*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:#f6f8fc;color:#12213a}header{display:flex;justify-content:space-between;gap:16px;padding:18px 5vw;background:#fff;border-bottom:1px solid #dfe6f1}header a{color:#123f8f;text-decoration:none;font-weight:800}nav{display:flex;gap:14px}main{width:min(1180px,92vw);margin:26px auto}.hero,.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.card,dialog section{background:#fff;border:1px solid #dfe6f1;border-radius:18px;padding:20px;margin:16px 0;box-shadow:0 8px 24px #14264a0d}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;align-items:end}label{display:grid;gap:6px;font-weight:700}input,select,button{font:inherit;border:1px solid #c8d3e4;border-radius:12px;padding:10px 12px}button{background:#174ea6;color:#fff;border:0;font-weight:800;cursor:pointer}.classes{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.class-card{border:1px solid #dfe6f1;border-radius:16px;padding:16px;background:#fbfcff}.class-card h3{margin:0 0 8px}.pill{display:inline-block;padding:5px 9px;border-radius:999px;background:#edf3ff;margin:3px;font-size:.9rem}.student-row{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px solid #edf0f5}.hint{color:#63708a}#message{min-height:24px;color:#8a4b00}dialog{width:min(900px,94vw);border:0;border-radius:20px;padding:20px}dialog::backdrop{background:#10203a88}fieldset{border:1px solid #dfe6f1;border-radius:12px;display:flex;flex-wrap:wrap;gap:10px}fieldset label{display:flex;align-items:center;gap:5px}@media(max-width:640px){header,.hero{align-items:flex-start;flex-direction:column}.grid{grid-template-columns:1fr}}
.student-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.student-actions .button{display:inline-flex;align-items:center;text-decoration:none;background:#edf3ff;color:#174ea6;border-radius:12px;padding:10px 12px;font-weight:800}
button.danger{background:#b42318;color:#fff}
.student-row{align-items:center;flex-wrap:wrap}
#owner-class-controls{border:1px solid #f3c4c0;background:#fffaf9}
#owner-class-controls[hidden]{display:none}
@media(max-width:640px){.student-actions{width:100%}.student-actions button,.student-actions .button{flex:1;justify-content:center}}


[hidden]{display:none!important}

#period-fields{grid-column:1/-1}#period-fields p{flex-basis:100%;margin:4px 0}#period-fields label:has(input[type="date"]),#period-fields label:has(input[type="time"]){display:grid;min-width:180px}