:root {
  --navy: #06174f;
  --navy-2: #0a2d92;
  --blue: #1768ff;
  --cyan: #38d5ff;
  --yellow: #ffde4d;
  --ink: #101b3f;
  --muted: #677397;
  --paper: #f7f9ff;
  --white: #fff;
  --green: #20bd7a;
  --red: #ff5b68;
  --shadow: 0 28px 80px rgba(4, 18, 67, .25);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { min-height: 100%; background: var(--navy); }
body { margin: 0; min-width: 320px; min-height: 100vh; color: var(--white); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", sans-serif; background: radial-gradient(circle at 12% 8%, rgba(54, 126, 255, .56), transparent 31%), radial-gradient(circle at 86% 18%, rgba(56, 213, 255, .18), transparent 24%), linear-gradient(145deg, #07194f 0%, #052470 48%, #06184e 100%); overflow-x: hidden; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; }
.background-grid { position: fixed; inset: 0; pointer-events: none; opacity: .12; background-image: linear-gradient(rgba(255,255,255,.2) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.2) 1px, transparent 1px); background-size: 54px 54px; mask-image: linear-gradient(to bottom, #000, transparent 78%); }
.app-shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 0 0 72px; position: relative; z-index: 1; }
.site-header { min-height: 86px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; gap: 12px; align-items: center; color: inherit; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; color: var(--navy); background: var(--yellow); font-size: 24px; box-shadow: 0 10px 30px rgba(255,222,77,.28); }
.brand strong { display: block; font-size: 19px; letter-spacing: .05em; }
.brand small { display: block; margin-top: 2px; font-size: 10px; letter-spacing: .12em; color: rgba(255,255,255,.66); }
.icon-button { width: 44px; height: 44px; border-radius: 50%; border: 1px solid rgba(255,255,255,.23); background: rgba(255,255,255,.08); color: #fff; cursor: pointer; font-weight: 800; }
.icon-button[aria-pressed="false"] { opacity: .45; }
.screen { display: none; }
.screen.is-active { display: block; animation: screenIn .45s cubic-bezier(.2,.8,.2,1); }
@keyframes screenIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
.start-screen { display: none; grid-template-columns: 1.02fr .98fr; gap: 70px; align-items: center; padding-top: 54px; }
.start-screen.is-active { display: grid; }
.hero-copy { max-width: 590px; }
.eyebrow { margin: 0 0 18px; font-weight: 800; letter-spacing: .17em; font-size: 12px; color: var(--cyan); }
h1 { margin: 0; font-size: clamp(48px, 6.4vw, 82px); line-height: 1.06; letter-spacing: -.055em; }
h1 em { color: var(--yellow); font-style: normal; }
.lead { max-width: 560px; margin: 26px 0 0; color: rgba(255,255,255,.76); font-size: clamp(16px, 2vw, 20px); line-height: 1.9; }
.hero-actions { margin-top: 34px; }
.hero-actions > p { margin: 13px 0 0 10px; color: rgba(255,255,255,.55); font-size: 12px; }
.primary-button, .secondary-button { border: 0; cursor: pointer; border-radius: 999px; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.primary-button { min-height: 58px; padding: 0 28px; background: var(--yellow); color: #1a2450; font-weight: 900; font-size: 17px; box-shadow: 0 16px 34px rgba(255,222,77,.22); }
.primary-button:hover { transform: translateY(-2px); box-shadow: 0 20px 42px rgba(255,222,77,.32); }
.primary-button span { margin-left: 10px; }
.secondary-button { min-height: 48px; padding: 0 20px; color: #fff; background: rgba(255,255,255,.09); border: 1px solid rgba(255,255,255,.2); font-weight: 800; }
.secondary-button:hover { background: rgba(255,255,255,.15); transform: translateY(-1px); }
