/* ============================================================
   D/4 studio — holding site.
   Broadsheet (light) theme. Token values are pulled verbatim from
   the d/dx ground-truth tokens (src/styles/tokens.css, .theme-broadsheet)
   so the studio site and the d/dx site read as a deliberate pair.
   Self-hosted fonts, served from this site's own /assets/fonts/.
   ============================================================ */

/* ---------- Fonts (self-hosted) ---------- */
@font-face {
  font-family: 'Clash Display';
  src: url('/assets/fonts/ClashDisplay-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Display';
  src: url('/assets/fonts/ClashDisplay-Medium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Display';
  src: url('/assets/fonts/ClashDisplay-Semibold.woff2') format('woff2');
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Display';
  src: url('/assets/fonts/ClashDisplay-Bold.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Grotesk';
  src: url('/assets/fonts/ClashGrotesk-Light.woff2') format('woff2');
  font-weight: 300;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Grotesk';
  src: url('/assets/fonts/ClashGrotesk-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Grotesk';
  src: url('/assets/fonts/ClashGrotesk-Medium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'Clash Grotesk';
  src: url('/assets/fonts/ClashGrotesk-Semibold.woff2') format('woff2');
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/assets/fonts/jetbrains-mono-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/assets/fonts/jetbrains-mono-500.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}

/* ---------- Broadsheet theme tokens (verbatim from tokens.css) ---------- */
:root {
  --bg-canvas: #F7F5F0;
  --bg-surface: #FFFFFF;
  --bg-sunken: #EFECE5;
  --bg-inverse: #0E0F10;

  --fg-primary: #0E0F10;
  --fg-secondary: #5E5D58;
  --fg-tertiary: #8B8A85;

  --border-subtle: #E9E6DF;
  --border-default: #D6D3CC;
  --border-strong: #0E0F10;

  --accent: #2DA7FF;
  --accent-subtle: #DCEEFD;

  --dot-color: rgba(14, 15, 16, 0.08);

  --font-display: 'Clash Display', system-ui, sans-serif;
  --font-body: 'Clash Grotesk', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Motion (house values) */
  --dur-fast: 200ms;
  --dur-base: 400ms;
  --dur-slow: 600ms;
  --ease-brand: cubic-bezier(0.22, 1, 0.36, 1);

  /* Dot grid */
  --dot-cell: 15px;

  /* Layout */
  --max-w: 1280px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

/* ---------- Reset-ish base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg-canvas);
  color: var(--fg-primary);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Lenis smooth-scroll: html gets these only when JS activates it. */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: clip; }

a { color: inherit; }

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

/* ---------- Focus & a11y ---------- */
:focus-visible {
  outline: 2px solid var(--border-strong);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--fg-primary);
  color: var(--bg-canvas);
  padding: 0.625rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

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

/* ---------- Shared utilities ---------- */

/* The exact app dot-grid (15px cell, 0.7px dot). */
.dot-grid {
  background-image: radial-gradient(circle at center, var(--dot-color) 0.7px, transparent 1.2px);
  background-size: var(--dot-cell) var(--dot-cell);
}

.shell {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-tertiary);
}

/* ---------- Site header / nav ---------- */
.site-header {
  position: relative;
  z-index: 20;
}
.site-header .shell {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-block: clamp(1.25rem, 3vw, 1.75rem);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--fg-primary);
  text-decoration: none;
  line-height: 1;
}
.wordmark--nav { font-size: 1.25rem; }
.wordmark .slash { font-weight: 600; }

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-primary);
  text-decoration: none;
  padding: 0.35rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-brand),
              color var(--dur-fast) var(--ease-brand);
}
.nav-link:hover { border-color: var(--border-strong); }
.nav-link .arrow {
  display: inline-block;
  transition: transform var(--dur-fast) var(--ease-brand);
}
.nav-link:hover .arrow { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: clip;
}
.hero .shell {
  position: relative;
  z-index: 2;
  min-height: clamp(30rem, 78vh, 52rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: clamp(3rem, 8vh, 6rem);
}

