:root{--bg:#0f1115;--panel:#171a21;--line:#262b36;--ink:#e8eaf0;--dim:#98a0b3;
--accent:#4f7cff;--ok:#2fbf71;--warn:#e8b93c;--err:#e5484d;--radius:10px}
@media(prefers-color-scheme:light){:root{--bg:#f6f7fa;--panel:#fff;--line:#e2e5ec;
--ink:#12151c;--dim:#5b6478}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
.wrap{max-width:960px;margin:0 auto;padding:24px}
.center{max-width:420px;margin:8vh auto;padding:24px}
h1{font-size:1.6rem;margin:0 0 4px}h2{font-size:1.15rem;margin:28px 0 10px}
.sub{color:var(--dim);margin:0 0 24px}
.card{background:var(--panel);border:1px solid var(--line);
border-radius:var(--radius);padding:20px;margin-bottom:16px}
label{display:block;font-size:.85rem;color:var(--dim);margin:14px 0 5px}
input,select{width:100%;padding:11px 12px;background:var(--bg);color:var(--ink);
border:1px solid var(--line);border-radius:8px;font-size:1rem}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px}
button{width:100%;padding:11px 14px;border:0;border-radius:8px;background:var(--accent);
color:#fff;font-size:1rem;font-weight:600;cursor:pointer;margin-top:16px}
button:hover{filter:brightness(1.08)}button:disabled{opacity:.55;cursor:not-allowed}
button.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.row{display:flex;gap:10px;align-items:center;justify-content:space-between}
.msg{padding:11px 13px;border-radius:8px;margin-top:14px;font-size:.9rem;display:none}
.msg.show{display:block}
.msg.err{background:rgba(229,72,77,.13);color:var(--err);border:1px solid rgba(229,72,77,.3)}
.msg.ok{background:rgba(47,191,113,.13);color:var(--ok);border:1px solid rgba(47,191,113,.3)}
.msg.warn{background:rgba(232,185,60,.13);color:var(--warn);border:1px solid rgba(232,185,60,.3)}
.link{color:var(--accent);cursor:pointer;text-decoration:none;font-size:.9rem}
.muted{color:var(--dim);font-size:.85rem}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line)}
th{color:var(--dim);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em}
.pill{display:inline-block;padding:2px 9px;border-radius:99px;font-size:.75rem;
font-weight:600;background:var(--line);color:var(--ink)}
.pill.admin{background:rgba(79,124,255,.2);color:var(--accent)}
.pill.tutor{background:rgba(47,191,113,.2);color:var(--ok)}
.pill.parent{background:rgba(232,185,60,.2);color:var(--warn)}
/* Work waiting on a human. Used by the tutor's Quick-Check table. */
.pill.warn{background:rgba(232,185,60,.2);color:var(--warn);margin-left:6px}
.topbar{display:flex;justify-content:space-between;align-items:center;
padding:14px 24px;border-bottom:1px solid var(--line);background:var(--panel)}
.topbar button{width:auto;margin:0;padding:7px 14px;font-size:.85rem}
hr{border:0;border-top:1px solid var(--line);margin:22px 0}