:root{--blue:#1e5aa8;--blue-deep:#123c72;--blue-tint:#eaf1fb;--ink:#1a1a2e;--ink-soft:#5b6b84;--line:#d8e0ec;--danger:#c0392b}*{box-sizing:border-box}body{color:#1a1a2e;background:#f0f3f8;margin:0;font-family:system-ui,sans-serif}.app{max-width:860px;margin:0 auto;padding:16px}header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}header h1{font-size:20px}nav button{margin-left:8px}.card{background:#fff;border-radius:12px;margin:16px 0;padding:20px;box-shadow:0 1px 4px #00000014}button{color:#fff;cursor:pointer;background:#1e5aa8;border:none;border-radius:8px;padding:10px 18px;font-size:15px}button:disabled{opacity:.5}nav button.active{background:#123c72}input{border:1px solid #ccc;border-radius:8px;padding:10px;font-size:15px}.login{text-align:center;flex-direction:column;gap:12px;max-width:320px;margin:15vh auto;display:flex}.error{color:#c0392b}.hint{color:#666;font-size:13px}.newrow,.sendrow{flex-wrap:wrap;align-items:center;gap:12px;margin:8px 0;display:flex}.studentlist{max-height:300px;padding:0;list-style:none;overflow:auto}.studentlist li{cursor:pointer;border-radius:6px;padding:8px 10px}.studentlist li:hover{background:#eef3fb}.studentlist li.active{color:#fff;background:#1e5aa8}.tablewrap{-webkit-overflow-scrolling:touch;overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:center;white-space:nowrap;border:1px solid #ddd;padding:6px 10px}th{background:#f5f7fa}.logo{vertical-align:-6px;border-radius:7px;width:30px;height:30px}.loginlogo{border-radius:14px;align-self:center;width:64px;height:64px}.avgrow td{background:var(--blue-tint)!important}.segmented{background:var(--blue-tint);border:1px solid #c7d9f2;border-radius:8px;gap:2px;margin-bottom:10px;padding:3px;display:inline-flex}.segmented button{color:var(--blue-deep);box-shadow:none;background:0 0;border-radius:6px;padding:7px 16px;font-size:14px}.segmented button:hover{background:#1e5aa81a}.segmented button.active{background:var(--blue);color:#fff}.linkbtn{color:var(--blue);box-shadow:none;background:0 0;padding:4px;font-size:14px;text-decoration:underline}.linkbtn:hover{color:var(--blue-deep);background:0 0}.linkbtn:disabled{color:var(--ink-soft);text-decoration:none}.trend{width:100%;max-width:560px;margin:4px 0 16px;display:block}