:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#1c1c1a;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:calc(100vh - 48px);display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.home{font-size:13px;color:var(--ink-2);text-decoration:none}
.home:hover{color:var(--ink)}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer}
.btn:hover{background:var(--hover)}
.btn:disabled{opacity:.4;cursor:default}
.btn:disabled:hover{background:transparent}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.text-input{height:40px;padding:0 12px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font:inherit;font-size:14px;color:var(--ink)}
@media (max-width:640px){ .topbar{padding:14px 16px} }

/* ---------- 게임 공통 셸 ---------- */
.actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.btn--accent{background:var(--accent);color:#fff;border:none;font-weight:500}
.btn--accent:hover{background:var(--accent);filter:brightness(1.08)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.game{flex:1;display:flex;flex-wrap:wrap;align-items:stretch;min-height:0}
.stage{flex:999 1 420px;min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:40px 28px}
.side{flex:1 1 300px;min-width:0;max-width:100%;border-left:1px solid var(--line);background:var(--panel);padding:28px 24px 40px;display:flex;flex-direction:column;gap:28px}
.group{display:flex;flex-direction:column;gap:12px}
.group + .group{border-top:1px solid var(--line-3);padding-top:24px}
.rules{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--ink-2);line-height:1.6;counter-reset:rule}
.rules li{display:flex;gap:10px}
.rules li::before{counter-increment:rule;content:counter(rule,decimal-leading-zero);font-family:var(--mono);font-size:11px;color:var(--accent);padding-top:3px;flex-shrink:0}
.keys{display:flex;flex-direction:column;gap:8px;font-size:12px;color:var(--ink-2)}
.keys div{display:flex;justify-content:space-between;align-items:center;gap:12px}
.kbd{display:inline-block;font-family:var(--mono);font-size:11px;line-height:1.4;padding:1px 6px;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;background:var(--surface);color:var(--ink)}
.best-card{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:16px;border-radius:12px;background:var(--panel-soft)}
.best-val{font-family:var(--mono);font-size:28px;font-weight:500;letter-spacing:-.02em}
.seg{display:flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px}
.seg-btn{flex:1;height:30px;padding:0 10px;background:transparent;color:var(--sub);border:none;border-radius:999px;font-size:12px;cursor:pointer;white-space:nowrap}
.seg-btn.is-active{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.link-btn{padding:0;background:none;border:none;font-size:12px;color:var(--muted);text-decoration:underline;text-underline-offset:3px;cursor:pointer}
@media (max-width:640px){
  .stage{padding:24px 16px}
  .side{border-left:none;border-top:1px solid var(--line);padding:24px 16px 40px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* ---------- 스네이크 (도트 매트릭스 LCD) ---------- */
:root{--accent:#5f8f0a;--lcd:#9bbc0f;--lcd-2:#8bac0f;--lcd-3:#306230;--lcd-ink:#0f380f;--shell:#d9d6cf;--bezel:#4a4d57}
.console{width:min(100%,460px);padding:18px 18px 22px;border-radius:22px 22px 56px 22px;background:var(--shell);box-shadow:inset 0 -4px 0 rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.08),0 28px 50px -26px rgba(40,36,28,.45);display:flex;flex-direction:column;gap:12px}
.console-top{display:flex;align-items:center;gap:10px;padding:0 4px}
.power{width:8px;height:8px;border-radius:999px;background:#c9c5bd;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12)}
.app[data-state="running"] .power{background:#ff3b3b;box-shadow:0 0 8px #ff3b3b}
.console-name{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:#7d7a73;font-style:italic;font-weight:700}
.lcd-hud{display:flex;justify-content:space-between;padding:8px 12px;border-radius:8px 8px 0 0;background:var(--bezel);color:#b9bcc6;font-family:var(--mono);font-size:11px;letter-spacing:.14em;margin-bottom:-12px}
.lcd-hud b{color:#e9f5b3;font-weight:700;margin-left:6px;font-variant-numeric:tabular-nums}
.screen{position:relative;width:100%;aspect-ratio:1;padding:10px;border-radius:0 0 8px 8px;background:var(--bezel);touch-action:none;user-select:none;-webkit-user-select:none;cursor:pointer}
.screen canvas{display:block;width:100%;height:100%;border-radius:3px;background:var(--lcd);box-shadow:inset 0 0 18px rgba(15,56,15,.35)}
.screen-msg{position:absolute;inset:10px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;color:var(--lcd-ink);background:rgba(155,188,15,.72);border-radius:3px;padding:16px;pointer-events:none}
.screen-msg strong{font-family:var(--mono);font-size:clamp(26px,8vw,40px);font-weight:800;letter-spacing:.06em;line-height:1}
.screen-msg span{font-size:13px;font-weight:500}
.app[data-state="running"] .screen-msg{display:none}
.app[data-state="ready"] .screen-msg strong,.app[data-state="paused"] .screen-msg strong{animation:blink 1s steps(2) infinite}
.app[data-state="over"] .screen-msg{background:rgba(15,56,15,.78);color:var(--lcd)}
.app[data-state="over"] .screen{animation:shake .35s}

