:root {
  color-scheme: dark;
  --bg: #07090f;
  --surface: rgba(255,255,255,.04);
  --surface-strong: rgba(255,255,255,.08);
  --text: #f3f4f7;
  --text-muted: rgba(243,244,247,.68);
  --accent: #8fd6ff;
  --accent-soft: rgba(143,214,255,.16);
  --border: rgba(255,255,255,.08);
  --nav-bg: rgba(7,9,15,.82);
  --nav-border: rgba(255,255,255,.06);
  --card-bg: rgba(255,255,255,.04);
  --card-border: rgba(255,255,255,.08);
  --shadow: 0 24px 64px rgba(0,0,0,.35);
  --radius: 28px;
  --max-width: 1180px;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f0f4f8;
  --surface: rgba(0,0,0,.03);
  --surface-strong: rgba(0,0,0,.06);
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #0278d5;
  --accent-soft: rgba(2,120,213,.12);
  --border: rgba(0,0,0,.1);
  --nav-bg: rgba(240,244,248,.88);
  --nav-border: rgba(0,0,0,.08);
  --card-bg: rgba(255,255,255,.7);
  --card-border: rgba(0,0,0,.08);
  --shadow: 0 24px 64px rgba(0,0,0,.08);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(143,214,255,.14), transparent 30%),
    linear-gradient(160deg, #020308 0%, #0d1220 52%, #05060c 100%);
  transition: background .4s ease, color .3s ease;
}

html[data-theme="light"] body {
  background: linear-gradient(160deg, #dde8f5 0%, #f0f4f8 45%, #e8eef6 100%);
}

* {
  box-sizing: border-box;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ── Scroll-reveal ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s cubic-bezier(.16,1,.3,1), transform .65s cubic-bezier(.16,1,.3,1);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }

/* ── Page wrapper ─────────────────────────────────────────── */
.page {
  position: relative;
  min-height: 100vh;
}

/* ── Nav ──────────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 2rem;
  backdrop-filter: blur(20px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  transition: background .4s ease, border-color .4s ease;
}

.brand {
  font-weight: 700;
  letter-spacing: -.04em;
  font-size: 1.05rem;
  position: relative;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .05em;
  opacity: .75;
  transition: opacity .2s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width .25s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  opacity: 1;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  width: 100%;
}

#theme-toggle {
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
  opacity: .75;
  transition: opacity .2s ease, transform .3s ease;
}

#theme-toggle:hover {
  opacity: 1;
  transform: rotate(20deg) scale(1.15);
}

main,
footer {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items: center;
  gap: 4rem;
  min-height: calc(100vh - 7rem);
  padding: 8rem 2rem 4rem;
}

.hero-copy {
  max-width: 520px;
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(3rem, 6vw, 5.4rem);
  line-height: .94;
}

.hero-lines {
  display: grid;
  gap: .75rem;
  margin: 2rem 0 2.5rem;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-muted);
}

.hero-lines p {
  margin: 0;
}

/* ── Gradient text (animated title) ────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, #ff6b9d 25%, #feca57 50%, #48dbfb 75%, var(--accent) 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 6s ease infinite;
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

html[data-theme="light"] .gradient-text {
  background: linear-gradient(135deg, #0d47a1 0%, #7b1fa2 25%, #f57c00 50%, #00838f 75%, #0d47a1 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 6s ease infinite;
}

/* ── Accent links in text ──────────────────────────────────── */
.link-accent {
  position: relative;
  color: var(--accent);
  font-weight: 600;
  transition: opacity .2s ease;
}

.link-accent::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
  opacity: 0;
  transition: opacity .3s ease;
}

.link-accent:hover,
.link-accent:focus-visible {
  opacity: .85;
}

.link-accent:hover::after,
.link-accent:focus-visible::after {
  opacity: 1;
}

/* ── Social icons ─────────────────────────────────────────── */
.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  width: 46px;
  height: 46px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform .25s cubic-bezier(.34,1.56,.64,1), background .25s ease, color .25s ease, border-color .25s ease;
}

