:root{
  color-scheme:dark;
  --bg:#080d15;--panel:#111a27;--panel2:#172437;--line:#2b3c52;
  --ink:#eef6ff;--muted:#8091a7;--accent:#73e4c1;--accent2:#70bfff;
  --bad:#ff7188;--warn:#ffd37b;
  font-family:Inter,"Noto Sans JP",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;overflow:hidden;background:var(--bg);color:var(--ink)}
button,select{font:inherit;color:inherit}
button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
#app{height:100dvh;display:grid;grid-template-rows:calc(48px + env(safe-area-inset-top)) minmax(0,1fr)}
.app-header{
  padding:calc(5px + env(safe-area-inset-top)) 7px 5px;
  display:grid;grid-template-columns:minmax(94px,1fr) auto auto;align-items:center;gap:5px;
  border-bottom:1px solid var(--line);background:rgba(8,13,21,.96)
}
.brand{min-width:0;line-height:1}.brand small{display:block;color:var(--muted);font-size:6px;letter-spacing:.16em}.brand strong{display:block;margin-top:3px;font-size:13px;white-space:nowrap}
.app-header label{display:grid;grid-template-columns:auto auto;align-items:center;gap:3px;color:var(--muted);font-size:7px}
.app-header select,.card-toolbar select{
  height:30px;border:1px solid var(--line);border-radius:9px;background:var(--panel);padding:0 7px;font-size:9px;font-weight:850
}
#board{width:min(100%,680px);height:100%;min-height:0;margin:0 auto;padding:8px;display:grid;grid-template-rows:minmax(0,44%) minmax(0,44%);align-content:center;gap:10px;overflow:hidden}
.deck{position:relative;min-width:0;min-height:0;padding:15px 4px 4px;display:grid;gap:5px;border:1px solid rgba(86,105,132,.22);border-radius:16px;background:rgba(5,10,17,.22);overflow:hidden}
.deck-label{position:absolute;top:3px;left:8px;color:var(--muted);font-size:6px;font-weight:900;letter-spacing:.16em}
.layout-single .deck{grid-template:1fr/1fr}
.layout-double .deck{grid-template:repeat(2,minmax(0,1fr))/1fr}
.layout-triple .deck{grid-template:repeat(3,minmax(0,1fr))/1fr}
.layout-quad .deck{grid-template:repeat(4,minmax(0,1fr))/1fr;gap:3px}
.layout-grid4 .deck{grid-template:repeat(2,minmax(0,1fr))/repeat(2,minmax(0,1fr))}
.slot-card{
  --slot-accent:var(--accent);
  position:relative;min-width:0;min-height:0;overflow:hidden;
  border:1px solid color-mix(in srgb,var(--slot-accent) 34%,var(--line));
  border-radius:14px;background:linear-gradient(150deg,color-mix(in srgb,var(--slot-accent) 8%,var(--panel2)),var(--panel));
  box-shadow:0 7px 18px rgba(0,0,0,.2)
}
.question-card{display:grid;grid-template-rows:31px minmax(0,1fr);gap:3px;padding:5px}
.answer-card{padding:5px}
.slot-card[data-slot="b"]{--slot-accent:var(--accent2)}
.slot-card[data-slot="c"]{--slot-accent:var(--warn)}
.slot-card[data-slot="d"]{--slot-accent:#ef8bff}
.card-toolbar{min-width:0;display:grid;grid-template-columns:minmax(0,1fr) 59px auto;gap:4px}
.card-toolbar select{width:100%;height:31px}
.difficulty-button,.sound-button{
  min-width:0;height:31px;border:1px solid var(--line);border-radius:9px;background:rgba(5,10,17,.46);font-size:8px;font-weight:900
}
.difficulty-button.easy{color:var(--accent)}.difficulty-button.hard{color:var(--warn)}
.sound-button{width:38px;color:var(--slot-accent)}
.question{min-height:0;display:grid;place-items:center;text-align:center;padding:2px 6px;overflow:hidden}
.question b{display:block;max-width:100%;font-size:clamp(14px,4.4vw,25px);line-height:1.08;overflow:hidden;text-overflow:ellipsis}
.question small{display:block;margin-top:4px;color:var(--muted);font-size:7px;letter-spacing:.05em}
