/* ============================================================
   sahila.design — Design Tokens (locked system, SD file)
   ============================================================ */
:root {
  /* Color */
  --color-bg: #F9F8F6;
  --color-ink: #121212;
  --color-secondary: #595959;
  --color-tertiary: #6B6B6B;      /* AA on bg: 4.66:1 */
  --color-accent: #2B63D9;        /* Reenie Beanie only */
  --color-line: rgba(18, 18, 18, 0.12);
  --color-scrim: rgba(0, 0, 0, 0.35);

  /* Type — DM Sans Light 300 / Regular 400 / SemiBold 600 / Black 900 */
  --font-ui: "DM Sans", system-ui, sans-serif;
  --font-hand: "Reenie Beanie", cursive; /* hero only, never below 80px */

  --size-hero-display: clamp(3.25rem, 8.5vw, 6.25rem);   /* 52 → 100px */
  --size-hero-accent: clamp(5rem, 12vw, 8.75rem);        /* 80 → 140px, floor locked */
  --size-case-title: clamp(2.5rem, 6vw, 4rem);           /* 40 → 64px */
  --size-h2: clamp(1.75rem, 3.5vw, 2.25rem);             /* 28 → 36px */
  --size-lede: clamp(1.25rem, 2.5vw, 1.75rem);           /* 20 → 28px */
  --size-body: 1rem;                                     /* 16px */
  --size-small: 0.8125rem;                               /* 13px — system minimum */

  /* Layout */
  --margin-page: clamp(1.5rem, 4.5vw, 4rem);             /* 24 → 64px */
  --width-text: 42rem;                                   /* 672px reading column */
  --width-max: 78rem;
}

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

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-ui);
  font-weight: 400;
  font-size: var(--size-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

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

.skip-link {
  position: absolute;
  left: var(--margin-page);
  top: -3rem;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 0.5rem 1rem;
  text-decoration: none;
  font-size: var(--size-small);
  z-index: 100;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 0.75rem; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.75rem var(--margin-page);
}
.site-header .brand {
  font-weight: 600;                 /* SemiBold — audited fix */
  font-size: 1.125rem;              /* 18px */
  text-decoration: none;
  letter-spacing: 0.01em;
}
.site-header .disciplines {
  font-size: var(--size-small);
  color: var(--color-tertiary);
  letter-spacing: 0.02em;
}
@media (max-width: 40rem) {
  .site-header .disciplines { display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: clamp(3rem, 10vh, 7rem) var(--margin-page) 2rem;
  max-width: var(--width-max);
}
.hero h1 {
  margin: 0;
  font-weight: 900;                 /* DM Sans Black */
  font-size: var(--size-hero-display);
  line-height: 1.04;
  letter-spacing: -0.015em;
}
.hero .hand {
  display: block;
  font-family: var(--font-hand);
  font-weight: 400;
  font-size: var(--size-hero-accent);
  color: var(--color-accent);
  line-height: 0.9;
  margin-left: clamp(1.5rem, 8vw, 7rem);   /* the ink indent */
  letter-spacing: 0;
}
.hero .kicker {
  margin: 2rem 0 0;
  max-width: 34rem;
  font-weight: 300;
  color: var(--color-secondary);
}

/* ============================================================
   View toggle — canvas / linear
   ============================================================ */
.view-toggle {
  display: flex;
  gap: 0;
  margin: 2.5rem var(--margin-page) 0;
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  width: fit-content;
  overflow: hidden;
}
.view-toggle button {
  font: inherit;
  font-size: var(--size-small);
  font-weight: 400;
  padding: 0.55rem 1.25rem;
  border: 0;
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
}
.view-toggle button[aria-pressed="true"] {
  background: var(--color-ink);
  color: var(--color-bg);
  font-weight: 600;
}

/* ============================================================
   Canvas view — the signature
   ============================================================ */
.canvas-section { margin-top: 1.5rem; }

.canvas-viewport {
  position: relative;
  height: min(78vh, 46rem);
  margin: 0 var(--margin-page);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
  background:
    radial-gradient(circle at center, rgba(18,18,18,0.035) 1px, transparent 1px);
  background-size: 28px 28px;
}
.canvas-viewport.dragging { cursor: grabbing; }

