:root {
  color-scheme: dark;
  --ink: #0c1110;
  --ink-soft: #131a18;
  --panel: rgba(18, 25, 23, 0.86);
  --paper: #f1eadc;
  --paper-soft: #d9d0bf;
  --muted: #8f9c96;
  --line: rgba(226, 215, 190, 0.16);
  --line-strong: rgba(226, 215, 190, 0.32);
  --brass: #d7ae68;
  --brass-light: #f0cd8b;
  --green: #7fa98e;
  --coral: #d97a61;
  --shadow: 0 32px 100px rgba(0, 0, 0, 0.45);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--ink);
  color: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--ink); }

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 70% 16%, rgba(87, 123, 102, 0.12), transparent 29rem),
    radial-gradient(circle at 7% 74%, rgba(215, 174, 104, 0.08), transparent 25rem),
    linear-gradient(135deg, #0b100f, #101715 60%, #0a0e0d);
}

button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; }

.ambient { position: fixed; inset: 0; pointer-events: none; overflow: hidden; }
.ambient::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.12;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.36'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(circle at 60% 40%, black, transparent 72%);
}
.orb { position: absolute; border-radius: 50%; filter: blur(1px); opacity: .45; }
.orb-one { width: 420px; height: 420px; top: -240px; right: 4%; border: 1px solid rgba(215,174,104,.14); box-shadow: inset 0 0 90px rgba(215,174,104,.04); }
.orb-two { width: 220px; height: 220px; left: -130px; bottom: 8%; border: 1px solid rgba(127,169,142,.16); }

.app-shell { position: relative; z-index: 1; width: min(1480px, 100%); min-height: 100vh; margin: 0 auto; padding: 28px clamp(20px, 4vw, 68px) 20px; display: flex; flex-direction: column; }

.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--brass); color: var(--brass-light); font: 600 12px/1 "Avenir Next", sans-serif; letter-spacing: .12em; transform: rotate(45deg); }
.brand-mark::after { content: "JQ"; transform: rotate(-45deg); }
.brand > span:last-child { display: flex; flex-direction: column; gap: 4px; }
.brand strong { font-size: 12px; letter-spacing: .2em; }
.brand small { color: var(--muted); font-size: 9px; letter-spacing: .12em; }
.header-actions { display: flex; align-items: center; gap: 18px; }
.icon-button { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: transparent; cursor: pointer; transition: .25s ease; }
.icon-button:hover { border-color: var(--brass); color: var(--brass-light); transform: translateY(-2px); }
.icon-button svg { width: 18px; fill: currentColor; }
.icon-button[aria-pressed="false"] .sound-on, .icon-button[aria-pressed="true"] .sound-off { display: none; }
.exit-link { color: var(--muted); font-size: 12px; letter-spacing: .08em; text-decoration: none; transition: color .2s ease; }
.exit-link:hover { color: var(--paper); }