.pad{display:none;align-items:center;justify-content:space-between;padding:10px 6px 0;gap:16px}
.dpad{display:grid;grid-template-columns:repeat(3,48px);grid-template-rows:repeat(3,48px)}
.dpad-btn{border:none;background:#2a2c33;color:#6e7180;font-size:14px;cursor:pointer;touch-action:none;-webkit-tap-highlight-color:transparent;padding:0}
.dpad-btn:active,.dpad-btn.is-press{background:#14151a;color:var(--lcd)}
.dpad-btn.up{grid-area:1/2;border-radius:8px 8px 0 0}
.dpad-btn.left{grid-area:2/1;border-radius:8px 0 0 8px}
.dpad-btn.right{grid-area:2/3;border-radius:0 8px 8px 0}
.dpad-btn.down{grid-area:3/2;border-radius:0 0 8px 8px}
.dpad-center{grid-area:2/2;background:#2a2c33}
.ab{display:flex;align-items:center}
.ab-btn{width:72px;height:72px;border-radius:999px;border:none;background:#a3174a;color:#fff;box-shadow:inset 0 -4px 0 rgba(0,0,0,.25),0 3px 8px rgba(0,0,0,.2);cursor:pointer;-webkit-tap-highlight-color:transparent;transform:rotate(-20deg)}
.ab-btn span{font-family:var(--mono);font-size:10px;font-weight:700;letter-spacing:.1em}
.ab-btn:active{transform:rotate(-20deg) translateY(2px);box-shadow:inset 0 -2px 0 rgba(0,0,0,.25)}
.stage-hint{margin:0;font-size:13px;color:var(--muted);text-align:center}

.setting{display:flex;align-items:center;justify-content:space-between;gap:12px}
.setting .seg{flex:1;max-width:220px}
.setting-label{font-size:13px;color:var(--ink-2);display:flex;flex-direction:column;gap:2px}
.setting-label small{font-size:11px;color:var(--muted)}
.seg-btn.is-active{color:var(--accent);font-weight:700}
.switch{position:relative;cursor:pointer}
.switch input{position:absolute;opacity:0;width:1px;height:1px}
.switch-track{position:relative;flex-shrink:0;width:44px;height:26px;border-radius:999px;background:var(--track);transition:background .2s}
.switch-track::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:999px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.2);transition:transform .2s}
.switch input:checked + .switch-track{background:var(--accent)}
.switch input:checked + .switch-track::after{transform:translateX(18px)}
.switch input:focus-visible + .switch-track{outline:2px solid var(--accent);outline-offset:2px}
.side-note{margin:0;font-size:12px;color:var(--muted);line-height:1.6}
.best-label{font-size:13px;color:var(--ink-2)}

@keyframes blink{0%{opacity:1}100%{opacity:.15}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}50%{transform:translateX(6px)}75%{transform:translateX(-3px)}}
@media (max-width:860px),(pointer:coarse){ .pad{display:flex} }
@media (max-width:640px){
  .console{padding:14px 14px 18px;border-radius:18px 18px 44px 18px}
  .stage-hint{display:none}
}

/* 다크 모드 (인쇄는 라이트 그대로) — LCD 화면 색은 게임 화면이라 그대로 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#141318; --surface:#1a1920; --panel:#1f1e26; --panel-soft:#24232c;
    --ink:#ecebf0; --ink-hover:#ffffff; --ink-2:#c9c7d1; --sub:#a09eab; --muted:#8a8895;
    --line:#2e2d36; --line-2:#393843; --line-3:#26252d; --hover:#2a2932; --soft:#26252d; --track:#34333d;
    --accent:#9bc53d; --accent-soft:rgba(155,197,61,.16);
    --shell:#2c2b33;
  }
  :root[data-theme="dark"] .btn--solid,
  :root[data-theme="dark"] .btn--accent{color:var(--bg)}
  :root[data-theme="dark"] .seg-btn.is-active{background:var(--track);box-shadow:0 1px 3px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .console{box-shadow:inset 0 -4px 0 rgba(0,0,0,.25),0 0 0 1px #3a3942,0 28px 50px -26px rgba(0,0,0,.7)}
  :root[data-theme="dark"] .power{background:#45444d}
  :root[data-theme="dark"] .console-name{color:#8f8d98}
  :root[data-theme="dark"] .dpad-btn,:root[data-theme="dark"] .dpad-center{background:#1b1c21;color:#7d8090}
  :root[data-theme="dark"] .dpad-btn:active,:root[data-theme="dark"] .dpad-btn.is-press{background:#0e0f12}
  :root[data-theme="dark"] .switch-track::after{background:var(--ink)}
  :root[data-theme="dark"] .screen canvas,:root[data-theme="dark"] .screen-msg{filter:brightness(.8)}
}