:root{
  --bg:#11151b;--panel:#1b212a;--panel2:#252d38;--text:#eef3f8;--muted:#9ca9b7;
  --accent:#ff7a3d;--accent2:#ffd35a;--line:#394452;--danger:#ff4d62;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:radial-gradient(circle at 50% 0,#27303b 0,#141920 46%,#0c0f13 100%);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans JP",sans-serif}
body{min-height:100vh;min-height:100svh;overflow-x:hidden;overscroll-behavior:none}
button,input{font:inherit}button{color:inherit}
.screen{display:none;min-height:100vh;min-height:100svh}
.screen.active{display:flex}

/* title */
.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}
.title-card{margin:auto;width:min(860px,96vw);padding:18px 20px 16px;text-align:center}
.eyebrow{font-size:11px;letter-spacing:.20em;color:var(--accent2);font-weight:800;margin-bottom:4px}
.title-logo{margin:4px auto 10px}
.title-logo-image{display:block;width:min(560px,74vw);max-width:100%;height:auto;margin:0 auto;filter:drop-shadow(0 12px 20px #0007)}
.lead{color:#c8d0d9;margin:0 auto 14px;max-width:680px;font-size:14px}
.mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.mode-card{background:linear-gradient(180deg,#242c36,#171c23);border:1px solid #3b4654;border-radius:22px;padding:14px;min-height:220px;cursor:pointer;transition:.18s transform,.18s border-color,.18s background,.18s box-shadow;position:relative;overflow:hidden}
@media(hover:hover){.mode-card:hover{transform:translateY(-3px);border-color:#6b7b8e;background:linear-gradient(180deg,#2b3541,#1a2028)}}
.mode-card strong{display:block;font-size:22px;line-height:1.15}.mode-card small{display:block;color:var(--muted);margin-top:6px}
.mode-art{height:136px;position:relative;margin-bottom:10px;overflow:hidden;border-radius:16px;background:#10161d;box-shadow:inset 0 0 0 1px #ffffff10}
.mode-illustration{width:100%;height:100%;object-fit:cover;display:block}
.mode-card.starting{border-color:#ffd27d;box-shadow:0 0 0 2px #ffd27d66,0 0 24px #ff8bb088;animation:selectBlink .16s linear infinite alternate}
.mode-card.starting::after{content:"START!";position:absolute;right:12px;top:12px;background:linear-gradient(180deg,#fff4a8,#ffb45f);color:#5d2600;font-weight:900;border-radius:999px;padding:6px 12px;box-shadow:0 4px 0 #914d15}
@keyframes selectBlink{from{filter:brightness(1)}to{filter:brightness(1.18)}}
.title-actions{display:flex;justify-content:center;align-items:center;gap:18px;margin-top:12px;flex-wrap:wrap}
.secondary,.hud-btn,.icon-btn{border:1px solid #485463;background:#222a34;border-radius:10px;padding:10px 16px;cursor:pointer}
.sound-toggle{color:#c9d2dc}.version{color:#718092;font-size:12px;margin-top:10px}

