:root{--bg: #f4f6fb;--surface: #ffffff;--border: #e2e6ef;--text: #1c2430;--muted: #6b7686;--primary: #2f6df6;--primary-dark: #1f57d6;--green: #18a558;--amber: #e6a100;--red: #e23d3d;--radius: 10px;--shadow: 0 1px 3px rgba(20, 30, 50, .08), 0 1px 2px rgba(20, 30, 50, .04);font-synthesis:none}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.5}.app{min-height:100%;display:flex;flex-direction:column}.app__main{flex:1;padding:20px;max-width:1280px;width:100%;margin:0 auto}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1{font-size:1.4rem;margin:0 0 16px}h2{font-size:1.1rem;margin:0 0 12px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:8px 14px;border-radius:var(--radius);cursor:pointer;font-size:.95rem;font-weight:500;transition:background .15s,border-color .15s}.btn:hover{background:#f0f3fa}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn--primary:hover{background:var(--primary-dark)}.btn--danger{background:var(--red);border-color:var(--red);color:#fff}.btn--ghost{background:transparent;border-color:transparent}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-size:.85rem;color:var(--muted);font-weight:600}.input,select.input,textarea.input{border:1px solid var(--border);border-radius:8px;padding:9px 11px;font-size:.95rem;background:#fff;color:var(--text);width:100%}.input:focus{outline:2px solid rgba(47,109,246,.3);border-color:var(--primary)}.error-text{color:var(--red);font-size:.9rem}.muted{color:var(--muted)}.auth{max-width:380px;margin:8vh auto}.auth__brand{text-align:center;margin-bottom:18px}.auth__brand b{color:var(--primary)}.save-status{display:inline-flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600}.save-status:before{content:"";width:9px;height:9px;border-radius:50%;background:var(--muted)}.save-status--synced{color:var(--green)}.save-status--synced:before{background:var(--green)}.save-status--saving{color:var(--amber)}.save-status--saving:before{background:var(--amber)}.save-status--unsynced,.save-status--error,.save-status--conflict{color:var(--red)}.save-status--unsynced:before,.save-status--error:before,.save-status--conflict:before{background:var(--red)}.journal-table-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}table.journal{border-collapse:collapse;width:100%;font-size:.9rem}table.journal th,table.journal td{border:1px solid var(--border);padding:4px 6px;text-align:center;white-space:nowrap}table.journal thead th{background:#f7f9fd;position:sticky;top:0;font-weight:600;color:var(--muted)}table.journal th.col-student,table.journal td.col-student{text-align:left;position:sticky;left:0;background:var(--surface);min-width:180px;z-index:1}table.journal thead th.col-student{z-index:2}table.journal td.col-readonly{background:#f6f7fa;color:var(--muted)}table.journal tr.row--absent td{opacity:.55}.grade-input{width:42px;border:1px solid transparent;border-radius:6px;padding:5px 2px;text-align:center;font-size:.92rem}.grade-input:hover{border-color:var(--border)}.grade-input:focus{outline:none;border-color:var(--primary);background:#eef3ff}.header{background:var(--surface);border-bottom:1px solid var(--border)}.header__inner{max-width:1280px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:14px}.header__brand{font-weight:700}.header__brand span{color:var(--primary)}.header__spacer{flex:1}.groups-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.group-card{cursor:pointer;transition:transform .1s,box-shadow .1s}.group-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #141e321f}.group-card__metrics{display:flex;gap:16px;margin-top:10px;color:var(--muted);font-size:.85rem}.group-card__metrics b{color:var(--text);font-size:1rem;display:block}.badge-warn{color:var(--red)}.lesson-bar{display:flex;flex-wrap:wrap;gap:14px;align-items:flex-end}.lesson-bar .field{margin-bottom:0;min-width:130px}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:14px 0}.dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f162373;display:flex;align-items:center;justify-content:center;z-index:50}.dialog{background:var(--surface);border-radius:var(--radius);padding:20px;width:min(440px,92vw);box-shadow:0 20px 50px #00000040}.dialog__actions{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}@media (max-width: 640px){.app__main{padding:12px}.lesson-bar{gap:8px}}