/* CodeBattles — shared styles. Kid-friendly, matches the CodeShaala visual language. */
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:#f5f6fb;color:#0b1020;line-height:1.55;-webkit-text-size-adjust:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,'Liberation Mono',monospace}

/* header */
header.top{background:linear-gradient(100deg,#0b1020,#241247 60%,#161a36);color:#fff;position:sticky;top:0;z-index:40;box-shadow:0 2px 18px rgba(11,16,32,.28)}
.top .wrap{display:flex;align-items:center;gap:14px;height:58px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.brand .logo{width:32px;height:32px;border-radius:9px;background:conic-gradient(from 210deg,#f43f5e,#f59e0b,#7c3aed,#06b6d4,#f43f5e);display:grid;place-items:center;font-size:17px}
.brand b{color:#c7b3ff}
.top .spacer{flex:1}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:#c7d2fe;font-size:13.5px;font-weight:700;padding:7px 11px;border-radius:9px}
.nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.nav a.on{background:rgba(124,58,237,.35);color:#fff}
.chip-user{display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:5px 12px;font-size:13px;font-weight:700;color:#fff;cursor:pointer}
.chip-user .pts{color:#fbbf24}
.chip-user.login{background:linear-gradient(90deg,#7c3aed,#06b6d4);border:0}

/* generic */
.crumb{display:flex;gap:6px;align-items:center;color:#64748b;font-size:13px;padding:14px 0 2px;flex-wrap:wrap}
.crumb a{color:#6366f1;font-weight:700}.crumb .sep{opacity:.5}
.badge{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:800;padding:3px 9px;border-radius:999px;text-transform:uppercase;letter-spacing:.03em}
.badge.easy{background:#dcfce7;color:#15803d}
.badge.medium{background:#ffedd5;color:#c2410c}
.badge.pts{background:#eef2ff;color:#4338ca}
.badge.lv{background:#f3e8ff;color:#7c22ce}
.tick{color:#059669;font-weight:800}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 18px;font-size:15px;font-weight:800;cursor:pointer;font-family:inherit;transition:.14s transform,.14s box-shadow;color:#fff;background:linear-gradient(90deg,#7c3aed,#6d28d9)}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(124,58,237,.28)}
.btn:disabled{opacity:.55;cursor:default;transform:none;box-shadow:none}
.btn.run{background:linear-gradient(90deg,#0891b2,#0e7490)}
.btn.ghost{background:#fff;color:#4338ca;border:1.5px solid #ddd6fe}
.btn.sm{padding:8px 13px;font-size:13.5px;border-radius:10px}
.btn.big{padding:14px 26px;font-size:16.5px}

/* hero + contest card (home) */
.hero{padding:22px 0 8px}
.hero h1{font-size:34px;margin:0 0 4px;letter-spacing:-.6px}
.hero .tag{color:#475569;font-size:16px;max-width:640px;margin:.2em 0 0}
.cta-card{margin:18px 0 8px;border-radius:22px;padding:22px 24px;color:#fff;background:radial-gradient(1200px 200px at 10% -20%,rgba(6,182,212,.5),transparent),linear-gradient(120deg,#4c1d95,#6d28d9 45%,#7c3aed);box-shadow:0 18px 44px rgba(76,29,149,.34);position:relative;overflow:hidden;display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.cta-card .lbl{font-size:12.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#e9d5ff}
.cta-card h2{font-size:24px;margin:2px 0 6px}
.cta-card .meta{font-size:14px;color:#e9d5ff;font-weight:600}
.count{display:flex;gap:10px;align-items:center}
.count .box{background:rgba(0,0,0,.28);border:1px solid rgba(255,255,255,.16);border-radius:12px;padding:8px 12px;text-align:center;min-width:60px}
.count .box .n{font-size:26px;font-weight:900;line-height:1;font-variant-numeric:tabular-nums}
.count .box .u{font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:#cbb6ff}
.live-dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:#34d399;box-shadow:0 0 0 4px rgba(52,211,153,.3);animation:pulse 1.4s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(52,211,153,.35)}50%{box-shadow:0 0 0 8px rgba(52,211,153,0)}}

/* section */
.sec{margin:26px 0 6px}
.sec-h{display:flex;align-items:baseline;gap:10px;margin:0 0 12px;flex-wrap:wrap}
.sec-h h2{font-size:15px;margin:0;text-transform:uppercase;letter-spacing:.08em;color:#475569}
.sec-h .sub{color:#94a3b8;font-size:13px}
.sec-h .spacer{flex:1}

