/* =============================================================
   1. Custom properties
   ============================================================= */
:root {
  --bg: #0a0a0b;
  --surface: #131316;
  --surface-2: #18181c;
  --fg: #f4f4f6;
  --muted: #9b9ba3;
  --muted-2: #6c6c74;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --accent: #5b6cff;
  --accent-fg: #ffffff;
  --cream: #f4f4f6;

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: "Space Grotesk", var(--sans);
  --mono: "JetBrains Mono", ui-monospace, monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-soft: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --header-h: 76px;
}

/* =============================================================
   2. Reset
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html {
  -webkit-text-size-adjust: 100%;
  tab-size: 2;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.05; letter-spacing: -0.02em; font-family: var(--display); }
ul { list-style: none; padding: 0; }
input, textarea { font: inherit; color: inherit; background: none; }
::selection { background: var(--accent); color: var(--accent-fg); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--accent); color: var(--accent-fg);
  z-index: 9999; border-radius: 8px; font-weight: 600; font-size: .9rem;
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   3. Layout helpers
   ============================================================= */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) var(--gutter);
  border-top: 1px solid var(--border);
}
.section__head { margin-bottom: clamp(2.5rem, 6vw, 4rem); max-width: 640px; }
.section__num {
  display: inline-block; font-family: var(--mono); font-size: .8rem;
  color: var(--accent); letter-spacing: .08em; margin-bottom: .9rem;
}
.section__title { font-size: clamp(1.9rem, 4.2vw, 2.8rem); font-weight: 600; }
.section__sub { margin-top: .9rem; color: var(--muted); font-size: 1.05rem; max-width: 52ch; }

.eyebrow {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 1.2rem;
}

/* =============================================================
   4. Buttons
   ============================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.6rem; border-radius: 999px; font-weight: 600; font-size: .95rem;
  transition: transform .35s var(--ease-out), background-color .35s var(--ease-out), color .35s var(--ease-out), border-color .35s var(--ease-out);
  white-space: nowrap;
}
.btn--primary { background: var(--fg); color: var(--bg); }
.btn--primary:hover { background: var(--accent); color: var(--accent-fg); transform: translateY(-2px); }
.btn--ghost { border: 1px solid var(--border-strong); color: var(--fg); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--sm { padding: .6rem 1.2rem; font-size: .85rem; }
.btn--block { width: 100%; }

/* =============================================================
   5. Splash
   ============================================================= */
.splash {
  position: fixed; inset: 0; z-index: 9998; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity .6s var(--ease-out), visibility .6s var(--ease-out);
}
.splash__mark {
  font-family: var(--display); font-weight: 700; font-size: 2.4rem; color: var(--fg);
  opacity: 0; animation: splashPulse 1.1s var(--ease-out) forwards;
}
@keyframes splashPulse { from { opacity: 0; transform: scale(.9); } to { opacity: 1; transform: scale(1); } }
.splash.is-hidden { opacity: 0; visibility: hidden; pointer-events: none; }

/* =============================================================
   6. Header / Nav
   ============================================================= */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(10, 10, 11, 0.6);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color .4s var(--ease-out), transform .4s var(--ease-out);
}
.header.is-scrolled { border-bottom-color: var(--border); }
.header.is-hidden { transform: translateY(-100%); }

.header__inner {
  width: 100%; max-width: var(--container); margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex; align-items: center; justify-content: space-between;
}
.header__logo { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: -.02em; }

.nav { display: none; align-items: center; gap: 2rem; }
.nav__link {
  position: relative; font-size: .92rem; color: var(--muted);
  transition: color .3s var(--ease-out);
}
.nav__link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease-out);
}
.nav__link:hover, .nav__link.is-active { color: var(--fg); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); }

.burger {
  display: flex; flex-direction: column; gap: 5px; padding: .4rem; z-index: 600;
}
.burger span { display: block; width: 22px; height: 2px; background: var(--fg); transition: transform .3s var(--ease-out), opacity .3s var(--ease-out); }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; top: var(--header-h); z-index: 400;
  background: var(--bg); padding: 2rem var(--gutter);
  display: flex; flex-direction: column; gap: 1.6rem;
  transform: translateY(-12px); opacity: 0; visibility: hidden;
  transition: transform .4s var(--ease-out), opacity .4s var(--ease-out), visibility .4s;
}
.mobile-menu.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
.mobile-menu a { font-family: var(--display); font-size: 1.6rem; font-weight: 500; }
.mobile-menu .btn { align-self: flex-start; margin-top: .5rem; }

