:root {
  color-scheme: dark;
  font-family: "Noto Sans KR", sans-serif;
  color: #f4f5ef;
  background: #0d0f0e;
  font-synthesis: none;
  --bg: #0d0f0e;
  --panel: #151816;
  --panel-light: #1b1f1c;
  --text: #f4f5ef;
  --muted: #9ba19c;
  --line: rgba(255, 255, 255, 0.13);
  --acid: #d7ff45;
  --violet: #8b72ff;
  --coral: #ff765f;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html {
  min-width: 320px;
  scroll-behavior: smooth;
  word-break: keep-all;
  background: var(--bg);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    var(--bg);
  background-size: 34px 34px;
}

body::before {
  position: fixed;
  z-index: -2;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(139, 114, 255, 0.09), transparent 35%);
  content: "";
  pointer-events: none;
}

button, select { font: inherit; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
button:focus-visible, a:focus-visible, select:focus-visible { outline: 3px solid var(--acid); outline-offset: 4px; }
h1, h2, h3, p, span, a, button, li, dt, dd { overflow-wrap: normal; }
button { touch-action: manipulation; }

.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;
}

.noscript-message {
  width: min(1280px, calc(100% - 48px));
  margin: 16px auto;
  padding: 14px 16px;
  border: 1px solid var(--coral);
  border-radius: 12px;
  color: #ffd8d1;
  background: rgba(255, 118, 95, 0.08);
  font-size: 0.8rem;
  line-height: 1.6;
}

.page-glow {
  position: fixed;
  z-index: -1;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.12;
  pointer-events: none;
}

.glow-left { top: 22%; left: -410px; background: var(--violet); }
.glow-right { right: -420px; bottom: 3%; background: var(--acid); }

.site-header, main, .site-footer {
  width: min(1280px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 84px;
  border-bottom: 1px solid var(--line);
}

.collection-link {
  justify-self: start;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}
.collection-link::before { margin-right: 0.35em; content: "←"; }

.wordmark {
  display: inline-flex;
  justify-self: center;
  align-items: center;
  gap: 9px;
  padding: 0;
  border: 0;
  color: var(--text);
  background: transparent;
  font: 700 1.05rem/1 "DM Sans", sans-serif;
  letter-spacing: -0.03em;
  cursor: pointer;
}

.wordmark-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--acid); box-shadow: 0 0 16px rgba(215, 255, 69, 0.75); }
.language-control { justify-self: end; }
.language-control select { min-width: 68px; height: 38px; padding: 0 28px 0 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--text); background: #151715; font: 700 0.72rem/1 "DM Sans", sans-serif; cursor: pointer; }

.screen { display: none; }
.screen.is-active { display: block; animation: screen-in 360ms ease both; }
@keyframes screen-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(460px, 1.05fr);
  gap: 76px;
  align-items: center;
  min-height: 730px;
  padding: 76px 0 92px;
  border-bottom: 1px solid var(--line);
}

.eyebrow, .section-heading > div > p, .question-heading > p, .result-heading > p {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 25px;
  color: var(--muted);
  font: 700 0.68rem/1 "DM Sans", sans-serif;
  letter-spacing: 0.17em;
}

.eyebrow span { width: 25px; height: 2px; background: var(--acid); }
.hero h1 { margin: 0; font-size: clamp(4rem, 7.3vw, 7.4rem); font-weight: 900; line-height: 0.87; letter-spacing: -0.08em; }
.hero h1 em { color: var(--acid); font-style: normal; }
.hero-description { max-width: 620px; margin: 34px 0 0; color: #b8bdb9; font-size: clamp(1rem, 1.35vw, 1.16rem); line-height: 1.8; }

.primary-button, .difficulty-option, .next-button {
  border: 0;
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.primary-button {
  display: flex;
  width: min(100%, 410px);
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  margin-top: 30px;
  padding: 0 11px 0 23px;
  border-radius: 15px;
  color: #111310;
  background: var(--acid);
}

.primary-button:hover, .difficulty-option:hover, .next-button:hover { transform: translateY(-2px); }
.primary-button:hover { box-shadow: 0 16px 36px rgba(215, 255, 69, 0.14); }
.button-icon { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 11px; color: var(--text); background: #111310; font-size: 1.05rem; }