.hero-kicker {
  margin: 0 0 clamp(1.75rem, 4vh, 2.75rem);
}

.hero-mark {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.9;
  font-size: clamp(5rem, 22vw, 16rem);
  margin: 0 0 clamp(1.5rem, 4vh, 2.5rem);
  color: var(--fg-primary);
}
.hero-mark .slash {
  /* The core glyph — native angle & weight, kissing its neighbours. */
  margin: 0 -0.02em;
}

.hero-lede {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(1.5rem, 3.6vw, 3rem);
  max-width: 20ch;
  margin: 0;
  color: var(--fg-primary);
  text-wrap: balance;
}

/* Line-mask reveal primitive: overflow-clip wrapper + rising inner line.
   Lines don't wrap internally, so the chosen splits hold at every width and
   the compound "data driven" never breaks across a line. */
.line-clip {
  display: block;
  overflow: hidden;
  padding-block: 0.04em; /* room for descenders inside the clip */
  white-space: nowrap;
}
.line-inner { display: block; will-change: transform; }
.hero-lede .nb { white-space: nowrap; } /* belt-and-braces guard on "data driven" */

/* ---------- The giant "/" dot motif ---------- */
.slash-motif {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: clamp(-10rem, -6vw, -3rem);
  transform: translateY(-50%);
  width: clamp(26rem, 52vw, 60rem);
  height: clamp(34rem, 92vh, 62rem);
  pointer-events: none;
  /* dense dots clipped into a slash parallelogram */
  --dot-color: rgba(14, 15, 16, 0.16);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 140' preserveAspectRatio='xMidYMid meet'%3E%3Cpath d='M66 0 L100 0 L34 140 L0 140 Z' fill='%23000'/%3E%3C/svg%3E");
          mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 140' preserveAspectRatio='xMidYMid meet'%3E%3Cpath d='M66 0 L100 0 L34 140 L0 140 Z' fill='%23000'/%3E%3C/svg%3E");
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
  -webkit-mask-size: contain;
          mask-size: contain;
  -webkit-mask-position: center;
          mask-position: center;
}
/* The dot layer itself lives in a child so we can drive parallax on it
   without disturbing the mask. */
.slash-motif__dots {
  position: absolute;
  inset: -8% 0;
  background-image: radial-gradient(circle at center, var(--dot-color) 0.7px, transparent 1.2px);
  background-size: var(--dot-cell) var(--dot-cell);
  will-change: transform;
}

@media (max-width: 720px) {
  .slash-motif {
    right: -18%;
    width: 80vw;
    opacity: 0.65;
  }
}

/* ---------- Second section ---------- */
.register {
  border-top: 1px solid var(--border-subtle);
}
.register .shell {
  padding-block: clamp(4rem, 12vh, 9rem);
  display: grid;
  gap: clamp(2.5rem, 6vh, 4rem);
}
.register-line {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.16;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  max-width: 24ch;
  margin: 0;
  color: var(--fg-primary);
  text-wrap: balance;
}
.register-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 3rem;
  align-items: baseline;
}
.meta-item { display: grid; gap: 0.5rem; }
.meta-item .label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-tertiary);
}
.meta-item .value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--fg-primary);
  text-decoration: none;
  width: fit-content;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-brand);
}
a.value:hover { border-color: var(--border-strong); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
}
.site-footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  padding-block: clamp(2rem, 5vh, 3rem);
}
.site-footer .wordmark { font-size: 1.125rem; }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

/* ============================================================
   Motion — reveals are ENHANCEMENT ONLY.
   Content is fully visible by default (no-JS, reduced-motion, SEO).
   The inline head script adds html.js-motion before paint *only*
   when motion is allowed; these rules hide/animate solely under it.
   ============================================================ */
.js-motion [data-reveal] .line-inner { transform: translateY(110%); }
.js-motion [data-reveal].is-in .line-inner {
  transform: translateY(0);
  transition: transform var(--dur-slow) var(--ease-brand);
}

