/* ===================================================================
 * TriviaWorks.com.au — public site
 * Built to PUBLIC-SITE-IDENTITY-SPEC-2026-08-10.md
 * Every value here traces to a measurement in that document.
 * =================================================================== */

/* ---------- tokens ---------- */
:root {
  /* Colour — the entire palette. Do not add a fourth. */
  --ink:   #000000;
  --paper: #F0F2F0;   /* off-white: text/labels ON black. Not #FFF. */
  --white: #FFFFFF;

  /* Type families */
  --display: "Anton SC", "Arial Narrow", sans-serif;
  --sans:    "Inter Tight", system-ui, -apple-system, sans-serif;

  /* ★ The measured fluid unit: factor = (100vw / 1000) - 0.015
     Verified against the live site at 768/1000/1280/1440/1920px. */
  --f: calc(0.1vw - 0.015px);

  /* Type scale — nominal x factor, clamped to measured min/max */
  --t-hero:  clamp(40px,   calc(70 * var(--f)), 190px);
  --t-lead:  clamp(34px,   calc(35 * var(--f)),  90px);
  --t-alt:   clamp(26px,   calc(40 * var(--f)), 100px);
  --t-card:  clamp(32px,   calc(50 * var(--f)),  70px);  /* max 70 measured */
  --t-body:  clamp(17.6px, calc(12 * var(--f)),  23px);  /* monotonic — see spec §3 */
  --t-micro: 14px;

  /* Layout */
  --container: 1265px;
  --container-wide: 1425px;
  --section-y: 78px;
  --gutter: clamp(20px, 4vw, 60px);

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

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

/* Sharp corners are identity — nothing rounds. */
button, input, textarea, select, .btn { border-radius: 0; }

/* ---------- typography ---------- */
h1, h2, h3 { margin: 0; font-weight: 400; }

.display {
  font-family: var(--display);
  font-size: var(--t-hero);
  line-height: 1;            /* exactly 1.0 — measured */
  text-transform: uppercase;
  letter-spacing: normal;
}
h2, .h-lead { font-size: var(--t-lead);  line-height: 1.15; letter-spacing: -0.02em; }
.h-alt      { font-size: var(--t-alt);   line-height: 1.15; letter-spacing: -0.02em; }
.h-card     { font-size: var(--t-card);  line-height: 1.1;  letter-spacing: -0.02em; }

p { margin: 0 0 1.15em; max-width: 68ch; }
.lead { font-size: clamp(19px, calc(14 * var(--f)), 28px); letter-spacing: -0.01em; }

/* ---------- layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container-wide { width: 100%; max-width: var(--container-wide); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section-tight { padding-block: calc(var(--section-y) * 0.6); }
.on-dark { background: var(--ink); color: var(--paper); }

/* start-aligned by default so multi-paragraph columns share a baseline;
   media+text rows opt into centring with .grid-2--center */
.grid-2 { display: grid; gap: clamp(28px, 5vw, 72px); grid-template-columns: 1fr; align-items: start; }
.grid-2--center { align-items: center; }
@media (min-width: 900px) { .grid-2 { grid-template-columns: 1fr 1fr; } }
.grid-3 { display: grid; gap: clamp(24px, 3vw, 44px); grid-template-columns: 1fr; }
@media (min-width: 800px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

/* ---------- buttons ---------- */
.btn, .btn-text {
  display: inline-block;
  font-family: var(--sans);
  font-size: var(--t-micro);
  letter-spacing: 0.05em;      /* +0.05em — the deliberate opposite of headings */
  text-transform: uppercase;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: background-color .25s var(--ease), color .25s var(--ease), opacity .25s var(--ease);
}
.btn {
  background: var(--ink);
  color: var(--paper);
  padding: 21px 35px;          /* measured */
}
.btn:hover { background: #262626; }
/* Heroes sit on a dark scrimmed photograph, so an ink button nearly disappears into
   it. Invert there - the primary contact CTA has to be the brightest thing on it. */
.on-dark .btn, .hero .btn { background: var(--paper); color: var(--ink); }
.on-dark .btn:hover, .hero .btn:hover { background: var(--white); }

.btn-text {
  background: none;
  color: var(--ink);
  padding: 0;
  padding-bottom: 4px;
  border-bottom: 1px solid currentColor;
}
.btn-text:hover { opacity: .6; }
/* Heroes are photographic: ink text on them is unreadable, same reason as .hero .btn */
.on-dark .btn-text, .hero .btn-text { color: var(--paper); }