.challenge-banner { margin-top: 25px; padding: 14px 16px; border: 1px solid rgba(255,222,77,.52); background: rgba(255,222,77,.11); border-radius: 16px; color: #fff5b2; font-weight: 700; line-height: 1.6; }
.preview-card { min-height: 485px; padding: 32px; border-radius: 34px; color: var(--ink); background: linear-gradient(145deg, #fff, #edf3ff); box-shadow: var(--shadow); transform: rotate(2deg); position: relative; overflow: hidden; }
.preview-card::before { content:""; position: absolute; width: 220px; height: 220px; border-radius: 50%; background: rgba(23,104,255,.08); right: -80px; top: -90px; }
.preview-topline { display: flex; justify-content: space-between; font-size: 12px; font-weight: 900; letter-spacing: .08em; color: #516085; }
.preview-progress { height: 8px; margin: 16px 0 44px; border-radius: 999px; background: #dfe6f5; overflow: hidden; }
.preview-progress i { display: block; width: 62%; height: 100%; border-radius: inherit; background: var(--blue); }
.preview-label { margin: 0 0 22px; font-size: 17px; font-weight: 800; }
.preview-sequence { display: grid; grid-template-columns: repeat(5,1fr); gap: 10px; }
.preview-sequence span, .preview-sequence b { display: grid; place-items: center; aspect-ratio: 1; border-radius: 18px; background: #f4f7fc; border: 1px solid #d5dced; font-size: 26px; }
.preview-sequence b { background: #0e2d85; color: #fff; }
.preview-options { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; margin-top: 22px; }
.preview-options span { display: grid; place-items: center; min-height: 58px; border: 1px solid #d6deed; border-radius: 15px; font-weight: 800; background: #fff; }
.preview-options .is-picked { color: #14235a; border-color: var(--yellow); background: var(--yellow); box-shadow: 0 8px 20px rgba(255,222,77,.28); }
.preview-stamp { position: absolute; right: 26px; bottom: 20px; color: var(--green); font-size: 42px; font-style: italic; font-weight: 1000; letter-spacing: -.08em; transform: rotate(-8deg); }
.feature-strip { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4,1fr); margin-top: 28px; border-top: 1px solid rgba(255,255,255,.16); border-bottom: 1px solid rgba(255,255,255,.16); }
.feature-strip div { padding: 25px 18px; display: flex; justify-content: center; align-items: baseline; gap: 9px; border-right: 1px solid rgba(255,255,255,.13); }
.feature-strip div:last-child { border-right: 0; }
.feature-strip strong { color: var(--yellow); font-size: 34px; }
.feature-strip span { color: rgba(255,255,255,.68); font-size: 13px; }
.how-to { grid-column: 1/-1; margin-top: 36px; padding: 42px; border-radius: var(--radius); color: var(--ink); background: rgba(255,255,255,.96); }
.how-to h2 { margin: 0 0 28px; font-size: 26px; }
.how-to ol { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.how-to li { display:flex; gap: 15px; padding: 19px; background: #f1f5ff; border-radius: 18px; }
.how-to li > span { flex: 0 0 auto; display:grid; place-items:center; width: 37px; height: 37px; border-radius: 50%; background: var(--blue); color:#fff; font-size: 12px; font-weight:900; }
.how-to strong { display:block; margin: 2px 0 7px; }
.how-to li p { margin:0; color: var(--muted); font-size: 13px; line-height:1.55; }
.disclaimer { margin: 26px 0 0; color: #7b849e; font-size: 11px; line-height: 1.7; }
.game-screen { max-width: 850px; margin: 42px auto 0; }
.game-hud { display: grid; grid-template-columns: 1fr auto; gap: 25px; align-items: center; margin-bottom: 18px; }
.game-hud > div:first-child > span { font-size: 12px; font-weight: 900; letter-spacing: .14em; color: rgba(255,255,255,.72); }
.progress-track { width: min(520px, 100%); height: 8px; margin-top: 11px; background: rgba(255,255,255,.14); border-radius:999px; overflow:hidden; }
