/* ============ physfun.ru — панель учителя ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #667eea;
    --primary-dark: #5a6fd6;
    --accent: #764ba2;
    --bg: #f5f7fa;
    --card: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --success: #059669;
    --warning-bg: #fef3c7; --warning-text: #92400e;
    --ok-bg: #d1fae5;     --ok-text: #065f46;
    --grade-bg: #dbeafe;  --grade-text: #1e40af;
    --radius: 16px;
    --shadow: 0 2px 12px rgba(0,0,0,0.06);
    --shadow-hover: 0 6px 24px rgba(0,0,0,0.12);
}

html, body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    color: var(--text);
    min-height: 100vh;
}

.hidden { display: none !important; }

/* ===================== ВХОД ===================== */
.login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: var(--card);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.10);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-logo { font-size: 48px; margin-bottom: 8px; }
.login-card h1 { font-size: 26px; margin-bottom: 4px; }
.login-sub { color: var(--text-muted); margin-bottom: 24px; }

.login-card label {
    display: block;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin: 14px 0 6px;
}

.login-card input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

.login-card input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.error-msg {
    margin-top: 16px;
    background: #fee2e2;
    color: #b91c1c;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 14px;
}

/* ===================== КНОПКИ ===================== */
.btn {
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 10px;
    padding: 9px 18px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    color: var(--text);
    cursor: pointer;
    transition: all .15s;
}

.btn:hover { background: #f3f4f6; border-color: #d1d5db; }

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }

.btn-block { width: 100%; margin-top: 22px; padding: 12px; font-size: 15px; }

.btn-ghost { background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,0.15); color: #fff; }

.btn-danger { color: #b91c1c; }
.btn-danger:hover { background: #fee2e2; border-color: #fca5a5; }

.btn-sm { padding: 5px 12px; font-size: 13px; }

/* ===================== ШАПКА ===================== */
.app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    padding: 14px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 20px rgba(102,126,234,0.35);
}

.topbar-brand { display: flex; align-items: center; gap: 14px; }
.brand-logo { font-size: 34px; }
.brand-title { font-weight: 800; font-size: 19px; line-height: 1.1; }
.brand-sub { font-size: 12px; opacity: 0.8; }

.topbar-user { display: flex; align-items: center; gap: 14px; }
.user-email { font-size: 13px; opacity: 0.85; }

/* ===================== ВКЛАДКИ ===================== */
.tabs {
    display: flex;
    gap: 8px;
    padding: 16px 28px 0;
    background: transparent;
}

.tab {
    border: none;
    background: #fff;
    border-radius: 12px 12px 0 0;
    padding: 11px 22px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-muted);
    cursor: pointer;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.03);
    transition: all .15s;
}

.tab:hover { color: var(--text); }
.tab.active { background: var(--primary); color: #fff; }

/* ===================== КОНТЕНТ ===================== */
.content {
    flex: 1;
    padding: 22px 28px 40px;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.loading { text-align: center; color: var(--text-muted); padding: 60px 0; font-size: 15px; }

.page-title { font-size: 24px; font-weight: 800; margin-bottom: 18px; }

/* --- под-вкладки (школы/классы) --- */
.sub-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }

.sub-tab {
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 20px;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-muted);
    cursor: pointer;
    transition: all .15s;
}

.sub-tab:hover { border-color: var(--primary); color: var(--primary); }
.sub-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.count-note { color: var(--text-muted); font-size: 14px; margin-bottom: 16px; }

/* --- сетка учеников --- */
.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.student-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 18px 14px;
    box-shadow: var(--shadow);
    text-align: center;
    cursor: pointer;
    transition: transform .15s, box-shadow .15s;
    border: 2px solid transparent;
}

.student-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.avatar-circle {
    width: 80px; height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

.avatar-fallback {
    width: 80px; height: 80px;
    border-radius: 50%;
    background: #e5e7eb;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin: 0 auto;
}

