/* ===================================================
   GRAVITY SWAP — style.css
   =================================================== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --void:#04030a; --surface:#0c0b18;
  --border:rgba(130,70,240,0.35); --border-h:rgba(200,100,255,0.75);
  --energy:#b060ff; --rift:#ff4adb; --cyan:#40ffee; --gold:#ffd060;
  --text:#e8dcff; --text-m:#a890d0; --text-s:#9880c8;
  --fh:'Oxanium',sans-serif; --fb:'Rajdhani',sans-serif;
  --muted:#7060a8;
}
html,body{width:100%;height:100%;overflow:hidden;background:var(--void);color:var(--text);font-family:var(--fb)}
body::before{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse 80% 55% at 50% -10%,rgba(176,96,255,.10) 0%,transparent 55%),
    radial-gradient(ellipse 55% 45% at 5% 100%,rgba(255,74,219,.08) 0%,transparent 50%),
    radial-gradient(ellipse 50% 60% at 98% 50%,rgba(64,255,238,.05) 0%,transparent 50%)}

/* SCREENS */
.screen{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:1}
.screen.active{display:flex}
.screen.overlay{background:rgba(4,3,10,.88);backdrop-filter:blur(10px) saturate(1.5);z-index:100}

/* START SCREEN */
#start-screen{flex-direction:column}
.start-content{display:flex;flex-direction:column;align-items:center;gap:28px;position:relative;z-index:2}
.logo-wrap{text-align:center}
.logo-eyebrow{font-family:var(--fh);font-size:clamp(10px,1.8vw,13px);letter-spacing:.5em;color:var(--rift);text-shadow:0 0 10px var(--rift);margin-bottom:10px}
.logo-main{font-family:var(--fh);font-size:clamp(52px,9vw,96px);font-weight:800;line-height:1;letter-spacing:.06em;
  background:linear-gradient(135deg,#fff 0%,var(--cyan) 30%,var(--energy) 65%,var(--rift) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  filter:drop-shadow(0 0 22px rgba(176,96,255,.55)) drop-shadow(0 0 44px rgba(255,74,219,.2));
  animation:logoFlicker 6s ease infinite}
@keyframes logoFlicker{
  0%,91%,100%{filter:drop-shadow(0 0 22px rgba(176,96,255,.55)) drop-shadow(0 0 44px rgba(255,74,219,.2))}
  93%{filter:drop-shadow(0 0 36px rgba(176,96,255,1)) drop-shadow(0 0 70px rgba(64,255,238,.5))}
  95%{filter:drop-shadow(0 0 12px rgba(176,96,255,.3))}
  97%{filter:drop-shadow(0 0 30px rgba(176,96,255,.85)) drop-shadow(0 0 55px rgba(255,74,219,.3))}}
.logo-crack{height:12px;width:100%;margin-top:8px;display:flex;align-items:center;justify-content:center}
.logo-crack::before,.logo-crack::after{content:'';flex:1;height:1px}
.logo-crack::before{background:linear-gradient(90deg,transparent,var(--energy))}
.logo-crack::after{background:linear-gradient(270deg,transparent,var(--rift))}
.crack-center{width:80px;height:10px;flex-shrink:0;pointer-events:none;
  clip-path:polygon(0%50%,18%0%,42%50%,58%5%,82%50%,100%50%,82%100%,55%55%,30%100%,12%50%);
  background:linear-gradient(90deg,var(--energy),var(--rift))}
.tagline{font-family:var(--fb);font-size:clamp(12px,2vw,15px);color:#c0b0e8;letter-spacing:.22em}
.difficulty-select{text-align:center}
.diff-label{font-family:var(--fh);font-size:11px;font-weight:600;letter-spacing:.35em;color:#c8b8f0;margin-bottom:12px}
.diff-buttons{display:flex;gap:6px}
.diff-btn{font-family:var(--fh);font-size:11px;font-weight:600;letter-spacing:.12em;padding:8px 18px;
  background:rgba(176,96,255,.05);border:1px solid var(--border);color:var(--text-m);cursor:pointer;transition:all .2s}
.diff-btn:hover,.diff-btn.active{border-color:var(--energy);color:var(--energy);background:rgba(176,96,255,.13);
  text-shadow:0 0 8px var(--energy);box-shadow:0 0 16px rgba(176,96,255,.28)}
.start-btn{font-family:var(--fh);font-size:clamp(16px,3vw,22px);font-weight:800;letter-spacing:.35em;padding:16px 72px;
  background:rgba(176,96,255,.1);border:1px solid var(--energy);color:#fff;cursor:pointer;
  position:relative;overflow:hidden;isolation:isolate;transition:all .25s}
.start-btn::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,var(--energy),var(--rift));
  opacity:0;transition:opacity .2s;z-index:-1;pointer-events:none}
.start-btn:hover::before{opacity:.22}
.start-btn:hover{border-color:var(--rift);text-shadow:0 0 18px rgba(255,255,255,.9);
  box-shadow:0 0 36px rgba(176,96,255,.45),0 0 70px rgba(255,74,219,.18)}
.start-btn:active{transform:scale(.97)}

