/* ==========================================================================
   Muhammad Hassan Raza — portfolio
   Design tokens and layout. Editorial sans, mono seasoning, one accent.
   ========================================================================== */

:root {
  --bg: #f7f7f5;
  --fg: #17171a;
  --muted: #70706e;
  --faint: #9b9b98;
  --line: #e2e2de;
  --card: #fdfdfc;
  --accent: oklch(0.47 0.12 250);
  --on-accent: #fff;

  --sans: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", "Menlo", monospace;

  --wrap: 1120px;
  --gutter: 32px;
  --section-y: clamp(56px, 8vw, 110px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #0e0e0e;
  --fg: #efefec;
  --muted: #9a9a95;
  --faint: #6e6e6a;
  --line: #242423;
  --card: #141414;
  --accent: oklch(0.74 0.11 250);
  --on-accent: #0e0e0e;
}

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

html {
  background: var(--bg);
  scroll-behavior: smooth;
  /* Sticky header shouldn't crop the section you just jumped to. */
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
    background-color 0.18s var(--ease);
}

a:hover {
  color: var(--fg);
}

h1,
h2,
h3 {
  font-weight: 500;
  text-wrap: pretty;
  margin: 0;
}

p {
  margin: 0;
}

img,
svg {
  display: block;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 12px 20px;
  background: var(--fg);
  color: var(--bg);
  font: 500 13px/1 var(--mono);
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* --- Header --------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

/* color-mix is well supported, but a hard fallback keeps the blur legible. */
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .site-header {
    background: var(--bg);
  }
}

.site-header__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  font: 500 13px/1 var(--mono);
  letter-spacing: 0.02em;
  color: var(--fg);
}

.wordmark span {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  font: 400 13px/1 var(--mono);
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--fg);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Moon invites dark mode; sun invites light. Show the one you'd switch to. */
.theme-toggle .icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

html[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* --- Sections ------------------------------------------------------------- */

.section {
  padding: var(--section-y) 0;
  border-top: 1px solid var(--line);
}

/* Mono label column + content column. */
.section--split {
  display: grid;
  grid-template-columns: minmax(0, 180px) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px);
}

.eyebrow {
  font: 400 12px/1 var(--mono);
  letter-spacing: 0.08em;
  color: var(--faint);
}

.section--split .eyebrow {
  margin-top: 6px;
}

.section__eyebrow {
  margin-bottom: clamp(28px, 4vw, 48px);
}

/* --- Buttons -------------------------------------------------------------- */

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg);
  font-size: 14px;
  font-weight: 500;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--primary {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
}

.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

/* An unfinished item, marked rather than faked. */
.btn--todo {
  border-style: dashed;
  color: var(--faint);
  font: 400 13px/1 var(--mono);
  cursor: default;
}

.todo {
  font: 400 11px/1 var(--mono);
  letter-spacing: 0.06em;
  color: var(--faint);
}

/* --- Hero ----------------------------------------------------------------- */

.hero {
  padding: clamp(80px, 13vw, 180px) 0 clamp(56px, 7vw, 96px);
}

.hero__eyebrow {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.hero__title {
  font-size: clamp(40px, 6.6vw, 86px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  max-width: 19ch;
}

.hero__title span {
  color: var(--accent);
}

.hero__sub {
  font-size: clamp(19px, 2.2vw, 28px);
  line-height: 1.45;
  color: var(--muted);
  margin-top: clamp(24px, 3vw, 34px);
  max-width: 30ch;
}

.hero__role {
  font: 400 13px/1.5 var(--mono);
  color: var(--faint);
  margin-top: 22px;
}

.hero .btn-row {
  margin-top: clamp(34px, 4.5vw, 52px);
}

/* --- Metrics -------------------------------------------------------------- */

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 32px;
  margin-top: clamp(56px, 8vw, 104px);
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.metric__value {
  font-weight: 400;
  font-size: clamp(34px, 4vw, 50px);
  letter-spacing: -0.03em;
  line-height: 1;
}

.metric__value sup {
  font-size: 0.45em;
  color: var(--muted);
  vertical-align: baseline;
  top: 0;
  margin-left: 4px;
}

.metric__value--accent {
  color: var(--accent);
}

.metric__label {
  font: 400 11px/1.4 var(--mono);
  letter-spacing: 0.06em;
  color: var(--faint);
  margin-top: 10px;
}

/* --- Hero marquee --------------------------------------------------------- */

.marquee-link {
  display: block;
  margin-top: clamp(40px, 5vw, 64px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.marquee-link__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.marquee-link__more {
  font: 400 11px/1 var(--mono);
  letter-spacing: 0.06em;
  color: var(--accent);
}

.marquee-link:hover .marquee-link__more {
  color: var(--fg);
}

/* Lives inside an <a>, so these are spans — they need explicit block/flex
   display or overflow, width and the edge mask are all ignored. */
.marquee {
  display: block;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, #000 9%, #000 91%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 9%, #000 91%, transparent);
}

.marquee__track {
  display: flex;
  width: max-content;
  animation: marquee 38s linear infinite;
}

/* The loop resets at -50%, so one group must be exactly half the track.
   Spacing rides on each group's trailing padding rather than a gap between
   them — a gap would make half-track land mid-space and the seam visibly jump. */
.marquee__group {
  display: flex;
  align-items: center;
  gap: 44px;
  padding-right: 44px;
  flex: none;
}

