/* ============================================================
   Design tokens
   ============================================================ */
:root {
  /* Color — slate base with a teal/cyan accent */
  --bg:            #0a0e1a;
  --bg-soft:       #0f1524;
  --surface:       #131a2c;
  --surface-2:     #1a2236;
  --border:        #25304a;
  --text:          #e6ecf7;
  --text-muted:    #9aa7c2;
  --text-faint:    #6b7794;
  --accent:        #5eead4;   /* teal */
  --accent-2:      #38bdf8;   /* sky */
  --accent-soft:   rgba(94, 234, 212, 0.12);

  /* Type */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing & shape */
  --radius:    14px;
  --radius-sm: 9px;
  --maxw:      1080px;
  --shadow:    0 20px 50px -20px rgba(0, 0, 0, 0.6);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 640px; }

/* Accessibility: skip link + visible focus */
.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  background: var(--accent);
  color: #07120f;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  transition: top 0.2s;
}
.skip-link:focus { top: 16px; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 60;
  transition: width 0.1s linear;
}

/* Back-to-top button */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 55;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  color: #07120f;
  background: var(--accent);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 8px 24px -8px var(--accent);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { transform: translateY(-2px); }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(10, 14, 26, 0.7);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.nav.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 14, 26, 0.88);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.nav__logo-mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  font-size: 0.82rem;
  font-weight: 800;
  color: #07120f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 14px -4px var(--accent);
  transition: transform 0.2s;
}
.nav__logo:hover .nav__logo-mark { transform: rotate(-6deg) scale(1.05); }
.nav__logo-name { transition: color 0.2s; }
.nav__logo:hover .nav__logo-name { color: var(--accent); }
.nav__links {
  display: flex;
  gap: 32px;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav__links a {
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
}
.nav__links a:hover,
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after { width: 100%; }
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}
.nav__links a:hover::after { width: 100%; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.nav__toggle span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, border-color 0.18s;
}
.btn--primary {
  background: var(--accent);
  color: #07120f;
  box-shadow: 0 8px 24px -8px var(--accent);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -8px var(--accent);
}
.btn--ghost {
  border-color: var(--border);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.btn--block { width: 100%; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero__text { max-width: 620px; }

/* Hero entrance — staggered rise-in on load */
@keyframes hero-rise {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: none; }
}
.hero__eyebrow,
.hero__subtitle,
.hero__lead,
.hero__actions,
.hero__media,
.hero__title {
  opacity: 0;
  animation: hero-rise 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
.hero__eyebrow  { animation-delay: 0.05s; }
.hero__title    { animation-delay: 0.15s; }
.hero__subtitle { animation-delay: 0.28s; }
.hero__lead     { animation-delay: 0.40s; }
.hero__actions  { animation-delay: 0.52s; }
.hero__media    { animation-delay: 0.30s; }
.hero__eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 18px;
}
.hero__title {
  font-size: clamp(2rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  white-space: nowrap;
  color: #eef3fb;
}
.hero__caret {
  display: inline-block;
  width: 0.1em;
  height: 0.92em;
  margin-left: 0.06em;
  vertical-align: baseline;
  transform: translateY(0.04em);
  background: var(--accent);
  border-radius: 1px;
  animation: caret-blink 1.05s steps(1) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }
.hero__subtitle {
  font-size: clamp(1.8rem, 6vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.hero__rotate {
  color: var(--accent);
  display: block;            /* always drop the phrase onto its own line */
  min-height: 1.1em;         /* reserve the line so layout doesn't jump */
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.hero__rotate.is-swapping { opacity: 0; transform: translateY(8px); }
.hero__lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 36px;
}
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero portrait */
.hero__media {
  position: relative;
  justify-self: center;
  width: min(320px, 70vw);
  aspect-ratio: 1;
}
.hero__media::after {
  /* accent ring offset behind the photo */
  content: '';
  position: absolute;
  inset: 16px -16px -16px 16px;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  z-index: -1;
  transition: inset 0.3s ease;
}
.hero__media:hover::after { inset: 10px -10px -10px 10px; }
.hero__photo,
.hero__photo-fallback {
  width: 100%;
  height: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.hero__photo-fallback {
  display: none; /* shown via JS only if the image fails to load */
  place-items: center;
  font-size: 4rem;
  font-weight: 800;
  color: #07120f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.hero__glow {
  position: absolute;
  top: -10%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18), transparent 60%);
  filter: blur(40px);
  z-index: 1;
  pointer-events: none;
}

/* ============================================================
   Sections
   ============================================================ */
.section { padding: 100px 0; }
.section__title {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  padding-bottom: 16px;
  margin-bottom: 34px;
}
.section__title::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 64px; height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.2s;
}
.section.is-visible .section__title::after { transform: scaleX(1); }
.section__title--center { justify-content: center; }
.section__title--center::after {
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
}
.section.is-visible .section__title--center::after { transform: translateX(-50%) scaleX(1); }
.section__num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
}

/* Reveal on scroll */
.section, .card, .skills__group { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.is-visible { opacity: 1; transform: none; }

/* ============================================================
   About
   ============================================================ */
.about {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 48px;
  align-items: start;
}
.about__text p { color: var(--text-muted); margin-bottom: 16px; }
.focus {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}
.focus__item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.98rem;
  color: var(--text);
}
.focus__icon {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  transition: transform 0.2s, background 0.2s;
}
.focus__icon svg { width: 19px; height: 19px; }
.focus__item:hover .focus__icon {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}
.about__card {
  background: linear-gradient(160deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 96px;
}
.dot {
  position: relative;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.dot::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--accent);
  animation: dot-pulse 2s ease-out infinite;
}
@keyframes dot-pulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(3.2); opacity: 0;   }
}
.about__facts { display: flex; flex-direction: column; gap: 6px; }
.about__fact {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
}
.about__fact:last-child { border-bottom: 0; }
.about__fact-icon {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  transition: transform 0.2s, background 0.2s;
}
.about__fact-icon svg { width: 19px; height: 19px; }
.about__fact:hover .about__fact-icon {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}
.about__fact-text { display: flex; flex-direction: column; gap: 1px; }
.about__fact dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-faint);
}
.about__fact dd {
  font-weight: 600;
  font-size: 0.96rem;
}