/* GAME SCREEN LAYOUT
   Goal: field fills as much of the viewport height as possible.
   [left-panel 120px] [canvas-area flex:1] [right-panel 120px]
*/
#game-screen{flex-direction:column;background:var(--void);overflow:hidden}

#game-layout{
  display:flex;
  flex-direction:row;
  align-items:stretch;
  flex:1;
  min-height:0;
  width:100%;
  gap:0;
  padding:8px;
  justify-content:center;
}

#canvas-area{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}

#canvas-wrap{position:relative}
#canvas-wrap::before{content:'';position:absolute;inset:-1px;
  background:linear-gradient(135deg,var(--energy),var(--rift) 50%,var(--cyan));
  z-index:-1;opacity:.35;animation:borderPulse 3.5s ease infinite}
#canvas-wrap::after{content:'';position:absolute;inset:0;
  box-shadow:inset 0 0 40px rgba(176,96,255,.07),0 0 40px rgba(176,96,255,.12);
  pointer-events:none;z-index:10}
@keyframes borderPulse{0%,100%{opacity:.25}50%{opacity:.6}}
#game-canvas{display:block;image-rendering:pixelated}

/* overlay elements inside canvas */
.chain-display{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:10}
.levelup-display{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:10}
.gravity-flash{position:absolute;inset:0;pointer-events:none;z-index:20;opacity:0}

/* SIDE PANELS */
.side-panel{display:flex;flex-direction:column;gap:8px;width:120px;flex-shrink:0;padding:0 6px}
.panel-box{background:var(--surface);border:1px solid var(--border);padding:10px 10px 12px;text-align:center;position:relative;overflow:hidden}
.panel-box::before{content:'';position:absolute;top:0;right:0;width:0;height:0;border-style:solid;
  border-width:0 10px 10px 0;border-color:transparent var(--void) transparent transparent;pointer-events:none}
.panel-box::after{content:'';position:absolute;bottom:0;left:0;width:2px;height:40%;
  background:linear-gradient(to top,var(--energy),transparent);opacity:.55;pointer-events:none}
.panel-label{font-family:var(--fh);font-size:9px;font-weight:600;letter-spacing:.3em;color:#b8a8e0;margin-bottom:8px}
.panel-value{font-family:var(--fh);font-size:clamp(18px,2.5vw,26px);font-weight:800;color:var(--gold);text-shadow:0 0 10px var(--gold);word-break:break-all}
.grav-indicator{padding:4px 0}
.grav-indicator span{font-size:32px;display:inline-block;color:var(--rift);
  text-shadow:0 0 16px var(--rift),0 0 40px rgba(255,74,219,.35);
  animation:gravPulse 2.5s ease infinite;transition:transform .4s cubic-bezier(.34,1.56,.64,1)}
@keyframes gravPulse{0%,100%{text-shadow:0 0 16px var(--rift)}50%{text-shadow:0 0 22px var(--rift),0 0 55px rgba(255,74,219,.55)}}
#next-canvas{display:block;margin:0 auto}

