:root {
  --container: 1180px;
  --primary-blue: #0052cc;
  --secondary-blue: #1a73e8;
  --light-blue: #e8f0fe;
  --dark-blue: #0d1b2a;
  --text-dark: #202124;
  --text-gray: #5f6368;
  --border-light: #dadce0;
  --success-green: #34a853;
  --warning-orange: #fbbc04;
  --bg-light: #f8f9fa;
  --white: #ffffff;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  background-color: var(--white);
  line-height: 1.6;
  font-size: 16px;
}

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

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  transition: var(--transition);
}

.container {
  width: min(100% - 24px, var(--container));
  margin-inline: auto;
}

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

.image-box,
.download-media,
.version-media,
.preview-media,
.local-img-frame,
.hero-image-wrapper,
.verify-image,
.version-image,
.steps-image,
.preview-image-frame,
.preview-thumbs,
.security-image,
.function-image {
  overflow: visible;
  line-height: 0;
  padding: 0;
}

.image-box img,
.download-media img,
.version-media img,
.preview-media img,
.local-img-frame img,
.hero-image-wrapper img,
.verify-image img,
.verify-img,
.version-image img,
.version-img,
.steps-image img,
.steps-img,
.preview-image-frame img,
.preview-main-img,
.preview-thumb img,
.preview-thumbs img,
.security-image img,
.function-image img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

/* Progress Bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(to right, var(--primary-blue), var(--secondary-blue));
  width: 0%;
  z-index: 999;
  transition: width 0.1s ease;
}

/* Header & Service Bar */
.service-bar {
  position: sticky;
  top: 0;
  background-color: var(--white);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  padding: 16px 0;
  transition: var(--transition);
}

.service-bar.compact {
  padding: 12px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.service-bar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.service-bar-left {
  flex-shrink: 0;
  min-width: 120px;
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin: 0;
}

.service-bar.compact .brand-text {
  font-size: 16px;
}

.service-bar-middle {
  flex: 1;
  text-align: center;
}

.service-slogan {
  font-size: 14px;
  color: var(--text-gray);
  margin: 0;
}

.service-bar.compact .service-slogan {
  font-size: 12px;
}

.service-bar-nav {
  display: flex;
  gap: 24px;
  flex-shrink: 0;
}

.nav-link {
  font-size: 14px;
  color: var(--text-gray);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

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

.mobile-menu-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  background-color: var(--primary-blue);
  border-radius: 50%;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  z-index: 101;
  box-shadow: 0 4px 12px rgba(0, 82, 204, 0.3);
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background-color: var(--white);
  transition: var(--transition);
}

.mobile-menu {
  position: fixed;
  bottom: 100px;
  right: 24px;
  background-color: var(--white);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 0;
  display: none;
  z-index: 100;
  overflow: hidden;
}

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

.mobile-menu-content {
  padding: 16px 0;
}

.mobile-nav-link {
  display: block;
  padding: 12px 20px;
  color: var(--text-dark);
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.mobile-nav-link:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  border-left-color: var(--primary-blue);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #f5f7fa 0%, #eef2f8 100%);
  padding: 60px 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 60px;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--secondary-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  width: fit-content;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
  margin: 0;
}

.hero-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-gray);
  margin: 0;
}

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

.btn {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background-color: var(--secondary-blue);
  box-shadow: 0 4px 12px rgba(0, 82, 204, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--light-blue);
  border-color: var(--secondary-blue);
  color: var(--secondary-blue);
}

.hero-warning {
  background-color: rgba(251, 188, 4, 0.1);
  border-left: 4px solid var(--warning-orange);
  padding: 16px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-dark);
}

.hero-warning strong {
  color: var(--warning-orange);
}

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-visual-panel {
  background-color: var(--white);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.hero-image-wrapper {
  border-radius: 12px;
  overflow: hidden;
  background-color: var(--bg-light);
  margin-bottom: 16px;
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
}

.service-badges {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.badge {
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  padding: 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.hero-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.info-card {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  transition: var(--transition);
}

.info-card:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 16px rgba(0, 82, 204, 0.1);
  transform: translateY(-4px);
}

.info-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

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

/* Modules */
.module {
  padding: 60px 0;
  border-bottom: 1px solid var(--border-light);
}

.module:last-of-type {
  border-bottom: none;
}

.module > .container > h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-dark);
}

.module > .container > h2:first-child {
  margin-top: 0;
}

.section-intro {
  font-size: 16px;
  color: var(--text-gray);
  margin-bottom: 36px;
  margin-top: 0;
}

