:root {
  --ink: #151515;
  --muted: #6c6c6c;
  --line: #d8d8d8;
  --paper: #fff;
  --card: #f4f4f4;
  --orange: #e86b39;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; }
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }

.shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { position: relative; z-index: 2; width: 100%; min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px max(20px, calc((100vw - 1180px) / 2)); border-bottom: 1px solid var(--line); }
.brand { color: inherit; font-size: 12px; font-weight: 500; letter-spacing: .15em; text-decoration: none; white-space: nowrap; }
.topbar-note { color: var(--muted); font-size: 10px; letter-spacing: .12em; text-align: right; }
.is-intro .topbar { position: absolute; color: #fff; border: 0; }
.is-intro .topbar-note { color: #fff; }
main { width: 100%; flex: 1; }
.stage { width: min(calc(100% - 40px), 960px); margin: 0 auto; padding: 64px 0 100px; }
.eyebrow { margin: 0 0 20px; color: #777; font-size: 11px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-weight: 400; letter-spacing: -.075em; }
h1 { max-width: 920px; font-size: clamp(54px, 9vw, 130px); line-height: .87; }
h2 { max-width: 850px; font-size: clamp(42px, 7vw, 76px); line-height: .94; }
h3 { font-size: 18px; line-height: 1.35; }
p { line-height: 1.58; }
.lead { max-width: 590px; color: var(--ink); font-size: clamp(20px, 2.5vw, 28px); line-height: 1.28; }
.intro { width: 100%; min-height: 100svh; margin: 0; padding: max(150px, 23vh) max(20px, calc((100vw - 960px) / 2)) 90px; color: #fff; background: linear-gradient(90deg, rgba(0,0,0,.65), rgba(0,0,0,.16) 88%), url('assets/hero-singapore.jpg') center 54% / cover no-repeat; }
.intro h1 { font-size: clamp(52px, 7.5vw, 108px); }
.intro .eyebrow, .intro .intro-detail { color: #fff; }
.intro-detail { max-width: 520px; margin-bottom: 14px; color: var(--muted); font-size: 16px; line-height: 1.58; }
.intro h1 + .intro-detail { margin-top: 54px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 14px 20px; border: 1px solid var(--ink); border-radius: 0; background: var(--ink); color: #fff; font-size: 14px; font-weight: 700; cursor: pointer; transition: background .2s, color .2s; }
.button:hover { background: #383838; }
.button:disabled { opacity: .4; cursor: not-allowed; }
.button.secondary { color: var(--ink); background: transparent; }
.button.secondary:hover { background: var(--card); }
.intro .button { justify-content: flex-start; min-height: 0; padding: 0 0 7px; border: 0; border-bottom: 1px solid rgba(255,255,255,.8); color: #fff; background: transparent; font-size: 16px; }
.intro .button:hover { border-color: #fff; }
.progress-row { display: flex; justify-content: space-between; gap: 16px; align-items: center; color: #777; font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.progress-track { height: 2px; margin: 13px 0 56px; background: var(--line); overflow: hidden; }
.progress-fill { height: 100%; background: var(--ink); transition: width .25s; }
.question-title { margin-bottom: 42px; }
.context { max-width: 760px; color: #444; font-size: 17px; }
.context p { margin-bottom: 22px; }
.context p:last-child { color: var(--ink); font-weight: 700; margin: 34px 0 0; }
.selection-hint { margin: 42px 0 15px; color: var(--muted); font-size: 13px; }
.options { display: grid; border-top: 1px solid var(--line); }
.option { width: 100%; min-height: 86px; display: flex; align-items: flex-start; gap: 20px; padding: 22px 16px; border: 0; border-bottom: 1px solid var(--line); background: #fff; color: var(--ink); text-align: left; cursor: pointer; line-height: 1.5; font-size: 16px; transition: background .2s; }
.option:hover:not(:disabled) { background: #f8f8f8; }
.option:disabled { cursor: default; }
.option.selected { background: var(--card); box-shadow: inset 4px 0 var(--ink); }
.option-letter { display: grid; place-items: center; flex: none; width: 36px; height: 36px; border: 1px solid var(--ink); border-radius: 50%; color: var(--ink); font-size: 12px; font-weight: 700; }
.selected .option-letter { background: var(--ink); color: #fff; }
.option:not(.selected):disabled { opacity: .55; }
.reveal { margin-top: 58px; padding-top: 12px; border-top: 1px solid var(--line); animation: appear .3s ease-out; }
.reveal-block { margin-top: 24px; padding: 28px 30px; background: var(--card); }
.reveal-block p { margin-bottom: 15px; font-size: 16px; line-height: 1.58; }
.reveal-block p:last-child { margin-bottom: 0; }
.reveal-block.discussion { color: var(--ink); font-weight: 700; }
.reveal-block.discussion p { font-size: 19px; line-height: 1.42; }
.reveal-block.answer { border: 1px solid var(--line); border-left: 4px solid var(--ink); background: #fff; }
.reveal-block.answer strong { color: var(--ink); }
.reveal-block.reflection { color: #555; background: #f1eee8; }
.reveal-block.reflection p { font-size: 14px; }
.is-final main { background: #dce8ee; }
.is-final .stage { padding-top: 90px; }
.is-final .eyebrow { color: #52626b; }
.is-final .lead { max-width: 690px; }
.final-list { list-style: none; counter-reset: final; padding: 0; margin: 54px 0; border-top: 1px solid #9eb2ba; }
.final-list li { counter-increment: final; display: flex; gap: 24px; align-items: flex-start; padding: 26px 0; border-bottom: 1px solid #9eb2ba; line-height: 1.5; font-size: 17px; }
.final-list li::before { content: counter(final, decimal-leading-zero); color: var(--ink); font-size: 12px; font-weight: 700; letter-spacing: .1em; }
.footer { min-height: 72px; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 20px max(20px, calc((100vw - 1180px) / 2)); border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
@keyframes appear { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 699px) {
  .topbar { min-height: 70px; }
  .topbar-note { display: none; }
  .stage { padding-top: 50px; padding-bottom: 72px; }
  .intro { padding-top: max(150px, 22vh); background-position: 46% center; }
  .intro h1 + .intro-detail { margin-top: 45px; }
  .progress-track { margin-bottom: 42px; }
  .question-title { margin-bottom: 30px; }
  .context { font-size: 16px; }
  .selection-hint { margin-top: 36px; }
  .option { gap: 14px; min-height: 72px; padding: 18px 8px; font-size: 15px; }
  .option-letter { width: 32px; height: 32px; }
  .reveal-block { padding: 23px 20px; }
  .reveal-block.discussion p { font-size: 17px; }
  .footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 3px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; } }