:root {
  --bg: #ffffff;
  --text: #000000;
  --muted: #666666;
  --accent: #0a84ff;
  --card: #f9f9f9;
  --radius: 10px;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: Inter, Segoe UI, system-ui, -apple-system, Roboto,
    "Helvetica Neue", Arial;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.45;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 0px 0px 0px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 0;
}
.brand {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.hero {
  text-align: center;
  padding: 12px 0;
}
.hero h1 {
  margin: 0;
  font-size: clamp(28px, 6vw, 44px);
}
.tagline {
  color: var(--muted);
  margin-top: 10px;
}
.actions {
  margin-top: 18px;
}

.card {
  background: transparent;
  border-radius: var(--radius);
  padding: 0 0 20px 0;
  margin: 8px 0 8px 0;
}

.card h2 {
  margin: 0 0 12px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.project {
  padding: 12px;
  border-radius: 8px;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.03));
}
.project h3 {
  margin: 0 0 6px;
}

.interesting-item {
  margin-bottom: 12px;
}
.interesting-item textarea {
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 4px;
  font-size: 14px;
  margin-top: 4px;
}

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border: none;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(0, 0, 0, 0.06);
}
.link {
  color: var(--accent);
  text-decoration: none;
}

.muted {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  padding: 30px 20px;
  text-align: center;
  color: var(--muted);
}

button#theme-toggle {
  background: transparent;
  border: none;
  font-size: 18px;
  cursor: pointer;
}

@media (max-width: 520px) {
  .container {
    margin: 0 auto;
    padding: 15px 10px 10px 10px;
    min-height: auto;
    height: auto;
    justify-content: normal;
  }
  .site-header {
    padding: 12px 16px;
  }
  .hero {
    padding: 16px 0;
  }
  .hero h1 {
    font-size: clamp(24px, 5vw, 32px);
  }
  .tagline {
    margin-top: 6px;
    font-size: 0.9rem;
  }
  .card {
    margin: 6px 0;
    padding: 0 0 12px 0;
  }
  .card h2 {
    font-size: 1.3rem;
    margin: 0 0 8px 0;
  }
  .grid {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-top: 8px;
  }
  .tile-link {
    padding: 10px;
  }
  .tile-link h3 {
    font-size: 1rem;
    margin: 0 0 4px 0;
  }
  .tile-link p {
    font-size: 0.9rem;
  }
  .contact-link {
    padding: 10px 12px;
    font-size: 0.95rem;
  }
  .contact-link span {
    font-size: 14px;
  }
  .icon {
    width: 20px;
    height: 20px;
  }
}
.icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.title-with-icon {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.title-with-icon h3 {
  margin: 0;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card);
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: all 0.2s ease;
}

.contact-link:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.contact-link span {
  font-size: 16px;
}
.tile-link {
  display: block;
  padding: 12px;
  border-radius: 8px;
  background: var(--card);
  border: 1px solid #e0e0e0;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s ease;
}

.tile-link:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
}

.tile-link h3 {
  margin: 0 0 6px;
}

.tile-link p {
  margin: 0;
}