:root{
  --bg:#05060f;--cyan:#19e6ff;--magenta:#ff2bd6;--violet:#8b5cff;--gold:#ffd166;--text:#eef2ff;--muted:#8e97b8;
  --glass:rgba(10,12,30,.78);--font-d:'Orbitron','Noto Sans KR',sans-serif;--font-b:'Noto Sans KR','Orbitron',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--font-b);overflow:hidden;user-select:none;-webkit-user-select:none;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
body{background:radial-gradient(ellipse at 50% 30%,#14113a 0%,#05060f 70%)}
.hidden{display:none!important}
.screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:10;animation:fadeIn .3s ease;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.panel{width:min(92vw,520px);max-height:92vh;overflow:auto;background:var(--glass);backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:28px 26px;display:flex;flex-direction:column;gap:18px;align-items:center;text-align:center}
.panel h2{font-family:var(--font-d);font-weight:900;letter-spacing:.18em;font-size:1.3rem;background:linear-gradient(90deg,var(--cyan),var(--magenta));-webkit-background-clip:text;background-clip:text;color:transparent}
.panel-desc{color:var(--muted);font-size:.9rem}

.btn{font-family:var(--font-d);font-weight:700;letter-spacing:.12em;cursor:pointer;border:0;color:var(--text);padding:14px 30px;border-radius:999px;font-size:.95rem;transition:transform .12s,box-shadow .2s,filter .2s,opacity .2s;position:relative;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:10px}
.btn:active{transform:scale(.96)}
.btn:disabled{opacity:.35;cursor:default;transform:none}
.btn-primary{background:linear-gradient(135deg,var(--cyan),var(--violet) 55%,var(--magenta));box-shadow:0 10px 30px rgba(139,92,255,.45),0 0 0 1px rgba(255,255,255,.12) inset;color:#fff}
.btn-primary:hover{filter:brightness(1.12)}
.btn-primary small{font-size:.65rem;letter-spacing:.1em;opacity:.9;font-weight:500}
.btn-ghost{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn.small{padding:9px 16px;font-size:.72rem}
.btn.home{color:var(--cyan);border-color:rgba(25,230,255,.35)}
.btn.gold{color:var(--gold);border-color:rgba(255,209,102,.35)}
.btn-tutorial{background:linear-gradient(135deg,rgba(255,209,102,.18),rgba(255,209,102,.06));border:1px solid rgba(255,209,102,.5);color:var(--gold)}
.btn-tutorial:hover{background:rgba(255,209,102,.22)}
.btn-tutorial small{font-family:var(--font-b);font-weight:400;font-size:.7rem;letter-spacing:0;color:#ffe7b0}
.tut-first{color:var(--gold);font-size:.85rem;letter-spacing:.04em;margin-bottom:-8px;animation:bob 1.6s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}
.pulse{animation:pulse 1.8s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 10px 30px rgba(139,92,255,.45)}50%{box-shadow:0 10px 44px rgba(25,230,255,.7)}}

/* title */
.title-wrap{display:flex;flex-direction:column;align-items:center;gap:20px;text-align:center;padding:20px}
.logo{font-family:var(--font-d);font-weight:900;font-size:clamp(2.8rem,11vw,5.4rem);letter-spacing:.1em;line-height:1;display:flex;gap:.25em}
.logo-star{background:linear-gradient(180deg,#fff,var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 22px rgba(25,230,255,.5))}
.logo-link{background:linear-gradient(180deg,#fff,var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 22px rgba(255,209,102,.5))}
.tagline{color:var(--muted);letter-spacing:.2em;font-size:.85rem}
.title-sub{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.title-foot{color:var(--muted);font-size:.78rem;letter-spacing:.1em;margin-top:6px}
.version-tag{display:flex;gap:12px;align-items:center;justify-content:center}
.version-tag span{font-family:var(--font-d);font-size:.7rem;letter-spacing:.25em;color:var(--muted);opacity:.8}

/* free play */
.level-list{display:flex;flex-direction:column;gap:10px;width:100%}
.btn-level{flex-direction:column;gap:4px;width:100%;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:14px}
.btn-level b{font-size:1rem;letter-spacing:.2em}
.btn-level span{font-family:var(--font-b);font-weight:400;font-size:.78rem;color:var(--muted);letter-spacing:0}
.btn-level:hover{border-color:rgba(25,230,255,.5);background:rgba(25,230,255,.08)}

/* how to */
.howto{text-align:left;padding-left:22px;display:flex;flex-direction:column;gap:12px;font-size:.92rem;line-height:1.65;color:#d6dcf5}
.howto b{color:var(--text)} .howto .c{color:var(--cyan)} .howto .v{color:#c9b3ff}