.marquee .ic {
  width: 22px;
  height: 22px;
}

.marquee__text {
  font: 500 14px/1 var(--mono);
  color: var(--muted);
  white-space: nowrap;
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* --- Work cards ----------------------------------------------------------- */

.card {
  display: grid;
  /* Pack rows at the top. Side-by-side cards stretch to equal height, and
     without this the shorter card's rows stretch too — turning its tag pills
     into tall ovals. */
  align-content: start;
  gap: 28px;
  padding: clamp(28px, 3.4vw, 44px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.card + .card,
.card-grid {
  margin-top: 20px;
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.card__title {
  font-size: clamp(24px, 3vw, 38px);
  letter-spacing: -0.025em;
  line-height: 1.12;
  max-width: 24ch;
}

.card__meta {
  font: 400 12px/1.4 var(--mono);
  color: var(--faint);
}

/* PROBLEM / DID / OUTCOME, three across on the flagship cards. */
.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 26px;
}

.fact__label {
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  color: var(--faint);
  margin-bottom: 8px;
}

.fact__body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--muted);
}

/* The outcome is the point of the card — hold it at full text colour. */
.fact--outcome .fact__body {
  color: var(--fg);
}

/* Explicitly 2-up, not auto-fit: at 1120px auto-fit packs a third column and
   leaves card 06 stranded on a row of its own. */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.card--compact {
  gap: 22px;
  padding: clamp(26px, 3vw, 36px);
}

.card--compact .card__title {
  font-size: clamp(22px, 2.4vw, 29px);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-top: 10px;
}

.card--compact .facts {
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.card--compact .fact__body {
  font-size: 15px;
}

/* --- Tech tags ------------------------------------------------------------ */

.tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 400 12px/1 var(--mono);
  color: var(--muted);
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.tag .ic {
  width: 13px;
  height: 13px;
}

/* --- Timeline ------------------------------------------------------------- */

.tl-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.tl-row:last-child {
  border-bottom: 0;
}

.tl-role {
  font-weight: 500;
  font-size: clamp(18px, 1.9vw, 22px);
  letter-spacing: -0.015em;
}

.tl-role span {
  color: var(--accent);
}

.tl-org {
  font-size: 15px;
  color: var(--muted);
  margin-top: 6px;
}

.tl-date {
  font: 400 12px/1.4 var(--mono);
  color: var(--faint);
  white-space: nowrap;
}

.tl-edu {
  font-weight: 400;
  font-size: 16px;
  color: var(--muted);
}

.tl-edu span {
  font: 400 12px/1.4 var(--mono);
  color: var(--faint);
}

/* --- Stack ---------------------------------------------------------------- */

.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(28px, 4vw, 52px);
}

.stack-group__title {
  font-weight: 500;
  font-size: 17px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.stack-list li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 400 13px/1 var(--mono);
  color: var(--muted);
}

.stack-list .ic {
  width: 14px;
  height: 14px;
}

ul.stack-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* --- Recognition ---------------------------------------------------------- */

.recognition {
  display: grid;
  gap: 14px;
}

.badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font: 500 13px/1 var(--mono);
  color: var(--fg);
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.badge .ic {
  width: 14px;
  height: 14px;
}

.cert {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.cert__name {
  font-size: 15px;
  font-weight: 400;
  color: var(--muted);
}

.cert__year {
  font: 400 12px/1.4 var(--mono);
  color: var(--faint);
}

/* --- Footer --------------------------------------------------------------- */

.site-footer {
  padding: var(--section-y) 0 clamp(48px, 6vw, 80px);
  border-top: 1px solid var(--line);
}

.footer__title {
  font-size: clamp(30px, 4.6vw, 60px);
  letter-spacing: -0.03em;
  line-height: 1.08;
  max-width: 22ch;
}

.site-footer .btn-row {
  margin: clamp(30px, 4vw, 44px) 0 clamp(48px, 7vw, 84px);
}

.colophon {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font: 400 12px/1.4 var(--mono);
  color: var(--faint);
}

/* --- Prose ---------------------------------------------------------------- */

.lede {
  font-size: clamp(20px, 2.1vw, 27px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  max-width: 62ch;
  text-wrap: pretty;
}

/* --- Reveal --------------------------------------------------------------- */

/* Hidden only once JS confirms it can reveal again — no-JS keeps everything visible. */
html.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

html.reveal-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* --- Responsive ----------------------------------------------------------- */

@media (max-width: 860px) {
  .site-nav {
    gap: 18px;
  }

  /* Section anchors stay reachable from the footer; drop the least-scanned link. */
  .site-nav a[href="#timeline"] {
    display: none;
  }
}

@media (max-width: 720px) {
  .card-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .section--split {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .section--split .eyebrow {
    margin-top: 0;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 24px;
  }

  .site-nav a[href="#stack"] {
    display: none;
  }

  .tl-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .card__head {
    gap: 10px;
  }

  /* Project number/client reads better above a wrapping title on narrow screens. */
  .card__head .card__meta {
    order: -1;
  }
}

@media (max-width: 400px) {
  .site-nav a[href="#work"] {
    display: none;
  }
}

/* --- Motion preferences --------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .marquee__track {
    animation: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}