/* Visible focus everywhere — the old site had none. */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}
.on-dark a:focus-visible, .on-dark button:focus-visible { outline-color: var(--paper); }

.skip-link {
  position: absolute; left: -9999px;
  background: var(--ink); color: var(--paper); padding: 14px 22px; z-index: 200;
  font-size: var(--t-micro); letter-spacing: .05em; text-transform: uppercase;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- header ---------- */
.site-header {
  position: absolute; inset: 0 0 auto 0; z-index: 100;
  padding: 26px 0;
}
.site-header.is-solid { position: sticky; background: var(--white); border-bottom: 1px solid rgba(0,0,0,.1); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
/* Two real logo files rather than a CSS invert filter: the source artwork is
   BLACK (the upstream file named "…whitetransparent" means "for white bgs"). */
.logo img { width: 168px; }

.nav { display: none; gap: clamp(18px, 2.2vw, 34px); align-items: center; }
@media (min-width: 940px) { .nav { display: flex; } .nav-toggle { display: none; } }
.nav a {
  font-size: var(--t-micro); letter-spacing: .05em; text-transform: uppercase;
  text-decoration: none; color: var(--paper); padding-bottom: 3px;
  border-bottom: 1px solid transparent;
}
.site-header.is-solid .nav a { color: var(--ink); }
.nav a:hover, .nav a[aria-current="page"] { border-bottom-color: currentColor; }

.nav-toggle {
  background: none; border: 0; cursor: pointer; padding: 10px;
  color: var(--paper); font-size: var(--t-micro); letter-spacing: .05em; text-transform: uppercase;
}
.site-header.is-solid .nav-toggle { color: var(--ink); }

.nav-drawer {
  position: fixed; inset: 0; background: var(--ink); color: var(--paper);
  display: flex; flex-direction: column; justify-content: center; gap: 8px;
  padding: var(--gutter); z-index: 150;
  transform: translateX(100%); transition: transform .4s var(--ease);
}
.nav-drawer[data-open="true"] { transform: translateX(0); }
.nav-drawer a {
  font-family: var(--display); font-size: clamp(30px, 7vw, 54px);
  text-transform: uppercase; text-decoration: none; color: var(--paper);
  line-height: 1.2;
}
.nav-drawer .close { position: absolute; top: 26px; right: var(--gutter); background: none; border: 0; color: var(--paper); font-size: 15px; letter-spacing: .05em; text-transform: uppercase; cursor: pointer; }

/* ---------- hero ---------- */
/* svh, not vh: on mobile vh counts the retractable browser chrome, which is what
   pushes the CTA below the fold on a phone. */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; color: var(--paper); overflow: hidden; }
.hero-media { position: absolute; inset: 0; z-index: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
/* Directional scrim: heaviest behind the copy on the left, lightest over the
   photograph on the right, so the image still reads. Measured legibility fix —
   a flat 55% left the sub-copy sitting on highlights. */
.hero-media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(0,0,0,.86) 0%, rgba(0,0,0,.72) 34%, rgba(0,0,0,.40) 68%, rgba(0,0,0,.30) 100%);
}
@media (max-width: 899px) {
  /* One column on small screens — copy overlaps the whole frame, so scrim evenly. */
  .hero-media::after { background: linear-gradient(180deg, rgba(0,0,0,.62) 0%, rgba(0,0,0,.72) 60%, rgba(0,0,0,.82) 100%); }
}
.hero .container { position: relative; z-index: 2; padding-block: clamp(104px, 13vh, 140px) clamp(52px, 8vh, 84px); }
.hero-kicker {
  font-size: var(--t-micro); letter-spacing: .18em; text-transform: uppercase;
  margin: 0 0 18px; opacity: .85;
}
/* 18ch, not 15ch: at 15ch the homepage headline broke to four lines and pushed
   the CTA off-screen. 18ch holds it to three without changing the type scale. */
.hero .display { max-width: 18ch; }
.hero-sub { margin-top: 22px; max-width: 46ch; }

/* ---------- cards / media blocks ---------- */
.media-figure img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.card-num {
  font-family: var(--display); font-size: clamp(38px, calc(46 * var(--f)), 62px);
  line-height: 1; margin-bottom: 14px; opacity: .3;
}
.rule { height: 1px; background: currentColor; opacity: .16; border: 0; margin: 0; }