/* filters */
.filters{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 14px}
.filters .f{border:1.5px solid #e2e8f0;background:#fff;color:#475569;border-radius:999px;padding:6px 13px;font-size:13px;font-weight:700;cursor:pointer}
.filters .f.on{background:#0b1020;color:#fff;border-color:#0b1020}

/* problem grid */
.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:13px}
.pcard{background:#fff;border:1px solid #e6e8ef;border-radius:16px;padding:15px 16px;display:flex;flex-direction:column;gap:9px;box-shadow:0 1px 3px rgba(11,16,32,.05);cursor:pointer;transition:.15s transform,.15s box-shadow,.15s border-color}
.pcard:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(124,58,237,.15);border-color:#d6ccfb}
.pcard .row{display:flex;align-items:center;gap:8px}
.pcard .ttl{font-weight:800;font-size:16px;flex:1}
.pcard .tags{display:flex;gap:6px;flex-wrap:wrap}
.pcard .tags .t{font-size:11px;color:#64748b;background:#f1f5f9;border-radius:6px;padding:2px 7px;font-weight:600}
.pcard .foot{display:flex;align-items:center;gap:8px;margin-top:2px}
.pcard.solved{border-color:#bbf7d0;background:linear-gradient(#fff,#f6fef9)}

/* leaderboard */
.lb{background:#fff;border:1px solid #e6e8ef;border-radius:16px;overflow:hidden;box-shadow:0 1px 3px rgba(11,16,32,.05)}
.lb table{width:100%;border-collapse:collapse}
.lb th,.lb td{text-align:left;padding:11px 15px;font-size:14px;border-bottom:1px solid #eef1f6}
.lb th{font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;color:#94a3b8;background:#fafbff}
.lb td.rank{font-weight:900;color:#7c3aed;width:56px}
.lb td.pts{font-weight:800;text-align:right;color:#0b1020;font-variant-numeric:tabular-nums}
.lb tr.you{background:#fef9c3}
.lb tr:last-child td{border-bottom:0}
.medal{font-size:16px}

/* toolbar for scope toggles */
.toggle{display:inline-flex;background:#eef2ff;border-radius:999px;padding:4px;gap:2px}
.toggle button{border:0;background:transparent;color:#4338ca;font-weight:800;font-size:13.5px;padding:7px 16px;border-radius:999px;cursor:pointer}
.toggle button.on{background:#fff;color:#0b1020;box-shadow:0 1px 4px rgba(11,16,32,.12)}

/* SOLVER (play) */
.solve{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:18px;margin:14px 0 40px;align-items:start}
@media(max-width:900px){.solve{grid-template-columns:1fr}}
.panel{background:#fff;border:1px solid #e6e8ef;border-radius:16px;box-shadow:0 1px 3px rgba(11,16,32,.06)}
.prob{padding:20px 22px}
.prob h1{font-size:23px;margin:2px 0 8px;letter-spacing:-.3px}
.prob .row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.prob .stmt{font-size:15.5px;color:#1e293b}
.prob .stmt code{background:#f1f5f9;border-radius:5px;padding:1px 6px;font-size:.92em}
.egs{margin:14px 0 4px}
.egs .eg{background:#0b1020;color:#e2e8f0;border-radius:10px;padding:10px 13px;margin:7px 0;font-size:13.5px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.egs .eg .arrow{color:#7c3aed;font-weight:800}
.egs .eg .r{color:#34d399;font-weight:700}
.hintbox{margin-top:12px}
.hintbox summary{cursor:pointer;font-weight:800;color:#7c3aed;font-size:14px}
.hintbox p{background:#f5f3ff;border:1px solid #e9d5ff;border-radius:10px;padding:10px 13px;font-size:14px;margin:8px 0 0}

