:root { --blue:#006EBE; --dark:#2b2b2b; --bg:#f0f4f6; --ok:#1a9e5c; --bad:#d94040; --gray:#9aa5a5; }
* { box-sizing:border-box; margin:0; padding:0; font-family:system-ui,-apple-system,"Segoe UI",sans-serif; }
body { background:var(--bg); color:var(--dark); min-height:100vh; }
header { background:var(--blue); color:#fff; padding:14px 24px; display:flex; gap:14px; align-items:center; flex-wrap:wrap; }
header h1 { font-size:19px; cursor:pointer; }
header .spacer { margin-left:auto; }
header button { background:rgba(255,255,255,.15); color:#fff; border:1px solid rgba(255,255,255,.5); border-radius:8px; padding:7px 14px; font-size:14px; cursor:pointer; }
header button:hover { background:#fff; color:var(--blue); }
#logcount { font-size:13px; opacity:.85; }
main { max-width:900px; margin:24px auto; padding:0 16px; }
.card { background:#fff; border-radius:14px; padding:24px; box-shadow:0 2px 10px rgba(0,0,0,.07); margin-bottom:16px; }
h2 { color:var(--blue); margin-bottom:8px; }
h3 { color:var(--blue); margin-bottom:6px; font-size:17px; }
p.small { color:#666; font-size:14px; line-height:1.5; margin:5px 0; }
.grid3 { display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:14px; }
button.go { background:var(--blue); color:#fff; border:none; border-radius:10px; padding:11px 22px; font-size:16px; cursor:pointer; margin-top:10px; }
button.go:hover { filter:brightness(1.1); }
select { padding:8px 10px; border-radius:8px; border:1.5px solid var(--gray); font-size:14px; background:#fff; }
.hidden { display:none !important; }
/* module screen */
.modhead { display:flex; align-items:baseline; gap:18px; flex-wrap:wrap; }
.modhead .time { font-size:26px; font-weight:700; color:var(--blue); font-variant-numeric:tabular-nums; }
.statusbar { display:flex; gap:20px; font-size:15px; margin:8px 0; color:#444; }
.statusbar b { color:var(--blue); }
.timerwrap { height:9px; background:#e3e9ee; border-radius:5px; overflow:hidden; margin:8px 0 16px; }
.timerbar { height:100%; background:var(--blue); width:100%; }
.itemtimerwrap { height:5px; background:#e3e9ee; border-radius:3px; overflow:hidden; margin:6px 0 12px; }
.itemtimerbar { height:100%; background:#e8a13c; width:100%; }
#arena { min-height:340px; }
.feedback { font-size:17px; font-weight:600; min-height:26px; margin-top:10px; }
.feedback.ok { color:var(--ok); } .feedback.bad { color:var(--bad); }
/* switch */
.symrow { display:flex; gap:12px; justify-content:center; font-size:36px; margin:6px 0; }
.symrow .slot { width:56px; height:56px; display:flex; align-items:center; justify-content:center; background:#f4f7f9; border-radius:10px; }
.codebetween { text-align:center; font-size:17px; color:#555; margin:2px 0; letter-spacing:3px; }
.codebetween b { color:var(--blue); font-size:19px; }
.codebetween .unknown { color:var(--bad); font-weight:700; font-size:20px; }
.opts { display:flex; gap:12px; justify-content:center; flex-wrap:wrap; margin-top:14px; }
.opts button { font-size:20px; letter-spacing:4px; padding:10px 18px; border:2px solid var(--blue); background:#fff; color:var(--blue); border-radius:10px; cursor:pointer; }
.opts button:hover { background:var(--blue); color:#fff; }
.opts button.sel { background:var(--blue); color:#fff; }
.steprow { margin-top:2px; }
.steprow button { font-size:17px; padding:7px 14px; letter-spacing:3px; }
.switchflow { position:relative; }
.switchflow > * { position:relative; }
.switchflow .flow-svg { position:absolute; inset:0; z-index:0; pointer-events:none; }
.flow-line { fill:none; stroke:#c9d6df; stroke-width:2; }
.flow-line.sel { stroke:var(--blue); stroke-width:3.5; }
/* digit */
.equation { display:flex; gap:16px; justify-content:center; align-items:center; font-size:36px; margin:14px 0; flex-wrap:wrap; }
.numgroup { display:flex; gap:3px; align-items:center; border-bottom:3px solid #d5dee5; padding-bottom:4px; }
.dslot { width:54px; height:54px; border:2.5px dashed #b6c4cf; border-radius:10px; display:flex; align-items:center; justify-content:center; background:#f8fafc; }
.dslot.cur { border-color:var(--blue); background:#eaf3fb; }
.dslot.filled { border-style:solid; border-color:var(--blue); color:var(--blue); font-weight:700; }
.dslot.shown { border:none; background:none; }
.digitpad { display:flex; gap:9px; justify-content:center; margin-top:12px; flex-wrap:wrap; }
.digitpad button { width:50px; height:50px; font-size:21px; border:2px solid var(--blue); border-radius:10px; background:#fff; color:var(--blue); cursor:pointer; }
.digitpad button:disabled { opacity:.25; cursor:default; }
.digitpad button.util { width:auto; padding:0 14px; font-size:14px; }
/* memory */
.canvas { position:relative; height:360px; background:#fff; border:1.5px solid #dde5ea; border-radius:12px; margin:8px 0; }
.dot { position:absolute; width:44px; height:44px; border-radius:50%; transform:translate(-50%,-50%); }
.dot.show { background:var(--blue); }
.dot.empty { background:#fff; border:2.5px solid #dde5ea; }
.dot.pick { background:#fff; border:2.5px solid var(--gray); cursor:pointer; }
.dot.pick:hover { border-color:var(--blue); }
.dot.picked { background:#bcd8ef; border-color:var(--blue); color:var(--blue); font-weight:700; display:flex; align-items:center; justify-content:center; }
.minigrids { display:flex; gap:30px; justify-content:center; align-items:center; flex-wrap:wrap; margin-top:10px; }
.mgrid { display:grid; gap:4px; }
.mcell { width:32px; height:32px; background:#e8eef3; border-radius:5px; }
.mcell.on { background:var(--dark); }
.yn { display:flex; gap:14px; justify-content:center; margin-top:16px; }
.yn button { font-size:16px; padding:11px 30px; border:2px solid var(--blue); border-radius:10px; background:#fff; color:var(--blue); cursor:pointer; }
.yn button:hover { background:var(--blue); color:#fff; }
.center { text-align:center; }
/* report */
table.report { border-collapse:collapse; margin:10px 0; width:100%; max-width:560px; }
table.report td, table.report th { padding:7px 12px; text-align:left; border-bottom:1px solid #e5ebef; font-size:15px; }
table.report th { color:var(--blue); }
.bigscore { font-size:42px; font-weight:800; color:var(--blue); }
/* pause overlay */
#pause { position:fixed; inset:0; background:rgba(20,40,60,.82); color:#fff; display:flex; flex-direction:column; gap:12px; align-items:center; justify-content:center; z-index:50; font-size:22px; cursor:pointer; }