/* ---------- tokens: Amazon Prime palette ---------- */
:root {
  --ink: #0f171e;        /* Prime dark */
  --navy: #232f3e;       /* Amazon squid ink */
  --paper: #ffffff;
  --paper-2: #f2f4f7;
  --blue: #00a8e1;       /* Prime blue */
  --blue-ink: #0b6ea8;   /* blue on light backgrounds (AA) */
  --text-dark: #0f171e;
  --text-light: #ffffff;
  --muted-dark: rgba(15, 23, 30, 0.55);
  --muted-light: rgba(255, 255, 255, 0.55);
  --line-dark: rgba(15, 23, 30, 0.14);
  --line-light: rgba(255, 255, 255, 0.16);

  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;

  --rail: 56px;
  --pad: clamp(24px, 6vw, 96px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text-light);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
body.is-loading { overflow: hidden; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
.muted { color: var(--muted-light); }
.sec--light .muted { color: var(--muted-dark); }

/* ---------- loader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 50;
  background: var(--ink); color: var(--paper);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--pad);
  transition: transform 0.9s var(--ease);
}
.loader__num { font: 400 clamp(96px, 22vw, 260px)/0.85 var(--serif); letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.loader__label { margin-top: 16px; font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted-light); }
body.is-ready .loader { transform: translateY(-101%); pointer-events: none; }

/* ---------- rail + nav ---------- */
.rail {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--rail); z-index: 20;
  border-right: 1px solid var(--line-light);
  background: var(--ink); color: var(--paper);
  display: none; align-items: center; justify-content: space-between; flex-direction: column;
  padding: 20px 0;
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
}
.rail span { writing-mode: vertical-rl; transform: rotate(180deg); }
.rail__name { font-family: var(--serif); font-size: 13px; letter-spacing: 0.12em; }
.rail__top, .rail__bottom { color: var(--muted-light); }

.nav {
  position: fixed; top: 0; right: 0; z-index: 20;
  display: flex; gap: 22px; padding: 22px var(--pad);
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  mix-blend-mode: difference; color: #fff;
}
.nav a { position: relative; padding-bottom: 2px; }
.nav a::after { content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform 0.4s var(--ease); }
.nav a:hover::after { transform: scaleX(1); transform-origin: left; }

main { padding-left: 0; }
@media (max-width: 899px) {
  /* On small screens the nav lives at the top of the hero only and scrolls away. */
  .nav { position: absolute; left: 0; right: 0; justify-content: space-between; gap: 8px; padding: 20px var(--pad); font-size: 10px; letter-spacing: 0.14em; }
  .hero { padding-top: 80px; }
}
@media (min-width: 900px) {
  .rail { display: flex; }
  main { padding-left: var(--rail); }
}

/* ---------- sections ---------- */
.sec { position: relative; padding: calc(var(--pad) * 1.4) var(--pad); }
.sec--dark { background: var(--ink); color: var(--text-light); }
.sec--light { background: var(--paper-2); color: var(--text-dark); }
.sec + .sec--dark { border-top: 1px solid var(--line-light); }

.chapter { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: clamp(48px, 8vw, 120px); }
.chapter__num { font: 400 clamp(22px, 2.6vw, 34px)/1 var(--serif); letter-spacing: 0.02em; text-transform: uppercase; }
.chapter__label { font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted-light); }
.sec--light .chapter__label { color: var(--muted-dark); }

.eyebrow { font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--blue); margin-bottom: 20px; }
.sec--light .eyebrow { color: var(--blue-ink); }
.lead { font-size: clamp(18px, 2vw, 24px); line-height: 1.45; max-width: 34em; }
.meta { margin: 12px 0 24px; color: var(--muted-light); }
.sec--light .meta { color: var(--muted-dark); }
.h-sans { font: 500 clamp(34px, 5vw, 72px)/1 var(--sans); letter-spacing: -0.02em; }
.h-serif { font: 400 clamp(72px, 16vw, 220px)/0.85 var(--serif); letter-spacing: -0.03em; text-transform: uppercase; }