.avatar-large { width: 130px; height: 130px; font-size: 52px; }

.student-name { font-size: 15px; font-weight: 700; margin-top: 10px; }
.student-class { font-size: 13px; color: var(--text-muted); margin-top: 3px; }

.card-photo-flag {
    margin-top: 10px;
    font-size: 12px;
    color: var(--warning-text);
    background: var(--warning-bg);
    border-radius: 20px;
    padding: 3px 10px;
    display: inline-block;
}

/* --- профиль ученика --- */
.profile-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 20px;
    padding: 28px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 26px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(102,126,234,0.28);
    flex-wrap: wrap;
}

.profile-header h1 { font-size: 25px; font-weight: 800; }
.profile-meta { margin-top: 7px; font-size: 15px; opacity: 0.92; }
.profile-count { margin-top: 4px; font-size: 13px; opacity: 0.7; }

.flag-row {
    background: var(--card);
    border-radius: 12px;
    padding: 12px 18px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
}

.flag-row input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); cursor: pointer; }

/* --- блоки работ по датам --- */
.work-block {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border-left: 4px solid var(--primary);
}

.work-block-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.work-date { font-size: 16px; font-weight: 700; }

.badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.badge-pending { background: var(--warning-bg); color: var(--warning-text); }
.badge-checked  { background: var(--ok-bg); color: var(--ok-text); }
.badge-graded   { background: var(--grade-bg); color: var(--grade-text); }

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 14px;
}

.photos-grid img {
    width: 100%;
    height: 190px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.10);
    transition: transform .2s;
    cursor: zoom-in;
}

.photos-grid img:hover { transform: scale(1.03); }

.work-controls {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

.control-field { display: flex; flex-direction: column; gap: 6px; }
.control-field label { font-size: 13px; font-weight: 600; color: var(--text-muted); }

.control-field input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--primary); cursor: pointer; }

.control-field select, .form-card input, .form-card textarea {
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    background: #fff;
}

.control-field select:focus, .form-card input:focus, .form-card textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

/* --- задания --- */
.hw-layout { display: grid; grid-template-columns: 1fr 340px; gap: 20px; align-items: start; }

@media (max-width: 860px) { .hw-layout { grid-template-columns: 1fr; } }

.form-card, .table-card, .stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}

.form-card h3, .table-card h3, .stat-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }

.form-card label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin: 12px 0 6px; }
.form-card input, .form-card textarea { width: 100%; }
.form-card textarea { resize: vertical; min-height: 60px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }

th {
    text-align: left;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--text-muted);
    padding: 8px 10px;
    border-bottom: 2px solid var(--border);
}

td { padding: 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }

tr:last-child td { border-bottom: none; }

.empty-note { color: var(--text-muted); font-size: 14px; text-align: center; padding: 24px 0; }

/* --- статистика --- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 20px; }

.metric { text-align: center; padding: 22px 14px; }
.metric-value { font-size: 30px; font-weight: 800; color: var(--primary); }
.metric-label { font-size: 13px; color: var(--text-muted); margin-top: 5px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .two-col { grid-template-columns: 1fr; } }

.bar-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; font-size: 14px; }
.bar-row .bar-label { width: 90px; font-weight: 600; flex-shrink: 0; }
.bar-track { flex: 1; background: #eef0f4; border-radius: 8px; height: 22px; overflow: hidden; }
.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 8px;
    min-width: 4px;
    transition: width .4s ease;
}
.bar-value { width: 34px; text-align: right; font-weight: 700; color: var(--text-muted); }

/* --- прочее --- */
.back-row { margin-bottom: 16px; }

.toast {
    position: fixed;
    bottom: 26px;
    left: 50%;
    transform: translateX(-50%);
    background: #111827;
    color: #fff;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    z-index: 100;
    animation: toast-in .25s ease;
}

.toast-error { background: #b91c1c; }

@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 12px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* --- просмотр фото на весь экран --- */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    cursor: zoom-out;
    padding: 30px;
}