.canvas-world {
  position: absolute;
  left: 0; top: 0;
  width: 1600px; height: 1000px;
  transform-origin: 0 0;
  will-change: transform;
}

.canvas-links {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.canvas-links line {
  stroke: var(--color-line);
  stroke-width: 1.5;
}

.node {
  position: absolute;
  transform: translate(-50%, -50%);
  text-decoration: none;
  text-align: center;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  transition: background 0.15s ease;
}
.node:hover, .node:focus-visible { background: rgba(18,18,18,0.045); }

.node .node-title {
  display: block;
  font-weight: 400;
  font-size: 0.875rem;              /* 14px */
  color: var(--color-ink);
  white-space: nowrap;
}
.node .node-tag {
  display: block;
  margin-top: 0.2rem;
  font-weight: 300;
  font-size: var(--size-small);
  color: var(--color-tertiary);
  white-space: nowrap;
}
.node.is-live .node-tag { color: var(--color-secondary); }

.node-anchor {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-ink);
  pointer-events: none;
}

.canvas-controls {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  gap: 0.5rem;
}
.canvas-controls button {
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  width: 2.5rem; height: 2.5rem;    /* 40px touch target */
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-ink);
  cursor: pointer;
}
.canvas-controls button:hover { background: var(--color-ink); color: var(--color-bg); }

.canvas-hint {
  margin: 0.75rem var(--margin-page) 0;
  font-size: var(--size-small);
  color: var(--color-tertiary);
}

/* ============================================================
   Linear view — the accessible mode
   ============================================================ */
.linear-section {
  margin: 1.5rem var(--margin-page) 0;
  max-width: var(--width-max);
}
.linear-list {
  list-style: none;
  margin: 0; padding: 0;
}
.linear-list li {
  border-top: 1px solid var(--color-line);
}
.linear-list li:last-child { border-bottom: 1px solid var(--color-line); }

.linear-item {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.75rem 0.25rem;
  text-decoration: none;
  transition: background 0.15s ease;
}
.linear-item:hover, .linear-item:focus-visible { background: rgba(18,18,18,0.03); }

.linear-item .index {
  font-size: var(--size-small);
  color: var(--color-tertiary);
  font-variant-numeric: tabular-nums;
}
.linear-item h3 {
  margin: 0;
  font-weight: 600;
  font-size: clamp(1.375rem, 3vw, 2rem);
  line-height: 1.2;
}
.linear-item .tag {
  font-size: var(--size-small);
  font-weight: 300;
  color: var(--color-secondary);
  white-space: nowrap;
}
@media (max-width: 40rem) {
  .linear-item { grid-template-columns: 2.25rem 1fr; }
  .linear-item .tag { grid-column: 2; }
}

/* ============================================================
   About & contact
   ============================================================ */
.about, .contact {
  padding: clamp(4rem, 12vh, 8rem) var(--margin-page) 0;
  max-width: var(--width-text);
}
.about h2, .contact h2 {
  font-weight: 600;
  font-size: var(--size-h2);
  line-height: 1.15;
  margin: 0 0 1.5rem;
}
.about p, .contact p {
  font-weight: 300;
  color: var(--color-secondary);
  margin: 0 0 1.25rem;
}
.about p strong { font-weight: 600; color: var(--color-ink); }

.contact .mail {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  font-size: var(--size-lede);
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--color-ink);
  padding-bottom: 0.1em;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(4rem, 12vh, 8rem);
  padding: 2rem var(--margin-page) 2.5rem;
  border-top: 1px solid var(--color-line);
  font-size: var(--size-small);
  color: var(--color-tertiary);
}
.site-footer a { color: var(--color-secondary); }

/* ============================================================
   Case study pages
   ============================================================ */
.case-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1.25rem var(--margin-page);
  background: var(--color-scrim);
  color: #fff;
  backdrop-filter: blur(6px);
}
.case-nav a {
  color: #fff;
  text-decoration: none;
  font-size: 0.875rem;
}
.case-nav a:hover { text-decoration: underline; }
.case-nav .brand { font-weight: 600; font-size: 1rem; }
.case-nav :focus-visible { outline-color: #fff; }