.people { display: grid; gap: clamp(36px, 5vw, 70px); grid-template-columns: 1fr; }
@media (min-width: 860px) { .people { grid-template-columns: repeat(2, 1fr); } }
.person img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; filter: grayscale(1); }
.person-role { font-size: var(--t-micro); letter-spacing: .14em; text-transform: uppercase; margin: 20px 0 6px; opacity: .6; }
.person-links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 18px; }
.person-links a { font-size: 13px; letter-spacing: .08em; text-transform: uppercase; text-decoration: none; border-bottom: 1px solid currentColor; padding-bottom: 2px; }

/* ---------- forms ---------- */
.form-grid { display: grid; gap: 22px; grid-template-columns: 1fr; max-width: 720px; }
@media (min-width: 700px) { .form-row-2 { display: grid; gap: 22px; grid-template-columns: 1fr 1fr; } }
.field label {
  display: block; font-size: var(--t-micro); letter-spacing: .1em;
  text-transform: uppercase; margin-bottom: 9px;
}
.field input, .field textarea, .field select {
  width: 100%; padding: 15px 16px; font: inherit; font-size: 16px; /* 16px: stops iOS zoom */
  background: var(--white); color: var(--ink);
  border: 1px solid rgba(0,0,0,.28);
}
.on-dark .field input, .on-dark .field textarea, .on-dark .field select {
  background: transparent; color: var(--paper); border-color: rgba(240,242,240,.4);
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: currentColor; }
.field textarea { min-height: 150px; resize: vertical; }
.field .hint { font-size: 13px; opacity: .6; margin-top: 7px; }
.field-error { font-size: 13.5px; margin-top: 7px; font-weight: 500; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-status { margin-top: 20px; font-size: 15.5px; }
.form-status:empty { display: none; }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: var(--paper); padding-block: 64px 40px; }
.footer-grid { display: grid; gap: 40px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
.site-footer h3 { font-size: var(--t-micro); letter-spacing: .14em; text-transform: uppercase; opacity: .6; margin-bottom: 16px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 11px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-base { margin-top: 52px; padding-top: 26px; border-top: 1px solid rgba(240,242,240,.2); display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; font-size: 14px; opacity: .65; }

/* ---------- motion: the word-stagger reveal, no JS libraries ----------
   Replaces GSAP + ScrollTrigger + split-type + anime.js + lenis + jQuery. */
.reveal .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.36em) rotateX(-72deg);
  transform-origin: 50% 100%;
}
.reveal.is-in .word {
  animation: word-in .78s var(--ease) forwards;
  animation-delay: calc(var(--i) * 42ms);
}
@keyframes word-in {
  to { opacity: 1; transform: translateY(0) rotateX(0); }
}
.fade-up { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.fade-up.is-in { opacity: 1; transform: none; }

/* No-JS and reduced-motion must both show everything. */
.no-js .reveal .word, .no-js .fade-up { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal .word, .fade-up { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
}

/* ===================================================================
 * Format demos, video, and contact surfaces (2026-08-10)
 * =================================================================== */

/* ---------- demo ---------- */
.demo { border: 1px solid rgba(0,0,0,.16); padding: clamp(22px, 3.4vw, 44px); background: var(--white); }
.on-dark .demo { border-color: rgba(240,242,240,.28); background: transparent; }
.demo-head { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: baseline; margin-bottom: 22px; }
.demo-progress { font-size: var(--t-micro); letter-spacing: .12em; text-transform: uppercase; opacity: .6; }
.demo-kicker { font-size: var(--t-micro); letter-spacing: .16em; text-transform: uppercase; opacity: .6; margin: 0 0 12px; }
.demo-stem { font-size: clamp(23px, calc(26 * var(--f)), 40px); line-height: 1.22; letter-spacing: -.015em; margin: 0 0 26px; max-width: 30ch; }

.demo-options { display: grid; gap: 10px; }
@media (min-width: 680px) { .demo-options { grid-template-columns: 1fr 1fr; } }
.demo-option {
  text-align: left; font: inherit; font-size: 16px;
  padding: 17px 19px; cursor: pointer;
  background: var(--white); color: var(--ink);
  border: 1px solid rgba(0,0,0,.28);
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}
.on-dark .demo-option { background: transparent; color: var(--paper); border-color: rgba(240,242,240,.4); }
.demo-option:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
.on-dark .demo-option:hover:not(:disabled) { background: var(--paper); color: var(--ink); }
.demo-option:disabled { cursor: default; opacity: .75; }
/* Never colour-only: a mark carries the same information. */
.demo-option.is-correct { border-width: 3px; opacity: 1; font-weight: 500; }
.demo-option.is-correct::after { content: " ✓"; }
.demo-option.is-wrong { opacity: .5; }
.demo-option.is-wrong::after { content: " ✕"; }