/* CHAIN / LEVELUP / FLASH */
.chain-display.show{animation:chainPop .7s cubic-bezier(.22,1,.36,1) forwards}
@keyframes chainPop{
  0%{opacity:0;transform:scale(.3) skewX(-12deg);filter:blur(4px)}
  25%{opacity:1;transform:scale(1.2) skewX(-3deg);filter:blur(0)}
  50%{opacity:1;transform:scale(.98) skewX(1deg)}
  70%{opacity:1;transform:scale(1)}
  100%{opacity:0;transform:scale(.9) translateY(-14px);filter:blur(2px)}}
.chain-text{font-family:var(--fh);font-weight:800;font-size:clamp(26px,7vw,52px);letter-spacing:.1em;position:relative}
.chain-text::before,.chain-text::after{content:attr(data-text);position:absolute;top:0;left:0;pointer-events:none}
.chain-text::before{transform:translate(-3px,1px);filter:blur(.5px);opacity:.6}
.chain-text::after{transform:translate(3px,-1px);filter:blur(.5px);opacity:.4}
.chain-text.c1{color:#fff;text-shadow:0 0 16px #fff}
.chain-text.c1::before{color:var(--cyan)}.chain-text.c1::after{color:var(--rift)}
.chain-text.c2{color:var(--cyan);text-shadow:0 0 32px var(--cyan)}
.chain-text.c3{color:var(--gold);text-shadow:0 0 32px var(--gold)}
.chain-text.c4{color:var(--rift);text-shadow:0 0 24px var(--rift),0 0 60px rgba(255,74,219,.5)}
.chain-text.c5{color:#fff;text-shadow:0 0 20px #fff,0 0 40px var(--energy),0 0 80px var(--rift);animation:dimBreak .3s linear infinite}
@keyframes dimBreak{0%{filter:hue-rotate(0deg) brightness(1.3)}100%{filter:hue-rotate(360deg) brightness(1.3)}}
.levelup-display.show{animation:riftOpen .9s ease none}
@keyframes riftOpen{0%{opacity:0;transform:scaleX(.2) scaleY(1.4)}30%{opacity:1;transform:scaleX(1.05) scaleY(.95)}60%{opacity:1;transform:scale(1)}100%{opacity:0;transform:translateY(-16px)}}
.levelup-text{font-family:var(--fh);font-weight:800;font-size:clamp(20px,4.5vw,34px);letter-spacing:.15em;color:var(--gold);text-shadow:0 0 16px var(--gold)}
.gravity-flash.flash{animation:dimensionRift .7s ease forwards}
@keyframes dimensionRift{
  0%{opacity:0}
  8%{opacity:1;background:radial-gradient(ellipse at 50% 50%,rgba(255,255,255,.25) 0%,transparent 40%),radial-gradient(ellipse at 20% 80%,rgba(255,74,219,.3) 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,rgba(64,255,238,.25) 0%,transparent 50%)}
  25%{opacity:.7;background:radial-gradient(ellipse at 50% 50%,rgba(176,96,255,.2) 0%,transparent 60%)}
  60%{opacity:.3;background:rgba(176,96,255,.04)}
  100%{opacity:0}}

/* TOUCH CONTROLS */
#touch-controls{display:none;width:100%;padding:6px 10px 10px;flex-shrink:0;justify-content:center;gap:6px;align-items:center}
.touch-btn{font-family:var(--fh);font-size:14px;font-weight:700;background:var(--surface);border:1px solid var(--border);color:var(--text);
  width:52px;height:52px;cursor:pointer;transition:all .1s;user-select:none;-webkit-user-select:none;
  touch-action:manipulation;display:flex;align-items:center;justify-content:center}
.touch-btn.large{width:60px;height:60px;font-size:20px}
.touch-btn:active{background:rgba(176,96,255,.25);color:var(--energy);border-color:var(--energy);box-shadow:0 0 16px rgba(176,96,255,.4);transform:scale(.94)}
#pause-btn{font-size:18px;background:var(--surface);border:1px solid var(--border);
  color:var(--text);width:100%;height:36px;border-radius:8px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:all .15s}
#pause-btn:hover{border-color:var(--energy);color:var(--energy)}
.pause-box{padding:4px 0!important}