.case-hero {
  margin: 0;
  height: min(72vh, 44rem);
  display: flex;
  align-items: flex-end;
  position: relative;
  overflow: hidden;
}
.case-hero .placeholder {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(160deg, rgba(18,18,18,0.06), rgba(18,18,18,0.02)),
    radial-gradient(circle at 30% 40%, rgba(43,99,217,0.08), transparent 60%);
}
.case-hero figcaption {
  position: relative;
  padding: 0 var(--margin-page) 3rem;
  max-width: var(--width-max);
}
.case-hero h1 {
  margin: 0;
  font-weight: 900;
  font-size: var(--size-case-title);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.case-hero .status {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: var(--size-small);
  font-weight: 600;
  color: var(--color-ink);
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding: 2rem var(--margin-page);
  border-bottom: 1px solid var(--color-line);
  max-width: var(--width-max);
  margin: 0;
}
.case-meta div { margin: 0; }
.case-meta dt {
  font-size: var(--size-small);
  color: var(--color-tertiary);
  margin-bottom: 0.15rem;
}
.case-meta dd {
  margin: 0;
  font-size: var(--size-small);
  font-weight: 600;
}

.case-body {
  padding: clamp(3rem, 8vh, 5.5rem) var(--margin-page) 0;
  max-width: var(--width-text);
}
/* Option B — type hierarchy instead of uppercase labels */
.case-body h2 {
  font-weight: 600;
  font-size: var(--size-h2);
  line-height: 1.15;
  margin: 0 0 1.25rem;
}
.case-body .lede {
  font-size: var(--size-lede);
  font-weight: 300;
  line-height: 1.4;
  color: var(--color-ink);
  margin: 0 0 2rem;
}
.case-body p {
  font-weight: 300;
  color: var(--color-secondary);
  margin: 0 0 1.25rem;
}
.case-body section { margin-bottom: clamp(3rem, 8vh, 5rem); }

.case-figure {
  margin: clamp(3rem, 8vh, 5rem) 0;
}
.case-figure .placeholder {
  aspect-ratio: 16 / 9;
  border: 1px dashed var(--color-line);
  border-radius: 6px;
  background: rgba(18,18,18,0.02);
  display: grid;
  place-items: center;
  color: var(--color-tertiary);
  font-size: var(--size-small);
}
.case-figure figcaption {
  margin-top: 0.6rem;
  font-size: var(--size-small);
  color: var(--color-tertiary);
}

.case-next {
  margin-top: clamp(4rem, 10vh, 7rem);
  padding: 2.5rem var(--margin-page) 3rem;
  border-top: 1px solid var(--color-line);
}
.case-next a {
  text-decoration: none;
  font-weight: 600;
  font-size: var(--size-lede);
}
.case-next .label {
  display: block;
  font-size: var(--size-small);
  font-weight: 400;
  color: var(--color-tertiary);
  margin-bottom: 0.35rem;
}

/* ============================================================
   Zoom-in case layer — content expands from the node position
   ============================================================ */
.case-layer {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: var(--color-bg);
  transform-origin: 0 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.case-layer.animating {
  transition:
    transform 0.42s cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 0.3s ease;
}
.case-layer-bar {
  flex: none;
  padding: 1rem var(--margin-page);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-bg);
}
.case-layer-bar button {
  font: inherit;
  font-size: var(--size-small);
  font-weight: 600;
  border: 0;
  background: none;
  color: var(--color-ink);
  cursor: pointer;
  padding: 0.5rem 0.5rem 0.5rem 0;
}
.case-layer-content {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
}
/* Inside the layer, the sticky case-nav of standalone pages is redundant */
.case-layer-content .case-nav { display: none; }

.canvas-world.diving {
  transition:
    transform 0.42s cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 0.32s ease;
}


/* ============================================================
   Placeholder art (generated SVG, replaced by real material later)
   ============================================================ */
.case-hero .art { position: absolute; inset: 0; }
.case-hero .art svg { width: 100%; height: 100%; display: block; }
.case-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 45%;
  background: linear-gradient(transparent, rgba(249, 248, 246, 0.92));
  pointer-events: none;
}
.case-hero figcaption { z-index: 1; }
.case-figure .art {
  border: 1px solid var(--color-line);
  border-radius: 6px;
  overflow: hidden;
}
.case-figure .art svg { width: 100%; height: auto; display: block; }