.game-layout { flex: 1; display: grid; grid-template-columns: minmax(260px, 350px) minmax(0, 1fr); gap: clamp(36px, 6vw, 92px); align-items: center; padding: clamp(36px, 7vh, 78px) 0 52px; }
.control-panel { align-self: center; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; color: var(--brass); font-size: 10px; letter-spacing: .24em; }
.eyebrow span { width: 28px; height: 1px; background: var(--brass); }
.control-panel h1 { margin: 0; font-family: "Bodoni 72", "Songti SC", "STSong", serif; font-size: clamp(42px, 4.2vw, 68px); font-weight: 400; line-height: 1.06; letter-spacing: -.055em; }
.control-panel h1 em { color: var(--brass-light); font-style: italic; }
.intro { max-width: 32em; margin: 24px 0 32px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.option-group { margin: 0 0 24px; padding: 0; border: 0; }
.option-group legend { margin-bottom: 10px; color: var(--paper-soft); font-size: 10px; letter-spacing: .18em; }
.segmented { display: grid; grid-template-columns: repeat(3, 1fr); padding: 4px; border: 1px solid var(--line); border-radius: 4px; background: rgba(0,0,0,.16); }
.segmented button { padding: 10px 8px 9px; border: 0; border-radius: 2px; background: transparent; cursor: pointer; transition: .2s ease; }
.segmented button strong, .segmented button span { display: block; }
.segmented button strong { font-size: 12px; font-weight: 500; }
.segmented button span { margin-top: 4px; color: var(--muted); font-size: 9px; }
.segmented button[aria-pressed="true"] { color: var(--ink); background: var(--paper); box-shadow: 0 4px 18px rgba(0,0,0,.24); }
.segmented button[aria-pressed="true"] span { color: #65716b; }
.deck-options { display: grid; gap: 6px; }
.deck-options button { display: flex; align-items: center; gap: 14px; padding: 9px 12px; border: 1px solid transparent; border-radius: 3px; color: var(--muted); background: transparent; text-align: left; cursor: pointer; transition: .22s ease; }
.deck-options button span { width: 24px; color: #66736d; font: 9px/1 monospace; }
.deck-options button:hover { color: var(--paper); background: rgba(255,255,255,.025); }
.deck-options button[aria-pressed="true"] { color: var(--paper); border-color: var(--line); background: rgba(255,255,255,.035); }
.deck-options button[aria-pressed="true"] span { color: var(--brass); }
.daily-toggle { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 12px; margin: 28px 0 18px; cursor: pointer; }
.daily-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-track { width: 38px; height: 21px; padding: 3px; border: 1px solid var(--line-strong); border-radius: 20px; transition: .2s ease; }
.toggle-track span { display: block; width: 13px; height: 13px; border-radius: 50%; background: var(--muted); transition: .25s cubic-bezier(.2,.8,.2,1); }
.daily-toggle input:checked + .toggle-track { border-color: var(--brass); background: rgba(215,174,104,.15); }
.daily-toggle input:checked + .toggle-track span { transform: translateX(17px); background: var(--brass-light); }
.daily-toggle input:focus-visible + .toggle-track { outline: 2px solid var(--brass-light); outline-offset: 3px; }
.daily-toggle > span:last-child { display: flex; flex-direction: column; gap: 2px; }
.daily-toggle strong { font-size: 11px; font-weight: 500; }
.daily-toggle small { color: var(--muted); font-size: 9px; }
.primary-button { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 15px 17px; border: 1px solid var(--brass); border-radius: 3px; color: #171610; background: var(--brass-light); font-size: 12px; font-weight: 650; letter-spacing: .08em; cursor: pointer; transition: .25s ease; box-shadow: 0 10px 32px rgba(215,174,104,.12); }
.primary-button:hover { transform: translateY(-2px); background: #f7d99e; box-shadow: 0 15px 38px rgba(215,174,104,.2); }
.primary-button b { font-size: 18px; font-weight: 400; }
.personal-best { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 2px 12px; margin-top: 16px; padding: 12px 2px 0; border-top: 1px solid var(--line); }
.personal-best span { color: var(--muted); font-size: 9px; letter-spacing: .14em; }
.personal-best strong { grid-row: span 2; font-family: "Bodoni 72", serif; font-size: 27px; font-weight: 400; color: var(--paper-soft); }
.personal-best small { color: #68736e; font-size: 9px; }