/* Download Verify Section */
.verify-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
}

.verify-tabs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.verify-tab {
  text-align: left;
  padding: 12px 16px;
  border-left: 3px solid transparent;
  background-color: var(--bg-light);
  color: var(--text-gray);
  font-weight: 500;
  transition: var(--transition);
}

.verify-tab:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
}

.verify-tab.active {
  background-color: var(--white);
  color: var(--primary-blue);
  border-left-color: var(--primary-blue);
  box-shadow: 0 2px 8px rgba(0, 82, 204, 0.1);
}

.verify-content {
  position: relative;
}

.verify-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.verify-panel.active {
  display: block;
}

.verify-panel h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.verify-why {
  background-color: var(--light-blue);
  padding: 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 14px;
}

.verify-checklist {
  background-color: var(--bg-light);
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.checklist-item {
  margin-bottom: 12px;
}

.checklist-item:last-child {
  margin-bottom: 0;
}

.checklist-item label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-dark);
}

.checklist-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--primary-blue);
}

.verify-note {
  background-color: rgba(52, 168, 83, 0.1);
  border-left: 4px solid var(--success-green);
  padding: 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--text-dark);
}

.verify-image {
  background-color: var(--bg-light);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
}

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

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

.platform-card {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.platform-card:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 8px 24px rgba(0, 82, 204, 0.1);
}

.platform-header {
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.platform-header h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.platform-status {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.platform-body {
  padding: 20px;
}

.platform-body p {
  margin: 0 0 16px 0;
  font-size: 14px;
  color: var(--text-gray);
}

.platform-body h4 {
  font-size: 15px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.platform-body ul {
  list-style: none;
  padding-left: 0;
}

.platform-body li {
  padding-left: 24px;
  margin-bottom: 10px;
  position: relative;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

.platform-body li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-green);
  font-weight: bold;
}

/* Version Center */
.version-verify-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
}

.version-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.version-item {
  text-align: left;
  padding: 16px;
  background-color: var(--bg-light);
  border-left: 3px solid transparent;
  border-radius: 6px;
  color: var(--text-gray);
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 12px;
}

.version-item:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
}

.version-item.active {
  background-color: var(--white);
  color: var(--primary-blue);
  border-left-color: var(--primary-blue);
  box-shadow: 0 2px 8px rgba(0, 82, 204, 0.1);
}

.item-icon {
  font-size: 18px;
}

.item-title {
  font-size: 14px;
}

.version-details {
  position: relative;
}

.version-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.version-panel.active {
  display: block;
}

.version-panel h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-dark);
}

.version-panel p {
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

.version-image {
  background-color: var(--bg-light);
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

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

/* Installation Steps */
.steps-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.step-item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 16px;
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px;
  transition: var(--transition);
}

.step-item:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 16px rgba(0, 82, 204, 0.1);
  background-color: var(--light-blue);
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px 0;
  color: var(--text-dark);
}

.step-content p {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

.step-note {
  font-size: 13px;
  color: var(--secondary-blue);
  font-style: italic;
}

.steps-image {
  background-color: var(--bg-light);
  padding: 40px;
  border-radius: 12px;
  text-align: center;
}

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

/* App Preview */
.preview-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}

.preview-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preview-image-frame {
  background-color: var(--bg-light);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

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

.preview-description h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.preview-description p {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

.preview-thumbs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-thumb {
  aspect-ratio: 1;
  border: 2px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.preview-thumb:hover {
  border-color: var(--primary-blue);
}

.preview-thumb.active {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 2px rgba(0, 82, 204, 0.1);
}

.preview-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-box {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  transition: var(--transition);
}

.feature-box:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 16px rgba(0, 82, 204, 0.1);
}

.feature-box h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.feature-box p {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.6;
}

/* Security Alert */
.security-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.security-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  flex-wrap: wrap;
}

.security-tab {
  padding: 10px 16px;
  background-color: var(--bg-light);
  color: var(--text-gray);
  border-radius: 6px;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
}

.security-tab:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
}

.security-tab.active {
  background-color: var(--primary-blue);
  color: var(--white);
}

.security-content {
  position: relative;
}

.security-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.security-panel.active {
  display: block;
}

.security-panel h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-dark);
}

.risk-box,
.suggest-box,
.alert-box {
  margin-bottom: 20px;
  padding: 20px;
  border-radius: 8px;
}