.bg-picker{display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;margin:-4px auto 18px;max-width:820px}.bg-picker label{font-weight:800;color:#e7eef7}.bg-picker select{min-width:min(420px,84vw);background:#202833;border:1px solid #435163;color:#eef3f8;border-radius:12px;padding:10px 14px}.bg-picker small{color:#9ca9b7}.statusbar #sceneLabel{color:#ffd5ec;font-weight:700}
/* game shell */
#gameScreen{flex-direction:column;align-items:center;min-width:0}
.hud{width:100%;height:68px;padding:8px max(14px,env(safe-area-inset-right)) 8px max(14px,env(safe-area-inset-left));background:#11171ef2;border-bottom:1px solid #2d3742;display:flex;align-items:center;justify-content:space-between;gap:10px;position:fixed;top:0;left:0;z-index:4;backdrop-filter:blur(10px)}
.hud-left{display:flex;align-items:center;gap:10px;min-width:0}.hud-label{font-size:10px;color:#8694a3;display:block}.hud-left strong{font-size:14px;white-space:nowrap}.icon-btn{width:44px;height:44px;padding:0;font-size:22px;flex:0 0 auto}
.score-group{display:flex;gap:8px}.score-group>div{min-width:88px;padding:5px 10px;border-left:1px solid #394451}.score-group span{display:block;color:#8f9ca9;font-size:10px}.score-group strong{font-size:18px}
.game-wrap{position:relative;margin:68px auto 0;background:#0f1419;max-width:100vw;min-width:0;transition:width .15s ease}
.game-wrap canvas{display:block;width:100%;height:auto;max-width:100%;touch-action:none;background:#0f1419}
.message{position:absolute;left:50%;top:35%;transform:translate(-50%,-50%);pointer-events:none;text-align:center;white-space:pre-line;text-shadow:0 2px 8px #000;font-weight:900;font-size:clamp(24px,5vw,52px);opacity:0;transition:.25s;z-index:3}.message.show{opacity:1}
.mobile-controls{display:none;position:absolute;left:50%;bottom:max(10px,env(safe-area-inset-bottom));transform:translateX(-50%);gap:12px;z-index:3}
.mobile-controls button{width:72px;height:54px;border:1px solid #ffffff55;border-radius:16px;background:#0d141bd9;font-weight:900;backdrop-filter:blur(6px);touch-action:manipulation}.mobile-controls .drop{width:108px;background:#a9382fe8}
.statusbar{width:min(100vw,1200px);margin:0 auto;padding:10px 16px max(14px,env(safe-area-inset-bottom));color:#a9b4bf;font-size:16px;line-height:1.45;display:flex;gap:24px;justify-content:center;flex-wrap:wrap}.keys{opacity:.8}

dialog{border:1px solid #4b5968;border-radius:18px;background:#192029;color:#eef3f8;max-width:640px;width:calc(100% - 30px);box-shadow:0 18px 70px #0009}dialog::backdrop{background:#000b}.dialog-body{padding:18px 24px 22px;position:relative}.dialog-body h2{margin:0 0 14px}.dialog-body p,.dialog-body li{line-height:1.7;color:#cdd5de}.dialog-close{position:absolute;right:10px;top:10px;border:0;background:transparent;color:#dce5ee;font-size:26px;cursor:pointer}.tip{border-left:4px solid var(--accent);padding-left:12px}

/* portrait phones / narrow windows */
@media (max-width:720px), (orientation:portrait) and (max-width:900px){
  .title-card{padding:14px 12px 16px}.title-logo-image{width:min(500px,86vw)}.lead{margin-bottom:12px;font-size:13px}.bg-picker{gap:8px;margin-bottom:12px}.bg-picker select{width:100%;min-width:0}.bg-picker small{width:100%}
  .mode-grid{grid-template-columns:1fr;gap:12px}.mode-card{min-height:184px;padding:12px}.mode-art{height:128px;margin-bottom:9px}.mode-card strong{font-size:20px}
  .hud{height:64px;padding:5px 7px}.game-wrap{margin-top:64px}.icon-btn{width:40px;height:40px}.hud-left strong{font-size:11px;max-width:120px;overflow:hidden;text-overflow:ellipsis}.score-group{gap:2px}.score-group>div{min-width:55px;padding:3px 5px}.score-group strong{font-size:14px}.score-group span{font-size:9px}.hud-btn{padding:7px 8px;font-size:12px}
  .mobile-controls{display:flex}.statusbar{font-size:14px;gap:14px;padding:8px 10px max(10px,env(safe-area-inset-bottom))}.keys{display:none}
}

/* landscape phones: prioritize the game field */
@media (orientation:landscape) and (max-height:650px){
  .title-card{padding:10px 12px}.title-logo{margin:0 auto 6px}.title-logo-image{width:min(390px,48vw)}.eyebrow,.lead{display:none}.bg-picker{margin:2px auto 8px}.bg-picker small{display:none}.bg-picker select{padding:7px 10px}.mode-grid{gap:10px}.mode-card{min-height:140px;padding:9px 10px}.mode-art{height:78px;margin-bottom:4px}.mode-card strong{font-size:16px}.mode-card small{font-size:11px;margin-top:3px}.title-actions{margin-top:8px}.version{margin-top:5px}
  .hud{height:50px;padding:3px max(7px,env(safe-area-inset-right)) 3px max(7px,env(safe-area-inset-left))}.game-wrap{margin-top:50px}.icon-btn{width:38px;height:38px}.hud-label{display:none}.hud-left strong{display:none}.score-group>div{min-width:52px;padding:2px 5px}.score-group strong{font-size:13px}.score-group span{font-size:8px}.hud-btn{font-size:11px;padding:6px 8px}.statusbar{display:none}
  .mobile-controls{display:flex;bottom:max(6px,env(safe-area-inset-bottom));gap:8px}.mobile-controls button{height:44px;width:60px;border-radius:13px}.mobile-controls .drop{width:92px}
}