.answers{height:100%;min-height:0;display:grid;grid-template-columns:1fr 1fr;gap:5px}
.answers button{
  min-width:0;min-height:0;border:1px solid color-mix(in srgb,var(--slot-accent) 30%,var(--line));border-radius:11px;
  background:linear-gradient(160deg,var(--panel2),#0d1622);box-shadow:0 3px 0 #05080d;
  padding:5px;font-size:clamp(10px,3.1vw,17px);font-weight:900;overflow:hidden;text-overflow:ellipsis
}
.answers button:active{transform:translateY(2px);box-shadow:0 1px 0 #05080d}
.slot-stats{position:absolute;right:8px;top:41px;color:var(--muted);font-size:7px;pointer-events:none}
.slot-stats b{color:var(--slot-accent)}
.feedback{
  position:absolute;inset:5px;display:grid;place-items:center;border-radius:10px;
  background:rgba(6,10,16,.78);font-size:42px;font-weight:300;opacity:0;pointer-events:none;transform:scale(.92)
}
.feedback.on{opacity:1;transform:scale(1)}.feedback.good{color:var(--accent)}.feedback.bad{color:var(--bad)}
.toast{position:fixed;left:50%;bottom:12px;transform:translate(-50%,12px);opacity:0;padding:8px 12px;border-radius:10px;background:#eaf4ff;color:#07101a;font-size:10px;font-weight:850;pointer-events:none}
.toast.on{opacity:1;transform:translate(-50%,0)}
html[data-theme="violet"]{--bg:#0d0915;--panel:#171225;--panel2:#251a38;--line:#49345f;--accent:#b49aff;--accent2:#68d8ef;--warn:#f5b9ff}
html[data-theme="amber"]{--bg:#120d08;--panel:#21170f;--panel2:#352316;--line:#59402a;--accent:#ffbd68;--accent2:#85ddc2;--warn:#ffe09a}
.layout-quad .slot-card{border-radius:9px}
.layout-quad .question-card{grid-template-rows:25px minmax(0,1fr);padding:3px;gap:1px}
.layout-quad .answer-card{padding:3px}
.layout-quad .card-toolbar{grid-template-columns:minmax(0,1fr) 52px auto;gap:3px}
.layout-quad .card-toolbar select,.layout-quad .difficulty-button,.layout-quad .sound-button{height:25px;font-size:7px}
.layout-quad .sound-button{width:29px}.layout-quad .question b{font-size:11px}.layout-quad .question small{display:none}.layout-quad .answers button{font-size:10px;padding:2px}.layout-quad .slot-stats{display:none}
.layout-grid4 .slot-card{border-radius:11px}
.layout-grid4 .question-card{grid-template-rows:29px minmax(0,1fr);padding:4px;gap:2px}
.layout-grid4 .answer-card{padding:4px}
.layout-grid4 .card-toolbar{grid-template-columns:minmax(0,1fr) 42px 27px}.layout-grid4 .sound-button{display:block;width:27px}
.layout-grid4 .card-toolbar select,.layout-grid4 .difficulty-button,.layout-grid4 .sound-button{height:29px;padding-inline:3px;font-size:7px}
.layout-grid4 .answers{grid-template-columns:1fr;gap:3px}.layout-grid4 .answers button{font-size:9px;padding:2px}.layout-grid4 .question b{font-size:12px}.layout-grid4 .slot-stats{display:none}
@media(max-width:350px){
  .brand small{display:none}.brand strong{font-size:11px}.app-header{grid-template-columns:minmax(70px,1fr) auto auto}.app-header label span{display:none}.app-header select{max-width:94px;padding-inline:5px}
}
@media(max-height:650px){
  #app{grid-template-rows:42px minmax(0,1fr)}.app-header{padding-top:3px;padding-bottom:3px}.brand small{display:none}
  #board{padding:5px;gap:7px}.deck{padding:13px 3px 3px;gap:3px;border-radius:12px}.deck-label{top:2px}
  .slot-card{border-radius:10px}.question-card{padding:3px;grid-template-rows:26px minmax(0,1fr)}.answer-card{padding:3px}
  .card-toolbar select,.difficulty-button,.sound-button{height:26px}.slot-stats{top:31px}.question b{font-size:12px}
}