/* ============ CSS ПЕРЕМЕННЫЕ ============ */
:root {
    --primary: #667eea;
    --primary-hover: #5a67d8;
    --primary-dark: #764ba2;
    --success: #48bb78;
    --success-hover: #38a169;
    --warning: #ed8936;
    --danger: #fc8181;
    --danger-hover: #f56565;
    --gray: #a0aec0;
    --gray-hover: #718096;

    --text: #333;
    --text-muted: #666;
    --text-light: #999;

    --bg-light: #f3efe7;
    --bg-hover: #eee7da;
    --bg-white: #faf6ee;

    --border: #e0e0e0;
    --border-light: #eee;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
    --shadow-md: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.3);

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 15px;
    --radius-2xl: 20px;
}

/* ============ БАЗОВЫЕ СТИЛИ ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #8a7a5c 0%, #5c5244 100%);
    min-height: 100vh;
    padding: 20px;
}

/* ============ ЭКРАН ВХОДА ============ */
.login-screen { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    width: 100%;
    max-width: 400px;
}
.login-box h2 { margin-bottom: 30px; color: var(--text); }
.login-box input {
    display: block;
    width: 100%;
    margin-bottom: 15px;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 16px;
}
.login-box input:focus { outline: none; border-color: var(--primary); }
.login-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
}
.login-btn:hover { background: var(--primary-hover); }

/* ============ ОСНОВНОЕ ПРИЛОЖЕНИЕ ============ */
.container {
    width: calc(100vw - 40px);
    max-width: min(1800px, 100%);
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    padding: 30px;
    box-sizing: border-box;
}
@media (min-width: 1600px) { .container { max-width: 1600px; } }
@media (min-width: 1920px) { .container { max-width: 1800px; } }

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}
.header h1 { font-size: 1.5em; color: var(--text); font-weight: 700; letter-spacing: -0.01em; }
.user-bar { display: flex; align-items: center; gap: 15px; }
.logout-btn {
    padding: 8px 16px;
    background: var(--bg-white);
    color: var(--text-muted);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.15s;
}
.logout-btn:hover {
    background: #fff5f5;
    color: var(--danger-hover);
    border-color: var(--danger);
}

/* ============ ФИНАНСОВАЯ ПАНЕЛЬ ============ */
.finance-panel {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}
.finance-item {
    text-align: center;
    padding: 10px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.finance-label {
    font-size: 0.8em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.finance-value { font-size: 1.8em; font-weight: 700; color: var(--success); }
.finance-value.week-total { color: var(--primary); font-size: 2.2em; }
.finance-value.month-total { color: #e53e3e; font-size: 2.2em; }

/* ============ НАВИГАЦИЯ ============ */
.week-navigation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.week-navigation button {
    padding: 10px 20px;
    background: var(--bg-white);
    color: var(--text);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
    transition: background 0.15s, border-color 0.15s;
}
.week-navigation button:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: none;
}
.week-range {
    font-size: 1.2em;
    font-weight: 600;
    min-width: 250px;
    text-align: center;
}

/* ============ ЛЕГЕНДА ============ */
.status-legend {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.legend-item { display: flex; align-items: center; gap: 5px; }
.legend-color { width: 20px; height: 20px; border-radius: 5px; }

/* ============ ПАНЕЛЬ УПРАВЛЕНИЯ ============ */
.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius-xl);
}
.input-group { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
input, select, button {
    padding: 10px 15px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
input:focus, select:focus { outline: none; border-color: var(--primary); }
button {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
}
button:hover { background: var(--primary-hover); transform: none; }