/* =============================================================
   7. Hero
   ============================================================= */
.hero {
  position: relative; min-height: 100svh; display: flex; flex-direction: column;
  align-items: flex-start; justify-content: center;
  padding: calc(var(--header-h) + 2rem) var(--gutter) 4rem;
  max-width: var(--container); margin: 0 auto; overflow: clip;
}
.hero__bg { position: absolute; inset: 0; z-index: -1; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero__ghost {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(6rem, 22vw, 20rem);
  color: transparent; -webkit-text-stroke: 1px var(--border-strong);
  white-space: nowrap; user-select: none; letter-spacing: -.03em;
}
.hero__title {
  display: flex; flex-direction: column; gap: 0;
  font-size: clamp(3rem, 10vw, 6.4rem); font-weight: 700; letter-spacing: -.03em;
}
.hero__lede { margin-top: 1.6rem; max-width: 46ch; font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); }
.hero__actions { margin-top: 2.4rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.scroll-cue {
  position: absolute; bottom: 2.2rem; left: var(--gutter);
  display: flex; align-items: center; gap: .6rem;
  color: var(--muted-2); font-family: var(--mono); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase;
}
.scroll-cue svg { animation: bob 2s ease-in-out infinite; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(5px); } }

/* =============================================================
   8. Quick facts
   ============================================================= */
.facts { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.facts__grid {
  max-width: var(--container); margin: 0 auto; padding: 1.5rem var(--gutter);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;
}
.fact { display: flex; flex-direction: column; gap: .3rem; }
.fact__value { font-family: var(--display); font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 600; color: var(--accent); }
.fact__label { color: var(--muted); font-size: .85rem; }

/* =============================================================
   9. About
   ============================================================= */
.about { display: grid; gap: 2.4rem; margin-bottom: 3.5rem; }
.about__photo-frame {
  aspect-ratio: 4/5; border-radius: 20px; border: 1px dashed var(--border-strong);
  background: var(--surface); display: flex; align-items: center; justify-content: center;
  color: var(--muted-2); font-family: var(--mono); font-size: .85rem; max-width: 320px;
}
.about__text { display: flex; flex-direction: column; gap: 1.1rem; color: var(--muted); font-size: 1.05rem; max-width: 60ch; }
.about__text strong { color: var(--fg); }

.timeline { margin-bottom: 3rem; }
.timeline__title { font-size: 1.1rem; color: var(--muted); font-weight: 500; margin-bottom: 1.6rem; }
.timeline__track { display: flex; flex-direction: column; }
.timeline__item {
  display: grid; grid-template-columns: 90px 1fr; gap: 1.4rem;
  padding: 1.3rem 0; border-top: 1px solid var(--border); align-items: baseline;
}
.timeline__item:last-child { border-bottom: 1px solid var(--border); }
.timeline__year { font-family: var(--mono); color: var(--accent); font-weight: 500; }
.timeline__text { color: var(--muted); }

.education { margin-bottom: 3rem; }
.education__title { font-size: 1.1rem; color: var(--muted); font-weight: 500; margin-bottom: .8rem; }
.education__item { color: var(--muted-2); font-style: italic; }

.now-card {
  display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: flex-start;
  padding: 1.6rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
}
.now-card__dot { width: 10px; height: 10px; border-radius: 50%; background: #2ecc71; margin-top: .5rem; box-shadow: 0 0 0 4px rgba(46,204,113,.15); animation: pulseDot 2.4s ease-in-out infinite; }
@keyframes pulseDot { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
.now-card__title { font-size: 1rem; margin-bottom: .5rem; }
.now-card p { color: var(--muted); }
.now-card__status { margin-top: .6rem; color: var(--accent) !important; font-family: var(--mono); font-size: .82rem; }

/* =============================================================
   10. Experience
   ============================================================= */
.exp-list { display: flex; flex-direction: column; gap: 1.2rem; }
.exp-card { border: 1px solid var(--border); border-radius: 18px; background: var(--surface); overflow: hidden; }
.exp-card__head { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: flex-start; padding: 1.8rem; cursor: pointer; }
.exp-card__title { font-size: 1.3rem; margin-bottom: .3rem; }
.exp-card__role { color: var(--accent); font-size: .95rem; margin-bottom: .6rem; }
.exp-card__period { font-family: var(--mono); font-size: .8rem; color: var(--muted-2); }
.exp-card__summary { color: var(--muted); max-width: 60ch; margin-top: .8rem; }
.exp-card__toggle {
  flex-shrink: 0; display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--mono); font-size: .78rem; color: var(--fg);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: .5rem 1rem;
}
.exp-card__toggle svg { transition: transform .35s var(--ease-out); }
.exp-card.is-open .exp-card__toggle svg { transform: rotate(45deg); }

.exp-card__body { max-height: 0; overflow: hidden; transition: max-height .5s var(--ease-soft); }
.exp-card.is-open .exp-card__body { max-height: 900px; }
.exp-card__groups { display: grid; gap: 1.6rem; padding: 0 1.8rem 1.8rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.exp-group__title { font-family: var(--mono); font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); margin-bottom: .7rem; }
.exp-group li { color: var(--muted); font-size: .92rem; padding: .3rem 0; border-top: 1px solid var(--border); }
.exp-group li:first-child { border-top: none; }

