/* ---------- Design tokens ---------- */
:root {
  --bg: #0b0f17;
  --bg-elev: #121826;
  --bg-card: #141b2b;
  --text: #e6edf3;
  --text-muted: #8b96a7;
  --border: #232c3d;
  --accent: #64ffda;
  --accent-soft: rgba(100, 255, 218, 0.1);
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.6);
  --radius: 14px;
  --maxw: 1040px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --bg-card: #ffffff;
  --text: #0f1826;
  --text-muted: #5b6675;
  --border: #e3e8ef;
  --accent: #0ca678;
  --accent-soft: rgba(12, 166, 120, 0.1);
  --shadow: 0 10px 30px -14px rgba(15, 24, 38, 0.18);
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

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

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-weight: 700;
  color: var(--text);
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

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

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

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

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: rotate(20deg);
}

/* ---------- Hero ---------- */
.hero {
  padding: 120px 24px 90px;
}

.eyebrow {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.9rem;
  margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.hero-tagline {
  color: var(--text-muted);
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  max-width: 620px;
  margin: 0 0 34px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--accent);
  color: #04140f;
  box-shadow: var(--shadow);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

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

.socials {
  display: flex;
  gap: 18px;
}

.socials a {
  color: var(--text-muted);
  display: inline-flex;
  transition: color 0.2s ease, transform 0.2s ease;
}

.socials a:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

/* ---------- Sections ---------- */
.section {
  padding: 70px 24px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  margin-bottom: 40px;
}

.section-title span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 1.1rem;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
}

.about-text p {
  color: var(--text-muted);
  margin: 0 0 18px;
}

.skills {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.skill-group h3 {
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.skill-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.skill-group li {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  position: relative;
  padding-left: 18px;
}

.skill-group li::before {
  content: "▹";
  color: var(--accent);
  position: absolute;
  left: 0;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
}

.card-featured {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-folder {
  color: var(--accent);
  font-size: 1.6rem;
}

.card-links {
  display: flex;
  gap: 14px;
}

.card-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

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

.card-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  flex: 1;
  margin: 0 0 18px;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.tag-list li {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
}

/* ---------- Experience timeline ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 28px;
  border-left: 2px solid var(--border);
  padding-left: 28px;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.timeline-period {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 6px;
}

.timeline-body h3 {
  font-size: 1.1rem;
}

.timeline-body .at {
  color: var(--text-muted);
  font-weight: 500;
}

.timeline-body p {
  color: var(--text-muted);
  margin: 8px 0 0;
  font-size: 0.92rem;
}

/* ---------- Contact ---------- */
.contact {
  text-align: center;
  max-width: 620px;
}

.contact .section-title {
  justify-content: center;
}

.contact p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

.contact-details {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: center;
}

.contact-details a {
  color: var(--text-muted);
  text-decoration: none;
}

.contact-details a:hover {
  color: var(--accent);
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: 40px 24px 50px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer .socials {
  justify-content: center;
  margin-bottom: 16px;
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-links {
    display: none;
  }

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

  .hero {
    padding-top: 90px;
  }
}