:root {
  color-scheme: dark;
  --bg: #06101d;
  --surface: #0c1d35;
  --surface-2: #10284a;
  --line: rgba(185, 217, 235, 0.14);
  --text: #eaf3fa;
  --muted: #9fb6c9;
  --faint: #6f879c;
  --cb: #b9d9eb;          /* Columbia Blue */
  --cb-strong: #75aadb;   /* Columbia web blue */
  --navy: #003057;        /* Georgia Tech Navy */
  --gold: #b3a369;        /* Georgia Tech Tech Gold */
  --gold-bright: #d6c27f;
  --radius: 16px;
  --font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(117, 170, 219, 0.16), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(0, 48, 87, 0.6), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100dvh;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
a { color: var(--cb); }
button { font: inherit; color: inherit; }

.wrap { max-width: 480px; margin: 0 auto; padding: 16px 18px 48px; }

/* top bar */
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.brand { font-size: 12px; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; text-decoration: none; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang button { background: none; border: 0; padding: 6px 12px; font-size: 13px; color: var(--muted); cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--cb); color: var(--navy); font-weight: 700; }

/* hero */
.eyebrow { color: var(--gold-bright); font-size: 13px; font-weight: 600; letter-spacing: 0.02em; margin: 20px 0 6px; }
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 16px; white-space: pre-line; letter-spacing: -0.02em; }
h2 { font-size: 18px; margin: 0 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 15px; margin: 0 0 6px; }
p { margin: 0 0 10px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* loop */
.loop { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin: 16px 0 10px; position: relative; }
.loop .step {
  text-align: center; padding: 10px 4px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--line);
  font-weight: 700; font-size: 14px; position: relative;
}
.loop .step small { display: block; font-weight: 500; font-size: 11px; color: var(--muted); }
.loop .step.on { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); }
.loop .step.on small { color: var(--gold-bright); }
.loop .step:not(:last-child)::after {
  content: "→"; position: absolute; right: -8px; top: 50%; transform: translateY(-50%);
  color: var(--faint); font-size: 12px; z-index: 1;
}
.loop-back { text-align: center; font-size: 12px; color: var(--faint); margin-top: -4px; }

/* cards */
.card {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin: 14px 0;
}

/* picker */
.axis { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 8px; }
.pick {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 12px; text-align: left; cursor: pointer; transition: border-color .15s, background .15s;
  min-height: 64px;
}
.pick b { font-size: 20px; margin-right: 6px; }
.pick .lbl { font-weight: 700; font-size: 14px; }
.pick .desc { display: block; font-size: 12px; color: var(--muted); line-height: 1.35; margin-top: 2px; }
.pick[aria-pressed="true"] { border-color: var(--cb); background: rgba(185, 217, 235, 0.12); }
.pick[aria-pressed="true"] b { color: var(--cb); }

.btn {
  display: block; width: 100%; border: 0; border-radius: 14px; padding: 15px 16px;
  font-weight: 700; font-size: 16px; cursor: pointer; text-align: center; text-decoration: none;
}
.btn-primary { background: var(--cb); color: var(--navy); }
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--cb); border: 1px solid var(--line); margin-top: 10px; }
.btn-gold { background: var(--gold); color: #1a1606; }

/* quiz */
.progress { height: 4px; background: var(--surface); border-radius: 4px; overflow: hidden; margin: 18px 0; }
.progress i { display: block; height: 100%; background: var(--cb); transition: width .25s; }
.qtext { font-size: 21px; font-weight: 700; line-height: 1.4; margin: 6px 0 18px; }
.opt {
  display: block; width: 100%; text-align: left; background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; padding: 16px; margin-bottom: 10px; font-size: 15px; cursor: pointer;
}
.opt:active { border-color: var(--cb); }

/* result */
.type-big { font-size: 64px; font-weight: 800; letter-spacing: 0.04em; line-height: 1; margin: 8px 0 6px; color: var(--cb); }
.nick { color: var(--gold-bright); font-weight: 600; margin-bottom: 4px; }
.field-name { font-size: 22px; font-weight: 800; line-height: 1.35; letter-spacing: -0.01em; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip {
  font-size: 12.5px; padding: 5px 10px; border-radius: 999px; background: rgba(185, 217, 235, 0.10);
  border: 1px solid var(--line); color: var(--text);
}
.chip.gold { background: rgba(179, 163, 105, 0.15); border-color: rgba(179, 163, 105, 0.45); color: var(--gold-bright); }
.axes-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 14px; }
.axes-row div { background: rgba(6, 16, 29, 0.5); border-radius: 10px; padding: 8px 4px; text-align: center; font-size: 11.5px; color: var(--muted); line-height: 1.3; }
.axes-row b { display: block; color: var(--text); font-size: 16px; }

.section-label { font-size: 12px; font-weight: 700; letter-spacing: 0.05em; color: var(--cb-strong); text-transform: uppercase; margin-bottom: 6px; }

/* tabs */
.tabs { display: flex; gap: 6px; margin: 4px 0 12px; }
.tab { flex: 1; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 8px; font-size: 13px; font-weight: 600; color: var(--muted); cursor: pointer; }
.tab[aria-selected="true"] { color: var(--navy); background: var(--cb); border-color: var(--cb); }

.paper { padding: 12px 0; border-top: 1px solid var(--line); }
.paper:first-child { border-top: 0; padding-top: 2px; }
.paper .t { font-weight: 700; font-size: 14.5px; line-height: 1.4; }
.paper .meta { font-size: 12px; color: var(--faint); margin: 2px 0 4px; }
.paper .why { font-size: 13.5px; color: var(--muted); }
.paper .links { display: flex; gap: 8px; margin-top: 6px; }
.paper .links a {
  font-size: 12px; font-weight: 600; text-decoration: none; padding: 4px 10px; border-radius: 8px;
  border: 1px solid var(--line); color: var(--cb);
}

/* opposite */
.opp { border-color: rgba(179, 163, 105, 0.45); }
.opp .type-mid { font-size: 36px; font-weight: 800; color: var(--gold-bright); letter-spacing: 0.04em; line-height: 1; }
.vs { display: flex; align-items: center; gap: 10px; margin: 6px 0 12px; }
.vs .me { font-size: 22px; font-weight: 800; color: var(--cb); }
.vs .arrow { color: var(--faint); }
.room { font-size: 14px; background: rgba(179, 163, 105, 0.12); border-radius: 10px; padding: 10px 12px; margin: 0 0 12px; }
.room:empty { display: none; }
.room b { color: var(--gold-bright); }
.quote { border-left: 3px solid var(--gold); padding: 4px 0 4px 12px; margin: 12px 0; }
.evidence { font-size: 12.5px; color: var(--muted); background: rgba(6, 16, 29, 0.5); border-radius: 10px; padding: 10px 12px; margin-top: 12px; }

/* grid of all types */
.grid16 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.grid16 a {
  text-align: center; text-decoration: none; padding: 10px 2px; border-radius: 10px; font-weight: 700; font-size: 14px;
  background: var(--surface); border: 1px solid var(--line); color: var(--text);
}
.grid16 a.cur { border-color: var(--cb); color: var(--cb); }

.disclaimer { font-size: 12px; color: var(--faint); text-align: center; margin-top: 24px; line-height: 1.5; }

/* modal for image fallback */
.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.8); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 20px; z-index: 10; }
.modal img { max-width: 100%; max-height: 75dvh; border-radius: 12px; }
.modal p { color: var(--text); margin-top: 12px; text-align: center; }

.fade-in { animation: fade .25s ease-out; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }