:root {
  --bg: #ffffff;
  --bg-alt: #f4f8fe;
  --panel: #f8fbff;
  --border: #dbe7f5;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --accent-dark: #1d4ed8;
  --text: #0f172a;
  --muted: #52657d;
  --radius: 14px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(37, 99, 235, 0.10);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}
.nav-logo .dot { color: var(--accent); }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  padding: 96px 0 80px;
  background:
    radial-gradient(600px 300px at 80% 10%, var(--accent-soft) 0%, transparent 70%),
    linear-gradient(180deg, #ffffff 0%, var(--bg-alt) 100%);
  border-bottom: 1px solid var(--border);
}
.hero-kicker {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 20px;
}
.hero h1 .accent { color: var(--accent); }
.hero-sub {
  max-width: 640px;
  color: var(--muted);
  font-size: 1.12rem;
  margin-bottom: 32px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.12s, box-shadow 0.12s, background 0.12s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }
.btn-ghost {
  background: #fff;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-ghost:hover { background: var(--accent-soft); color: var(--accent-dark); }

.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; }
.badge {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

/* ---------- sections ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title {
  font-size: 2rem;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-bottom: 12px;
}
.section-sub { color: var(--muted); margin-bottom: 36px; }

/* ---------- about ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.about-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 14px;
  color: var(--accent);
}
.about-list { list-style: none; }
.about-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.98rem;
}
.about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 2px solid var(--accent);
}
.about-list strong { color: var(--text); }

/* ---------- projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
}
.project-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  color: var(--text);
}
.project-head { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.project-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 0.9rem;
  border-radius: 10px;
}
.project-head h3 { font-size: 1.12rem; letter-spacing: -0.01em; }
.project-tagline {
  color: var(--accent-dark);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.project-blurb {
  color: var(--muted);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 14px;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.tag {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 999px;
}
.project-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}
.project-card:hover .project-link { color: var(--accent-dark); }

/* ---------- contact ---------- */
.contact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 8px;
}
.contact-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.contact-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 8px;
}
.contact-value { font-size: 1.05rem; font-weight: 600; color: var(--text); }
a.contact-value { color: var(--accent); }
a.contact-value:hover { color: var(--accent-dark); }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
  background: var(--bg-alt);
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
  .nav-links { gap: 18px; }
}