:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --text: #1a1d23;
  --text-muted: #565d6b;
  --border: #e3e5e9;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --card-bg: #ffffff;
  --tag-bg: #eef1f6;
  --tag-text: #37404f;
  --shadow: 0 1px 3px rgba(20, 22, 30, 0.06), 0 1px 2px rgba(20, 22, 30, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a;
    --bg-alt: #1b1e24;
    --text: #eef0f3;
    --text-muted: #a3aab5;
    --border: #2b2f37;
    --accent: #5b8dff;
    --accent-text: #0b1220;
    --card-bg: #1b1e24;
    --tag-bg: #262a32;
    --tag-text: #c7cdd6;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --bg: #14161a;
  --bg-alt: #1b1e24;
  --text: #eef0f3;
  --text-muted: #a3aab5;
  --border: #2b2f37;
  --accent: #5b8dff;
  --accent-text: #0b1220;
  --card-bg: #1b1e24;
  --tag-bg: #262a32;
  --tag-text: #c7cdd6;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { font-weight: 700; font-size: 1.05rem; }
.nav { display: flex; gap: 24px; }
.nav a { color: var(--text); font-weight: 500; }
.nav a:hover { color: var(--accent); text-decoration: none; }
.theme-toggle {
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text);
}

/* Hero */
.hero { padding: 72px 0 48px; }
.hero h1 { font-size: 2.4rem; margin: 0 0 12px; }
.tagline {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 0 28px;
}
.hero-links { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.btn-primary:hover { opacity: 0.92; }

/* Skills */
.skills { padding: 32px 0; background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.badge-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 16px 0 0;
}
.badge-list li {
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
}

/* Projects */
.projects { padding: 56px 0; }
.projects h2 { margin-bottom: 24px; }
.secondary-title { margin-top: 48px; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.project-grid-compact { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-featured { grid-column: span 2; }
.card-body { padding: 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.card h3 { margin: 0; font-size: 1.2rem; }
.card p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }

.card-media {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
}
.card-media img { width: 100%; display: block; object-fit: cover; }

.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.tech-tags span {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}

.card-links { font-weight: 600; font-size: 0.9rem; }
.link-disabled { color: var(--text-muted); font-weight: 500; }

.card-compact { padding: 18px; gap: 8px; }
.card-compact h3 { font-size: 1.05rem; }
.card-compact p { font-size: 0.9rem; }

/* Contact */
.contact { padding: 56px 0 72px; background: var(--bg-alt); border-top: 1px solid var(--border); }
.contact p { color: var(--text-muted); margin: 8px 0 24px; }

/* Footer */
.site-footer { padding: 24px 0; border-top: 1px solid var(--border); }
.site-footer p { color: var(--text-muted); font-size: 0.85rem; margin: 0; }

/* Responsive */
@media (max-width: 760px) {
  .project-grid { grid-template-columns: 1fr; }
  .project-grid-compact { grid-template-columns: 1fr; }
  .card-featured { grid-column: span 1; }
  .card-media { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.9rem; }
  .nav { display: none; }
}