.risk-box {
  background-color: rgba(251, 188, 4, 0.1);
  border-left: 4px solid var(--warning-orange);
}

.suggest-box {
  background-color: rgba(52, 168, 83, 0.1);
  border-left: 4px solid var(--success-green);
}

.alert-box {
  background-color: rgba(219, 40, 40, 0.1);
  border-left: 4px solid #db2828;
}

.risk-box h4,
.suggest-box h4,
.alert-box h4 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 10px 0;
}

.risk-box p,
.suggest-box p,
.alert-box p {
  margin: 0;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

.suggest-box ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.suggest-box li {
  padding-left: 24px;
  margin-bottom: 8px;
  position: relative;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

.suggest-box li:last-child {
  margin-bottom: 0;
}

.suggest-box li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-green);
  font-weight: bold;
}

.security-image {
  background-color: var(--bg-light);
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

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

/* Function Guide */
.function-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  overflow-x: auto;
  flex-wrap: wrap;
}

.function-tab {
  padding: 10px 16px;
  background-color: var(--bg-light);
  color: var(--text-gray);
  border-radius: 6px;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
}

.function-tab:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
}

.function-tab.active {
  background-color: var(--primary-blue);
  color: var(--white);
}

.function-panels {
  position: relative;
}

.function-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.function-panel.active {
  display: block;
}

.function-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.function-content h3 {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 16px 0;
  color: var(--text-dark);
}

.function-content p {
  margin: 0 0 16px 0;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

.function-image {
  background-color: var(--bg-light);
  padding: 16px;
  border-radius: 8px;
}

.function-image img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

/* Pre-Use Checklist */
.checklist-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.checklist-card {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  transition: var(--transition);
}

.checklist-card:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(0, 82, 204, 0.1);
}

.checklist-header {
  padding: 20px;
  background-color: var(--light-blue);
  display: flex;
  align-items: center;
  gap: 12px;
}

.checklist-input {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary-blue);
  flex-shrink: 0;
}

.checklist-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin: 0;
  font-weight: 600;
  color: var(--text-dark);
  font-size: 15px;
}

.check-icon {
  display: inline-flex;
  width: 24px;
  height: 24px;
  background-color: var(--success-green);
  color: var(--white);
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: bold;
  margin-left: -4px;
  opacity: 0;
  transition: var(--transition);
}

.checklist-input:checked ~ .check-icon {
  opacity: 1;
}

.checklist-body {
  padding: 20px;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

.completion-message {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--success-green), #0d9488);
  color: var(--white);
}

.completion-message .checklist-header {
  background-color: transparent;
  padding: 0;
}

.completion-content {
  padding: 32px;
  text-align: center;
}

.completion-content h3 {
  margin: 0 0 12px 0;
  font-size: 20px;
  font-weight: 700;
}

.completion-content p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

.checklist-footer {
  text-align: center;
  padding: 20px;
  background-color: var(--bg-light);
  border-radius: 8px;
}

.checklist-footer p {
  margin: 0;
  font-size: 14px;
  color: var(--text-gray);
}

/* FAQ Section */
.faq-categories {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.faq-category {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.category-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--primary-blue);
}

.faq-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(0, 82, 204, 0.1);
}

.faq-question {
  width: 100%;
  padding: 16px 20px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--light-blue);
  color: var(--text-dark);
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.faq-item.active .faq-question {
  background-color: var(--primary-blue);
  color: var(--white);
}

.faq-question:hover {
  background-color: #d6e8f9;
}

.faq-item.active .faq-question:hover {
  background-color: var(--secondary-blue);
}

.faq-icon {
  display: inline-flex;
  width: 24px;
  height: 24px;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  transition: var(--transition);
}

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

.faq-answer {
  display: none;
  padding: 20px;
  border-top: 1px solid var(--border-light);
  background-color: var(--white);
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  display: block;
  animation: slideDown 0.3s ease;
}

.faq-answer p {
  margin: 0 0 12px 0;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Footer */
.footer {
  background-color: var(--dark-blue);
  color: #b8c5d6;
  padding: 50px 0 25px;
  margin-top: 60px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer-section h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 16px 0;
}

.footer-section p {
  font-size: 13px;
  line-height: 1.8;
  margin: 0;
  color: #b8c5d6;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  color: #b8c5d6;
  font-size: 13px;
  transition: var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: #b8c5d6;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 50px;
  height: 50px;
  background-color: var(--primary-blue);
  color: var(--white);
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  z-index: 99;
  box-shadow: 0 4px 12px rgba(0, 82, 204, 0.3);
  transition: var(--transition);
}

