:root{
  --bg1:#6d28d9; --bg2:#2563eb; --card:#ffffff; --ink:#1e1b3a; --muted:#6b7280;
  --accent:#7c3aed; --good:#16a34a; --bad:#dc2626; --ring:#ede9fe;
  --shadow:0 10px 30px rgba(76,29,149,.18);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:linear-gradient(150deg,var(--bg1),var(--bg2));
  background-attachment:fixed;
  -webkit-tap-highlight-color:transparent;
}
#app{max-width:520px;margin:0 auto;padding:16px 14px calc(28px + env(safe-area-inset-bottom));min-height:100vh}
.loading{color:#fff;text-align:center;padding:40vh 0;opacity:.85}

.brand{color:#fff;text-align:center;padding:10px 0 4px}
.brand h1{margin:0;font-size:1.5rem;letter-spacing:.5px}
.brand .sub{opacity:.85;font-size:.85rem;margin-top:2px}

.card{background:var(--card);border-radius:20px;padding:18px;box-shadow:var(--shadow);margin:12px 0}
.card h2{margin:0 0 12px;font-size:1.15rem}
.muted{color:var(--muted)}
.center{text-align:center}
.stack>*+*{margin-top:10px}

label{display:block;font-size:.85rem;font-weight:600;margin:0 0 4px;color:#4b5563}
input,select{
  width:100%;padding:13px 14px;border:2px solid #e5e7eb;border-radius:14px;font-size:1rem;
  background:#fff;color:var(--ink);outline:none;transition:border-color .15s;
}
input:focus,select:focus{border-color:var(--accent)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;
  padding:14px 16px;border:0;border-radius:14px;font-size:1rem;font-weight:700;cursor:pointer;
  background:var(--accent);color:#fff;transition:transform .08s, filter .15s;
}
.btn:active{transform:scale(.97)}
.btn:disabled{opacity:.5}
.btn.ghost{background:var(--ring);color:var(--accent)}
.btn.big{font-size:1.1rem;padding:18px}
.btn.good{background:var(--good)} .btn.bad{background:var(--bad)}
.btn.sm{width:auto;padding:9px 14px;font-size:.9rem;border-radius:11px}

.pick{display:grid;gap:12px;margin-top:18px}
.pick .tile{background:#fff;border-radius:20px;padding:22px;text-align:center;box-shadow:var(--shadow);cursor:pointer;border:0}
.pick .tile .emoji{font-size:2.4rem}
.pick .tile .t{font-weight:800;font-size:1.15rem;margin-top:6px}
.pick .tile .d{color:var(--muted);font-size:.85rem;margin-top:2px}

.row{display:flex;align-items:center;gap:10px}
.row.between{justify-content:space-between}
.chip{font-size:.72rem;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--ring);color:var(--accent)}
.code{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:800;letter-spacing:1px;background:#f5f3ff;color:var(--accent);padding:4px 10px;border-radius:10px}

.student-row{display:flex;align-items:center;justify-content:space-between;padding:12px 4px;border-bottom:1px solid #f1f1f4}
.student-row:last-child{border-bottom:0}
.student-row .nm{font-weight:700}
.student-row .pts{font-weight:800;color:var(--accent);min-width:54px;text-align:right}
.student-row .xdel{background:none;border:0;color:#cbd5e1;font-size:1.05rem;cursor:pointer;padding:6px 8px;margin-left:4px;line-height:1}
.student-row .xdel:active{color:var(--bad)}
.student-row.tap{cursor:pointer;border-radius:12px;padding:12px}
.student-row.tap:active{background:#faf5ff}

/* award sheet */
.sheet-bg{position:fixed;inset:0;background:rgba(20,10,40,.45);display:flex;align-items:flex-end;justify-content:center;z-index:40}
.sheet{background:#fff;width:100%;max-width:520px;border-radius:22px 22px 0 0;padding:18px 18px calc(20px + env(safe-area-inset-bottom));animation:up .2s ease}
@keyframes up{from{transform:translateY(30px);opacity:.6}to{transform:none;opacity:1}}
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:10px 0}
.quick button{padding:16px 0;border:2px solid var(--ring);background:#faf5ff;color:var(--accent);border-radius:14px;font-weight:800;font-size:1.1rem;cursor:pointer}
.quick button:active{transform:scale(.95)}
.seg{display:flex;gap:8px;margin:8px 0}
.seg button{flex:1;padding:11px;border:2px solid #e5e7eb;background:#fff;border-radius:12px;font-weight:700;cursor:pointer;color:#4b5563}
.seg button.on{border-color:var(--accent);background:#f5f3ff;color:var(--accent)}