.play-surface { min-width: 0; padding: clamp(20px, 3vw, 38px); border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(150deg, rgba(24,32,29,.92), rgba(12,17,16,.86)); box-shadow: var(--shadow), inset 0 1px rgba(255,255,255,.035); backdrop-filter: blur(20px); }
.surface-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; padding-bottom: 18px; }
.session-number { color: var(--brass); font: 9px/1 monospace; letter-spacing: .16em; }
.surface-head h2 { margin: 7px 0 0; font-family: "Songti SC", "STSong", serif; font-size: clamp(24px, 2.2vw, 34px); font-weight: 400; }
.surface-actions { display: flex; gap: 8px; }
.text-button { display: inline-flex; align-items: center; gap: 7px; padding: 8px 10px; border: 1px solid transparent; border-radius: 3px; color: var(--muted); background: transparent; font-size: 10px; cursor: pointer; transition: .2s ease; }
.text-button:hover:not(:disabled) { color: var(--paper); border-color: var(--line); }
.text-button:disabled { opacity: .35; cursor: not-allowed; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-bottom: 16px; border: 1px solid var(--line); border-width: 1px 0; }
.stats > div { padding: 13px 14px; border-right: 1px solid var(--line); }
.stats > div:last-child { border: 0; }
.stats span { display: block; margin-bottom: 5px; color: var(--muted); font-size: 8px; letter-spacing: .15em; }
.stats strong { font: 400 clamp(18px, 2vw, 25px)/1 "Bodoni 72", "Times New Roman", serif; font-variant-numeric: tabular-nums; }
.stats strong b { font-weight: 400; }
.stats strong small { margin-left: 4px; color: #68736e; font: 9px/1 monospace; }
.stats .is-hot strong { color: var(--brass-light); text-shadow: 0 0 20px rgba(215,174,104,.3); }
.board-frame { position: relative; min-height: 430px; display: grid; place-items: center; padding: clamp(17px, 3vw, 34px); border: 1px solid var(--line); background: radial-gradient(circle at 50% 42%, rgba(127,169,142,.07), transparent 54%), rgba(4,8,7,.28); overflow: hidden; }
.board-corners i { position: absolute; width: 14px; height: 14px; border-color: var(--brass); opacity: .45; }
.board-corners i:nth-child(1) { top: 9px; left: 9px; border-top: 1px solid; border-left: 1px solid; }
.board-corners i:nth-child(2) { top: 9px; right: 9px; border-top: 1px solid; border-right: 1px solid; }
.board-corners i:nth-child(3) { bottom: 9px; left: 9px; border-bottom: 1px solid; border-left: 1px solid; }
.board-corners i:nth-child(4) { right: 9px; bottom: 9px; border-right: 1px solid; border-bottom: 1px solid; }
.game-board { --columns: 4; width: min(100%, 670px); display: grid; grid-template-columns: repeat(var(--columns), minmax(0, 1fr)); gap: clamp(8px, 1.2vw, 14px); perspective: 1200px; }
.game-board[data-level="wander"] { max-width: 540px; }
.memory-card { position: relative; aspect-ratio: .79; min-width: 0; padding: 0; border: 0; border-radius: 7px; background: transparent; cursor: pointer; perspective: 800px; }
.memory-card:focus-visible { outline: 2px solid var(--brass-light); outline-offset: 4px; }
.card-inner { position: absolute; inset: 0; border-radius: inherit; transform-style: preserve-3d; transition: transform .55s cubic-bezier(.2,.75,.2,1); }
.memory-card.is-flipped .card-inner { transform: rotateY(180deg); }
.card-face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: clamp(7px, 1vw, 11px); border-radius: inherit; overflow: hidden; backface-visibility: hidden; }
.card-face i, .card-face small { align-self: stretch; color: rgba(241,234,220,.45); font: 7px/1.2 monospace; font-style: normal; letter-spacing: .1em; }
.card-face small { text-align: right; }
.card-face b { display: grid; place-items: center; width: 52%; aspect-ratio: 1; border: 1px solid rgba(215,174,104,.3); border-radius: 50%; color: var(--brass-light); font: 400 clamp(18px, 2.6vw, 35px)/1 serif; }
.card-back { border: 1px solid rgba(226,215,190,.23); background: linear-gradient(145deg, #26342e, #16201d 70%); box-shadow: 0 9px 20px rgba(0,0,0,.26), inset 0 0 0 4px rgba(255,255,255,.018); }
.card-back::before { content: ""; position: absolute; inset: 7px; border: 1px solid rgba(215,174,104,.12); border-radius: 3px; }
.card-back b { border-style: dashed; font-size: clamp(17px, 2vw, 28px); }
.card-front { transform: rotateY(180deg); border: 1px solid rgba(215,174,104,.55); background: linear-gradient(145deg, #efe7d8, #cfc3ae); box-shadow: 0 12px 30px rgba(0,0,0,.34); }
.card-front::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 70% 20%, rgba(255,255,255,.5), transparent 40%); pointer-events: none; }
.card-front i, .card-front small { position: relative; z-index: 1; color: rgba(46,48,41,.55); }
.card-front b { position: relative; z-index: 1; border-color: rgba(72,83,70,.25); background: rgba(255,255,255,.3); font-size: clamp(22px, 3.2vw, 44px); filter: saturate(.92); }
.memory-card:hover:not(:disabled):not(.is-flipped) .card-inner { transform: translateY(-5px) rotateX(2deg); }
.memory-card.is-matched { cursor: default; animation: matchPulse .72s ease; }
.memory-card.is-matched .card-front { border-color: var(--green); box-shadow: 0 0 0 1px rgba(127,169,142,.28), 0 12px 30px rgba(0,0,0,.3); }
.memory-card.is-matched .card-front::before { content: "✓"; position: absolute; z-index: 2; top: 7px; right: 8px; display: grid; place-items: center; width: 15px; height: 15px; border-radius: 50%; color: var(--paper); background: #527762; font: 9px/1 sans-serif; }
@keyframes matchPulse { 0%, 100% { transform: scale(1); } 42% { transform: scale(1.035); } }
.board-empty { text-align: center; color: var(--muted); }
.board-empty[hidden], .game-board[hidden] { display: none; }
.empty-emblem { display: grid; place-items: center; width: 80px; height: 80px; margin: 0 auto 18px; border: 1px solid var(--line); border-radius: 50%; color: var(--brass); font: 30px/1 serif; }
.board-empty p { margin: 0 0 7px; color: var(--paper-soft); font-family: "Songti SC", serif; font-size: 17px; }
.board-empty small { font-size: 10px; }
.pause-screen { position: absolute; z-index: 5; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; background: rgba(8,13,11,.94); backdrop-filter: blur(18px); text-align: center; }
.pause-screen[hidden] { display: none; }
.pause-screen > span { display: grid; place-items: center; width: 64px; height: 64px; margin-bottom: 18px; border: 1px solid var(--brass); border-radius: 50%; color: var(--brass); font: 20px/1 serif; }
.pause-screen strong { font-family: "Songti SC", serif; font-size: 22px; font-weight: 400; }
.pause-screen p { margin: 8px 0 20px; color: var(--muted); font-size: 11px; }
.pause-screen button { padding: 10px 26px; border: 1px solid var(--line-strong); border-radius: 3px; color: var(--paper); background: transparent; cursor: pointer; }
.surface-foot { display: flex; justify-content: space-between; gap: 22px; padding-top: 15px; color: #78847e; font-size: 9px; line-height: 1.5; }
.surface-foot p { display: flex; gap: 8px; margin: 0; }
.surface-foot p span:first-child { color: var(--brass); }
.site-footer { display: flex; justify-content: space-between; gap: 20px; padding-top: 17px; border-top: 1px solid var(--line); color: #56615c; font: 8px/1.4 monospace; letter-spacing: .12em; }

.result-dialog { width: min(520px, calc(100vw - 32px)); padding: 42px; border: 1px solid rgba(215,174,104,.36); border-radius: 8px; color: var(--paper); background: #121a17; box-shadow: 0 40px 120px rgba(0,0,0,.75); overflow: hidden; }
.result-dialog::backdrop { background: rgba(4,7,6,.78); backdrop-filter: blur(11px); }
.result-glow { position: absolute; width: 300px; height: 300px; top: -210px; right: -40px; border-radius: 50%; background: var(--brass); filter: blur(90px); opacity: .16; }
.dialog-close { position: absolute; z-index: 2; top: 14px; right: 16px; border: 0; color: var(--muted); background: transparent; font-size: 25px; cursor: pointer; }
.result-kicker { color: var(--brass); font: 9px/1 monospace; letter-spacing: .24em; }
.result-dialog h2 { margin: 12px 0 9px; font-family: "Bodoni 72", "Songti SC", serif; font-size: 38px; font-weight: 400; }
.result-dialog > p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.result-score { position: relative; margin: 28px 0 22px; padding: 24px 0; border: 1px solid var(--line); border-width: 1px 0; text-align: center; }
.result-score span { display: block; color: var(--muted); font-size: 8px; letter-spacing: .2em; }
.result-score strong { display: block; margin-top: 5px; color: var(--brass-light); font: 400 58px/1 "Bodoni 72", serif; letter-spacing: .04em; }
.result-score small { position: absolute; top: 12px; right: 0; padding: 4px 7px; border: 1px solid var(--brass); color: var(--brass); font: 7px/1 monospace; letter-spacing: .12em; transform: rotate(2deg); }
.result-score small.is-muted { border-color: var(--line); color: var(--muted); }
.result-metrics { display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 28px; }
.result-metrics div { text-align: center; border-right: 1px solid var(--line); }
.result-metrics div:last-child { border: 0; }
.result-metrics span { display: block; margin-bottom: 7px; color: var(--muted); font-size: 8px; }
.result-metrics strong { font: 400 21px/1 "Bodoni 72", serif; }
.dialog-actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.secondary-button { padding: 0 18px; border: 1px solid var(--line); border-radius: 3px; color: var(--paper-soft); background: transparent; font-size: 10px; cursor: pointer; }
.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; }

