/* ============================================================
   Andrea Maillard · Product Design & Experience Lead · Portfolio
   Swiss / International Typographic Style. Monochrome, grid-led.
   Self-contained. No external dependencies.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --paper: #FFFFFF;
  --surface: #F4F4F2;
  --surface-2: #FFFFFF;
  --ink: #0A0A0A;
  --ink-soft: #2E2E2E;
  --muted: #767676;
  --line: #E4E4E1;      /* subtle hairline */
  --rule: #0A0A0A;      /* strong rule */

  /* Single cool signal accent, used sparingly */
  --accent: #1B2AF0;
  --accent-deep: #0E1BBE;
  --accent-ink: #FFFFFF;

  --font-sans: "Helvetica Neue", Helvetica, "Arial Nova", Arial, "Segoe UI", Roboto, system-ui, sans-serif;
  --font-mono: "SF Mono", ui-monospace, "Cascadia Mono", "Menlo", "Consolas", monospace;

  --container: 1240px;
  --measure: 62ch;
  --radius: 0px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

:root[data-theme="dark"] {
  --paper: #0A0A0A;
  --surface: #141414;
  --surface-2: #101010;
  --ink: #F2F2F0;
  --ink-soft: #C9C9C6;
  --muted: #8A8A87;
  --line: #232323;
  --rule: #F2F2F0;
  --accent: #6E7BFF;
  --accent-deep: #939DFF;
  --accent-ink: #0A0A0A;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0A0A0A;
    --surface: #141414;
    --surface-2: #101010;
    --ink: #F2F2F0;
    --ink-soft: #C9C9C6;
    --muted: #8A8A87;
    --line: #232323;
    --rule: #F2F2F0;
    --accent: #6E7BFF;
    --accent-deep: #939DFF;
    --accent-ink: #0A0A0A;
  }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  font-size: clamp(1rem, 0.96rem + 0.15vw, 1.05rem);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--ink); color: var(--paper); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 0; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--ink);
}
.display { font-size: clamp(2.7rem, 1.2rem + 6.6vw, 6.2rem); line-height: 0.94; letter-spacing: -0.045em; font-weight: 800; }
h2 { font-size: clamp(1.8rem, 1.2rem + 2.6vw, 3.1rem); font-weight: 700; }
h3 { font-size: clamp(1.15rem, 1rem + 0.7vw, 1.5rem); font-weight: 700; letter-spacing: -0.02em; }
p { max-width: var(--measure); }

.mono, .eyebrow, .case-meta__k, .index__num, .next-case__label, .card__tag {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex; align-items: baseline; gap: 0.7em;
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink);
}
.eyebrow .idx { color: var(--accent); }

.lead { font-size: clamp(1.1rem, 0.95rem + 0.7vw, 1.35rem); color: var(--ink-soft); line-height: 1.45; font-weight: 400; letter-spacing: -0.01em; }
.muted { color: var(--muted); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }
.section { padding-block: clamp(3.5rem, 2.5rem + 5vw, 7rem); }
.section--tight { padding-block: clamp(2.25rem, 1.8rem + 2.5vw, 4rem); }
.ruled { border-top: 1px solid var(--rule); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(120%) blur(12px);
  -webkit-backdrop-filter: saturate(120%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 64px; }
.brand { font-weight: 700; font-size: 1.02rem; letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: 0.55rem; text-transform: uppercase; }
.brand__dot { width: 8px; height: 8px; border-radius: 0; background: var(--accent); flex: none; }
.nav__links { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2.2rem); }
.nav__links a { font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-soft); transition: color 0.2s var(--ease); }
.nav__links a:hover { color: var(--accent); }