/* beginner guide */
.guide{display:flex;flex-direction:column;gap:12px;width:100%;text-align:left}
.guide-row{display:flex;gap:14px;align-items:center;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:10px 12px;font-size:.88rem;line-height:1.6;color:#d6dcf5}
.guide-row b{color:var(--text)}
.g-ico{flex:0 0 74px;display:flex;align-items:center;justify-content:center;gap:4px}
.g-star{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;background:var(--cyan);color:#04121a;font-family:var(--font-d);font-weight:900;font-size:.95rem;box-shadow:0 0 14px rgba(25,230,255,.6)}
.g-star.s{width:24px;height:24px;font-size:.7rem}
.g-line{width:18px;height:3px;background:linear-gradient(90deg,var(--cyan),var(--magenta));border-radius:2px}
.g-x{color:#ff4d6d;font-size:1.6rem;font-weight:900}
.g-grav{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;border:2px solid var(--violet);color:#d9ccff;font-family:var(--font-d);font-weight:900;box-shadow:0 0 14px rgba(139,92,255,.6),inset 0 0 0 4px #0b0e24}
.g-win{color:var(--gold);font-size:1.6rem;text-shadow:0 0 14px rgba(255,209,102,.7)}
.g-tip{font-size:1.4rem}
.howto-btns{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}

/* tutorial box */
.tut-box{margin:0 12px 4px;background:rgba(255,209,102,.08);border:1px solid rgba(255,209,102,.35);border-radius:14px;padding:10px 14px}
.tut-head{display:flex;align-items:center;justify-content:space-between;gap:10px}
.tut-step{font-family:var(--font-d);font-size:.7rem;letter-spacing:.2em;color:var(--gold)}
.tut-text{margin-top:6px;font-size:.9rem;line-height:1.55;color:#fff3d6;white-space:pre-line}

/* game */
.screen.game{flex-direction:column;align-items:stretch;justify-content:stretch;gap:0}
.hud{display:flex;align-items:center;justify-content:space-between;padding:12px 16px 6px;gap:12px}
.hud-mode{font-family:var(--font-d);font-weight:700;letter-spacing:.14em;font-size:.78rem;color:var(--cyan)}
.hud-sub{font-size:.68rem;color:var(--muted);letter-spacing:.1em;margin-top:2px}
.hud-time{font-family:var(--font-d);font-weight:900;font-size:1.5rem;letter-spacing:.1em;min-width:5ch;text-align:center}
.hud-hints{font-family:var(--font-d);font-size:.8rem;letter-spacing:.1em;color:var(--gold);text-align:right;min-width:4ch}
#board-wrap{flex:1;min-height:0;position:relative}
#board{display:block;touch-action:none;position:absolute;inset:0}
.controls{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;padding:8px 12px 14px}

/* win */
.panel.result{gap:14px}
.result-title{font-family:var(--font-d);font-weight:900;font-size:1.5rem;letter-spacing:.14em;line-height:1.2;background:linear-gradient(90deg,var(--gold),#fff 50%,var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.result-mode{font-family:var(--font-d);font-size:.75rem;letter-spacing:.2em;color:var(--muted)}
.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;width:100%}
.result-grid div{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:10px 6px}
.result-grid label{display:block;font-family:var(--font-d);font-size:.6rem;letter-spacing:.2em;color:var(--muted)}
.result-grid b{font-family:var(--font-d);font-size:1.15rem;font-weight:900;display:block;margin-top:4px}
.result-streak{color:var(--gold);font-size:.85rem;letter-spacing:.06em}
.result-btns{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}

#toast{position:fixed;left:50%;bottom:92px;transform:translateX(-50%);background:rgba(10,12,30,.92);border:1px solid rgba(255,255,255,.14);color:var(--text);padding:10px 18px;border-radius:999px;font-size:.85rem;z-index:50;white-space:pre-line;text-align:center;max-width:90vw;pointer-events:none;animation:fadeIn .15s}

@media (max-width:640px){
  .btn{padding:14px 22px;font-size:.9rem;min-height:48px}
  .btn.small{padding:10px 14px;font-size:.72rem;min-height:42px}
  .hud{padding:10px 12px 4px}
  .hud-time{font-size:1.3rem}
  .result-grid{grid-template-columns:repeat(2,1fr)}
  .panel{padding:22px 18px}
}
@media (prefers-reduced-motion: reduce){ .pulse{animation:none} .screen{animation:none} }