.lightbox img { max-width: 100%; max-height: 100%; border-radius: 10px; }

@media (max-width: 640px) {
    .topbar { padding: 12px 16px; flex-wrap: wrap; gap: 10px; }
    .tabs { padding: 12px 16px 0; flex-wrap: wrap; }
    .content { padding: 16px 16px 32px; }
    .profile-header { padding: 20px; }
}

/* ===================== КАЛЕНДАРЬ ===================== */
.calendar-card { max-width: 640px; }
.cal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.cal-title { font-size: 18px; font-weight: 800; text-transform: capitalize; }
.cal-nav {
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 10px;
    width: 40px; height: 40px;
    font-size: 18px;
    cursor: pointer;
    color: var(--text);
    transition: all .15s;
}
.cal-nav:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.cal-nav:disabled { opacity: 0.3; cursor: default; }
.cal-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}
.cal-weekday {
    text-align: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    padding: 6px 0;
    text-transform: uppercase;
}
.cal-weekday.weekend { color: #9ca3af; }
.cal-day {
    aspect-ratio: 1;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: all .12s;
}
.cal-day:hover:not(:empty) { border-color: var(--primary); }
.cal-day.marked {
    background: #bfdbfe;               /* светло-голубой фон */
    border-color: #93c5fd;
    color: #1e3a8a;
}
.cal-day.today { box-shadow: inset 0 0 0 2px var(--primary); }
.cal-empty { border: none; background: transparent; cursor: default; }
.cal-hint {
    margin-top: 14px;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===================== ЗНАЧОК ОГЭ/ЕГЭ ===================== */
.student-card { position: relative; }
.exam-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #dbeafe;
    color: #1e40af;
    font-size: 11px;
    font-weight: 800;
    padding: 3px 9px;
    border-radius: 12px;
    letter-spacing: 0.3px;
}

/* ===================== УДАЛЕНИЕ УЧЕНИКА ===================== */
.profile-actions { margin-left: auto; }
.btn-delete {
    background: #fee2e2;
    border-color: #fca5a5;
    color: #b91c1c;
}
.btn-delete:hover { background: #fecaca; border-color: #f87171; }

/* ===================== ВХОД: ВЫБОР РОЛИ ===================== */
.role-tabs {
    display: flex;
    gap: 8px;
    margin: 18px 0 6px;
}
.role-tab {
    flex: 1;
    border: 1px solid var(--border);
    background: #f3f4f6;
    border-radius: 10px;
    padding: 10px;
    font-size: 14px;
    font-weight: 700;
    font-family: inherit;
    color: var(--text-muted);
    cursor: pointer;
    transition: all .15s;
}
.role-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ===================== ЧАСТЬ УЧЕНИКА ===================== */
.student-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 20px;
    padding: 24px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 22px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(102,126,234,0.28);
    flex-wrap: wrap;
}
.student-hero h1 { font-size: 23px; font-weight: 800; }
.student-hero .profile-meta { font-size: 15px; opacity: 0.92; margin-top: 6px; }

.btn-huge {
    display: block;
    width: 100%;
    padding: 22px;
    font-size: 19px;
    font-weight: 800;
    border-radius: 18px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(102,126,234,0.35);
    transition: transform .15s, box-shadow .15s;
    font-family: inherit;
}
.btn-huge:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(102,126,234,0.45); }

.submit-panel { max-width: 640px; }
.date-choice-grid { display: flex; flex-direction: column; gap: 10px; margin: 14px 0; }
.date-choice {
    border: 2px solid var(--border);
    background: #fff;
    border-radius: 12px;
    padding: 14px;
    font-size: 16px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    text-align: center;
    transition: all .15s;
}
.date-choice:hover { border-color: var(--primary); color: var(--primary); }

.file-drop {
    border: 2px dashed var(--border);
    border-radius: 14px;
    padding: 26px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    transition: all .15s;
    margin-top: 6px;
}
.file-drop:hover { border-color: var(--primary); color: var(--primary); }
.file-drop input { display: none; }