/* ============================================================
   Projects
   ============================================================ */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.12s ease, border-color 0.25s, box-shadow 0.25s;
}
/* Stretch the project link to cover the whole card */
.card__links a::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.card__links { display: flex; gap: 16px; font-family: var(--font-mono); }
.card__links a { color: var(--text-faint); transition: color 0.2s; font-size: 1.15rem; }
.card__links a:hover { color: var(--accent); }
.card__title { font-size: 1.3rem; font-weight: 700; }
.card__desc { color: var(--text-muted); font-size: 0.95rem; flex-grow: 1; }
.card__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.card__tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 100px;
}

/* ============================================================
   Skills
   ============================================================ */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.skills__group {
  background: linear-gradient(160deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.skills__group:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.skills__group h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  color: var(--accent);
}
.skills__group ul { list-style: none; }
.skills__group li {
  position: relative;
  padding: 9px 0 9px 22px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  transition: color 0.2s, padding-left 0.2s;
}
.skills__group li::before {
  content: '▹';
  position: absolute;
  left: 2px;
  color: var(--accent);
  transition: transform 0.2s;
}
.skills__group li:hover {
  color: var(--text);
  padding-left: 26px;
}
.skills__group li:hover::before { transform: translateX(3px); }
.skills__group li:last-child { border-bottom: 0; }

/* ============================================================
   Contact
   ============================================================ */
.section--contact { padding-bottom: 130px; }
.section--contact .container--narrow { max-width: 760px; }
.contact__lead {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 44px;
}
.contact__info {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 14px 0;
  margin-bottom: 48px;
  color: var(--text-muted);
  font-size: 0.98rem;
  font-weight: 500;
}
.contact__info-item {
  display: inline-flex;
  align-items: center;
  position: relative;
  white-space: nowrap;
}
/* thin vertical divider centered before every item except the first */
.contact__info-item:not(:first-child)::before {
  content: '';
  width: 1px;
  height: 16px;
  background: var(--border);
  margin: 0 24px;
}
.contact__info-item--status {
  gap: 8px;
  color: var(--accent);
  font-weight: 600;
}
.contact__cta {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.02rem;
  margin-bottom: 24px;
}
.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 17px 34px;
  transition: transform 0.2s, border-color 0.2s, color 0.2s, background 0.2s, box-shadow 0.2s;
}
.contact__link svg { flex-shrink: 0; width: 22px; height: 22px; }
.contact__link:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow);
}
.contact__link--primary {
  color: #07120f;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 8px 24px -8px var(--accent);
}
.contact__link--primary:hover {
  color: #07120f;
  box-shadow: 0 12px 30px -8px var(--accent);
}
.contact__copy {
  display: block;
  margin: 22px auto 0;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text-faint);
  background: none;
  border: 0;
  cursor: pointer;
  transition: color 0.2s;
}
.contact__copy:hover { color: var(--accent); }
.contact__copy.is-copied { color: var(--accent); }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.footer__socials { display: flex; gap: 28px; font-size: 0.9rem; }
.footer__socials a { color: var(--text-muted); transition: color 0.2s; }
.footer__socials a:hover { color: var(--accent); }
.footer__note {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* ============================================================
   Responsive
   ============================================================ */
/* Tablet & below — stack the two-column hero and about */
@media (max-width: 900px) {
  .hero { min-height: auto; padding: 120px 0 64px; }
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .hero__text { margin: 0 auto; }
  .hero__lead { margin-left: auto; margin-right: auto; }
  .hero__media { order: -1; width: min(260px, 56vw); }
  .hero__actions { justify-content: center; }
  .about { grid-template-columns: 1fr; gap: 32px; }
  .about__card { position: static; }
}

/* Mobile — nav drawer + tighter spacing */
@media (max-width: 760px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: fixed;
    inset: 70px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px;
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links a { padding: 14px 0; width: 100%; }
  .section { padding: 72px 0; }
  /* Contact facts read better stacked than as a wrapping divider row */
  .contact__info { flex-direction: column; gap: 12px; }
  .contact__info-item:not(:first-child)::before { display: none; }
}

/* Small phones */
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .section { padding: 56px 0; }
  .section__title { margin-bottom: 26px; }
  .hero { padding: 104px 0 56px; }
  .hero__lead { font-size: 1rem; }
  .nav__logo-name { display: none; }   /* keep just the CB mark on tiny screens */
  .contact__lead { font-size: 1.02rem; }
  .contact__links { flex-direction: column; align-items: stretch; }
  .contact__link { width: 100%; justify-content: center; }
  .to-top { width: 42px; height: 42px; right: 16px; bottom: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .section, .card, .skills__group { opacity: 1; transform: none; }
  .dot::after { animation: none; transform: scale(2); opacity: 0.25; }
  /* Hero entrance: show immediately, no stagger */
  .hero__eyebrow, .hero__title, .hero__subtitle,
  .hero__lead, .hero__actions, .hero__media {
    opacity: 1;
    animation: none;
  }
  /* Section underline: show without the draw-in */
  .section__title::after { transform: scaleX(1); }
  .section__title--center::after { transform: translateX(-50%) scaleX(1); }
  /* Hero caret: hold steady instead of blinking */
  .hero__caret { animation: none; }
}