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

:root {
  --primary-blue: #1e40af;
  --dark-blue: #1e3a8a;
  --light-blue: #dbeafe;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --success-green: #10b981;
  --warning-orange: #f59e0b;
  --container: 1180px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--white);
  overflow-x: hidden;
}

/* ===== Images Base =====*/
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.image-box,
.passport-media,
.checkpoint-media,
.preview-media {
  overflow: visible;
  line-height: 0;
  padding: 0;
}

.image-box img,
.passport-media img,
.checkpoint-media img,
.preview-media img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

/* ===== Container =====*/
.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

/* ===== Progress Line =====*/
.progress-line {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-blue), var(--success-green));
  width: 0%;
  z-index: 999;
  transition: width 0.1s linear;
}

/* ===== Header / Passport Top Bar =====*/
.passport-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  z-index: 998;
  transition: var(--transition);
}

.passport-header.compact {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 0.5rem 0;
}

.header-container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  gap: 2rem;
}

.header-left {
  flex: 1;
  display: flex;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-blue);
  white-space: nowrap;
}

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

.passport-label {
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: var(--gray-500);
  text-transform: uppercase;
}

.header-right {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

.header-btn {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  background: var(--white);
  color: var(--gray-900);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
}

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

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

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--gray-900);
  transition: var(--transition);
}

/* ===== Mobile Drawer =====*/
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--white);
  border-left: 1px solid var(--gray-200);
  z-index: 997;
  overflow-y: auto;
  transition: right 0.3s ease;
}

.mobile-drawer.active {
  right: 0;
}

.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.drawer-header h2 {
  font-size: 1.125rem;
  color: var(--primary-blue);
}

.drawer-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-500);
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
}

.drawer-link {
  padding: 1rem 1.5rem;
  text-decoration: none;
  color: var(--gray-900);
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.drawer-link:hover {
  background: var(--gray-50);
  border-left-color: var(--primary-blue);
  color: var(--primary-blue);
}

/* ===== Hero Section =====*/
.hero {
  margin-top: 80px;
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--white) 0%, var(--light-blue) 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 3rem;
}

.hero-label {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gray-500);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.hero-desc {
  font-size: 1rem;
  color: var(--gray-700);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background: var(--dark-blue);
}

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

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

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.hero-warning {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  background: rgba(245, 158, 11, 0.1);
  border-left: 3px solid var(--warning-orange);
  border-radius: 2px;
  font-size: 0.9rem;
  color: var(--gray-900);
}

.warning-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.passport-cover {
  position: relative;
  background: var(--primary-blue);
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
}

.cover-image-box {
  width: 100%;
  height: 100%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
  padding: 0;
}

.cover-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.passport-stamps {
  position: absolute;
  top: 1rem;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  pointer-events: none;
}

.stamp {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border: 2px solid var(--primary-blue);
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--primary-blue);
  transform: rotate(-15deg);
  opacity: 0.85;
}

.hero-info-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.info-block {
  padding: 2rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  transition: var(--transition);
}

.info-block:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.block-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.info-block h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--gray-900);
}

.info-block p {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ===== Section Styles =====*/
section {
  padding: 4rem 0;
  opacity: 1;
  transform: translateY(0);
}

h2 {
  font-size: 2rem;
  color: var(--gray-900);
  margin-bottom: 3rem;
  text-align: center;
}

/* ===== Wallet Identity Section =====*/
.wallet-identity {
  background: var(--white);
}

.identity-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.identity-info {
  flex: 1;
}

.identity-item {
  margin-bottom: 2rem;
}

.identity-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.5rem;
}

.identity-value {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-blue);
}

.identity-stamps {
  display: flex;
  gap: 1rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.identity-stamp {
  padding: 0.75rem 1.5rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  font-size: 0.9rem;
}

.identity-stamp:hover,
.identity-stamp.active {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}

.identity-desc {
  padding: 1.5rem;
  background: var(--gray-50);
  border-left: 3px solid var(--primary-blue);
  border-radius: 2px;
  margin-top: 1.5rem;
}

.identity-desc p {
  color: var(--gray-700);
  line-height: 1.8;
}

.identity-image {
  flex: 1;
}

/* ===== Asset Passage Section =====*/
.asset-passage {
  background: var(--gray-50);
}

.passage-stamps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.passage-stamp {
  padding: 2rem 1.5rem;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.passage-stamp:hover,
.passage-stamp.active {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.stamp-circle {
  width: 48px;
  height: 48px;
  background: var(--light-blue);
  color: var(--primary-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.5rem;
}

.stamp-label {
  font-weight: 600;
  color: var(--gray-900);
}

.passage-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  background: var(--white);
  padding: 2rem;
  border-radius: 8px;
}

