/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-accent: #2a2a2a;
  --color-border: #e0e0e0;
  --color-card-bg: #fff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --nav-height: 64px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ── Header / Nav ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-title a:hover {
  opacity: 0.7;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
}

/* ── Main Content ── */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* ── Portfolio Page ── */
.section-heading {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-card-bg);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.project-card .card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.project-card .card-body {
  padding: 16px;
}

.project-card .card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.3;
}

.project-card .card-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── About Page ── */
.about-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  align-items: start;
}

.about-portrait {
  width: 100%;
  border-radius: 8px;
}

.about-name {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.about-bio {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.about-skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-skills li {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
}

.about-link {
  display: inline-block;
  margin-top: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text);
  padding-bottom: 1px;
  transition: opacity 0.2s;
}

.about-link:hover {
  opacity: 0.6;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-portrait {
    max-width: 240px;
  }

  .main {
    padding: 32px 16px 60px;
  }
}

@media (max-width: 480px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}