.theme-toggle {
  appearance: none; border: 1px solid var(--line); background: transparent;
  color: var(--ink); width: 38px; height: 38px; border-radius: 0;
  display: grid; place-items: center; cursor: pointer; flex: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.theme-toggle:hover { border-color: var(--ink); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
@media (max-width: 620px) { .nav__links a:not(.nav__cta) { display: none; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.7em;
  font-family: var(--font-mono); font-weight: 500; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.95em 1.5em; border-radius: 0; cursor: pointer;
  border: 1px solid var(--ink); transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn .arrow { transition: transform 0.25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- Hero ---------- */
.hero { position: relative; padding-block: clamp(3rem, 2rem + 7vw, 7.5rem) clamp(2.5rem, 2rem + 3vw, 4.5rem); }
.hero__glow { display: none; }
.hero__available {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-soft); border: 1px solid var(--line); padding: 0.45em 0.9em; margin-bottom: 2rem;
}
.hero__available .pulse { width: 7px; height: 7px; border-radius: 0; background: var(--accent); }
.hero h1 { max-width: 16ch; }
.hero h1 .accent { color: var(--accent); font-style: normal; }
.hero__sub { margin-top: 1.8rem; max-width: 52ch; }
.hero__sub em { font-style: italic; }
.hero__actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* ---------- Impact strip ---------- */
.impact { border-block: 1px solid var(--rule); }
.impact__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.impact__cell { padding: clamp(1.6rem, 1rem + 2vw, 2.6rem) clamp(1rem, 1.5vw, 1.6rem) clamp(1.6rem, 1rem + 2vw, 2.6rem) 0; border-left: 1px solid var(--line); padding-left: clamp(1rem, 1.5vw, 1.6rem); }
.impact__cell:first-child { border-left: 0; padding-left: 0; }
.impact__num { font-weight: 800; font-size: clamp(2.4rem, 1.4rem + 3.4vw, 3.8rem); line-height: 0.95; color: var(--ink); letter-spacing: -0.04em; }
.impact__label { margin-top: 0.9rem; font-family: var(--font-mono); font-size: 0.76rem; line-height: 1.45; color: var(--muted); letter-spacing: 0.02em; }
@media (max-width: 720px) {
  .impact__grid { grid-template-columns: repeat(2, 1fr); }
  .impact__cell:nth-child(3) { border-left: 0; padding-left: 0; }
  .impact__cell:nth-child(1), .impact__cell:nth-child(2) { border-bottom: 1px solid var(--line); }
}

/* ---------- Section header ---------- */
.sec-head { margin-bottom: clamp(2rem, 1.5rem + 2vw, 3.5rem); }
.sec-head__text { max-width: 60ch; }
.sec-head h2 { margin-top: 1.2rem; }
.sec-head p { margin-top: 1.2rem; }

/* ---------- Work index list ---------- */
.index { list-style: none; border-top: 1px solid var(--rule); }
.index__row { border-bottom: 1px solid var(--line); }
.index__row a {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 0.9fr) 2rem;
  align-items: center; gap: 1.5rem;
  padding-block: clamp(1.3rem, 1rem + 1.2vw, 2.1rem);
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.index__row a:hover { color: var(--accent); padding-left: 0.6rem; }
.index__num { font-size: 0.85rem; color: var(--muted); }
.index__row a:hover .index__num { color: var(--accent); }
.index__title { font-weight: 700; font-size: clamp(1.25rem, 1rem + 1.4vw, 2rem); letter-spacing: -0.03em; }
.index__title .badge { font-family: var(--font-mono); font-size: 0.6em; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); vertical-align: middle; margin-left: 0.7em; border: 1px solid var(--accent); padding: 0.25em 0.5em; }
.index__cat { font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); letter-spacing: 0.02em; }
.index__metric { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 500; color: var(--ink); }
.index__arrow { justify-self: end; transition: transform 0.25s var(--ease); }
.index__row a:hover .index__arrow { transform: translateX(5px); }
@media (max-width: 820px) {
  .index__row a { grid-template-columns: 2rem 1fr auto; grid-template-areas: "num title arrow" "num cat metric"; gap: 0.3rem 1rem; }
  .index__num { grid-area: num; align-self: start; padding-top: 0.4rem; }
  .index__title { grid-area: title; }
  .index__cat { grid-area: cat; }
  .index__metric { grid-area: metric; justify-self: start; }
  .index__arrow { grid-area: arrow; align-self: start; padding-top: 0.4rem; }
}

