body{margin:0;font-family:Arial,sans-serif;background:#f5f6f8;color:#222}
.container{max-width:1100px;margin:auto;padding:20px}
header{background:#fff;border-bottom:1px solid #ddd}
.header-row,.page-header,.homework-card{display:flex;justify-content:space-between;align-items:center;gap:20px}
nav a{margin-left:18px;text-decoration:none;color:#333}
.cards,.stat-cards,.recommend-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.stat-cards{grid-template-columns:repeat(3,1fr);margin-bottom:28px}
.card,.homework-card,.task,.stat-card,.recommend-card,.source-box{background:#fff;border-radius:10px;padding:20px;margin-bottom:18px;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.card{text-decoration:none;color:inherit}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.button,button{display:inline-block;padding:10px 18px;background:#2563eb;color:#fff;border:0;border-radius:6px;cursor:pointer;text-decoration:none}
.button.secondary{background:#475569}.button.small{padding:7px 11px;font-size:14px}
.muted{color:#64748b}.task-title{font-size:19px;font-weight:700;margin-bottom:12px}
.task-text{margin:18px 0}.task-text img{max-width:100%;height:auto}
input,select,textarea{box-sizing:border-box;width:100%;padding:10px;font-size:16px;border:1px solid #cbd5e1;border-radius:6px;margin:6px 0 14px}
textarea{resize:vertical}.form-row,.filter-form{margin-bottom:18px}
.filter-form{display:grid;grid-template-columns:180px 1fr auto;gap:10px;align-items:center}
.task-selector{display:grid;gap:10px;margin-bottom:20px}.task-option{display:flex;gap:12px;background:#fff;padding:14px;border-radius:8px}
.task-option input{width:auto;margin:4px 0}.preview{margin-top:7px;color:#475569}
.badge,.score{display:inline-block;background:#e2e8f0;border-radius:999px;padding:4px 8px;font-size:12px;margin-left:8px}
.score{background:#dbeafe;color:#1d4ed8}.correct,.incorrect{margin:14px 0;padding:10px;border-radius:7px}
.correct{background:#dcfce7;color:#166534}.incorrect{background:#fee2e2;color:#991b1b}
.solution-box{background:#f8fafc;padding:12px;border-radius:7px}.solution-text{white-space:pre-wrap;margin-top:8px}
.results-table{width:100%;border-collapse:collapse;background:#fff;margin-bottom:28px}
.results-table th,.results-table td{padding:12px;border-bottom:1px solid #e2e8f0;text-align:left}
.stat-value{font-size:34px;font-weight:700}.empty-state{background:#fff;padding:30px;border-radius:10px}
@media(max-width:700px){.cards,.stat-cards,.recommend-grid{grid-template-columns:1fr}.page-header,.homework-card{align-items:flex-start;flex-direction:column}.filter-form{grid-template-columns:1fr}}

.teacher-note{background:#eff6ff;border:1px solid #bfdbfe;padding:12px 14px;border-radius:8px;margin-bottom:18px}
.student-task-status{margin:12px 0;padding:9px 11px;border-radius:7px;font-size:14px;font-weight:600}
.student-task-status.not-solved{background:#f1f5f9;color:#475569}
.student-task-status.solved-correct{background:#dcfce7;color:#166534}
.student-task-status.solved-wrong{background:#fee2e2;color:#991b1b}

.login-wrap{max-width:460px;margin:50px auto}
.login-card{background:#fff;border-radius:12px;padding:28px;box-shadow:0 2px 12px rgba(0,0,0,.08)}
.logout-form{display:inline;margin-left:14px}
.nav-button{background:none;color:#333;padding:0;font:inherit;border:0;cursor:pointer}

.homework-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.homework-actions form{margin:0}
.button.danger{background:#b91c1c}
.button.danger:hover{background:#991b1b}
.homework-score{margin:6px 0 0;font-size:16px}

.task-option-body{min-width:0;flex:1}.attempt-status{display:block;width:max-content;max-width:100%;margin-top:8px;padding:5px 9px;border-radius:6px;font-size:13px}
.attempt-success{background:#dcfce7;color:#166534}.attempt-fail{background:#fee2e2;color:#991b1b}.attempt-new{background:#f1f5f9;color:#475569}
.pagination{display:flex;gap:7px;justify-content:center;align-items:center;flex-wrap:wrap;margin:24px 0}.pagination a{padding:8px 11px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;text-decoration:none;color:#334155}.pagination a.active{background:#2563eb;color:#fff;border-color:#2563eb}

.unsolved-filter{
    display:flex;
    align-items:center;
    gap:8px;
    white-space:nowrap;
    padding:0 4px;
}
.unsolved-filter input{
    width:auto;
    margin:0;
}

.selection-summary{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:10px 0 14px}
.button.small{padding:5px 9px;font-size:13px}

.current-homework-box{margin:16px 0 22px;padding:14px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc}
.current-homework-item{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px;padding:8px 10px;background:#fff;border-radius:6px}

.deadline-countdown{font-weight:600;margin:.45rem 0}
.deadline-expired{font-weight:700}
.late-badge{font-weight:700}

.telegram-panel{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 18px;padding:14px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc}
.telegram-panel p{margin:.35rem 0 0}
button:disabled{opacity:.55;cursor:not-allowed}

.teacher-comment-form{margin-top:16px;padding-top:14px;border-top:1px solid #e2e8f0}
.teacher-comment-form textarea{width:100%;box-sizing:border-box;margin:.45rem 0 .6rem}
.teacher-comment-box{margin:14px 0;padding:12px 14px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc}
.teacher-comment-text{margin-top:6px;white-space:pre-wrap}

.task-full-preview{margin-top:10px;overflow-x:auto}
.task-full-preview img{max-width:100%;height:auto}
.task-full-preview table{max-width:100%}
.task-option-body{min-width:0}

.teacher-result-task-text{margin:12px 0 16px;overflow-x:auto}
.teacher-result-task-text img{max-width:100%;height:auto}
.teacher-result-task-text table{max-width:100%}