.bullets li { position: relative; padding-left: 20px; margin-top: 8px; max-width: 42em; }
.bullets li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 10px; height: 1px; background: var(--blue); }

.card { margin-top: 40px; padding: 24px 0 0; border-top: 1px solid var(--line-dark); max-width: 36em; }
.sec--dark .card { border-color: var(--line-light); }

.arrow-link { display: inline-block; margin-top: 32px; font-weight: 500; }
.arrow-link::after { content: " →"; display: inline-block; transition: transform 0.4s var(--ease); }
.arrow-link:hover::after { transform: translateX(6px); }

.grid-2 { display: grid; gap: clamp(40px, 6vw, 96px); grid-template-columns: 1fr; }
.about p + p { margin-top: 1em; }
@media (min-width: 900px) { .grid-2 { grid-template-columns: 1.1fr 1fr; } }

/* ---------- hero ---------- */
.hero {
  min-height: 100svh;
  display: grid; align-content: space-between;
  gap: clamp(40px, 6vw, 80px);
  padding: calc(var(--pad) * 1.2) var(--pad) var(--pad);
  grid-template-columns: 1fr;
  grid-template-areas: "name" "role" "intro" "meta";
}
.hero__name { grid-area: name; font: 400 clamp(64px, 13.5vw, 190px)/0.86 var(--serif); letter-spacing: -0.03em; text-transform: uppercase; }
.hero__name .line { display: block; overflow: hidden; }
.hero__name .line > span { display: block; transform: translateY(110%); transition: transform 1.1s var(--ease); }
body.is-ready .hero__name .line:nth-child(1) > span { transform: none; transition-delay: 0.15s; }
body.is-ready .hero__name .line:nth-child(2) > span { transform: none; transition-delay: 0.27s; }

.hero__role { grid-area: role; }
.hero__role-title { display: block; font: 500 clamp(22px, 2.6vw, 34px)/1.15 var(--sans); letter-spacing: -0.01em; }
.hero__role-co { display: block; font: italic 400 clamp(20px, 2.4vw, 30px)/1.2 var(--serif); color: var(--blue); }
.hero__intro { grid-area: intro; max-width: 30em; color: var(--muted-light); }
.hero__meta { grid-area: meta; display: grid; grid-template-columns: 1fr 1fr auto; gap: 24px; align-items: end; font-size: 13px; }
.hero__scroll { font: 400 clamp(22px, 2.4vw, 32px)/1 var(--serif); text-transform: uppercase; letter-spacing: 0.04em; }
.hero__scroll::after { content: ""; display: block; height: 1px; background: var(--blue); margin-top: 8px; transform-origin: left; animation: scrollcue 2.2s var(--ease) infinite; }
@keyframes scrollcue { 0% { transform: scaleX(0); } 50% { transform: scaleX(1); transform-origin: left; } 51% { transform-origin: right; } 100% { transform: scaleX(0); transform-origin: right; } }

@media (max-width: 899px) {
  .hero { padding-top: 88px; gap: 36px; align-content: start; grid-template-rows: auto auto 1fr auto; }
  .hero__intro { align-self: start; }
  .hero__meta { align-self: end; grid-template-columns: 1fr 1fr; }
  .hero__scroll { grid-column: 1 / -1; justify-self: start; }
}
@media (min-width: 900px) {
  .hero {
    grid-template-columns: 1.4fr 1fr;
    grid-template-areas: "name role" "name intro" "meta meta";
  }
  .hero__role, .hero__intro { align-self: start; padding-top: 8px; }
}