/* ---------- About ---------- */
.about { border-top: 1px solid var(--rule); }
.about__grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(2rem, 1rem + 4vw, 4.5rem); align-items: start; }
.about__grid p + p { margin-top: 1.2rem; }
.about__grid p { color: var(--ink-soft); }
.about__stack { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: 0; border-top: 1px solid var(--line); }
.chip { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.03em; padding: 0.7em 0; color: var(--ink-soft); border-bottom: 1px solid var(--line); width: 50%; }
.chip::before { content: "· "; color: var(--accent); }
@media (max-width: 780px) { .about__grid { grid-template-columns: 1fr; } }

/* ---------- Leadership ---------- */
.lead-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); }
.lead-item { padding: clamp(1.6rem, 1.2rem + 1.5vw, 2.4rem) clamp(1.2rem, 1.5vw, 1.8rem) 0 0; border-left: 1px solid var(--line); padding-left: clamp(1.2rem, 1.5vw, 1.8rem); }
.lead-item:first-child { border-left: 0; padding-left: 0; }
.lead-item__idx { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); }
.lead-item h3 { margin-top: 1rem; }
.lead-item p { margin-top: 0.8rem; color: var(--ink-soft); font-size: 0.98rem; }
@media (max-width: 820px) {
  .lead-grid { grid-template-columns: 1fr; }
  .lead-item { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .lead-item:first-child { border-top: 0; }
}

/* ---------- Contact / CTA ---------- */
.cta { border-top: 1px solid var(--rule); }
.cta__box { padding-block: clamp(1rem, 0.5rem + 3vw, 3rem); }
.cta__box h2 { max-width: 16ch; }
.cta__box .lead { margin-top: 1.4rem; }
.cta__actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--rule); padding-block: 2.25rem; }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.2rem; }
.footer__socials { display: flex; gap: 0; }
.footer__socials a { width: 40px; height: 40px; display: grid; place-items: center; color: var(--ink-soft); border: 1px solid var(--line); border-left: 0; transition: color 0.2s var(--ease), background 0.2s var(--ease); }
.footer__socials a:first-child { border-left: 1px solid var(--line); }
.footer__socials a:hover { color: var(--paper); background: var(--ink); }
.footer__socials svg { width: 17px; height: 17px; }
.footer small { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.02em; color: var(--muted); }

/* ============================================================
   Case study pages
   ============================================================ */
.case-hero { padding-block: clamp(2rem, 1.5rem + 3vw, 4rem) clamp(2.5rem, 2rem + 3vw, 4.5rem); }
.back-link { display: inline-flex; align-items: center; gap: 0.5em; font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin-bottom: 2.5rem; transition: color 0.2s var(--ease), gap 0.2s var(--ease); }
.back-link:hover { color: var(--accent); gap: 0.8em; }
.case-hero h1 { max-width: 18ch; margin-top: 1.2rem; }
.case-hero .lead { margin-top: 1.6rem; }

.case-meta { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); margin-top: 2.8rem; }
.case-meta__item { padding: 1.3rem 1.4rem 1.3rem 0; border-left: 1px solid var(--line); padding-left: 1.4rem; }
.case-meta__item:first-child { border-left: 0; padding-left: 0; }
.case-meta__k { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.case-meta__v { margin-top: 0.5rem; font-weight: 700; color: var(--ink); font-size: 0.98rem; letter-spacing: -0.01em; }
@media (max-width: 720px) {
  .case-meta { grid-template-columns: repeat(2, 1fr); }
  .case-meta__item:nth-child(3) { border-left: 0; padding-left: 0; }
  .case-meta__item:nth-child(1), .case-meta__item:nth-child(2) { border-bottom: 1px solid var(--line); }
}