.passage-text h3 {
  font-size: 1.25rem;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.passage-text p {
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.passage-tips {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: 4px;
}

.tip-label {
  font-weight: 600;
  color: var(--primary-blue);
  font-size: 0.9rem;
}

.tip-text {
  color: var(--gray-700);
  font-size: 0.95rem;
}

/* ===== Feature Visa Section =====*/
.feature-visa {
  background: var(--white);
}

.visa-pages {
  display: grid;
  gap: 1.5rem;
}

.visa-page {
  padding: 2rem;
  background: var(--gray-50);
  border-radius: 8px;
  border-left: 4px solid var(--gray-200);
  cursor: pointer;
  transition: var(--transition);
  display: none;
}

.visa-page.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  background: var(--white);
  border-left-color: var(--primary-blue);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.visa-page h3 {
  font-size: 1.25rem;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.visa-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.visa-content p {
  color: var(--gray-700);
  line-height: 1.8;
}

.visa-info,
.visa-warning {
  padding: 1rem;
  border-radius: 4px;
  font-size: 0.95rem;
}

.visa-info {
  background: rgba(16, 185, 129, 0.1);
  color: var(--gray-900);
  border-left: 3px solid var(--success-green);
}

.visa-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--gray-900);
  border-left: 3px solid var(--warning-orange);
}

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

/* ===== Security Checkpoint Section =====*/
.security-checkpoint {
  background: var(--gray-50);
}

.checkpoint-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.checkpoint-windows {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.checkpoint-window {
  padding: 1.5rem 1rem;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

.checkpoint-window:hover,
.checkpoint-window.active {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.window-num {
  width: 32px;
  height: 32px;
  background: var(--light-blue);
  color: var(--primary-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.window-label {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 0.9rem;
}

.checkpoint-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.checkpoint-desc h3 {
  font-size: 1.25rem;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.checkpoint-risk,
.checkpoint-reason,
.checkpoint-action {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--white);
  border-radius: 4px;
}

.risk-level {
  display: inline-block;
  font-weight: 700;
  color: var(--warning-orange);
  margin-bottom: 0.5rem;
}

.checkpoint-risk p,
.checkpoint-reason p {
  color: var(--gray-700);
  line-height: 1.8;
}

.reason-label,
.action-label {
  display: block;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 0.5rem;
}

.checkpoint-action ul {
  list-style: none;
  margin-left: 0;
}

.checkpoint-action li {
  color: var(--gray-700);
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
}

.checkpoint-action li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-green);
  font-weight: 700;
}

/* ===== Network Routes Section =====*/
.network-routes {
  background: var(--white);
}

.routes-gates {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
  align-items: center;
}

.gate {
  padding: 2rem;
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  transition: var(--transition);
}

.gate:hover {
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.gate h3 {
  font-size: 1.1rem;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

.gate p {
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.gate-check {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--warning-orange);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 2px;
  text-transform: uppercase;
}

.gate-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-blue);
  font-weight: 700;
}

.routes-image {
  margin-top: 2rem;
  background: var(--gray-50);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
}

/* ===== App Preview Section =====*/
.app-preview {
  background: var(--gray-50);
}

.app-showcase {
  display: grid;
  grid-template-columns: 150px 1fr 300px;
  gap: 2rem;
  background: var(--white);
  padding: 2rem;
  border-radius: 8px;
  align-items: start;
}

.app-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-nav-item {
  padding: 1rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.app-nav-item:hover,
.app-nav-item.active {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}

.nav-num {
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.nav-label {
  font-size: 0.85rem;
  font-weight: 600;
}

.app-display {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 500px;
  background: var(--gray-50);
  border-radius: 4px;
  line-height: 0;
  padding: 0;
}

.app-screenshot {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  max-height: 500px;
  cursor: pointer;
}

.app-desc {
  padding: 1.5rem;
  background: var(--gray-50);
  border-radius: 4px;
}

.app-desc h3 {
  font-size: 1.1rem;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

.app-desc p {
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* ===== Scenario Entry Section =====*/
.scenario-entry {
  background: var(--white);
}

.scenario-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.scenario-card {
  padding: 2rem 1.5rem;
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.scenario-card:hover,
.scenario-card.active {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.scenario-icon {
  font-size: 2rem;
}

.scenario-name {
  font-weight: 600;
}

.scenario-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  background: var(--gray-50);
  padding: 2rem;
  border-radius: 8px;
}

.scenario-info h3 {
  font-size: 1.25rem;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.scenario-tips {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--white);
  border-radius: 4px;
}

.tip-title {
  display: block;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 0.75rem;
}

.scenario-tips ul {
  list-style: none;
  margin-left: 0;
}

.scenario-tips li {
  color: var(--gray-700);
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.scenario-tips li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary-blue);
}