.hero-stats { display: flex; gap: clamp(20px, 3vw, 42px); margin: 36px 0 0; }
.hero-stats div { display: flex; flex-direction: column-reverse; gap: 7px; }
.hero-stats dt { color: #727873; font-size: 0.7rem; }
.hero-stats dd { margin: 0; font: 700 1.05rem/1 "DM Sans", sans-serif; }
.hero-stats dd span { margin-left: 2px; font-family: "Noto Sans KR", sans-serif; font-size: 0.68rem; }

.hero-visual { position: relative; min-height: 560px; overflow: hidden; }
.orbit { position: absolute; top: 50%; left: 50%; border: 1px solid rgba(255, 255, 255, 0.09); border-radius: 50%; transform: translate(-50%, -50%); }
.orbit-one { width: 500px; height: 500px; }
.orbit-two { width: 380px; height: 380px; }
.sample-card { position: absolute; top: 50%; left: 50%; width: min(42%, 240px); aspect-ratio: 3 / 4; margin: 0; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.24); border-radius: 22px; background: var(--panel); box-shadow: 0 26px 70px rgba(0, 0, 0, 0.46); }
.sample-card img { width: 100%; height: 100%; object-fit: cover; }
.sample-card figcaption { position: absolute; right: 12px; bottom: 12px; display: grid; width: 32px; height: 32px; place-items: center; border-radius: 50%; color: #10120f; background: var(--acid); font: 700 0.78rem/1 "DM Sans", sans-serif; }
.sample-left { transform: translate(-122%, -50%) rotate(-9deg); opacity: 0.58; }
.sample-center { z-index: 2; transform: translate(-50%, -55%); }
.sample-right { transform: translate(22%, -50%) rotate(9deg); opacity: 0.58; }
.real-signal { position: absolute; z-index: 3; right: 0; bottom: 42px; display: grid; grid-template-columns: auto auto; gap: 3px 9px; padding: 15px 18px; border: 1px solid var(--line); border-radius: 14px; background: rgba(20, 23, 21, 0.92); backdrop-filter: blur(15px); }
.real-signal span { grid-row: 1 / 3; align-self: center; width: 9px; height: 9px; border-radius: 50%; background: var(--acid); box-shadow: 0 0 15px var(--acid); }
.real-signal b { font: 700 0.74rem/1 "DM Sans", sans-serif; }
.real-signal small { color: var(--muted); font: 600 0.56rem/1 "DM Sans", sans-serif; letter-spacing: 0.06em; }

.difficulty-section, .how-section, .about-section { padding: 110px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 42px; }
.section-heading > div > p { margin-bottom: 15px; color: var(--acid); }
.section-heading h2 { margin: 0; font-size: clamp(2.3rem, 4.6vw, 4.5rem); line-height: 1.04; letter-spacing: -0.06em; }
.section-heading > p { max-width: 470px; margin: 0; color: var(--muted); line-height: 1.75; }

.difficulty-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; width: min(100%, 980px); margin: 0 auto; }
.difficulty-option { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 20px; align-items: center; min-height: 160px; padding: 24px; border: 1px solid var(--line); border-radius: 22px; color: var(--text); background: var(--panel); text-align: left; }
.difficulty-option:hover { border-color: rgba(215, 255, 69, 0.55); background: var(--panel-light); }
.expert-card:hover { border-color: rgba(139, 114, 255, 0.7); }
.difficulty-count { display: grid; width: 70px; height: 70px; flex: 0 0 auto; place-items: center; border-radius: 50%; color: #10120f; background: var(--acid); font: 700 2rem/1 "DM Sans", sans-serif; }
.expert-card .difficulty-count { color: var(--text); background: var(--violet); }
.difficulty-copy { display: grid; gap: 7px; min-width: 0; }
.difficulty-copy small { color: var(--muted); font: 700 0.64rem/1 "DM Sans", sans-serif; letter-spacing: 0.13em; }
.difficulty-copy strong { font-size: clamp(1.35rem, 2.2vw, 2rem); line-height: 1.15; letter-spacing: -0.05em; }
.difficulty-copy > span { color: var(--muted); font-size: 0.78rem; line-height: 1.5; }
.difficulty-arrow { display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--text); font-size: 1rem; transition: color 160ms ease, background 160ms ease; }
.difficulty-option:hover .difficulty-arrow { color: #10120f; background: var(--acid); }
.expert-card:hover .difficulty-arrow { color: var(--text); background: var(--violet); }
.difficulty-option:disabled { opacity: 0.46; cursor: wait; transform: none; }