@media (hover:none), (pointer:coarse){.mobile-controls{display:flex}}


/* game over window */
.gameover-overlay{position:absolute;inset:0;display:none;align-items:center;justify-content:center;background:#05070aa8;z-index:8;padding:18px;backdrop-filter:blur(4px)}
.gameover-overlay.show{display:flex}.gameover-window{width:min(720px,92%);display:grid;grid-template-columns:minmax(180px,.78fr) minmax(260px,1.22fr);gap:22px;align-items:center;background:linear-gradient(145deg,#201922,#0e1015 72%);border:3px solid #f4b6d0;border-radius:24px;padding:18px;box-shadow:0 24px 70px #000b,0 0 0 2px #ffffff22 inset}.gameover-face{border-radius:18px;overflow:hidden;background:#251b22;border:2px solid #ffffff30;aspect-ratio:1/1}.gameover-face img{width:100%;height:100%;object-fit:cover;display:block}.gameover-copy{text-align:center;min-width:0}.gameover-copy h2{margin:0 0 8px;color:#ff78ae;font-size:clamp(34px,5vw,58px);letter-spacing:.04em;text-shadow:0 3px 0 #6c173d,0 6px 18px #000}.gameover-copy p{white-space:pre-line;line-height:1.65;color:#f2e9ef;font-size:clamp(15px,2vw,20px);margin:0 0 16px}.retry-btn,.gameover-title-btn{display:block;width:min(300px,100%);margin:9px auto 0;border-radius:14px;padding:12px 18px;font-weight:900;cursor:pointer}.retry-btn{border:2px solid #ffd2e4;background:linear-gradient(#ff5b9a,#d92f70);box-shadow:0 5px 0 #891c46;color:#fff;font-size:20px}.gameover-title-btn{border:1px solid #657181;background:#272f39;color:#e8edf4;font-size:14px}

/* how-to illustration layout */
#howDialog{max-width:980px;width:min(980px,calc(100% - 24px))}.how-layout{display:grid;grid-template-columns:minmax(260px,.9fr) minmax(320px,1.1fr);gap:20px;align-items:stretch}.how-visual{min-height:430px;border-radius:16px;overflow:hidden;background:#10151b;box-shadow:inset 0 0 0 1px #ffffff22}.how-visual img{width:100%;height:100%;object-fit:cover;display:block}.how-copy{min-width:0}.how-copy h2{font-size:28px;margin:0 0 12px}.how-copy ul{padding-left:1.25em;margin:10px 0}.how-copy li{margin-bottom:6px}
@media(max-width:760px){#howDialog{width:calc(100% - 14px)}.how-layout{grid-template-columns:1fr;gap:12px}.how-visual{min-height:0;aspect-ratio:16/10}.how-copy h2{font-size:24px}.dialog-body{padding:14px}.dialog-body p,.dialog-body li{font-size:13px;line-height:1.55}}

@media(max-width:640px){.gameover-overlay{padding:10px}.gameover-window{grid-template-columns:120px 1fr;gap:12px;padding:12px;border-radius:18px}.gameover-copy h2{font-size:30px}.gameover-copy p{font-size:13px;line-height:1.45;margin-bottom:10px}.retry-btn{font-size:16px;padding:9px}.gameover-title-btn{font-size:12px;padding:8px}.gameover-face{border-radius:14px}}
@media(max-width:430px),(orientation:portrait) and (max-width:560px){.gameover-window{grid-template-columns:1fr;width:min(360px,96%)}.gameover-face{width:150px;margin:auto}.gameover-copy h2{font-size:34px}}