:root {
  --bg: #0b0f1a;
  --bg-soft: #12172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, sans-serif;
  background: linear-gradient(180deg, var(--bg), var(--bg-soft));
  color: var(--text);
}

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

/* ================= NAV ================= */

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
}

.nav nav a {
  margin-left: 1.5rem;
  color: var(--muted);
}

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

/* ================= HERO ================= */

.hero {
  min-height: 85vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 4rem);
  margin: 0;
}

.hero-subtitle {
  color: var(--muted);
  font-size: 1.25rem;
  margin-top: 1rem;
}

/* Buttons */
.hero-buttons {
  margin-top: 2.5rem;
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  display: inline-block;
}

.primary {
  background: var(--accent);
  color: #020617;
}

.secondary {
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* Secondary hero links */
.hero-links {
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.link-btn {
  color: var(--muted);
  transition: color 0.2s ease;
}

.link-btn:hover {
  color: var(--accent);
}

.link-sep {
  color: var(--muted);
  opacity: 0.6;
  user-select: none;
}

/* ================= SECTIONS ================= */

.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section h2 {
  font-size: 2.2rem;
  margin-bottom: 1.5rem;
}

/* ================= SKILLS ================= */

.skills-section {
  padding-top: 3rem;   /* ← positive spacing only */
}

.skills-about {
  max-width: 640px;
  margin: 0 auto 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.skills-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem 0.9rem;
}

.skills-line span {
  background: rgba(255, 255, 255, 0.035);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
  transition: background 0.2s ease, color 0.2s ease;
}

.skills-line span:hover {
  background: rgba(56, 189, 248, 0.18);
  color: var(--accent);
}

/* ================= EXPERIENCE ================= */

.experience {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.exp-item {
  max-width: 720px;
}

.exp-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  align-items: baseline;
}

.role {
  font-weight: 600;
  font-size: 1.05rem;
}

.company {
  color: var(--accent);
  font-weight: 500;
}

.time {
  color: var(--muted);
  font-size: 0.9rem;
}

.exp-desc {
  margin-top: 0.5rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ================= PROJECTS / PUBLICATIONS ================= */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: rgba(255,255,255,0.04);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s ease, background 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  background: rgba(255,255,255,0.08);
}

.card.minimal {
  display: flex;
  align-items: center;
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.4;
}

.card.minimal:hover {
  color: var(--accent);
}

/* ================= FOOTER ================= */

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