@media (max-width: 960px) {
  .game-layout { grid-template-columns: 1fr; align-items: start; }
  .control-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
  .control-panel .eyebrow, .control-panel h1, .control-panel .intro { grid-column: 1 / -1; }
  .control-panel h1 br { display: none; }
  .primary-button, .personal-best { grid-column: 1 / -1; }
  .daily-toggle { align-self: end; }
}

@media (max-width: 620px) {
  .app-shell { padding: 18px 14px 14px; }
  .site-header { padding-bottom: 17px; }
  .brand-mark { width: 35px; height: 35px; }
  .brand strong { font-size: 10px; }
  .brand small, .exit-link { display: none; }
  .game-layout { gap: 28px; padding: 34px 0; }
  .control-panel { display: block; }
  .control-panel h1 { font-size: 43px; }
  .control-panel h1 br { display: initial; }
  .intro { margin: 19px 0 25px; }
  .play-surface { padding: 15px; border-radius: 5px; }
  .surface-head { align-items: center; }
  .surface-head h2 { font-size: 23px; }
  .text-button { padding: 7px 5px; }
  .text-button span:last-child { display: none; }
  .stats > div { padding: 10px 7px; text-align: center; }
  .stats span { letter-spacing: .08em; }
  .stats strong { font-size: 18px; }
  .board-frame { min-height: 410px; padding: 20px 11px; }
  .game-board { gap: 7px; }
  .game-board[data-level="master"] { gap: 5px; }
  .card-face { padding: 6px; }
  .card-face i, .card-face small { font-size: 5px; }
  .card-front b { width: 64%; font-size: clamp(20px, 7vw, 31px); }
  .surface-foot { display: block; }
  .surface-foot > span { display: none; }
  .site-footer { display: block; text-align: center; }
  .site-footer span:last-child { display: none; }
  .result-dialog { padding: 34px 24px 25px; }
  .result-dialog h2 { font-size: 32px; }
  .dialog-actions { grid-template-columns: 1fr; }
  .secondary-button { min-height: 42px; }
}

@media (max-width: 380px) {
  .control-panel h1 { font-size: 38px; }
  .board-frame { min-height: 350px; }
  .play-surface { padding: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

@media (prefers-contrast: more) {
  :root { --line: rgba(241,234,220,.34); --line-strong: rgba(241,234,220,.62); }
  .card-back, .card-front { border-width: 2px; }
}