/* ===================== МАСТЕР РЕГИСТРАЦИИ ===================== */
.reg-steps { margin-top: 6px; text-align: left; }
.reg-step-title { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.reg-step-sub { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; }
.reg-choices { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.reg-choice {
    border: 2px solid var(--border);
    background: #fff;
    border-radius: 10px;
    padding: 12px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-align: center;
    transition: all .15s;
}
.reg-choice:hover { border-color: var(--primary); color: var(--primary); }
.reg-nav { display: flex; gap: 10px; margin-top: 6px; }
.reg-nav .btn { flex: 1; }

/* ===================== БАННЕР-ПРЕДУПРЕЖДЕНИЕ ===================== */
.app-banner {
    margin: 14px 28px 0;
    padding: 14px 20px;
    border-radius: 14px;
    background: #fef3c7;
    border: 2px solid #f59e0b;
    color: #92400e;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    max-width: 1200px;
    width: calc(100% - 56px);
    margin-left: auto;
    margin-right: auto;
    display: block;
}

/* ===================== ТАБЛИЦА ОЦЕНОК ===================== */
.grades-wrap {
    overflow-x: auto;
    background: var(--card);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 16px;
}
.grades-table { border-collapse: collapse; font-size: 13px; min-width: 100%; }
.grades-table th {
    background: #f9fafb;
    padding: 8px 6px;
    min-width: 46px;
    font-size: 11px;
    white-space: nowrap;
    border-bottom: 2px solid var(--border);
}
.grades-table td {
    border: 1px solid #e5e7eb;
    text-align: center;
    height: 44px;
    min-width: 46px;
    padding: 0 4px;
}
.g-name {
    text-align: left !important;
    padding: 8px 14px !important;
    white-space: nowrap;
    font-weight: 600;
}
.g-link { cursor: pointer; color: var(--primary); }
.g-link:hover { text-decoration: underline; }
.g-cell { cursor: pointer; font-weight: 800; font-size: 14px; }
.g-white { background: rgba(255,255,255,1); }
.g-gray  { background: rgba(156,163,175,0.35); }
.g-blue  { background: rgba(59,130,246,0.30); }
.g-green { background: rgba(34,197,94,0.40); }
td.g-sel { outline: 3px solid var(--primary); outline-offset: -3px; }
.grades-hint { font-size: 13px; color: var(--text-muted); max-width: 640px; }

/* ===================== УВЕЛИЧЕНИЕ АВАТАРКИ ===================== */
.avatar-zoom { cursor: zoom-in; display: inline-flex; border-radius: 50%; }
.avatar-zoom:hover { filter: brightness(1.05); }

/* ===================== ЧАТ ===================== */
.chat-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    padding: 16px;
}
.chat-window {
    background: #eef2f7;
    border-radius: 18px;
    width: 100%;
    max-width: 480px;
    height: min(640px, 86vh);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
.chat-head {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    padding: 14px 18px;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.chat-close { background: transparent; border: none; color: #fff; font-size: 16px; cursor: pointer; }
.chat-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.bubble {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.4;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.bubble.me { align-self: flex-end; background: #dbeafe; border-bottom-right-radius: 4px; }
.bubble.them { align-self: flex-start; background: #fff; border-bottom-left-radius: 4px; }
.bubble-meta { font-size: 11px; color: var(--text-muted); margin-top: 5px; display: flex; gap: 8px; align-items: center; justify-content: flex-end; }
.bubble-del { background: none; border: none; cursor: pointer; font-size: 12px; opacity: 0.6; }
.bubble-del:hover { opacity: 1; }
.chat-foot { display: flex; gap: 8px; padding: 12px; background: #fff; }
.chat-foot input {
    flex: 1;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 24px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
}
.chat-foot .btn { border-radius: 24px; padding: 10px 18px; }