/* =============================================================
   11. Projects
   ============================================================= */
.projects { display: flex; flex-direction: column; }
.project-card {
  display: grid; grid-template-columns: 70px 1fr auto; gap: 1.6rem; align-items: center;
  padding: 2rem 0; border-top: 1px solid var(--border);
  transition: padding-left .4s var(--ease-out), background-color .4s var(--ease-out);
}
.projects > .project-card:last-child { border-bottom: 1px solid var(--border); }
.project-card:hover { padding-left: .8rem; background: var(--surface); }
.project-card__num { font-family: var(--mono); color: var(--muted-2); font-size: .95rem; }
.project-card__name { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: .4rem; }
.project-card__category { color: var(--accent); font-size: .9rem; margin-bottom: .6rem; }
.project-card__desc { color: var(--muted); max-width: 55ch; margin-bottom: .9rem; }
.project-card__tags { display: flex; gap: .5rem; flex-wrap: wrap; }
.tag { font-family: var(--mono); font-size: .7rem; letter-spacing: .05em; color: var(--muted); border: 1px solid var(--border-strong); border-radius: 999px; padding: .25rem .7rem; }
.project-card__link {
  display: inline-flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .92rem;
  white-space: nowrap; transition: gap .35s var(--ease-out), color .35s var(--ease-out);
}
.project-card:hover .project-card__link { gap: .9rem; color: var(--accent); }

/* =============================================================
   12. Skills
   ============================================================= */
.skills { display: grid; gap: 1.4rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.skill-card { border: 1px solid var(--border); border-radius: 16px; padding: 1.8rem; background: var(--surface); }
.skill-card__title { font-family: var(--mono); font-size: .8rem; letter-spacing: .07em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.2rem; }
.skill-card li { color: var(--muted); padding: .5rem 0; border-top: 1px solid var(--border); font-size: .95rem; }
.skill-card li:first-child { border-top: none; }

/* =============================================================
   13. Contact
   ============================================================= */
.contact { display: grid; gap: 2.5rem; }
.contact__info { display: flex; flex-direction: column; gap: 0; }
.contact__row {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 1.3rem 0; border-top: 1px solid var(--border);
  transition: color .3s var(--ease-out), padding-left .3s var(--ease-out);
}
.contact__info .contact__row:last-child { border-bottom: 1px solid var(--border); }
.contact__row:hover { color: var(--accent); padding-left: .5rem; }
.contact__label { font-family: var(--mono); font-size: .78rem; color: var(--muted-2); text-transform: uppercase; letter-spacing: .06em; }
.contact__value { font-weight: 600; font-size: 1.05rem; }

.contact__form { display: flex; flex-direction: column; gap: 1.1rem; }
.field { display: flex; flex-direction: column; gap: .5rem; }
.field label { font-family: var(--mono); font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.field input, .field textarea {
  border: 1px solid var(--border-strong); border-radius: 10px; padding: .85rem 1rem;
  background: var(--surface); transition: border-color .3s var(--ease-out);
  resize: vertical;
}
.field input:focus, .field textarea:focus { border-color: var(--accent); outline: none; }
.field__status { font-size: .88rem; min-height: 1.2em; color: var(--muted); }
.field__status.is-success { color: #2ecc71; }
.field__status.is-error { color: #ff6b6b; }

/* =============================================================
   14. Footer
   ============================================================= */
.footer { border-top: 1px solid var(--border); }
.footer__inner {
  max-width: var(--container); margin: 0 auto; padding: 3rem var(--gutter);
  display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between;
}
.footer__name { font-family: var(--display); font-weight: 600; }
.footer__role { color: var(--muted); font-size: .9rem; margin-top: .2rem; }
.footer__links { display: flex; flex-direction: column; gap: .6rem; }
.footer__links a { color: var(--muted); font-size: .92rem; transition: color .3s var(--ease-out); }
.footer__links a:hover { color: var(--fg); }
.footer__legal { color: var(--muted-2); font-size: .82rem; text-align: right; }
.footer__legal a { transition: color .3s var(--ease-out); }
.footer__legal a:hover { color: var(--fg); }

.to-top {
  position: fixed; right: 1.4rem; bottom: 1.4rem; z-index: 300;
  width: 44px; height: 44px; border-radius: 50%; background: var(--surface-2);
  border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .35s var(--ease-out), transform .35s var(--ease-out), visibility .35s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { border-color: var(--accent); color: var(--accent); }

/* =============================================================
   15. Reveal animations
   ============================================================= */
.reveal {
  opacity: 0; transform: translateY(18px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
  transition-delay: calc(var(--d, 0) * 90ms);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* =============================================================
   16. Responsive
   ============================================================= */
@media (min-width: 720px) {
  .facts__grid { grid-template-columns: repeat(4, 1fr); }
  .about { grid-template-columns: 300px 1fr; align-items: start; }
}

@media (min-width: 960px) {
  .nav { display: flex; }
  .burger { display: none; }
  .mobile-menu { display: none; }
  .contact { grid-template-columns: 1fr 1.2fr; }
}

@media (min-width: 1280px) {
  .section { padding-left: 0; padding-right: 0; }
}

/* =============================================================
   17. Reduced motion (only intrusive effects)
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .now-card__dot, .scroll-cue svg, .splash__mark { animation: none; }
  .reveal { transition-duration: .01ms; transform: none; opacity: 1; }
}