.back-to-top:hover {
  background-color: var(--secondary-blue);
  transform: translateY(-2px);
}

.back-to-top.show {
  display: flex;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
  }
  to {
    opacity: 1;
    max-height: 1000px;
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  :root {
    --container: 100%;
  }

  .container {
    padding: 0 16px;
  }

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

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

  .verify-layout {
    grid-template-columns: 1fr;
  }

  .verify-tabs {
    flex-direction: row;
    overflow-x: auto;
    gap: 4px;
  }

  .verify-tab {
    flex-shrink: 0;
  }

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

  .version-verify-layout {
    grid-template-columns: 1fr;
  }

  .version-item {
    flex: 1;
  }

  .steps-container {
    grid-template-columns: 1fr;
  }

  .preview-container {
    grid-template-columns: 1fr;
  }

  .preview-thumbs {
    flex-direction: row;
    gap: 12px;
  }

  .preview-thumb {
    flex: 1;
  }

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

  .function-content {
    grid-template-columns: 1fr;
  }

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

  .faq-categories {
    grid-template-columns: 1fr;
  }

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

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

  .service-bar-nav {
    gap: 16px;
  }

  .nav-link {
    font-size: 13px;
  }
}

@media (max-width: 768px) {
  .service-bar-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .service-bar-middle {
    order: -1;
  }

  .service-bar-nav {
    width: 100%;
    gap: 12px;
    justify-content: center;
  }

  .nav-link {
    padding: 6px 0;
  }

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

  .hero-label {
    font-size: 11px;
  }

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

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

  .btn {
    width: 100%;
    text-align: center;
  }

  .hero-info-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .module {
    padding: 48px 0;
  }

  .module > .container > h2 {
    font-size: 28px;
  }

  .section-intro {
    margin-bottom: 28px;
  }

  .verify-tabs {
    flex-direction: row;
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  .verify-tab {
    flex-shrink: 0;
    padding: 10px 14px;
    font-size: 13px;
  }

  .steps-image {
    padding: 20px;
  }

  .preview-features {
    grid-template-columns: 1fr;
  }

  .security-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  .security-tab {
    flex-shrink: 0;
    font-size: 13px;
    padding: 8px 14px;
  }

  .function-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  .function-tab {
    flex-shrink: 0;
    font-size: 13px;
    padding: 8px 14px;
  }

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

  .faq-categories {
    gap: 28px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .back-to-top {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .service-bar {
    padding: 12px 0;
  }

  .service-bar-nav {
    flex-direction: column;
    gap: 8px;
  }

  .nav-link {
    font-size: 12px;
    padding: 4px 0;
  }

  .hero-title {
    font-size: 24px;
    line-height: 1.3;
  }

  .hero-text {
    font-size: 14px;
  }

  .hero-warning {
    font-size: 12px;
    padding: 12px;
  }

  .module > .container > h2 {
    font-size: 24px;
  }

  .section-intro {
    font-size: 14px;
    margin-bottom: 24px;
  }

  .verify-panel h3 {
    font-size: 20px;
  }

  .platform-header h3 {
    font-size: 18px;
  }

  .platform-body h4 {
    font-size: 14px;
  }

  .platform-body li {
    font-size: 13px;
  }

  .version-panel h3 {
    font-size: 20px;
  }

  .step-number {
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .step-item {
    padding: 16px;
    gap: 12px;
  }

  .step-content h3 {
    font-size: 15px;
  }

  .step-content p {
    font-size: 13px;
  }

  .security-panel h3 {
    font-size: 20px;
  }

  .risk-box,
  .suggest-box,
  .alert-box {
    padding: 16px;
    margin-bottom: 16px;
  }

  .function-content h3 {
    font-size: 20px;
  }

  .function-content p {
    font-size: 13px;
  }

  .completion-content {
    padding: 24px;
  }

  .completion-content h3 {
    font-size: 18px;
  }

  .completion-content p {
    font-size: 13px;
  }

  .category-title {
    font-size: 18px;
  }

  .faq-question {
    font-size: 13px;
    padding: 14px 16px;
  }

  .faq-answer {
    padding: 16px;
    font-size: 13px;
  }

  .footer-section h4 {
    font-size: 15px;
  }

  .footer-section p,
  .footer-section a {
    font-size: 12px;
  }
}