:root {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1f232c;
  --text: #e7e9ee;
  --muted: #9aa3b2;
  --accent: #4f8cff;
  --border: #262b36;
  --radius: 14px;
  --max: 920px;
}
[data-theme="light"] {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #eef1f6;
  --text: #1a1d23;
  --muted: #5b6472;
  --accent: #2f6bff;
  --border: #e3e7ee;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 1.5rem;
  padding: 0.9rem clamp(1rem, 5vw, 2rem);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); text-decoration: none; }
.nav nav { margin-left: auto; display: flex; gap: 1.25rem; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.nav nav a:hover { color: var(--text); }
#theme-toggle {
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 1rem;
}

main { max-width: var(--max); margin: 0 auto; padding: 0 clamp(1rem, 5vw, 2rem); }
section { padding: 3.5rem 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
h2 { font-size: 1.5rem; margin-bottom: 1.25rem; }
h3 { font-size: 1.05rem; margin-bottom: 0.6rem; }
p { color: var(--text); }

/* Hero */
.hero { padding: clamp(3rem, 10vw, 6rem) 0 3.5rem; border-bottom: 1px solid var(--border); }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 0.9rem; letter-spacing: 0.02em; }
.hero h1 { font-size: clamp(2rem, 6vw, 3.2rem); line-height: 1.15; margin: 0.6rem 0 1rem; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 620px; }
.cta { display: flex; gap: 0.75rem; margin-top: 1.75rem; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 0.7rem 1.3rem; border-radius: 10px;
  text-decoration: none; font-weight: 600; font-size: 0.95rem; transition: transform 0.08s ease;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: #fff; }
.btn.ghost { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.skill-card ul { list-style: none; }
.skill-card li { color: var(--muted); padding: 0.2rem 0; }

/* Projects */
.project-grid { display: grid; gap: 1.75rem; }
.project-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 1.5rem; align-items: center;
  transition: border-color 0.15s ease;
}
.project-card:hover { border-color: var(--accent); }
.project-info { display: flex; flex-direction: column; gap: 0.7rem; }
.project-card h3 { margin: 0; font-size: 1.25rem; }
.project-card p { color: var(--muted); font-size: 0.95rem; }

/* live preview "browser" frame */
.preview {
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
  background: #fff; box-shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
}
.browser-bar {
  display: flex; gap: 7px; align-items: center;
  padding: 9px 12px; background: var(--surface-2); border-bottom: 1px solid var(--border);
}
.browser-bar span { width: 11px; height: 11px; border-radius: 50%; }
.browser-bar span:nth-child(1) { background: #ff5f57; }
.browser-bar span:nth-child(2) { background: #febc2e; }
.browser-bar span:nth-child(3) { background: #28c840; }
.preview iframe { width: 100%; height: 320px; border: 0; display: block; background: #fff; }

@media (max-width: 720px) {
  .project-card { grid-template-columns: 1fr; }
  .preview { order: -1; }
}
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag { font-size: 0.72rem; background: var(--surface-2); color: var(--muted); padding: 0.2rem 0.55rem; border-radius: 999px; }
.project-links { display: flex; gap: 1rem; margin-top: 0.4rem; }
.project-links a { color: var(--accent); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
.project-links a:hover { text-decoration: underline; }

/* Background (education, certificates, strengths, languages) */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.info-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.info-card ul { list-style: none; }
.info-card li { color: var(--muted); padding: 0.2rem 0; }
.info-card .role { font-weight: 600; color: var(--text); }
.info-card .sub { color: var(--muted); font-size: 0.92rem; }
@media (max-width: 640px) { .two-col { grid-template-columns: 1fr; } }

/* Contact */
.contact-list { list-style: none; margin-top: 1rem; display: grid; gap: 0.5rem; }
.contact-list a { color: var(--accent); text-decoration: none; }
.contact-list a:hover { text-decoration: underline; }

footer { text-align: center; padding: 2rem 1rem; color: var(--muted); font-size: 0.85rem; }