/* ---------- experience ---------- */
.xp { border-top: 1px solid var(--line-light); }
.xp__row { padding: 28px 0 32px; border-bottom: 1px solid var(--line-light); }
.xp__head { display: grid; gap: 8px 32px; grid-template-columns: 1fr; align-items: baseline; }
.xp__role { font: 500 clamp(26px, 3.6vw, 52px)/1.05 var(--sans); letter-spacing: -0.02em; transition: color 0.4s var(--ease), transform 0.5s var(--ease); }
.xp__row:hover .xp__role { color: var(--blue); transform: translateX(8px); }
.xp__co { font: italic 400 clamp(18px, 2vw, 24px)/1.2 var(--serif); }
.xp__when { font-size: 13px; line-height: 1.5; }
.xp__body { margin-top: 18px; max-width: 46em; color: rgba(255, 255, 255, 0.78); }
.is-current .xp__role::before { content: "●"; color: var(--blue); font-size: 0.4em; vertical-align: middle; margin-right: 14px; }
@media (min-width: 900px) {
  .xp__head { grid-template-columns: 1.4fr 0.8fr 0.5fr; }
  .xp__body { margin-left: calc(100% / 2.7 * 1.4); }
}

/* ---------- education columns ---------- */
.cols { display: grid; gap: 0; grid-template-columns: 1fr; border-top: 1px solid var(--line-dark); margin-top: clamp(40px, 6vw, 80px); }
.col { padding: 32px 0 40px; border-bottom: 1px solid var(--line-dark); display: grid; gap: 24px; }
.col__num { font: 400 clamp(48px, 6vw, 84px)/0.9 var(--serif); }
.col__title { font: 400 clamp(22px, 2.2vw, 30px)/1.15 var(--serif); }
.col__text { font-size: 14px; line-height: 1.6; }
@media (min-width: 900px) {
  .cols { grid-template-columns: repeat(4, 1fr); border-top: 0; }
  .col { padding: 0 28px 0 0; border-bottom: 0; border-left: 1px solid var(--line-dark); padding-left: 24px; grid-template-rows: auto 1fr auto; min-height: 380px; }
}

/* ---------- skills ---------- */
.skills { display: grid; gap: 40px; grid-template-columns: 1fr; margin-bottom: clamp(48px, 8vw, 96px); }
@media (min-width: 900px) { .skills { grid-template-columns: repeat(3, 1fr); gap: 32px; } }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags li { padding: 8px 14px; border: 1px solid var(--line-light); border-radius: 999px; font-size: 13px; transition: border-color 0.3s, color 0.3s; }
.tags li:hover { border-color: var(--blue); color: var(--blue); }
.langs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 32px; border-top: 1px solid var(--line-light); }
.langs li { display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line-light); font-size: 15px; }
.langs__name { font: 400 clamp(20px, 2vw, 26px)/1 var(--serif); }
@media (min-width: 900px) { .langs { grid-template-columns: repeat(4, 1fr); } }

/* ---------- contact ---------- */
.sec--contact { min-height: 90svh; display: grid; align-content: space-between; gap: 48px; }
.sec--contact .h-serif { color: var(--navy); }
.contact { display: grid; gap: 12px; font-size: clamp(18px, 2.2vw, 28px); }
.contact a { border-bottom: 1px solid transparent; transition: border-color 0.3s, color 0.3s; }
.contact a:hover { color: var(--blue-ink); border-color: var(--blue-ink); }
.foot { font-size: 12px; letter-spacing: 0.08em; }

.sec--404 { min-height: 100svh; display: grid; align-content: space-between; }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.xp__row.reveal.in:nth-child(n) { transition-delay: calc(var(--i, 0) * 60ms); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .loader { display: none; }
  .hero__name .line > span, .reveal { transform: none !important; opacity: 1 !important; transition: none !important; }
  .hero__scroll::after { animation: none; transform: none; }
}

/* ---------- smaller type on phones ---------- */
@media (max-width: 899px) {
  body { font-size: 15px; line-height: 1.5; }
  .lead { font-size: 17px; }
  .hero__intro, .xp__body, .about p:not(.lead), .card p, .col__text, .bullets li { font-size: 14px; }
  .meta, .xp__when, .langs li { font-size: 13px; }
  .h-sans { font-size: clamp(28px, 8vw, 40px); }
  .xp__role { font-size: clamp(22px, 6.5vw, 30px); }
  .xp__co { font-size: 18px; }
  .col__title { font-size: 20px; }
  .contact { font-size: 17px; }
  .tags li { font-size: 12px; padding: 6px 11px; }
}