.section-heading.compact { margin-bottom: 35px; }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.how-grid li { min-height: 230px; padding: 28px; border-right: 1px solid var(--line); }
.how-grid li:last-child { border-right: 0; }
.how-grid b { color: var(--acid); font: 700 0.7rem/1 "DM Sans", sans-serif; letter-spacing: 0.1em; }
.how-grid h3 { margin: 60px 0 10px; font-size: 1.35rem; letter-spacing: -0.04em; }
.how-grid p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.7; }
.prototype-note { margin: 28px 0 0; padding: 16px 18px; border: 1px solid rgba(215, 255, 69, 0.2); border-radius: 12px; color: #b6bcac; background: rgba(215, 255, 69, 0.035); font-size: 0.76rem; line-height: 1.7; }
.prototype-note.is-error { border-color: rgba(255, 118, 95, 0.4); color: #ffd0c8; background: rgba(255, 118, 95, 0.06); }

.ad-placement {
  display: grid;
  width: min(970px, 100%);
  min-height: 150px;
  align-content: center;
  justify-items: center;
  gap: 12px;
  margin: 68px auto;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.018);
}

.ad-placement > span { color: #686f69; font: 700 0.56rem/1 "DM Sans", sans-serif; letter-spacing: 0.14em; }
.ad-mount { width: 100%; }
.ad-preview-copy { margin: 0; color: #737a74; font-size: 0.7rem; text-align: center; }
.ad-placement:not(.is-preview) .ad-preview-copy { display: none; }
.ad-placement.is-preview { border-style: dashed; background: repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.012), rgba(255, 255, 255, 0.012) 12px, transparent 12px, transparent 24px); }
.result-ad { margin-top: 56px; margin-bottom: 0; }

.facts-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.facts-grid article { min-height: 235px; padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.015); }
.facts-grid article > span { color: var(--acid); font: 700 0.67rem/1 "DM Sans", sans-serif; letter-spacing: 0.1em; }
.facts-grid h3 { margin: 52px 0 12px; font-size: 1.32rem; letter-spacing: -0.04em; }
.facts-grid p { max-width: 500px; margin: 0; color: var(--muted); font-size: 0.88rem; line-height: 1.75; }

body.is-game-active .site-header, body.is-game-active .site-footer { display: none; }
.game-screen { width: calc(100vw - 48px); min-height: 100vh; margin-left: calc(50% - 50vw + 24px); padding: 0 0 32px; }
.game-bar { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; min-height: 58px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.game-progress { display: flex; align-items: center; gap: 15px; font: 700 0.72rem/1 "DM Sans", sans-serif; }
.game-progress > div { width: min(190px, 18vw); height: 3px; overflow: hidden; background: rgba(255, 255, 255, 0.09); }
.game-progress i { display: block; width: 0; height: 100%; background: var(--acid); transition: width 260ms ease; }
.difficulty-badge { justify-self: center; padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--acid); font: 700 0.62rem/1 "DM Sans", sans-serif; letter-spacing: 0.11em; }
.timer-block { display: flex; justify-self: end; align-items: baseline; gap: 12px; }
.timer-block span { color: var(--muted); font-size: 0.66rem; }
.timer-block strong { min-width: 78px; font: 700 1rem/1 "DM Sans", sans-serif; font-variant-numeric: tabular-nums; }
.question-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: center; gap: 7px 14px; padding: 18px 0; text-align: center; }
.question-heading h1 { margin: 0; font-size: clamp(1.35rem, 2.4vw, 2rem); line-height: 1.15; letter-spacing: -0.05em; }
.question-heading > span { color: var(--muted); font-size: 0.66rem; font-weight: 700; }