.progress-track i { display:block; width:12.5%; height:100%; background:var(--yellow); border-radius:inherit; transition: width .3s ease; }
.timer { display: flex; align-items: center; gap: 4px; padding: 13px 18px; min-width: 105px; justify-content: center; border: 1px solid rgba(255,255,255,.22); border-radius: 18px; background: rgba(255,255,255,.1); font-size: 20px; font-weight: 900; font-variant-numeric: tabular-nums; }
.timer.is-low { color: #fff; background: rgba(255,91,104,.27); border-color: rgba(255,91,104,.6); animation: pulse .8s infinite alternate; }
@keyframes pulse { to { transform: scale(1.04); } }
.question-card { min-height: 590px; padding: clamp(26px, 5vw, 54px); border-radius: 34px; background: var(--paper); color: var(--ink); box-shadow: var(--shadow); position:relative; overflow:hidden; }
.question-card::after { content:""; position:absolute; width:260px; height:260px; border-radius:50%; background: rgba(23,104,255,.05); right:-120px; top:-120px; pointer-events:none; }
.question-category { margin:0 0 14px; color:var(--blue); font-size:11px; font-weight:900; letter-spacing:.17em; }
.question-card h2 { margin:0; font-size:clamp(25px,4vw,40px); letter-spacing:-.035em; }
.question-prompt { min-height: 24px; margin:12px 0 0; color:var(--muted); line-height:1.7; }
.question-visual { min-height: 190px; margin:32px 0 26px; display:grid; place-items:center; }
.sequence { display:flex; flex-wrap:wrap; justify-content:center; gap:clamp(8px,2vw,15px); }
.sequence span { width:clamp(52px,10vw,76px); aspect-ratio:1; display:grid; place-items:center; border:2px solid #d9e0ef; border-radius:20px; background:#fff; font-size:clamp(22px,4vw,32px); font-weight:900; box-shadow:0 8px 18px rgba(11,31,85,.05); }
.sequence span:last-child { background:#0a2c89; color:#fff; border-color:#0a2c89; }
.arrow-sequence span { font-size:42px; }
.logic-board { display:grid; grid-template-columns: repeat(2, minmax(130px,180px)); gap:10px; }
.logic-line { padding:16px 20px; border:1px solid #d7dfef; background:#fff; border-radius:16px; font-size:23px; text-align:center; font-weight:800; }
.matrix-board { display:grid; grid-template-columns:repeat(2, 112px); gap:8px; padding:10px; background:#d7e0f3; border-radius:18px; }
.matrix-cell { min-height:102px; display:grid; place-items:center; background:#fff; border-radius:12px; }
.shape { width:58px; height:58px; border:4px solid var(--ink); position:relative; }
.shape.circle { border-radius:50%; }
.shape i { position:absolute; width:10px; height:10px; border-radius:50%; background:var(--blue); top:50%; left:50%; transform:translate(-50%,-50%); }
.shape.two i:first-child { left:34%; }
.shape.two i:last-child { left:66%; }
.matrix-question { font-size:42px; font-weight:900; color:var(--blue); }
.memory-tray { display:flex; flex-wrap:wrap; justify-content:center; gap:12px; padding:24px; min-height:128px; align-items:center; border-radius:22px; background:#071d61; color:#fff; transition:filter .25s ease, opacity .25s ease; }
.memory-tray span { display:grid; place-items:center; width:54px; height:54px; border-radius:16px; background:rgba(255,255,255,.12); font-size:30px; }
.memory-tray.is-hidden span { color:transparent; background:rgba(255,255,255,.07); }
.memory-tray.is-hidden span::after { content:"?"; color:rgba(255,255,255,.5); }
.answer-area { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
.answer-button { min-height:68px; border:2px solid #d8e0ef; background:#fff; color:var(--ink); border-radius:18px; cursor:pointer; font-weight:900; font-size:18px; transition:.16s ease; }