/* OVERLAYS */
.overlay-box{display:flex;flex-direction:column;align-items:center;gap:14px;padding:40px 48px;
  background:var(--surface);border:1px solid var(--border-h);min-width:300px;
  box-shadow:0 0 70px rgba(0,0,0,.95),0 0 40px rgba(176,96,255,.12);position:relative}
.overlay-box::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent 5%,var(--energy) 40%,var(--rift) 60%,transparent 95%);pointer-events:none}
.overlay-title{font-family:var(--fh);font-size:clamp(22px,5vw,34px);font-weight:800;letter-spacing:.2em;color:var(--rift);text-shadow:0 0 16px var(--rift),0 0 50px rgba(255,74,219,.3)}
.score-label{font-family:var(--fh);font-size:11px;font-weight:600;letter-spacing:.35em;color:#d0c0f8}
.final-score{font-family:var(--fh);font-size:clamp(38px,8vw,56px);font-weight:800;color:var(--gold);text-shadow:0 0 32px var(--gold)}
.new-record{font-family:var(--fh);font-size:13px;font-weight:700;letter-spacing:.2em;color:var(--cyan);text-shadow:0 0 16px var(--cyan);animation:riftPulse .7s ease infinite alternate}
.new-record.hidden{display:none}
@keyframes riftPulse{from{opacity:.6}to{opacity:1;text-shadow:0 0 32px var(--cyan)}}
.ranking-list{width:100%}
.ranking-item{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid rgba(130,70,240,.18);font-family:var(--fb);font-size:13px}
.ranking-item.current{color:var(--cyan)}
.rank-score{font-weight:700}
.menu-btn{font-family:var(--fh);font-size:13px;font-weight:700;letter-spacing:.2em;padding:12px 32px;
  background:rgba(176,96,255,.05);border:1px solid rgba(130,70,240,.4);
  color:var(--text);cursor:pointer;width:100%;transition:all .2s;position:relative}
.menu-btn:hover{border-color:var(--energy);color:var(--energy);background:rgba(176,96,255,.1);text-shadow:0 0 8px var(--energy);box-shadow:0 0 16px rgba(176,96,255,.22)}
.menu-btn.primary{border-color:var(--rift);color:var(--rift);text-shadow:0 0 8px var(--rift);box-shadow:0 0 20px rgba(255,74,219,.2)}
.menu-btn.primary:hover{background:rgba(255,74,219,.1);box-shadow:0 0 30px rgba(255,74,219,.38)}
.menu-btn:active{transform:scale(.97)}

/* RESPONSIVE */
@media(max-width:700px){
  #game-layout{gap:2px;padding:2px}
  .side-panel{width:72px}
  .panel-box{padding:4px 4px 6px}
  .panel-label{font-size:7px;margin-bottom:3px}
  .panel-value{font-size:15px}
  #next-canvas{width:64px!important;height:190px!important}
  .grav-indicator span{font-size:22px}
  #touch-controls{display:flex}

}
@media(max-width:420px){
  #game-layout{gap:1px;padding:1px}
  .side-panel{width:52px}
  .panel-label{font-size:6px}
  .panel-value{font-size:13px}
  #next-canvas{width:46px!important;height:140px!important}
  .touch-btn{width:52px;height:52px;font-size:16px}
  .touch-btn.large{width:58px;height:58px;font-size:22px}
}
@media(orientation:landscape) and (max-height:500px){
  #touch-controls{display:none!important}
  #game-layout{padding:2px;gap:4px}
}

/* ===== PLAYER ROW ===== */
.player-row{display:flex;align-items:center;gap:8px;justify-content:center;margin:10px 0 14px}
.player-name-text{font-family:var(--fh);font-size:20px;font-weight:700;color:var(--energy);
  text-shadow:0 0 12px var(--energy);letter-spacing:.1em}
.icon-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--border);
  background:var(--surface);color:var(--text);font-size:18px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:all .15s}
.icon-btn:hover{border-color:var(--energy);color:var(--energy);box-shadow:0 0 10px rgba(176,96,255,.4)}
.icon-btn:active{transform:scale(.92)}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.75);
  display:flex;align-items:center;justify-content:center;z-index:200;backdrop-filter:blur(4px)}
.modal-overlay.hidden{display:none}
.modal-box{background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:24px 28px;width:min(90vw,400px);box-shadow:0 0 40px rgba(176,96,255,.25)}
.modal-title{font-family:var(--fh);font-size:22px;font-weight:800;color:var(--energy);
  text-align:center;margin-bottom:20px;letter-spacing:.1em}
.modal-label{font-family:var(--fh);font-size:11px;color:var(--muted);letter-spacing:.1em;display:block;margin-bottom:6px}
.modal-input{width:100%;background:#0a0614;border:1px solid var(--border);border-radius:6px;
  color:var(--text);font-family:var(--fh);font-size:16px;padding:10px 12px;
  outline:none;box-sizing:border-box;letter-spacing:.08em}
.modal-input:focus{border-color:var(--energy);box-shadow:0 0 8px rgba(176,96,255,.3)}
.modal-field{margin-bottom:20px}
.modal-actions{display:flex;gap:10px;justify-content:center}