/* ============ СЕТКА РАСПИСАНИЯ ============ */
.schedule {
    display: flex;
    gap: 15px;
    overflow-x: auto;
    padding-bottom: 15px;
}
.day-column {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: 15px;
    min-width: 180px;
    flex: 1;
    min-height: 400px;
    flex-shrink: 0;
}
.day-column.today {
    background: var(--bg-hover);
    box-shadow: 0 0 0 3px var(--primary);
}
.day-header {
    font-weight: 700;
    text-align: center;
    margin-bottom: 5px;
    padding: 10px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
}
.day-date {
    text-align: center;
    font-size: 0.9em;
    color: var(--text-muted);
    margin-bottom: 5px;
    font-weight: 600;
}
.day-total {
    text-align: center;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 10px;
    padding: 5px;
    background: #f0fff4;
    border-radius: var(--radius-md);
    border: 1px dashed var(--success);
}
.events-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 200px;
}

/* ============ КАРТОЧКА СОБЫТИЯ ============ */
.event {
    padding: 12px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    color: white;
    font-weight: 600;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: all 0.15s;
    position: relative;
    word-wrap: break-word;
    animation: slideIn 0.3s ease-out;
}
@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}
.event:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.event:hover { transition: box-shadow 0.15s; }
.event .delete-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(0,0,0,0.3);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s;
}
.event:hover .delete-btn { opacity: 1; }
.event .repeat-badge {
    position: absolute;
    top: 5px;
    left: 5px;
    background: rgba(0,0,0,0.3);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 10px;
}
.event .price-badge {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: rgba(0,0,0,0.35);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 700;
    color: #fff !important;
}

/* ============ ПОЛОСА ПРОКРУТКИ ============ */
.schedule::-webkit-scrollbar { height: 8px; }
.schedule::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 10px; }
.schedule::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 10px; }

/* ============ КОНТЕКСТНОЕ МЕНЮ ============ */
.context-menu {
    position: fixed;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 5px 25px rgba(0,0,0,0.3);
    z-index: 1000;
    min-width: 200px;
    overflow: hidden;
}
.context-item {
    padding: 12px 20px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}
.context-item:hover { background: #f0f0ff; }
.context-item:first-child { border-bottom: 1px solid var(--border-light); }

/* ============ МОДАЛЬНОЕ ОКНО ============ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-content {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-light);
}
.modal-header h2 { margin: 0; }
.modal-close {
    font-size: 28px;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.2s;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 20px; }
.modal-body label {
    display: block;
    margin-top: 15px;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
    font-size: 0.9em;
}
.modal-body input, .modal-body select, .modal-body textarea {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
}
.modal-body textarea { resize: vertical; }
.modal-body input:focus, .modal-body select:focus, .modal-body textarea:focus {
    outline: none;
    border-color: var(--primary);
}
.save-btn {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    background: var(--success);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.15s;
}
.save-btn:hover { background: var(--success-hover); }

/* ============ СЕКЦИЯ УЧЕНИКОВ ============ */
.students-section {
    padding: 12px 15px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 15px;
    font-size: 14px;
}
.nav-link {
    padding: 8px 16px;
    background: var(--bg-white);
    color: var(--primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    transition: all 0.15s;
    border: 2px solid var(--border);
}
.nav-link:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: none;
}.section-card {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}
.section-card h3 { margin-bottom: 5px; color: var(--text); }

/* ============ МАЛЕНЬКИЕ КНОПКИ ============ */
/* Размеры выровнены с .nav-link: единая высота и радиус в шапке */
.btn-sm {
    padding: 8px 16px;
    color: var(--text);
    background: var(--bg-white);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.15s;
    text-decoration: none;
}
.btn-sm:hover { background: var(--bg-hover); transform: none; }
/* Яркие — только для ключевых действий */
.btn-sm.green { background: var(--bg-white); color: var(--text); border-color: var(--border); }
.btn-sm.green:hover { background: var(--bg-hover); border-color: var(--success); }
.btn-sm.blue { background: var(--bg-white); color: var(--text); border-color: var(--border); }
.btn-sm.blue:hover { background: var(--bg-hover); border-color: var(--primary); }
.btn-sm.red { background: #fff; color: var(--danger-hover); border-color: var(--border); }
.btn-sm.red:hover { background: #fff5f5; border-color: var(--danger); }
.btn-sm.gray { background: var(--bg-light); color: var(--text-muted); border-color: var(--border); }
.btn-sm.gray:hover { background: var(--bg-hover); color: var(--text); }