.answer-button:hover { border-color:var(--blue); transform:translateY(-2px); box-shadow:0 10px 22px rgba(23,104,255,.12); }
.answer-button.is-correct { background:#e1f9ef; color:#08744b; border-color:var(--green); }
.answer-button.is-wrong { background:#ffebed; color:#b32437; border-color:var(--red); }
.answer-button:disabled { cursor:default; transform:none; }
.tile-grid { grid-template-columns:repeat(3,1fr); max-width:390px; margin:0 auto; }
.tile-grid .answer-button { aspect-ratio:1; font-size:clamp(24px,5vw,37px); }
.feedback { min-height:28px; margin-top:18px; font-weight:800; text-align:center; color:var(--green); }
.feedback.is-wrong { color:var(--red); }
.result-screen { max-width:900px; margin:36px auto 0; }
.result-card { padding:clamp(28px,6vw,64px); border-radius:36px; background:linear-gradient(145deg,rgba(255,255,255,.98),#eef4ff); color:var(--ink); box-shadow:var(--shadow); text-align:center; position:relative; overflow:hidden; }
.result-card::before { content:""; position:absolute; width:420px; height:420px; border-radius:50%; background:rgba(23,104,255,.06); top:-240px; right:-140px; }
.result-kicker { display:inline-block; margin:0; padding:9px 15px; border-radius:999px; color:#0a53c8; background:#dfebff; font-size:13px; font-weight:900; }
.score-lockup { margin:22px auto 10px; }
.score-lockup span, .score-lockup small { display:block; color:var(--muted); font-size:12px; font-weight:800; letter-spacing:.08em; }
.score-lockup strong { display:block; margin:-6px 0 -6px; color:var(--blue); font-size:clamp(88px,18vw,150px); line-height:1; letter-spacing:-.09em; font-variant-numeric:tabular-nums; }
.result-card h2 { margin:18px 0 0; font-size:clamp(25px,4vw,38px); letter-spacing:-.04em; }
.result-message { max-width:610px; margin:16px auto 0; color:var(--muted); line-height:1.8; }
.result-meta { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin:30px 0 28px; }
.result-meta div { padding:16px 10px; border-radius:17px; background:#fff; border:1px solid #dbe3f3; }
.result-meta span { display:block; color:var(--muted); font-size:11px; }
.result-meta strong { display:block; margin-top:5px; font-size:19px; }
.challenge-result { margin: -8px 0 24px; padding: 14px; border-radius:16px; font-weight:900; }
.challenge-result.is-win { color:#08744b; background:#dcf8eb; }
.challenge-result.is-lose { color:#8b5b00; background:#fff4c6; }
.ability-list { display:grid; gap:14px; text-align:left; margin:0 auto 32px; max-width:650px; }
.ability-row { display:grid; grid-template-columns:110px 1fr 46px; align-items:center; gap:13px; font-size:13px; font-weight:800; }
.ability-bar { height:10px; background:#dfe6f3; border-radius:999px; overflow:hidden; }
.ability-bar i { display:block; height:100%; border-radius:inherit; background:linear-gradient(90deg,var(--blue),var(--cyan)); transform-origin:left; animation:barGrow .8s ease both; }
@keyframes barGrow { from { transform:scaleX(0); } }
.share-actions { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; max-width:650px; margin:0 auto; }
.share-actions .primary-button { grid-column:1/-1; }
.result-card .secondary-button { color:var(--ink); background:#fff; border-color:#d4ddef; }
.retry-row { display:flex; justify-content:center; gap:20px; flex-wrap:wrap; margin-top:25px; }
.text-button { border:0; padding:8px; color:#53617f; background:transparent; text-decoration:underline; cursor:pointer; font-weight:700; }
.toast { position:fixed; left:50%; bottom:max(24px,env(safe-area-inset-bottom)); z-index:20; transform:translate(-50%,24px); opacity:0; padding:13px 18px; border-radius:999px; background:#111b3f; color:#fff; box-shadow:0 14px 32px rgba(0,0,0,.25); transition:.25s ease; pointer-events:none; font-size:13px; font-weight:800; }
