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

:root {
  --bg: #fafafa;
  --text: #222;
  --card-bg: #fff;
  --border: #e5e5e5;
  --card-hover: #f5f5f5;
}

[data-theme="light"] {
  --bg: #fafafa;
  --text: #222;
  --card-bg: #fff;
  --border: #e5e5e5;
  --card-hover: #f5f5f5;
}

[data-theme="dark"] {
  --bg: #111;
  --text: #eee;
  --card-bg: #1a1a1a;
  --border: #333;
  --card-hover: #252525;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.2s, color 0.2s;
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--card-hover);
}

.theme-toggle svg {
  display: none;
  color: var(--text);
}

[data-theme="dark"] .theme-toggle svg {
  color: #fff;
}

.theme-toggle .icon-system { display: block; }

[data-theme-mode="light"] .theme-toggle .icon-light { display: block; }
[data-theme-mode="light"] .theme-toggle .icon-system { display: none; }

[data-theme-mode="dark"] .theme-toggle .icon-dark { display: block; }
[data-theme-mode="dark"] .theme-toggle .icon-system { display: none; }

main {
  flex: 1;
  max-width: 600px;
  margin: 0 auto;
  padding: 5rem 1.5rem 2rem;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 3rem;
}

.hero .prefix {
  color: #ff6b6b;
  font-size: 2rem;
  font-weight: 600;
}

.hero .domain {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

[data-theme="dark"] .hero .prefix {
  color: #ff8a8a;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.125rem;
  color: #666;
}

[data-theme="dark"] .tagline {
  color: #999;
}

.apps {
  display: grid;
  gap: 1rem;
}

.app-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.app-card:hover {
  background: var(--card-hover);
  transform: translateY(-2px);
}

.app-card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.app-card h2 .sub {
  font-size: 0.75rem;
  font-weight: 400;
  color: #999;
}

[data-theme="dark"] .app-card h2 .sub {
  color: #bbb;
}

.app-card p {
  font-size: 0.9rem;
  color: #666;
}

[data-theme="dark"] .app-card p {
  color: #999;
}

footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: #666;
  font-size: 0.85rem;
}

[data-theme="dark"] footer {
  color: #777;
}