/* student hero */
.hero{background:linear-gradient(150deg,#7c3aed,#2563eb);color:#fff;border-radius:22px;padding:22px 18px;text-align:center;box-shadow:var(--shadow)}
.hero .lvl{font-size:.8rem;font-weight:700;opacity:.9;text-transform:uppercase;letter-spacing:1px}
.hero .big{font-size:3.4rem;font-weight:900;line-height:1;margin:6px 0}
.hero .big small{font-size:1rem;font-weight:700;opacity:.85}
.bar{height:14px;background:rgba(255,255,255,.25);border-radius:999px;overflow:hidden;margin:14px 0 6px}
.bar>span{display:block;height:100%;background:#fde047;border-radius:999px;width:0;transition:width .9s cubic-bezier(.2,.8,.2,1)}
.hero .next{font-size:.85rem;opacity:.95}
.hero .house{background:linear-gradient(180deg,rgba(255,255,255,.14),rgba(255,255,255,.04));border-radius:16px;padding:6px;margin:8px 0}
.hero .house svg g{transition:opacity .6s ease, transform .6s ease}
.thr{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:4px 0}
.thr label{display:flex;flex-direction:column;align-items:center;gap:5px;font-size:.82rem;font-weight:800;color:var(--accent)}
.thr input{text-align:center;padding:10px 4px;font-weight:700}
.gbook{display:flex;flex-wrap:wrap;gap:8px}
.gchip{display:inline-grid;place-items:center;min-width:42px;height:42px;border-radius:12px;background:linear-gradient(150deg,#7c3aed,#2563eb);color:#fff;font-weight:900;font-size:1.1rem;box-shadow:0 4px 10px rgba(76,29,149,.25)}
.badges{display:flex;flex-wrap:wrap;gap:12px}
.badge{display:flex;flex-direction:column;align-items:center;gap:4px;width:66px;text-align:center}
.badge .be{font-size:2rem;line-height:1}
.badge .bn{font-size:.68rem;font-weight:800;color:var(--ink);line-height:1.15}
.badge.locked{opacity:.3;filter:grayscale(1)}

.hist .ev{display:flex;justify-content:space-between;align-items:center;padding:11px 2px;border-bottom:1px solid #f1f1f4}
.hist .ev:last-child{border-bottom:0}
.hist .ev .r{font-weight:600}
.hist .ev .c{font-size:.72rem;color:var(--muted)}
.hist .ev .p{font-weight:800}
.hist .ev .p.plus{color:var(--good)} .hist .ev .p.minus{color:var(--bad)}

.err{background:#fef2f2;color:#b91c1c;padding:11px 13px;border-radius:12px;font-size:.9rem;font-weight:600}
.ok{background:#f0fdf4;color:#15803d;padding:11px 13px;border-radius:12px;font-size:.9rem;font-weight:600}
.back{background:none;border:0;color:#fff;font-weight:700;cursor:pointer;padding:8px 0;font-size:.95rem}
.toolbar{display:flex;justify-content:space-between;align-items:center;color:#fff}

/* level-up + confetti */
#confetti-root{position:fixed;inset:0;pointer-events:none;z-index:60;overflow:hidden}
.confetti{position:absolute;top:-12px;width:10px;height:14px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg);opacity:.9}}
.levelup{position:fixed;inset:0;display:grid;place-items:center;z-index:55;pointer-events:none}
.levelup .msg{background:#fff;border-radius:20px;padding:20px 26px;box-shadow:var(--shadow);text-align:center;animation:pop .35s ease}
.levelup .msg .e{font-size:3rem}.levelup .msg .t{font-weight:900;font-size:1.3rem;margin-top:4px;color:var(--accent)}
@keyframes pop{from{transform:scale(.6);opacity:0}to{transform:none;opacity:1}}
.spark{animation:sparkle .5s ease}
@keyframes sparkle{0%{transform:scale(1)}40%{transform:scale(1.18)}100%{transform:scale(1)}}