/* ══════════════════════════════════════════════════════════════════════
   Aditya Tak — portfolio
   Structure and layout only. Every colour, font and rule weight comes
   from css/tokens.css; nothing below names a hex.
   ══════════════════════════════════════════════════════════════════ */

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

/* In-page links land under a sticky header unless the target reserves room. */
:target,
section[id],
#top { scroll-margin-top: 76px; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--font-body-size);
  line-height: var(--font-body-leading);
  color: var(--color-text);
  background: var(--color-bg);
  background-image: var(--page-texture);
  background-size: var(--page-texture-size);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
}

p { margin: 0; }

a { color: var(--color-accent); text-underline-offset: 3px; }
a:hover { color: var(--color-accent-700); }

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

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 10px 14px;
}
.skip-link:focus {
  left: var(--gutter);
  top: 10px;
}

/* — shared shell — */
.shell {
  max-width: var(--measure);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.hr {
  height: var(--rule);
  border: 0;
  margin: var(--space-4) 0;
  background: var(--color-divider);
}

/* — animation —
   Nothing moves on load beyond a short rise on the first screen. */
@keyframes mrq   { from { transform: translateX(0) }    to { transform: translateX(-50%) } }
@keyframes rise  { from { opacity: 0; transform: translateY(18px) } to { opacity: 1; transform: none } }
@keyframes fade  { from { opacity: 0 }                  to { opacity: 1 } }
@keyframes slidein  { from { transform: translateX(101%) } to { transform: none } }
@keyframes slideout { from { transform: none } to { transform: translateX(101%) } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

/* ── buttons and tags ──────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--color-text);
  background: transparent;
  border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: var(--radius-md);
}
.btn-primary { background: var(--color-accent); color: var(--color-bg); }
.btn-primary:hover { background: var(--color-accent-600); color: var(--color-bg); }
.btn-primary:active { background: var(--color-accent-700); }
.btn-secondary { border-color: var(--color-divider); }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); color: var(--color-text); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, transparent); }
.btn-lg { font-size: 15px; padding: 12px 20px; }

.tag {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  letter-spacing: 0.02em;
  padding: 3px 10px;
  border-radius: calc(var(--radius-md) * 0.75);
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
}

/* ── header ────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-bg);
  border-bottom: var(--rule) solid var(--color-divider);
}
.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  padding-block: 14px;
}
.brand {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 17px;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--color-text);
  margin-right: auto;
}
.brand:hover { color: var(--color-text); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.site-nav a { color: var(--color-text); text-decoration: none; }
.site-nav a:hover { color: var(--color-accent); }

.sound-toggle {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 10px;
  letter-spacing: 0.12em;
  background: none;
  border: 1px solid var(--color-divider);
  color: var(--color-text);
  padding: 6px 9px;
  cursor: pointer;
}
.sound-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }

.progress {
  position: absolute;
  left: 0;
  bottom: calc(var(--rule) * -1);
  height: var(--rule);
  width: 0;
  background: var(--color-accent);
}

/* ── hero ──────────────────────────────────────────────────────────── */

.hero { padding-block: 84px 64px; }
.hero__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 48px 56px;
  align-items: flex-start;
}
.hero__main { flex: 1 1 440px; min-width: 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
  margin-bottom: 26px;
  animation: fade .5s ease both;
}
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  display: block;
  flex: none;
}

.hero h1 {
  font-size: clamp(38px, 6.4vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  max-width: 17ch;
  animation: rise .6s ease both .05s;
}
.hero h1 em { font-style: normal; color: var(--color-accent); }

.hero__lead {
  margin-top: 32px;
  max-width: 60ch;
  font-size: 19px;
  color: var(--color-neutral-800);
  animation: rise .6s ease both .14s;
}
.hero__lead strong { color: var(--color-text); font-weight: 600; }

.arc {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  animation: rise .6s ease both .22s;
}
.arc__step {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: none;
  border: 0;
  border-bottom: var(--rule) solid var(--color-divider);
  padding: 2px 0;
  color: var(--color-text);
  text-decoration: none;
  cursor: pointer;
}
.arc__step:hover { border-bottom-color: var(--color-accent); color: var(--color-accent); }
.arc__step--current { border-bottom-color: var(--color-accent); cursor: pointer; }
.arc__sep { color: var(--color-accent); }
.arc__note {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-neutral-700);
  animation: fade .6s ease both .3s;
}