/* ============ КАРТОЧКА УЧЕНИКА ============ */
.student-info { display: flex; gap: 15px; align-items: center; }
.student-name { font-weight: 600; font-size: 16px; }
.student-subject {
    color: var(--text-muted);
    font-size: 14px;
    background: #e2e8f0;
    padding: 3px 10px;
    border-radius: 20px;
}
.student-edit { display: flex; gap: 8px; flex: 1; }

/* ============ КАРТОЧКА ОТЧЁТА ============ */
.report-card {
    padding: 15px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 10px;
    border-left: 4px solid var(--primary);
}
.report-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
}
.report-student { font-weight: 700; color: var(--primary); }
.report-date { color: var(--text-light); }
.report-topic { font-weight: 600; margin-bottom: 5px; }
.report-body { font-size: 14px; color: #555; }
.report-grade {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
    margin-top: 8px;
}
.grade-5 { background: #c6f6d5; color: #22543d; }
.grade-4 { background: #bee3f8; color: #2a4365; }
.grade-3 { background: #fefcbf; color: #744210; }
.grade-2 { background: #fed7d7; color: #822727; }

/* ============ КАРТОЧКА УЧЕНИКА (student.html) ============ */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-light);
    flex-wrap: wrap;
    gap: 15px;
}
.card-header h1 { font-size: 1.8em; color: var(--text); margin: 0; }
.card-header-info {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 8px;
}
.track-badge {
    display: inline-block;
    padding: 5px 14px;
    background: var(--primary);
    color: white;
    border-radius: 20px;
    font-weight: 600;
    font-size: 13px;
}
.card-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 25px;
}
.tasks-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}
.tasks-table th {
    background: var(--primary);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
}
.tasks-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-light);
    vertical-align: top;
}
.tasks-table tr:last-child td { border-bottom: none; }
.tasks-table tr:hover { background: var(--bg-light); }
.tasks-table select {
    width: 100%;
    padding: 6px 10px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--bg-white);
}
.task-comment {
    width: 100%;
    min-height: 38px;
    padding: 8px 10px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-family: inherit;
    resize: none;
    overflow: hidden;
    line-height: 1.4;
}
.slice-card {
    padding: 12px 15px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 10px;
    border-left: 4px solid var(--warning);
}
.slice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}
.slice-date { font-size: 13px; color: var(--text-muted); font-weight: 600; }
.slice-result {
    font-weight: 700;
    color: var(--warning);
    font-size: 15px;
    flex: 1;
    text-align: right;
}
.slice-comment {
    font-size: 13px;
    color: #555;
    white-space: pre-wrap;
    margin-top: 4px;
}
.general-message {
    padding: 30px;
    text-align: center;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    color: var(--text-muted);
    font-size: 15px;
}

/* ============ ГЛАВЫ И СТРАНИЦЫ КУРСА ============ */
.chapter-block {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    border-left: 4px solid var(--primary);
}
.chapter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}
.chapter-header h4 { margin: 0; color: var(--text); font-size: 1.1em; }
.chapter-actions { display: flex; gap: 6px; }
.pages-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 10px;
}
.page-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    margin-bottom: 6px;
    transition: all 0.2s;
    cursor: pointer;
    flex-wrap: wrap;
    gap: 8px;
}
.page-item:hover {
    background: var(--bg-hover);
    transform: translateX(4px);
}
.page-arrow { color: var(--primary); font-weight: 700; }

/* ============ БЛОКИ РЕДАКТОРА ============ */
.block-item {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 15px;
    margin-bottom: 12px;
    border: 2px solid var(--border);
}
.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-muted);
}
.ql-container { font-family: inherit; font-size: 14px; }
.ql-editor { min-height: 100px; }

