/* CSS Reset & Variables */
:root {
  --primary: #1e3a8a;
  --primary-light: #3b82f6;
  --secondary: #10b981;
  --dark: #0f172a;
  --light: #f8fafc;
  --grey: #64748b;
  --border: #e2e8f0;
  --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--light);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

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

/* Button Styles */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 10px rgba(30, 58, 138, 0.2);
}

.btn-primary:hover {
  background-color: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(30, 58, 138, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--light);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

/* Header */
header {
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  gap: 18px;
}

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

.logo-icon {
  color: var(--primary);
  font-size: 32px;
}

.logo-text {
  font-weight: 800;
  font-size: 18px;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  white-space: nowrap;
}

.nav-links a:not(.btn) {
  color: var(--grey);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a:not(.btn):hover {
  color: var(--primary);
}

/* Hero Section */
.hero {
  padding: 80px 0;
  background: radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(16, 185, 129, 0.08) 0%, transparent 50%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 40px;
}

.hero-content h1 {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.2;
  color: var(--dark);
  margin-top: 16px;
  margin-bottom: 24px;
}

.hero-content p {
  font-size: 18px;
  color: var(--grey);
  margin-bottom: 32px;
}

.tag {
  display: inline-block;
  background-color: rgba(30, 58, 138, 0.1);
  color: var(--primary);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 20px;
}

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

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

.badge-card {
  background-color: white;
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  transition: transform 0.3s ease;
}

.badge-card:hover {
  transform: translateY(-4px);
}

.badge-icon {
  font-size: 40px;
  color: var(--secondary);
  margin-bottom: 12px;
}

.badge-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.badge-card p {
  font-size: 14px;
  color: var(--grey);
}

/* Disclaimer Bar */
.disclaimer-bar {
  background-color: #fffbeb;
  border-top: 1px solid #fef3c7;
  border-bottom: 1px solid #fef3c7;
  padding: 16px 0;
}

.warning-text {
  color: #b45309;
  font-size: 13px;
}

/* Features */
.features {
  padding: 80px 0;
  background-color: white;
}

.section-title {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 48px;
  color: var(--primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 30px;
}

.feature-card {
  padding: 30px;
  border-radius: 16px;
  background-color: var(--light);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.feature-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  transform: translateY(-4px);
}

.feature-card span {
  font-size: 48px;
  color: var(--primary-light);
  margin-bottom: 20px;
  display: block;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  color: var(--grey);
}

/* Download / Launch */
.download {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
  color: white;
}

.download h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

.store-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: white;
  color: var(--primary);
  padding: 16px 28px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
}

.store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  background-color: var(--light);
}

.store-btn-disabled {
  background-color: rgba(255, 255, 255, 0.72);
  color: rgba(30, 58, 138, 0.72);
  cursor: default;
  box-shadow: none;
}

.store-btn-disabled:hover {
  transform: none;
  box-shadow: none;
  background-color: rgba(255, 255, 255, 0.72);
}

/* Support */
.support {
  padding: 80px 0;
  background-color: #f8fafc;
}

.support-header {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  max-width: 820px;
  margin: 0 auto 34px auto;
}

.support-header > .material-icons {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: #dbeafe;
  color: var(--primary);
  font-size: 32px;
}

.support-header h2 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 32px;
  font-weight: 800;
}

.support-header p:last-child {
  color: var(--grey);
}

.eyebrow {
  color: var(--secondary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  max-width: 900px;
  margin: 0 auto;
}

.support-card {
  background-color: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.support-card h3 {
  color: var(--dark);
  font-size: 18px;
  margin-bottom: 12px;
}

.support-card p,
.support-card li {
  color: var(--grey);
  font-size: 14px;
}

.support-card ul {
  padding-left: 1.2em;
}

.support-card li + li {
  margin-top: 8px;
}

.primary-contact {
  border-color: #bfdbfe;
  background: #eff6ff;
}

/* Legal (Accordions) */
.legal {
  padding: 80px 0;
}

.accordion-group {
  max-width: 750px;
  margin: 0 auto;
}

details {
  background-color: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

details[open] {
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

summary {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  outline: none;
  user-select: none;
}

.details-content {
  padding: 0 24px 24px 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: #334155;
}

.details-content h4 {
  margin-top: 16px;
  margin-bottom: 6px;
  color: var(--primary);
}

.details-content p {
  margin-bottom: 10px;
}

/* Footer */
footer {
  background-color: var(--dark);
  color: #94a3b8;
  padding: 40px 0;
  border-top: 1px solid #1e293b;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .nav-container {
    height: auto;
    min-height: 70px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .logo-text {
    font-size: 15px;
  }

  .nav-links {
    gap: 10px;
  }

  .nav-links a:not(.btn) {
    display: none;
  }

  .btn-sm {
    padding: 8px 12px;
    font-size: 12px;
  }

  .hero-container {
    grid-template-columns: 1fr;
  }
  
  .hero-content h1 {
    font-size: 32px;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }

  .support-header,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .support-header > .material-icons {
    width: 48px;
    height: 48px;
  }
}