:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-primary: #2D6A4F;
  --color-primary-light: #eaf5f0;
  --color-text: #1a1a2e;
  --color-text-secondary: #555;
  --color-border: #e0e0e0;
  --color-header-bg: #1a1a2e;
  --color-header-text: #ffffff;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-width: 780px;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

/* Header */
.site-header {
  background: var(--color-header-bg);
  padding: 1rem 2rem;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  color: var(--color-header-text);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 1.5rem;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: #ffffff;
}

/* Main content */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 2rem 0 3rem;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.3rem;
}

.hero .tagline {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.hero .intro {
  margin-top: 1.5rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* Section headers */
.section-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 1.2rem;
  font-weight: 600;
}

/* App cards */
.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

@media (max-width: 600px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
}

.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.app-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.app-card .app-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.app-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.app-card .app-platforms {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 0.6rem;
}

.app-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.app-card .app-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.app-card .app-links a {
  font-size: 0.85rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

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

/* About section */
.about {
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
  margin-top: 1rem;
}

.about p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
}

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

.about a:hover {
  text-decoration: underline;
}

/* Page layout (for subpages) */
.page-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.page-body h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

.page-body h1 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
}

.page-body p {
  margin-bottom: 1rem;
}

.page-body ul, .page-body ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.page-body li {
  margin-bottom: 0.4rem;
}

.page-body strong {
  font-weight: 600;
}

.page-body a {
  color: var(--color-primary);
  text-decoration: none;
}

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

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
}