/* ============ ПРОГРЕСС КУРСА ============ */
.course-progress-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}
.course-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 10px;
    overflow: hidden;
}
.course-progress-fill {
    height: 100%;
    border-radius: 10px;
    transition: width 0.3s;
}
.course-progress-text {
    font-weight: 700;
    font-size: 14px;
    color: var(--text);
    min-width: 40px;
    text-align: right;
}
.chapter-progress-text {
    font-weight: 700;
    font-size: 14px;
    color: var(--primary);
}

/* ============ ПРОГРЕСС-БАР КУРСА ============ */
.course-progress-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 18px;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--border-light);
}
.course-progress-header .label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}
.course-progress-header .bar-wrap {
    flex: 1;
    height: 10px;
    background: var(--border);
    border-radius: 10px;
    overflow: hidden;
}
.course-progress-header .bar-fill {
    height: 100%;
    border-radius: 10px;
    transition: width 0.4s ease;
    background: var(--border);
}
.course-progress-header .bar-fill.in-progress { background: var(--warning); }
.course-progress-header .bar-fill.done { background: var(--success); }
.course-progress-header .percent {
    font-weight: 700;
    font-size: 14px;
    color: var(--text);
    min-width: 45px;
    text-align: right;
}

/* ============ БЛОКИ ТЕОРИИ ============ */
.theory-block { margin-bottom: 20px; }
.theory-block img { max-width: 100%; border-radius: var(--radius-lg); margin: 10px 0; }
.theory-block pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 15px;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.5;
}

/* ============ ТЕСТ ============ */
.test-question {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    border-left: 4px solid var(--primary);
}
.test-question h4 { margin-bottom: 12px; color: var(--text); }
.test-question .multi-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
}
.answer-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    margin-bottom: 6px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}
.answer-option:hover { border-color: var(--primary); background: #f0f4ff; }
.answer-option.selected { border-color: var(--primary); background: var(--bg-hover); }
.answer-option.correct { border-color: var(--success); background: #c6f6d5; }
.answer-option.wrong { border-color: var(--danger); background: #fed7d7; }
.answer-option input { width: auto; margin: 0; }
.test-result {
    padding: 15px;
    border-radius: var(--radius-lg);
    text-align: center;
    font-weight: 700;
    font-size: 1.1em;
    margin-top: 15px;
}
.test-result.correct { background: #c6f6d5; color: #22543d; }
.test-result.wrong { background: #fed7d7; color: #822727; }

/* ============ ПРАКТИКА (Python) ============ */
.py-output {
    margin-top: 10px;
    padding: 12px;
    background: #1e1e1e;
    color: #0f0;
    font-family: monospace;
    border-radius: var(--radius-md);
    white-space: pre-wrap;
    min-height: 40px;
    display: none;
}
.practice-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}
.practice-buttons .save-btn { flex: 2; }
.practice-buttons .btn-sm { flex: 1; padding: 12px; }
.draft-indicator {
    display: inline-block;
    padding: 3px 10px;
    background: var(--warning);
    color: white;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}
.practice-hint {
    background: #fffbea;
    border-left: 4px solid var(--warning);
    padding: 12px;
    border-radius: var(--radius-sm);
    margin: 15px 0;
    font-size: 14px;
}

/* ============ НАВИГАЦИЯ prev/next ============ */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-top: 25px;
    flex-wrap: wrap;
}
.nav-buttons button {
    flex: 1;
    min-width: 120px;
    padding: 12px 20px;
    text-align: center;
}

/* ============ БЕЙДЖ «ПРОЙДЕНО» ============ */
.completed-badge {
    display: inline-block;
    padding: 5px 14px;
    background: var(--success);
    color: white;
    border-radius: 20px;
    font-weight: 600;
    font-size: 13px;
}
.completed-badge.in-progress { background: var(--warning); }