/* ===== RANKING MODAL ===== */
.rank-tabs{display:flex;gap:6px;margin-bottom:14px;justify-content:center}
.rank-tab{font-family:var(--fh);font-size:11px;font-weight:700;padding:5px 12px;
  border-radius:6px;border:1px solid var(--border);background:transparent;
  color:var(--muted);cursor:pointer;letter-spacing:.08em;transition:all .15s}
.rank-tab.active{border-color:var(--energy);color:var(--energy);background:rgba(176,96,255,.12)}
.rank-tab:hover{color:var(--text)}
.rank-empty{text-align:center;color:var(--muted);font-family:var(--fh);padding:24px;font-size:13px}
.ranking-item{display:flex;align-items:center;gap:10px;padding:8px 4px;
  border-bottom:1px solid rgba(255,255,255,.06)}
.ranking-item:last-child{border-bottom:none}
.ranking-item.current{background:rgba(176,96,255,.08);border-radius:6px}
.rank-pos{width:28px;font-size:16px;text-align:center;flex-shrink:0}
.rank-name{flex:1;font-family:var(--fh);font-size:13px;color:var(--text);letter-spacing:.06em}
.rank-score{font-family:var(--fh);font-size:15px;font-weight:700;color:var(--energy);min-width:70px;text-align:right}
.rank-date{font-family:var(--fh);font-size:10px;color:var(--muted);min-width:60px;text-align:right}

/* 名前未入力時のシェイクアニメーション */
@keyframes inputShake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* ===== HOW TO PLAY MODAL ===== */
.howto-box{max-height:85vh;overflow-y:auto;width:min(92vw,420px)}
.howto-title{color:var(--cyan)!important;text-shadow:0 0 16px var(--cyan)}
.howto-section-label{font-family:var(--fh);font-size:10px;font-weight:700;
  color:var(--muted);letter-spacing:.15em;margin:14px 0 8px;
  display:flex;align-items:center;gap:6px}
.howto-section-label::before{content:'';flex:none;width:16px;height:1px;background:var(--muted)}
.howto-keys{display:flex;flex-direction:column;gap:6px;margin-bottom:4px}
.howto-row{display:flex;align-items:center;gap:12px}
kbd{font-family:var(--fh);font-size:11px;background:#0a0614;border:1px solid var(--border);
  border-radius:5px;padding:4px 8px;min-width:52px;text-align:center;
  color:var(--text);letter-spacing:.05em;flex-shrink:0}
.howto-row span{font-family:var(--fh);font-size:13px;color:var(--text-m)}
.howto-mechs{display:flex;flex-direction:column;gap:7px}
.howto-mech-row{display:flex;align-items:center;gap:10px;font-family:var(--fh);font-size:13px;color:var(--text-m)}
.howto-icon{font-size:16px;width:24px;text-align:center;flex-shrink:0}

/* 難易度バッジ（ゲームオーバー画面） */
.diff-badge{font-family:var(--fh);font-size:12px;font-weight:700;letter-spacing:.2em;
  padding:3px 14px;border-radius:4px;border:1px solid;margin-top:-6px}
.diff-badge[data-diff="easy"]   {color:#00ff88;border-color:#00ff88;text-shadow:0 0 8px #00ff88}
.diff-badge[data-diff="normal"] {color:var(--cyan);border-color:var(--cyan);text-shadow:0 0 8px var(--cyan)}
.diff-badge[data-diff="hard"]   {color:var(--gold);border-color:var(--gold);text-shadow:0 0 8px var(--gold)}
.diff-badge[data-diff="extreme"]{color:var(--rift);border-color:var(--rift);text-shadow:0 0 8px var(--rift)}

/* 難易度表示（ゲーム画面左パネル） */
.diff-display{font-family:var(--fh);font-size:14px;font-weight:800;letter-spacing:.12em;
  padding:2px 0;text-shadow:0 0 8px currentColor}
.diff-display[data-diff="easy"]   {color:#00ff88}
.diff-display[data-diff="normal"] {color:var(--cyan)}
.diff-display[data-diff="hard"]   {color:var(--gold)}
.diff-display[data-diff="extreme"]{color:var(--rift)}