: var(--text-light);
}

.news-more {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 30px;
}

.news-item-large {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.news-item-large img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.news-item-content {
  padding: 20px;
}

.news-item-content h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text);
}

.news-item-content p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

.footer {
  background: var(--bg-dark);
  color: var(--text-white);
  padding: 60px 0 30px;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.footer-brand span {
  font-size: 22px;
  font-weight: 700;
}

.footer-links {
  display: flex;
  gap: 80px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #fff;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-white);
  opacity: 0.7;
  padding: 6px 0;
  transition: opacity var(--transition);
}

.footer-col a:hover {
  opacity: 1;
  color: #fff;
}

.footer-bottom {
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  opacity: 0.6;
  margin-bottom: 8px;
}

.back-top {
  position: fixed;
  bottom: 100px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

.float-chat {
  position: fixed;
  bottom: 36px;
  right: 24px;
  padding: 14px 24px;
  background: linear-gradient(135deg, var(--accent) 0%, #00b894 100%);
  color: #fff;
  border: none;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,212,170,0.4);
  transition: all var(--transition);
  z-index: 999;
}

.float-chat:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(0,212,170,0.5);
}

@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .about-img {
    order: -1;
    text-align: center;
  }
  
  .about-img img {
    max-width: 100%;
    margin: 0 auto;
  }
  
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .assets-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .assets-img {
    text-align: center;
  }
  
  .assets-img img {
    max-width: 500px;
    margin: 0 auto;
  }
  
  .security-grid {
    grid-template-columns: 1fr;
  }
  
  .brand-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .brand-img {
    order: -1;
    text-align: center;
  }
  
  .brand-img img {
    max-width: 300px;
    margin: 0 auto;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .news-more {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  body.menu-open {
    overflow: hidden;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-desc {
    font-size: 16px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .download-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .app-screenshots {
    gap: 12px;
  }
  
  .screenshot-item img {
    width: 100px;
  }
  
  .tips-grid {
    grid-template-columns: 1fr;
  }
  
  .sfaq-grid {
    grid-template-columns: 1fr;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-main {
    flex-direction: column;
    gap: 40px;
  }
  
  .footer-links {
    flex-wrap: wrap;
    gap: 30px;
  }
  
  .back-top {
    bottom: 90px;
    right: 16px;
    width: 44px;
    height: 44px;
  }
  
  .float-chat {
    bottom: 30px;
    right: 16px;
    padding: 12px 20px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 16px 60px;
  }
  
  .hero-title {
    font-size: 24px;
  }
  
  .hero-btns {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .guide-step {
    flex-direction: column;
    gap: 16px;
  }
  
  .guide-tips {
    padding: 24px;
  }
  
  .verify-item {
    flex-direction: column;
    gap: 12px;
  }
  
  .contact-notice {
    padding: 20px;
  }
}