/* editor */
.editor-wrap{padding:14px 16px 16px}
.ed-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.ed-head .fn{font-size:13px;color:#64748b;font-weight:700}
.ed-head .spacer{flex:1}
.editor{position:relative;border:1.5px solid #e2e8f0;border-radius:12px;overflow:hidden;background:#0b1020}
textarea.code{width:100%;min-height:280px;resize:vertical;border:0;outline:0;background:#0b1020;color:#e5e7eb;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;line-height:1.6;padding:14px 15px;tab-size:4;white-space:pre;overflow:auto}
.actions{display:flex;gap:9px;margin-top:12px;flex-wrap:wrap;align-items:center}
.actions .spacer{flex:1}
.out{margin-top:12px;background:#0b1020;border-radius:12px;color:#cbd5e1;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px;padding:12px 14px;white-space:pre-wrap;min-height:44px;max-height:220px;overflow:auto;border:1px solid #1e293b}
.out:empty::before{content:'▶ Run your code to see the output here.';color:#64748b}
.verdict{margin-top:12px;border-radius:12px;padding:13px 15px;font-weight:700;font-size:14.5px;display:none}
.verdict.show{display:block}
.verdict.pass{background:#dcfce7;border:1px solid #86efac;color:#14532d}
.verdict.fail{background:#fee2e2;border:1px solid #fca5a5;color:#7f1d1d}
.verdict .big{font-size:17px;font-weight:900;display:flex;align-items:center;gap:8px}
.verdict .cases{margin-top:6px;font-weight:600;font-size:13.5px}
.stars{font-size:18px;letter-spacing:2px}

/* modal */
.mask{position:fixed;inset:0;background:rgba(11,16,32,.55);display:none;place-items:center;z-index:60;padding:18px}
.mask.show{display:grid}
.modal{background:#fff;border-radius:18px;max-width:400px;width:100%;padding:22px;box-shadow:0 30px 80px rgba(11,16,32,.45)}
.modal h3{margin:0 0 4px;font-size:20px}
.modal p.s{color:#64748b;font-size:13.5px;margin:0 0 14px}
.modal .tabs{display:flex;gap:6px;margin-bottom:14px;background:#f1f5f9;border-radius:10px;padding:4px}
.modal .tabs button{flex:1;border:0;background:transparent;font-weight:800;font-size:13.5px;padding:8px;border-radius:8px;cursor:pointer;color:#475569}
.modal .tabs button.on{background:#fff;color:#0b1020;box-shadow:0 1px 3px rgba(0,0,0,.1)}
.modal label{display:block;font-size:12.5px;font-weight:700;color:#475569;margin:10px 0 4px}
.modal input{width:100%;border:1.5px solid #e2e8f0;border-radius:10px;padding:10px 12px;font-size:15px;font-family:inherit}
.modal input:focus{outline:0;border-color:#7c3aed}
.modal .err{color:#dc2626;font-size:13px;font-weight:600;min-height:18px;margin-top:8px}
.modal .x{float:right;cursor:pointer;color:#94a3b8;font-size:20px;line-height:1;border:0;background:0}

/* contest lobby */
.lobby{text-align:center;padding:28px 20px 10px}
.lobby .state{font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:#7c3aed}
.lobby h1{font-size:30px;margin:6px 0 4px}
.lobby .big-count{display:flex;gap:12px;justify-content:center;margin:16px 0}
.lobby .big-count .box{background:#0b1020;color:#fff;border-radius:14px;padding:12px 16px;min-width:74px}
.lobby .big-count .n{font-size:34px;font-weight:900;line-height:1;font-variant-numeric:tabular-nums}
.lobby .big-count .u{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#a5b4fc;margin-top:3px}
.slots{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:8px 0}
.slot{background:#fff;border:1px solid #e6e8ef;border-radius:16px;padding:16px;text-align:left;box-shadow:0 1px 3px rgba(11,16,32,.05);display:flex;flex-direction:column;gap:8px;min-height:120px}
.slot.locked{opacity:.75;background:#f8fafc}
.slot.open{cursor:pointer;transition:.15s transform,.15s box-shadow}
.slot.open:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(124,58,237,.16)}
.slot .qn{font-size:12px;font-weight:800;color:#7c3aed;text-transform:uppercase;letter-spacing:.05em}
.slot .qt{font-weight:800;font-size:16px;flex:1}
.slot.done{border-color:#bbf7d0;background:linear-gradient(#fff,#f6fef9)}
.rules{color:#64748b;font-size:13.5px;background:#fff;border:1px solid #e6e8ef;border-radius:14px;padding:14px 18px;margin:18px 0}
.rules b{color:#0b1020}
.foot{color:#94a3b8;font-size:12px;text-align:center;padding:34px 0}
.empty{color:#94a3b8;font-size:14px;padding:24px;text-align:center}