:root {
  --color-primary: #16a085;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-background: #ffffff;
  --color-border: #e5e7eb;

  --font-size-xl: 1.5rem;
  --font-size-lg: 1.25rem;
  --font-size-md: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-xs: 0.75rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  font-size: var(--font-size-md);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.last-updated {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

section {
  margin-bottom: 2rem;
}

h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---- Hero ---- */
.hero {
  background: linear-gradient(160deg, #0e7a63 0%, #16a085 60%, #1abc9c 100%);
  color: var(--color-background);
  padding: 5rem 0 4rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 20px;
  padding: 0.25rem 0.9rem;
  margin-bottom: 1rem;
  color: rgba(255,255,255,0.9);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-background);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-background);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.hero-desc {
  font-size: var(--font-size-md);
  color: rgba(255,255,255,0.85);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.btn-primary {
  display: inline-block;
  background-color: var(--color-background);
  color: var(--color-primary);
  font-size: var(--font-size-md);
  font-weight: 700;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.9;
}

/* ---- Section common ---- */
.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  margin-bottom: 0.5rem;
  border-bottom: none;
  padding-bottom: 0;
}

.section-desc {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

/* ---- Features ---- */
.features {
  padding: 4rem 0;
  background-color: #f9fafb;
}

.features .section-title {
  margin-bottom: 2.5rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.75rem 1.5rem;
}

.feature-num {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  opacity: 0.6;
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: var(--font-size-lg);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---- Extras ---- */
.extras {
  padding: 4rem 0;
}

.extras .section-title {
  margin-bottom: 2.5rem;
}

.extras-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.extra-item {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
}

.extra-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.extra-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---- Apps ---- */
.apps {
  padding: 4rem 0;
  background-color: #f9fafb;
}

.apps .section-title {
  margin-bottom: 0.5rem;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.app-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.app-badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  background-color: rgba(22, 160, 133, 0.1);
  color: var(--color-primary);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.75rem;
  width: fit-content;
}

.app-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: var(--font-size-lg);
}

.app-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  flex-grow: 1;
}

.app-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-background);
  background-color: var(--color-primary);
  text-decoration: none;
  padding: 0.6rem 1.25rem;
  border-radius: 50px;
  text-align: center;
  transition: opacity 0.2s;
}

.app-link:hover {
  opacity: 0.85;
}

/* ---- Footer (landing) ---- */
footer .container {
  padding-top: 2rem;
  padding-bottom: 1.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* ---- Shared page styles ---- */
.page-container {
  padding: 2rem 1.5rem;
}

.page-container h1 {
  color: var(--color-primary);
}

/* App header (old index style, kept for compatibility) */
.app-header {
  margin-bottom: 2rem;
}

.app-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Feature list (old style) */
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.feature-item {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.feature-item h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.feature-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Contact box */
.contact-box {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: #f9fafb;
  margin-bottom: 1rem;
  text-align: center;
}

.contact-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.contact-email {
  margin-bottom: 0;
}

.contact-email a {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.contact-email a:hover {
  text-decoration: underline;
}

/* FAQ */
.faq-item {
  margin-bottom: 1.25rem;
}

.faq-item h3 {
  margin-top: 0;
}

.faq-item p {
  color: var(--color-text-light);
}

/* Page links */
.page-links {
  list-style: none;
  margin-left: 0;
}

.page-links li {
  margin-bottom: 0.75rem;
}

.page-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.page-links a:hover {
  text-decoration: underline;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 20px;
  background: #f8fafc;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.lang-btn {
  padding: 10px 14px;
  min-height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-background);
  color: #475569;
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all 0.15s;
}

.lang-btn:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

.lang-btn.active {
  background: #0f172a;
  color: var(--color-background);
  border-color: #0f172a;
}

/* Responsive */
@media (max-width: 700px) {
  .hero {
    padding: 3.5rem 0 3rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-tagline {
    font-size: var(--font-size-lg);
  }

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

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

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

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .container {
    padding: 0 1rem;
  }

  h1 {
    font-size: 1.25rem;
  }

  h2 {
    font-size: 1.1rem;
  }
}