/* ===================== НЕПРОЧИТАННЫЕ ===================== */
.unread-dot {
    position: absolute;
    top: 8px;
    left: 8px;
    min-width: 22px;
    height: 22px;
    padding: 0 5px;
    border-radius: 12px;
    background: #ef4444;
    border: 2px solid #fff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
    line-height: 18px;
    text-align: center;
    box-sizing: border-box;
    z-index: 2;
}
.badge-unread {
    display: inline-block;
    background: #ef4444;
    color: #fff;
    border-radius: 12px;
    padding: 1px 8px;
    font-size: 12px;
    font-weight: 800;
    margin-left: 6px;
}

/* ===================== ПОСЛЕДНЕЕ СООБЩЕНИЕ УЧЕНИКУ ===================== */
.last-msg-box {
    background: var(--card);
    border-left: 4px solid var(--primary);
    border-radius: 12px;
    padding: 14px 18px;
    margin-bottom: 14px;
    box-shadow: var(--shadow);
    cursor: pointer;
}
.last-msg-label { font-size: 12px; font-weight: 700; color: var(--text-muted); margin-bottom: 4px; }
.last-msg-text { font-size: 14px; line-height: 1.45; white-space: pre-wrap; }
.last-msg-time { font-size: 11px; color: var(--text-muted); margin-top: 6px; }

/* ===================== КОММЕНТАРИЙ К РАБОТЕ ===================== */
.hw-comment {
    background: rgba(219,234,254,0.6);
    border-left: 4px solid var(--primary);
    border-radius: 10px;
    padding: 10px 14px;
    margin-bottom: 14px;
    font-size: 14px;
    line-height: 1.5;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    justify-content: space-between;
}
.hw-comment-actions { display: flex; gap: 6px; flex-shrink: 0; }

/* ===================== ВСТРОЕННЫЙ ЧАТ ===================== */
.inline-chat-window {
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 18px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    height: 440px;
    background: #eef2f7;
}
.inline-chat-window .chat-head { border-radius: 0; }
.chat-close {
    background: rgba(255,255,255,0.2);
    border: none;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    border-radius: 8px;
    padding: 5px 12px;
}
.chat-close:hover { background: rgba(255,255,255,0.35); }

/* ===================== ЦЕНТРИРОВАНИЕ ВКЛАДОК (десктоп) ===================== */
.tabs {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* ===================== МНОГОСТРОЧНЫЙ ВВОД В ЧАТЕ ===================== */
.chat-foot { align-items: flex-end; }
.chat-foot textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 22px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    resize: none;
    line-height: 1.4;
    max-height: 130px;
    overflow-y: auto;
}

/* ===================== ИСТОРИЯ СООБЩЕНИЙ КЛАССУ ===================== */
.hist-row { border-bottom: 1px solid var(--border); padding: 10px 0; }
.hist-row:last-child { border-bottom: none; }
.hist-date { font-size: 12px; color: var(--text-muted); font-weight: 700; margin-bottom: 4px; }
.hist-text { font-size: 14px; line-height: 1.5; white-space: pre-wrap; }

/* ===================== ИСТОРИЯ: КНОПКА УДАЛЕНИЯ ===================== */
.hist-date { display: flex; justify-content: space-between; align-items: center; gap: 10px; }

/* ===================== ПОВОРОТ ФОТО ===================== */
.photo-wrap { position: relative; display: block; }
.rotate-btn {
    position: absolute;
    left: 6px;
    bottom: 6px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: rgba(17, 24, 39, 0.65);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.85;
    transition: opacity .15s, background .15s;
    z-index: 2;
}
.rotate-btn:hover { background: rgba(17, 24, 39, 0.92); opacity: 1; }
.rotate-btn:disabled { cursor: default; }

/* ===================== ГАЛОЧКА "ПРОВЕРЕНО" (ученик) ===================== */
.checked-tick {
    display: inline-block;
    color: #059669;
    font-weight: 800;
    font-size: 13px;
    margin-left: 8px;
}