/* Fade-rise for simple blocks (kicker, meta, footer bits). */
.js-motion [data-rise] {
  opacity: 0;
  transform: translateY(12px);
}
.js-motion [data-rise].is-in {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur-base) var(--ease-brand),
              transform var(--dur-base) var(--ease-brand);
}

/* The slash motif is the only element allowed to "perform":
   it draws in last, rising into its mask. */
.js-motion .slash-motif { overflow: hidden; }
.js-motion .slash-motif__dots { transform: translateY(112%); }
.js-motion .slash-motif.is-in .slash-motif__dots {
  transform: translateY(var(--parallax, 0px));
  transition: transform var(--dur-slow) var(--ease-brand);
}

/* Staggered delays for the hero lede lines + motif last. */
.js-motion [data-reveal][data-i="0"].is-in .line-inner { transition-delay: 0ms; }
.js-motion [data-reveal][data-i="1"].is-in .line-inner { transition-delay: 80ms; }
.js-motion [data-reveal][data-i="2"].is-in .line-inner { transition-delay: 160ms; }
.js-motion [data-reveal][data-i="3"].is-in .line-inner { transition-delay: 240ms; }
.js-motion [data-reveal][data-i="4"].is-in .line-inner { transition-delay: 320ms; }
.js-motion .hero .slash-motif.is-in .slash-motif__dots { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  .js-motion [data-reveal] .line-inner,
  .js-motion [data-rise],
  .js-motion .slash-motif__dots {
    transform: none !important;
    opacity: 1 !important;
    transition: none !important;
  }
  .nav-link .arrow, .nav-link, .meta-item .value { transition: none; }
}

/* ---------- Client login page ---------- */
.client-main {
  min-height: 70vh;
  display: flex;
  align-items: center;
}
.client-main .shell {
  display: grid;
  gap: clamp(2rem, 5vh, 3.25rem);
  padding-block: clamp(3rem, 9vh, 6rem);
  width: 100%;
}
.client-head { display: grid; gap: 1rem; max-width: 40ch; }
.client-head h1 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  margin: 0;
}
.client-head p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.45;
  color: var(--fg-secondary);
  margin: 0;
  max-width: 46ch;
}

.login-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  max-width: 30rem;
  width: 100%;
  display: grid;
  gap: 1.5rem;
}
.login-card legend,
.login-card .card-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-tertiary);
  padding: 0;
}
.field { display: grid; gap: 0.5rem; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-secondary);
}
.field input {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--fg-primary);
  background: var(--bg-canvas);
  border: 1px solid var(--border-default);
  padding: 0.75rem 0.875rem;
  width: 100%;
  transition: border-color var(--dur-fast) var(--ease-brand);
}
.field input::placeholder { color: var(--fg-tertiary); }
.field input:focus { border-color: var(--border-strong); outline-offset: 1px; }

.btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bg-canvas);
  background: var(--fg-primary);
  border: 1px solid var(--fg-primary);
  padding: 0.85rem 1.25rem;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-brand),
              color var(--dur-fast) var(--ease-brand);
}
.btn:hover { background: transparent; color: var(--fg-primary); }

.form-note {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--fg-secondary);
  margin: 0;
  min-height: 1.2em;
  border-left: 2px solid var(--border-default);
  padding-left: 0.875rem;
}
.form-note:empty { border-color: transparent; }

.back-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  width: fit-content;
  transition: border-color var(--dur-fast) var(--ease-brand);
}
.back-link:hover { border-color: var(--border-strong); }
.back-link .arrow { display: inline-block; transition: transform var(--dur-fast) var(--ease-brand); }
.back-link:hover .arrow { transform: translateX(-3px); }