.choice-grid { --choice-count: 2; display: grid; grid-template-columns: repeat(var(--choice-count), minmax(0, 1fr)); gap: clamp(10px, 1.8vw, 22px); width: 100%; margin: 0 auto; }
.choice-item { min-width: 0; }
.choice-button { position: relative; width: 100%; padding: 0; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.17); border-radius: 19px; background: var(--panel); cursor: pointer; transition: transform 160ms ease, border-color 160ms ease, opacity 160ms ease; }
.choice-button:not(:disabled):hover { transform: translateY(-5px); border-color: rgba(215, 255, 69, 0.6); }
.choice-button:disabled { cursor: default; }
.choice-button img { display: block; width: 100%; height: auto; max-height: calc(100vh - 168px); object-fit: contain; background: #090b0a; opacity: 0; transition: opacity 220ms ease; }
.choice-button.is-ready img { opacity: 1; }
.choice-label { position: absolute; top: 12px; left: 12px; display: grid; width: 37px; height: 37px; place-items: center; border: 1px solid rgba(255, 255, 255, 0.36); border-radius: 50%; background: rgba(9, 11, 10, 0.74); backdrop-filter: blur(12px); font: 700 0.78rem/1 "DM Sans", sans-serif; }
.choice-result { position: absolute; right: 12px; bottom: 12px; display: none; padding: 8px 10px; border-radius: 999px; color: #10120f; background: var(--acid); font-size: 0.65rem; font-weight: 900; }
.choice-button.is-correct { border-color: var(--acid); box-shadow: 0 0 0 3px rgba(215, 255, 69, 0.13); }
.choice-button.is-correct .choice-result { display: block; }
.choice-button.is-wrong { border-color: var(--coral); box-shadow: 0 0 0 3px rgba(255, 118, 95, 0.12); }
.choice-button.is-dimmed { opacity: 0.55; }
.choice-detail { display: none; min-height: 112px; margin-top: 11px; padding: 14px 15px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255, 255, 255, 0.025); }
.choice-grid.is-answered .choice-detail { display: block; }
.choice-detail[data-answer="real"] { border-color: rgba(215, 255, 69, 0.34); background: rgba(215, 255, 69, 0.045); }
.choice-detail-label { display: block; color: var(--acid); font: 700 0.58rem/1.3 "DM Sans", "Noto Sans KR", sans-serif; letter-spacing: 0.07em; }
.choice-detail[data-answer="ai"] .choice-detail-label { color: #a899ff; }
.choice-detail-copy { margin: 8px 0 0; color: #b7bcb8; font-size: 0.7rem; line-height: 1.62; }
.prompt-disclosure { margin-top: 10px; padding-top: 9px; border-top: 1px solid var(--line); }
.prompt-disclosure summary { color: #c8c0ff; font-size: 0.67rem; font-weight: 800; cursor: pointer; list-style: none; }
.prompt-disclosure summary::-webkit-details-marker { display: none; }
.prompt-disclosure summary::after { margin-left: 6px; content: "+"; }
.prompt-disclosure[open] summary::after { content: "−"; }
.prompt-collapse-label { display: none; }
.prompt-disclosure[open] .prompt-expand-label { display: none; }
.prompt-disclosure[open] .prompt-collapse-label { display: inline; }
.choice-prompt-full { margin: 11px 0 0; color: #aeb3af; font-size: 0.68rem; line-height: 1.62; }
.choice-source-link { display: inline-block; margin-top: 8px; color: var(--text); font-size: 0.67rem; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.loading-message { margin: 17px 0 0; color: var(--muted); font-size: 0.7rem; text-align: center; }
.loading-message.is-ready { visibility: hidden; }

