/* ============================================================
   V3 SITE CHROME — shared by the V3 (Quiet) sub-pages
   (about + case studies inside homepage-testing/).

   Load order matters:
     ../tokens.css  →  [../case-study.css]  →  this file
   This file overrides the old skin: Geist, uppercase quiet UI,
   sharp corners, grain. Page-specific layout stays inline in
   each page, same as the homepage versions themselves.
============================================================ */

/* ── Tokens: V3 overrides ── */
body {
  --font-body: 'Geist', sans-serif;
  --font-display: 'Geist', sans-serif;
  /* sharp corners everywhere — no border-radius in the system */
  --radius-sm: 0; --radius-md: 0; --radius-lg: 0; --radius-xl: 0;
}

/* ── Reset / base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: clamp(15px, 1vw, 16px);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.4s var(--ease-out), color 0.4s var(--ease-out);
  min-height: 100vh;
  overflow-x: hidden;
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
}
p { line-height: 1.65; }
a { color: inherit; }
::selection { background: var(--color-ink); color: var(--color-bg); }

/* Grain texture — same fixed overlay as the V3 homepage */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  mix-blend-mode: overlay;
}

/* ── Layout ── */
.page {
  position: relative;
  z-index: 1;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(48px, 8vh, 96px);
}

/* ── Shared bits ── */
.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  display: inline-block;
  flex-shrink: 0;
}
.rule, .divider {
  border: none;
  border-top: 0.5px solid var(--color-line);
  margin: 0;
}

/* Section label — V3 voice */
.section-label {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-mute);
  font-weight: 500;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-mute);
  font-weight: 500;
}

/* Category chips — same colours as the homepage cards */
.chip {
  display: inline-block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 8px;
}
.chip--cs   { background: #f5d90a; color: #111; }
.chip--edu  { background: #1e3aff; color: #fff; }
.chip--work { background: #16e34f; color: #111; }

/* Solid ink button — the V3 "See projects" pattern */
.btn-ink {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  background: var(--color-ink);
  border: 0.5px solid var(--color-ink);
  color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.btn-ink:hover {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn-ink svg {
  width: 14px; height: 14px;
  stroke: currentColor; fill: none;
  stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal[data-delay="1"] { transition-delay: 80ms; }
.reveal[data-delay="2"] { transition-delay: 160ms; }
.reveal[data-delay="3"] { transition-delay: 240ms; }
.reveal[data-delay="4"] { transition-delay: 320ms; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============================================================
   HEADER — the V3 corners, adapted to a scrolling page
============================================================ */
.site-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: clamp(20px, 3vh, 32px) 0 0;
}
.wordmark {
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 34px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  text-transform: uppercase;
  color: var(--color-ink);
  text-decoration: none;
}
.top-right {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 4px;
  color: var(--color-mute);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  list-style: none;
}
.nav-links a {
  color: var(--color-mute);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.is-current { color: var(--color-ink); }

/* Theme toggle: segmented sun / moon, current mode filled (copied from V3) */
.theme-toggle {
  position: relative;
  z-index: 60; /* stays reachable above the open mobile menu panel */
  overflow: hidden;
  display: inline-flex;
  align-items: stretch;
  padding: 0;
  border: 0.5px solid var(--color-line);
  background: none;
  color: var(--color-mute);
  cursor: pointer;
  line-height: 0;
  transition: border-color 0.3s ease;
}
.theme-toggle:hover { border-color: var(--color-ink); }
.tt-thumb {
  position: absolute;
  top: 0; left: 0;
  width: 50%; height: 100%;
  background: var(--color-ink);
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.4s ease;
}
body.dark .tt-thumb { transform: translateX(100%); }
.tt-cell {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 27px;
  height: 22px;
  color: var(--color-mute);
  transition: color 0.35s ease;
}
.tt-cell svg {
  width: 13px; height: 13px;
  stroke: currentColor; fill: none;
  stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}
body:not(.dark) .tt-cell[data-mode="light"],
body.dark .tt-cell[data-mode="dark"] { color: var(--color-bg); }
body.dark .tt-cell[data-mode="light"] svg { transform: rotate(-70deg) scale(0.88); }
body:not(.dark) .tt-cell[data-mode="dark"] svg { transform: rotate(30deg) scale(0.88); }

/* Hamburger — desktop hides it, mobile shows it */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 22px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 60;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-ink);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.25s;
}
body.nav-open .nav-toggle span:first-child { transform: translateY(3.25px) rotate(45deg); }
body.nav-open .nav-toggle span:last-child  { transform: translateY(-3.25px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    inset: 0;
    z-index: 50;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 4px;
    padding: 0 clamp(20px, 6vw, 48px);
    background: var(--color-bg);
    font-size: clamp(28px, 7vw, 44px);
    font-weight: 500;
    letter-spacing: -0.03em;
    text-transform: none;
    color: var(--color-ink);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), visibility 0s 0.35s;
  }
  body.nav-open .nav-links {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), visibility 0s;
  }
  .nav-links a { color: inherit; }
}

/* ── Footer — same as the V3 homepage ── */
footer.site-foot {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--color-mute);
  padding: clamp(16px, 2.5vw, 24px) clamp(20px, 4vw, 56px);
  border-top: 0.5px solid var(--color-line);
  margin-top: 48px;
}

/* ============================================================
   CASE-STUDY RESKIN — overrides on top of ../case-study.css
============================================================ */

/* type: Geist carries less weight than Inter Tight did */
.cs-title { font-weight: 600; letter-spacing: -0.035em; }
.cs-section-title { font-weight: 500; letter-spacing: -0.03em; }
.cs-sub-block-title { font-weight: 500; }
.cs-accordion-title { font-weight: 500; }
.cs-meta-label { letter-spacing: 0.08em; }
.cs-goals-label { font-weight: 600; letter-spacing: 0.08em; }
.cs-strip-label { font-weight: 500; letter-spacing: 0.08em; }
.cs-num { font-weight: 500; }
.cs-quote p { letter-spacing: -0.02em; }
.toc-item.active a { font-weight: 600; }

/* hero kicker: chip + year instead of a plain label */
.cs-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
}
.cs-kicker .cs-kicker-year {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-mute);
  font-weight: 500;
}

/* TOC in the quiet uppercase voice */
.toc-item a {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-quiet);
}
.toc-item a:hover { color: var(--color-mute); }
.toc-item.active a { color: var(--color-ink); }

/* sharp corners */
.cs-hero-img,
.cs-figure-img,
.cs-img-cell,
.cs-strip-img,
.cs-accordion,
.cs-carousel,
.cs-image-placeholder,
.cs-preview-placeholder { border-radius: 0; }

/* prototype button becomes the ink button */
.cs-proto-btn {
  background: var(--color-ink);
  border: 0.5px solid var(--color-ink);
  color: var(--color-bg);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 10px 16px;
  border-radius: 0;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.cs-proto-btn:hover {
  opacity: 1;
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}

/* footer nav in the uppercase voice */
.cs-footer-back, .cs-footer-next {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-mute);
}
.cs-footer-back:hover, .cs-footer-next:hover { color: var(--color-ink); }

/* ============================================================
   DESIGN VIEWER RESKIN — overrides on top of ../viewer.css
   (phone chassis keeps its rounding — it's hardware, not UI)
============================================================ */
.design-viewer .dv-stage { border-radius: 0; }
.design-viewer .dv-group,
.design-viewer .dv-group::before,
.design-viewer .dv-btn::before,
.design-viewer .dv-mode-toggle,
.design-viewer .dv-arrow,
.design-viewer .dv-fs-btn,
.design-viewer .dv-callout,
.design-viewer .dv-callout-num { border-radius: 0; }

.design-viewer .dv-group {
  background: var(--color-bg-2);
  border-color: var(--color-line);
}
.design-viewer .dv-group::before { background: var(--color-ink); }
.design-viewer .dv-btn {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-mute);
}
.design-viewer .dv-btn:not(.is-active):hover { color: var(--color-ink); }
.design-viewer .dv-btn::before { background: var(--color-line); }
.design-viewer .dv-btn.is-active { color: var(--color-bg); }
.design-viewer .dv-mode-toggle {
  background: var(--color-bg-2);
  border-color: var(--color-line);
  color: var(--color-ink);
}
.design-viewer .dv-mode-toggle:hover { background: var(--color-line); }
/* callout number badge takes the case-study yellow */
.design-viewer .dv-callout-num { background: #f5d90a; color: #111; }

/* ============================================================
   THEME WIPE — the new theme reveals as a circle from the toggle.
   The clip-path animation is driven from JS (toggleTheme); here we
   only disable the default cross-fade and the underlying CSS fades.
============================================================ */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}
/* returning to light: the dark (old) snapshot collapses back into the
   toggle, so it must sit ABOVE the incoming light view while it shrinks */
html.theme-wipe--out::view-transition-old(root) { z-index: 1; }
html.theme-wipe *,
html.theme-wipe *::before,
html.theme-wipe *::after {
  transition: none !important;
}