.case-banner { border: 1px solid var(--rule); position: relative; overflow: hidden; display: grid; place-items: center; aspect-ratio: 21 / 8; background: var(--surface); }
.case-banner__inner { position: relative; z-index: 1; text-align: center; padding: 2rem; max-width: 46ch; }
.case-banner__inner h2 { color: var(--ink); }
.case-banner__inner p { color: var(--muted); margin-top: 0.7rem; font-family: var(--font-mono); font-size: 0.85rem; }
/* Monochrome banner variants, differentiated by a hairline grid motif only */
.bn-uma, .bn-rapidmail, .bn-instamotion, .bn-hotel {
  background-image: repeating-linear-gradient(90deg, var(--line) 0, var(--line) 1px, transparent 1px, transparent 56px);
}
:root[data-theme="dark"] .bn-uma, :root[data-theme="dark"] .bn-rapidmail,
:root[data-theme="dark"] .bn-instamotion, :root[data-theme="dark"] .bn-hotel { background-color: var(--surface); }

.prose { max-width: 760px; }
.prose .block { padding-block: clamp(2rem, 1.5rem + 2vw, 3.2rem); border-bottom: 1px solid var(--line); }
.prose .block:last-child { border-bottom: 0; }
.prose h2 { font-size: clamp(1.4rem, 1.1rem + 1.5vw, 2rem); display: flex; align-items: baseline; gap: 0.8rem; }
.prose h2 .step { font-family: var(--font-mono); color: var(--accent); font-size: 0.55em; font-weight: 500; letter-spacing: 0.04em; }
.prose p { margin-top: 1.1rem; color: var(--ink-soft); }
.prose p + p { margin-top: 1.1rem; }
.prose ul { margin-top: 1.2rem; padding-left: 0; list-style: none; display: grid; gap: 0.8rem; }
.prose li { position: relative; padding-left: 1.8rem; color: var(--ink-soft); }
.prose li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 9px; height: 1.5px; background: var(--accent); }
.prose strong { color: var(--ink); font-weight: 700; }

.result-cards { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); margin-top: 1.8rem; }
.result-card { padding: 1.6rem 1.2rem 1.6rem 0; border-left: 1px solid var(--line); padding-left: 1.2rem; }
.result-card:first-child { border-left: 0; padding-left: 0; }
.result-card__num { font-weight: 800; font-size: clamp(1.9rem, 1.4rem + 2vw, 2.8rem); color: var(--ink); line-height: 0.95; letter-spacing: -0.04em; }
.result-card__label { margin-top: 0.7rem; font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted); line-height: 1.4; }
@media (max-width: 640px) { .result-cards { grid-template-columns: 1fr; } .result-card { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 1.2rem; } .result-card:first-child { border-top: 0; } }

.pull { font-size: clamp(1.4rem, 1.1rem + 1.6vw, 2.1rem); line-height: 1.2; font-weight: 700; letter-spacing: -0.03em; color: var(--ink); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 1.8rem 0; margin: 2.2rem 0; font-style: normal; }
.pull::before { content: "“"; color: var(--accent); }

.next-case { border-top: 1px solid var(--rule); }
.next-case a { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: clamp(2rem, 1.5rem + 2vw, 3rem); transition: padding-left 0.25s var(--ease); }
.next-case a:hover { padding-left: 0.6rem; }
.next-case__label { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.next-case__title { font-weight: 700; font-size: clamp(1.4rem, 1.1rem + 2vw, 2.3rem); margin-top: 0.5rem; letter-spacing: -0.03em; transition: color 0.2s var(--ease); }
.next-case a:hover .next-case__title { color: var(--accent); }
.next-case .arrow-lg { width: 36px; height: 36px; flex: none; color: var(--ink); transition: transform 0.25s var(--ease), color 0.2s var(--ease); }
.next-case a:hover .arrow-lg { transform: translateX(6px); color: var(--accent); }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* Skip link */
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.7em 1.2em; z-index: 100; }
.skip:focus { left: 0; }