.feedback-panel { display: grid; grid-template-columns: minmax(210px, 0.8fr) minmax(260px, 1.45fr) auto; gap: 28px; align-items: center; width: min(100%, 980px); margin: 28px auto 0; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.feedback-status { display: flex; align-items: center; gap: 13px; }
.feedback-status > span { display: grid; width: 43px; height: 43px; flex: 0 0 auto; place-items: center; border-radius: 50%; color: #10120f; background: var(--acid); font-weight: 900; }
.feedback-status small { color: var(--acid); font: 700 0.58rem/1 "DM Sans", sans-serif; letter-spacing: 0.12em; }
.feedback-status h2 { margin: 4px 0 0; font-size: 1.15rem; letter-spacing: -0.04em; }
.feedback-panel.is-wrong .feedback-status > span { color: white; background: var(--coral); }
.feedback-panel.is-wrong .feedback-status small { color: var(--coral); }
.feedback-copy { padding-left: 26px; border-left: 1px solid var(--line); }
.feedback-copy p { margin: 0; color: #c1c5c1; font-size: 0.8rem; line-height: 1.65; }
.next-button { display: flex; min-height: 47px; align-items: center; gap: 22px; padding: 0 16px; border-radius: 11px; color: #10120f; background: var(--acid); font-size: 0.76rem; }

.result-screen { min-height: calc(100vh - 154px); padding: 90px 0; }
.result-heading { text-align: center; }
.result-heading > p { justify-content: center; margin-bottom: 18px; color: var(--acid); }
.result-heading h1 { margin: 0; font-size: clamp(2.6rem, 6vw, 5.6rem); line-height: 1; letter-spacing: -0.07em; }
.result-heading > span { display: inline-flex; margin-top: 18px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 0.75rem; font-weight: 800; }
.result-layout { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(380px, 1.2fr); gap: 16px; width: min(100%, 900px); margin: 55px auto 0; }
.total-card, .score-breakdown { border: 1px solid var(--line); border-radius: 22px; background: var(--panel); }
.total-card { display: flex; min-height: 350px; flex-direction: column; align-items: center; justify-content: center; padding: 28px; }
.total-card > span { color: var(--muted); font-size: 0.72rem; }
.total-card > strong { margin-top: 10px; color: var(--acid); font: 700 clamp(4rem, 8vw, 6.7rem)/0.9 "DM Sans", sans-serif; letter-spacing: -0.08em; }
.total-card > small { margin-top: 13px; color: #6f756f; font: 700 0.58rem/1 "DM Sans", sans-serif; letter-spacing: 0.15em; }
.total-card p { display: flex; justify-content: space-between; width: 100%; margin: 45px 0 0; padding-top: 17px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.7rem; }
.total-card p b { color: var(--text); font: 700 0.78rem/1 "DM Sans", sans-serif; }
.score-breakdown { margin: 0; padding: 23px 30px; }
.score-breakdown div { display: flex; min-height: 76px; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.score-breakdown div:last-child { border-bottom: 0; }
.score-breakdown dt { color: var(--muted); font-size: 0.78rem; }
.score-breakdown dd { margin: 0; font: 700 1.1rem/1 "DM Sans", sans-serif; }
.score-breakdown .bonus-row dd { color: var(--acid); }
.result-actions { display: flex; align-items: center; justify-content: center; gap: 28px; margin-top: 28px; }
.result-actions .primary-button { width: 330px; margin: 0; }
.text-button { padding: 10px 0; border: 0; border-bottom: 1px solid var(--muted); color: var(--muted); background: transparent; font-size: 0.78rem; font-weight: 800; cursor: pointer; }

.site-footer { display: flex; min-height: 70px; align-items: center; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); color: #666c67; font: 600 0.63rem/1 "DM Sans", sans-serif; letter-spacing: 0.08em; }
.site-footer nav { display: flex; gap: 18px; }
.site-footer a:hover { color: var(--text); }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 20px; padding-top: 90px; }
  .hero-copy { text-align: center; }
  .eyebrow { justify-content: center; }
  .hero-description, .primary-button { margin-right: auto; margin-left: auto; }
  .hero-stats { justify-content: center; }
  .hero-visual { min-height: 530px; }
  .real-signal { right: 7%; }
  .section-heading { align-items: start; flex-direction: column; }
  .feedback-panel { grid-template-columns: 1fr auto; }
  .feedback-copy { grid-column: 1 / 3; grid-row: 2; padding: 18px 0 0; border-top: 1px solid var(--line); border-left: 0; }
}