.hero__aside {
  flex: 1 1 240px;
  max-width: 300px;
  border-left: var(--rule) solid var(--color-divider);
  padding-left: 22px;
  animation: fade .7s ease both .2s;
}
.badge-open {
  display: inline-block;
  margin-bottom: 18px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 5px 9px;
}
.facts {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 4px 12px;
}
.facts dt {
  color: var(--color-neutral-700);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 11px;
  padding-top: 3px;
}
.facts dd { margin: 0; }

/* ── marquee ───────────────────────────────────────────────────────── */

.marquee {
  background: var(--color-text);
  color: var(--color-bg);
  overflow: hidden;
  padding: 15px 0;
  user-select: none;
}
.marquee__track {
  display: flex;
  width: max-content;
  animation: mrq 44s linear infinite;
}
.marquee__group {
  display: flex;
  gap: 40px;
  padding-right: 40px;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 15px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.marquee__group i { font-style: normal; color: var(--color-accent-500); }

/* ── section headers ───────────────────────────────────────────────── */

.section { padding-top: 76px; }

.section__head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 34px;
}
.section__num {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 13px;
  color: var(--color-accent-text);
  letter-spacing: 0.08em;
}
.section__head h2 {
  font-size: clamp(26px, 3.4vw, 40px);
  letter-spacing: -0.02em;
}
.section__aside {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
}

/* ── 01 · stat grid ────────────────────────────────────────────────── */

.stats {
  display: grid;
  /* Six cells: three columns divide exactly, two below that, one on a phone.
     auto-fit would fit five across at full width and leave four cells of
     bare divider showing. */
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  background: var(--color-divider);
  border: var(--rule) solid var(--color-divider);
}
@media (max-width: 860px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .stats { grid-template-columns: 1fr; } }
.stat { background: var(--color-bg); padding: 26px 24px 24px; }
.stat__label {
  margin-bottom: 10px;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-text);
}
.stat__value {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
}
.stat__note {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-neutral-800);
  line-height: 1.45;
}

/* ── 02 · chapters ─────────────────────────────────────────────────── */

.chapters { border-top: var(--rule) solid var(--color-divider); }

.chapter {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: var(--rule) solid var(--color-divider);
  padding: 30px 4px;
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 17px;
}
.chapter:hover { background: var(--color-accent-100); }

.chapter__meta {
  flex: 0 1 190px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
  line-height: 1.8;
  padding-top: 4px;
}
.chapter__main { flex: 1 1 380px; min-width: 0; }
.chapter__title {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: clamp(21px, 2.4vw, 29px);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.chapter__desc {
  display: block;
  margin-top: 12px;
  color: var(--color-neutral-800);
  font-size: 16px;
  max-width: 60ch;
}
.chapter__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.chapter__cue {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-accent-text);
  padding-top: 8px;
  margin-left: auto;
  text-align: right;
}

/* ── 03 · building now ─────────────────────────────────────────────── */

.panel { border: var(--rule) solid var(--color-divider); }
.panel__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 13px 22px;
  border-bottom: var(--rule) solid var(--color-divider);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
}
.panel__name {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  color: var(--color-text);
}
.panel__status {
  margin-left: auto;
  background: var(--color-text);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 10px;
  letter-spacing: 0.1em;
  padding: 4px 8px;
}
.panel__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 36px 44px;
  padding: 32px 22px 36px;
}
.panel__statement {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.panel__statement em { font-style: normal; color: var(--color-accent); }
.panel__copy { margin-bottom: 14px; color: var(--color-neutral-800); font-size: 16px; }
.panel__copy + .panel__copy { margin-bottom: 22px; }
.link-strong {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  text-decoration: none;
  border-bottom: var(--rule) solid var(--color-accent);
  padding-bottom: 2px;
}
.link-strong:hover { color: var(--color-accent-700); border-bottom-color: var(--color-accent-700); }

/* ── 04 · about + timeline ─────────────────────────────────────────── */

.about {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 44px 64px;
  align-items: start;
  border-top: var(--rule) solid var(--color-divider);
  padding-top: 34px;
}
.about__copy { font-size: 17px; min-width: 0; }
.about__copy p + p { margin-top: 16px; }