.social-links a:hover,
.social-links a:focus-visible {
  transform: translateY(-4px) scale(1.08);
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Hero image ───────────────────────────────────────────── */
.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  width: min(100%, 540px);
  border-radius: 32px;
  border: 1px solid var(--border);
  box-shadow: 0 40px 120px rgba(0,0,0,.3);
  transition: transform .5s cubic-bezier(.34,1.56,.64,1), box-shadow .5s ease;
}

.hero-image img:hover {
  transform: scale(1.025) rotate(.5deg);
}

/* ── Section title ────────────────────────────────────────── */
.section-title {
  margin: 6rem 0 1.5rem;
  font-size: clamp(2.2rem, 4vw, 3rem);
  color: var(--text);
}

/* ── Projects grid ────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
  padding: 0 2rem 4rem;
}

.project-card {
  border-radius: var(--radius);
  padding: 2rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  display: grid;
  gap: 1.5rem;
  transition: transform .35s cubic-bezier(.34,1.56,.64,1), border-color .3s ease, box-shadow .3s ease;
  will-change: transform;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 32px 80px rgba(143,214,255,.12), var(--shadow);
}

html[data-theme="light"] .project-card:hover {
  box-shadow: 0 0 0 1px var(--accent), 0 32px 80px rgba(2,120,213,.1), var(--shadow);
}

.project-preview {
  display: grid;
  gap: 1rem;
}

.project-title {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 600;
  color: var(--text);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: .8rem 1.2rem;
  border-radius: 12px;
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .05em;
  transition: background .2s ease, transform .2s ease, color .2s ease;
}

.project-link:hover {
  background: var(--accent);
  color: #fff;
  transform: translateX(3px);
}

html[data-theme="light"] .project-link:hover {
  color: #fff;
}

.project-link i {
  font-size: 1rem;
}

.project-description {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: .95rem;
}

/* ── Resume placeholder & container ───────────────────────── */
.resume-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.resume-container embed {
  display: block;
}

.resume-placeholder {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 3rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.resume-placeholder p:first-child {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 1rem;
}

.resume-placeholder p:last-child {
  color: var(--text-muted);
  line-height: 1.8;
  margin: 0;
}

.resume-placeholder code {
  background: var(--surface-strong);
  padding: .3rem .6rem;
  border-radius: 6px;
  font-family: 'Courier New', monospace;
  color: var(--accent);
}

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  padding: 2rem;
}

/* ── Scroll hint ──────────────────────────────────────────── */
.scroll-hint {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  animation: bounce 2s ease-in-out infinite;
  opacity: .5;
  transition: opacity .3s ease;
  pointer-events: none;
}

.scroll-hint:hover {
  opacity: 1;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

html[data-theme="light"] .scroll-hint {
  color: var(--text);
}

/* ── Cursor glow (both modes) ─────────────────────────────── */
@media (pointer: fine) {
  .cursor-glow {
    pointer-events: none;
    position: fixed;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(143,214,255,.07) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: opacity .4s ease, background .4s ease;
    z-index: 0;
    opacity: 0;
  }

  html[data-theme="light"] .cursor-glow {
    background: radial-gradient(circle, rgba(13,71,161,.05) 0%, transparent 70%);
    display: block;
  }
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 8.5rem;
  }

  .hero-image {
    order: -1;
  }
}

@media (max-width: 680px) {
  .site-nav {
    padding: 1rem 1.25rem;
  }

  .nav-links {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero {
    gap: 2.5rem;
    padding: 7.5rem 1.25rem 3rem;
  }

  .hero-copy h1 {
    font-size: clamp(2.8rem, 12vw, 4rem);
  }

  .social-links {
    justify-content: flex-start;
  }

  .projects-grid {
    padding: 0 0 3rem;
  }
}