.demo-feedback { margin-top: 26px; padding-top: 22px; border-top: 1px solid rgba(0,0,0,.14); }
.on-dark .demo-feedback { border-top-color: rgba(240,242,240,.24); }
.demo-verdict { font-size: 19px; font-weight: 500; margin: 0 0 8px; }
.demo-note { opacity: .78; max-width: 58ch; margin-bottom: 20px; }
.demo-clock { font-family: var(--mono, ui-monospace, monospace); font-size: 15px; opacity: .6; margin: 0 0 18px; }
.demo-buzz {
  font-family: var(--display); font-size: clamp(30px, 6vw, 46px);
  letter-spacing: .04em; padding: 26px 54px; cursor: pointer;
  background: var(--ink); color: var(--paper); border: 0;
  transition: transform .12s var(--ease);
}
.on-dark .demo-buzz { background: var(--paper); color: var(--ink); }
.demo-buzz:active { transform: scale(.97); }
.demo-end .demo-actions { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; margin-top: 26px; }
.demo-outro { opacity: .78; max-width: 56ch; margin-top: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- video ---------- */
.video-figure { margin: 0; position: relative; }
.video-figure video { width: 100%; display: block; background: #000; aspect-ratio: 16 / 9; object-fit: cover; }
.video-caption { font-size: 14.5px; opacity: .65; margin-top: 12px; }
.video-actions { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; margin-top: 18px; }

/* ---------- contact surfaces ---------- */
/* A persistent enquiry route in the header, on every page. */
/* ★ Must out-specify `.nav a` (0,1,1). Written as `.nav a.header-cta` because the
   plain class lost the cascade and shipped paper-on-paper - an invisible button. */
.nav a.header-cta, .header-cta {
  font-size: var(--t-micro); letter-spacing: .05em; text-transform: uppercase;
  text-decoration: none; padding: 13px 22px; white-space: nowrap;
  background: var(--paper); color: var(--ink);
  border-bottom: 0;
}
.site-header.is-solid .nav a.header-cta { background: var(--ink); color: var(--paper); }
.nav a.header-cta:hover { border-bottom: 0; }
.header-cta:hover { opacity: .85; }
@media (max-width: 939px) { .nav-toggle + .header-cta, .header-cta { display: none; } }
@media (max-width: 939px) { .header-inner .header-cta { display: none; } }

/* Inline mid-page prompt, so an enquiry is never more than a screen away. */
.inline-cta {
  display: flex; flex-wrap: wrap; gap: 18px 30px; align-items: center; justify-content: space-between;
  padding: 26px 0; margin: 44px 0 0; border-top: 1px solid rgba(0,0,0,.15); border-bottom: 1px solid rgba(0,0,0,.15);
}
.on-dark .inline-cta { border-color: rgba(240,242,240,.24); }
.inline-cta p { margin: 0; max-width: 46ch; }

.contact-routes { display: grid; gap: 14px; grid-template-columns: 1fr; margin-top: 30px; }
@media (min-width: 760px) { .contact-routes { grid-template-columns: repeat(3, 1fr); } }
.contact-route {
  display: block; text-decoration: none; padding: 22px;
  border: 1px solid rgba(240,242,240,.3);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.contact-route:hover { background: var(--paper); color: var(--ink); }
.contact-route strong { display: block; font-size: 18px; font-weight: 500; margin-bottom: 6px; letter-spacing: -.01em; }
.contact-route span { font-size: 15px; opacity: .75; }

.next-steps { display: grid; gap: 22px; grid-template-columns: 1fr; margin-top: 34px; }
@media (min-width: 700px) { .next-steps { grid-template-columns: repeat(3, 1fr); } }
.next-steps li { list-style: none; }
.next-steps .n { font-family: var(--display); font-size: 30px; line-height: 1; opacity: .32; display: block; margin-bottom: 8px; }

.form-success {
  border: 2px solid currentColor; padding: 26px; margin-top: 8px;
}
.form-success h3 { font-size: 21px; font-weight: 500; margin: 0 0 8px; letter-spacing: -.01em; }
.form-success p { margin: 0; }