.toast.is-visible { opacity:1; transform:translate(-50%,0); }
.confetti { position:fixed; inset:0; pointer-events:none; z-index:30; overflow:hidden; }
.confetti i { position:absolute; top:-30px; width:10px; height:18px; border-radius:3px; animation:confettiFall 1.8s linear forwards; }
@keyframes confettiFall { to { transform:translate(var(--drift),110vh) rotate(720deg); } }
.error-page .app-shell { min-height:100vh; display:flex; flex-direction:column; }
.error-card { flex:1; display:grid; place-items:center; padding:48px 0 90px; text-align:center; }
.error-card-inner { width:min(620px,100%); padding:clamp(32px,7vw,68px); border:1px solid rgba(255,255,255,.18); border-radius:34px; background:rgba(255,255,255,.1); box-shadow:var(--shadow); backdrop-filter:blur(18px); }
.error-code { margin:0 0 12px; color:var(--cyan); font-size:13px; font-weight:900; letter-spacing:.2em; }
.error-card h1 { margin:0; font-size:clamp(42px,8vw,72px); letter-spacing:-.055em; }
.error-card .lead { margin:22px auto 30px; }
.primary-link { display:inline-flex; align-items:center; justify-content:center; min-height:58px; padding:0 28px; border-radius:999px; background:var(--yellow); color:#1a2450; box-shadow:0 16px 34px rgba(255,222,77,.22); font-size:17px; font-weight:900; text-decoration:none; transition:transform .18s ease,box-shadow .18s ease; }
.primary-link:hover { transform:translateY(-2px); box-shadow:0 20px 42px rgba(255,222,77,.32); }
@media (max-width: 800px) {
  .app-shell { width:min(100% - 24px, 680px); }
  .site-header { min-height:72px; }
  .start-screen, .start-screen.is-active { grid-template-columns:1fr; gap:34px; padding-top:28px; }
  .hero-copy { text-align:center; margin:0 auto; }
  .lead { margin-left:auto; margin-right:auto; }
  .preview-card { transform:none; min-height:410px; padding:24px; }
  .feature-strip { grid-template-columns:repeat(2,1fr); }
  .feature-strip div:nth-child(2) { border-right:0; }
  .feature-strip div:nth-child(-n+2) { border-bottom:1px solid rgba(255,255,255,.13); }
  .how-to { padding:28px 20px; }
  .how-to ol { grid-template-columns:1fr; }
  .game-screen { margin-top:20px; }
  .question-card { min-height:560px; }
}
@media (max-width: 520px) {
  .brand small { display:none; }
  h1 { font-size:45px; }
  .lead { font-size:15px; line-height:1.75; }
  .primary-button { width:100%; }
  .preview-sequence span,.preview-sequence b { border-radius:13px; font-size:21px; }
  .preview-options { grid-template-columns:repeat(2,1fr); }
  .feature-strip strong { font-size:28px; }
  .feature-strip span { font-size:11px; }
  .game-hud { grid-template-columns:1fr auto; gap:12px; }
  .timer { min-width:88px; padding:11px 12px; font-size:17px; }
  .question-card { min-height:540px; padding:25px 18px; border-radius:25px; }
  .question-visual { min-height:165px; margin:24px 0 20px; }
  .answer-button { min-height:62px; font-size:16px; }
  .logic-board { grid-template-columns:repeat(2,minmax(115px,1fr)); width:100%; }
  .logic-line { padding:14px 8px; font-size:19px; }
  .matrix-board { grid-template-columns:repeat(2,92px); }
  .matrix-cell { min-height:86px; }
  .shape { width:50px; height:50px; }
  .result-card { border-radius:26px; }
  .result-meta { grid-template-columns:1fr 1fr; }
  .result-meta div:last-child { grid-column:1/-1; }
  .ability-row { grid-template-columns:82px 1fr 38px; gap:8px; }
  .share-actions { grid-template-columns:1fr; }
  .share-actions .primary-button { grid-column:auto; }
  .primary-link { width:100%; }
}
@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; scroll-behavior:auto !important; }
}