.timeline { display: grid; }
.timeline__row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 22px;
}
.timeline__row:last-child { padding-bottom: 0; }
.timeline__year {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-accent-text);
  padding-top: 4px;
}
.timeline__body {
  border-left: var(--rule) solid var(--color-divider);
  padding-left: 20px;
}
.timeline__row--now .timeline__body { border-left-color: var(--color-accent); }
.timeline__body h3 { margin-bottom: 6px; font-size: 19px; letter-spacing: -0.015em; }
.timeline__body h3 span {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
}
.timeline__body p { color: var(--color-neutral-800); font-size: 15px; }

/* ── 05 · contact ──────────────────────────────────────────────────── */

.contact { margin-top: 76px; }
.contact__inner {
  border-top: var(--rule) solid var(--color-divider);
  padding-top: 56px;
  padding-bottom: 72px;
}
.contact__lead { max-width: 58ch; font-size: 18px; color: var(--color-neutral-800); }
.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.contact__note {
  margin-top: 34px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-neutral-700);
  max-width: 62ch;
  line-height: 1.8;
}

/* ── footer ────────────────────────────────────────────────────────── */

.site-footer { border-top: var(--rule) solid var(--color-divider); }
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  padding: 22px 0 40px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
}
.site-footer__links { display: flex; gap: 16px; }
.site-footer a { color: var(--color-neutral-700); text-decoration: none; }
.site-footer a:hover { color: var(--color-accent); }

/* ── case-study slide-over ─────────────────────────────────────────── */

.cs[hidden] { display: none; }

.cs__backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--color-neutral-900) 55%, transparent);
  animation: fade .3s ease both;
  border: 0;
  padding: 0;
  width: 100%;
  cursor: pointer;
}

.cs__panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(760px, 100%);
  z-index: 100;
  background: var(--color-bg);
  border-left: var(--rule) solid var(--color-text);
  overflow-y: auto;
  overscroll-behavior: contain;
  animation: slidein .38s cubic-bezier(.32,.72,.24,1) both;
}
.cs--closing .cs__panel { animation: slideout .26s ease both; }
.cs--closing .cs__backdrop { animation: fade .26s ease reverse both; }

.cs__bar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-bg);
  border-bottom: var(--rule) solid var(--color-divider);
  padding: 16px clamp(20px, 4vw, 40px);
  z-index: 2;
}
.cs__meta {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-neutral-700);
}
.cs__close {
  margin-left: auto;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 11px;
  letter-spacing: 0.1em;
  background: none;
  border: 1px solid var(--color-divider);
  color: var(--color-text);
  padding: 7px 11px;
  cursor: pointer;
  white-space: nowrap;
}
.cs__close:hover { border-color: var(--color-accent); color: var(--color-accent); }

.cs__body { padding: 36px clamp(20px, 4vw, 40px) 80px; }

.cs__article[hidden] { display: none; }

.cs__article h3 {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin-bottom: 30px;
  max-width: 22ch;
}
.cs__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  background: var(--color-divider);
  border: var(--rule) solid var(--color-divider);
  margin-bottom: 36px;
}
.cs__stat { background: var(--color-bg); padding: 18px 16px; }
.cs__stat b {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 24px;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.cs__stat span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-neutral-700);
}
.cs__article h4 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  margin-bottom: 10px;
}
.cs__article p {
  margin-bottom: 26px;
  max-width: 62ch;
  font-size: 16px;
}
.cs__article p.tight { margin-bottom: 16px; }
.cs__note {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-neutral-700);
  border-left: var(--rule) solid var(--color-divider);
  padding: 6px 0 6px 16px;
}
.cs__article .hr + h4 { margin-top: 26px; }
.cs__article > :last-child { margin-bottom: 0; color: var(--color-neutral-700); }

/* ── narrow screens ────────────────────────────────────────────────── */

@media (max-width: 640px) {
  /* The four anchors wrap the sticky header onto three rows on a phone and
     eat a third of the screen. The page is one linear read; drop them and
     keep the bar to a single row. */
  .site-nav { display: none; }
  .cs__stats { grid-template-columns: 1fr; }
  section[id], #top { scroll-margin-top: 64px; }

  .hero { padding-block: 56px 48px; }
  .section { padding-top: 56px; }
  .hero__aside {
    border-left: 0;
    border-top: var(--rule) solid var(--color-divider);
    padding-left: 0;
    padding-top: 22px;
    max-width: none;
  }
  .chapter__cue { margin-left: 0; text-align: left; }
  .timeline__row { grid-template-columns: 72px minmax(0, 1fr); gap: 14px; }
}