@media (max-width: 720px) {
  .site-header, main, .site-footer { width: min(100% - 30px, 1280px); }
  .site-header { grid-template-columns: auto 1fr auto; min-height: 70px; }
  .collection-link { width: 28px; overflow: visible; font-size: 0; white-space: nowrap; }
  .collection-link::before { margin-right: 0; color: var(--muted); font-size: 0.9rem; }
  .wordmark { justify-self: center; }
  .hero { min-height: auto; padding: 70px 0; }
  .hero h1 { font-size: clamp(3.8rem, 20vw, 5.3rem); }
  .hero-description { margin-top: 26px; font-size: 0.96rem; }
  .hero-stats { gap: 20px; }
  .hero-visual { min-height: 410px; }
  .orbit-one { width: 360px; height: 360px; }
  .orbit-two { width: 280px; height: 280px; }
  .sample-card { width: min(43%, 180px); border-radius: 16px; }
  .real-signal { right: 2%; bottom: 18px; }
  .difficulty-section, .how-section, .about-section { padding: 78px 0; }
  .difficulty-grid { grid-template-columns: 1fr; }
  .difficulty-option { min-height: 132px; padding: 18px; }
  .difficulty-count { width: 56px; height: 56px; font-size: 1.55rem; }
  .how-grid { grid-template-columns: 1fr; }
  .how-grid li { min-height: 0; padding: 25px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .how-grid h3 { margin-top: 30px; }
  .facts-grid { grid-template-columns: 1fr; }
  .ad-placement { min-height: 120px; margin: 48px auto; padding: 18px; }
  .game-screen { width: calc(100vw - 30px); margin-left: calc(50% - 50vw + 15px); }
  .game-bar { grid-template-columns: 1fr auto; gap: 12px; }
  .difficulty-badge { display: none; }
  .game-progress > div { width: 90px; }
  .timer-block span { display: none; }
  .question-heading { padding: 15px 0; }
  .question-heading h1 { font-size: 1.35rem; }
  .choice-grid { gap: 8px; }
  .choice-button { border-radius: 13px; }
  .choice-button img { max-height: calc(100vh - 148px); }
  .choice-label { top: 7px; left: 7px; width: 30px; height: 30px; }
  .choice-result { right: 6px; bottom: 6px; padding: 6px 8px; font-size: 0.55rem; }
  .choice-detail { min-height: 0; margin-top: 7px; padding: 10px 9px; border-radius: 10px; }
  .choice-detail-label { font-size: 0.5rem; letter-spacing: 0.04em; }
  .choice-detail-copy { margin-top: 6px; font-size: 0.63rem; line-height: 1.55; }
  .prompt-disclosure summary { font-size: 0.62rem; }
  .choice-prompt-full { font-size: 0.62rem; line-height: 1.58; }
  .choice-source-link { margin-top: 6px; font-size: 0.6rem; }
  .choice-grid.is-answered { grid-template-columns: 1fr; gap: 12px; }
  .choice-grid.is-answered .choice-item { display: grid; grid-template-columns: minmax(100px, 32%) minmax(0, 1fr); gap: 10px; align-items: start; }
  .choice-grid.is-answered .choice-detail { height: 100%; margin-top: 0; }
  .feedback-panel { grid-template-columns: 1fr; gap: 18px; }
  .feedback-copy { grid-column: 1; grid-row: auto; }
  .next-button { justify-content: space-between; width: 100%; }
  .result-screen { padding: 65px 0; }
  .result-layout { grid-template-columns: 1fr; }
  .total-card { min-height: 300px; }
  .result-actions { flex-direction: column; }
  .result-actions .primary-button { width: 100%; }
}

@media (max-width: 420px) {
  .language-control select { min-width: 59px; padding-left: 9px; }
  .hero-stats { justify-content: space-between; gap: 8px; }
  .hero-stats dt { font-size: 0.62rem; }
  .difficulty-option { grid-template-columns: auto minmax(0, 1fr); gap: 14px; }
  .difficulty-arrow { display: none; }
  .hero-visual { min-height: 365px; }
  .orbit-one { width: 320px; height: 320px; }
  .orbit-two { width: 240px; height: 240px; }
  .real-signal { display: none; }
  .section-heading h2 { font-size: 2.25rem; }
  .score-breakdown { padding: 18px 22px; }
  .site-footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 8px; padding: 18px 0; line-height: 1.4; }
  .site-footer nav { gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}