/* ===== Stamp Confirmation Section =====*/
.stamp-confirm {
  background: var(--gray-50);
}

.confirm-stamps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.confirm-stamp {
  padding: 2rem 1.5rem;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.confirm-stamp:hover {
  border-color: var(--primary-blue);
}

.confirm-stamp.stamped {
  background: var(--light-blue);
  border-color: var(--primary-blue);
}

.confirm-circle {
  width: 48px;
  height: 48px;
  background: var(--gray-100);
  color: var(--gray-400);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.5rem;
  transition: var(--transition);
}

.confirm-stamp.stamped .confirm-circle {
  background: var(--success-green);
  color: var(--white);
}

.confirm-label {
  font-weight: 600;
  color: var(--gray-900);
}

.confirm-message {
  text-align: center;
  padding: 2rem;
  background: var(--white);
  border-radius: 8px;
  font-size: 1.1rem;
  color: var(--gray-900);
}

.confirm-message.completed {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success-green);
  color: var(--success-green);
  font-weight: 600;
}

/* ===== FAQ Section =====*/
.faq-section {
  background: var(--white);
}

.faq-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.faq-category {
  padding: 0.75rem 1.25rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  font-size: 0.95rem;
}

.faq-category:hover,
.faq-category.active {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}

.faq-items {
  background: var(--gray-50);
  border-radius: 8px;
  overflow: hidden;
}

.faq-category-group {
  display: none;
}

.faq-category-group.active {
  display: block;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  width: 100%;
  padding: 1.5rem;
  background: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-900);
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--gray-50);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--primary-blue);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.5rem 1.5rem;
  background: var(--white);
  color: var(--gray-700);
  line-height: 1.8;
}

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

/* ===== Footer =====*/
.footer {
  background: var(--primary-blue);
  color: var(--white);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.footer-logo h3 {
  font-size: 1.25rem;
  margin-top: 0.5rem;
}

.footer-logo p {
  font-size: 0.9rem;
  opacity: 0.9;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.footer-column h4 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 0.5rem;
}

.footer-column a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-column a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-warning h4 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.footer-warning p {
  font-size: 0.85rem;
  line-height: 1.6;
  opacity: 0.9;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 2rem;
  text-align: center;
}

.disclaimer,
.copyright {
  font-size: 0.85rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

/* ===== Back to Top Button =====*/
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.25rem;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 995;
  transition: var(--transition);
}

.back-to-top:hover {
  background: var(--dark-blue);
}

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

/* ===== Preview Modal =====*/
.preview-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.preview-modal.active {
  display: flex;
}

.preview-container {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  background: var(--white);
  border-radius: 8px;
  overflow: auto;
}

#previewImage {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  display: block;
}

.preview-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  background: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  transition: var(--transition);
}

.preview-close:hover {
  background: var(--dark-blue);
}

/* ===== Animations =====*/
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 1;
}

/* ===== Mobile Responsive =====*/
@media (max-width: 768px) {
  .header-container {
    padding: 0.75rem 0;
    gap: 1rem;
  }

  .header-middle {
    display: none;
  }

  .header-right {
    display: none;
  }

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

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
  }

  .hero {
    padding: 2rem 0;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-info-blocks {
    grid-template-columns: 1fr;
  }

  .identity-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .visa-page.active {
    grid-template-columns: 1fr;
  }

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

  .checkpoint-detail {
    grid-template-columns: 1fr;
  }

  .scenario-detail {
    grid-template-columns: 1fr;
  }

  .routes-gates {
    grid-template-columns: 1fr;
  }

  .gate-arrow {
    transform: rotate(90deg);
    margin: -1rem 0;
  }

  .app-showcase {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .app-nav {
    flex-direction: row;
    grid-template-columns: repeat(4, 1fr);
  }

  .app-display {
    min-height: 300px;
  }

  .app-screenshot {
    max-height: 300px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: 1.5rem;
    right: 1.5rem;
  }

  section {
    padding: 2.5rem 0;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 16px, var(--container));
  }

  .header-container {
    padding: 0.5rem 0;
  }

  h1 {
    font-size: 1.5rem;
    line-height: 1.3;
  }

  h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .hero {
    padding: 1.5rem 0;
    margin-top: 60px;
  }

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

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

  .passage-stamps {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .checkpoint-windows {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .confirm-stamps {
    grid-template-columns: 1fr;
  }

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

  .faq-question {
    padding: 1rem;
    font-size: 0.9rem;
  }

  .faq-answer {
    padding: 0 1rem 1rem 1rem;
    font-size: 0.9rem;
  }

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

  section {
    padding: 1.5rem 0;
  }

  .hero-warning {
    font-size: 0.8rem;
  }
}