/* ============ МЕТА-ИНФО КУРСА ============ */
.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 10px 0;
}
.course-badge {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-hover);
    color: #2a4365;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.course-badge.empty { background: #f0f0f0; color: var(--text-light); }

/* ============ ВИДЕО В ТЕОРИИ ============ */
.video-embed {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
}
.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ============ KATEX ============ */
.katex-display {
    margin: 0;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 4px 0;
}

/* ============ QUILL КОНТЕНТ ============ */
.ql-align-center { text-align: center; }
.ql-align-right { text-align: right; }
.ql-align-justify { text-align: justify; }
.ql-indent-1 { padding-left: 3em; }
.ql-indent-2 { padding-left: 6em; }
.ql-indent-3 { padding-left: 9em; }
.ql-indent-4 { padding-left: 12em; }
.ql-indent-5 { padding-left: 15em; }
.ql-indent-6 { padding-left: 18em; }
.ql-indent-7 { padding-left: 21em; }
.ql-indent-8 { padding-left: 24em; }
pre.ql-syntax {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 15px;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre-wrap;
}
blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 15px;
    margin: 10px 0;
    color: #555;
    font-style: italic;
}
.theory-block h1, .question-text h1 { font-size: 1.8em; margin: 15px 0 10px; font-weight: 700; }
.theory-block h2, .question-text h2 { font-size: 1.4em; margin: 12px 0 8px; font-weight: 700; }
.theory-block h3, .question-text h3 { font-size: 1.2em; margin: 10px 0 6px; font-weight: 600; }
.theory-block ul, .theory-block ol, .question-text ul, .question-text ol { margin: 8px 0 8px 20px; }
.theory-block li, .question-text li { margin-bottom: 4px; }
.theory-block a, .question-text a { color: var(--primary); text-decoration: underline; }

/* ============ КАРТА КУРСА ============ */
.course-layout, .editor-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    align-items: start;
}
.course-sidebar {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 16px;
    border: 1px solid var(--border-light);
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}
.course-sidebar h3 { font-size: 15px; margin-bottom: 12px; color: var(--text); }
.sidebar-chapter { margin-bottom: 12px; }
.sidebar-chapter-title {
    font-weight: 700;
    font-size: 12px;
    color: var(--primary);
    padding: 6px 4px;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.sidebar-page {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text);
    text-decoration: none;
    margin-bottom: 2px;
    cursor: pointer;
    transition: background 0.15s;
}
.sidebar-page:hover { background: var(--bg-hover); }
.sidebar-page.active { background: var(--primary); color: white; font-weight: 600; }
.sidebar-page.active .sidebar-page-icon, .sidebar-page.active .sidebar-page-status { color: white; }
.sidebar-page.completed .sidebar-page-title { color: var(--success); }
.sidebar-page.completed.active .sidebar-page-title { color: white; }
.sidebar-page-icon { font-size: 14px; flex-shrink: 0; }
.sidebar-page-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-page-status { margin-left: auto; font-size: 12px; color: var(--success); font-weight: 700; }
.editor-main, .course-main { min-width: 0; }

/* ============ МОБИЛЬНАЯ ВЕРСИЯ ============ */
@media (max-width: 968px) {
    .card-layout { grid-template-columns: 1fr; }
    .course-layout, .editor-layout { grid-template-columns: 1fr; }
    .course-sidebar { position: static; max-height: 300px; margin-bottom: 16px; }
}
@media (max-width: 768px) {
    body { padding: 8px; }
    .container { padding: 12px; border-radius: 12px; }
    .header { flex-direction: column; align-items: stretch; gap: 8px; margin-bottom: 12px; }
    .header h1 { font-size: 1.4em; text-align: center; }
    .user-bar { flex-wrap: wrap; justify-content: center; gap: 6px; font-size: 13px; }
    .user-bar .nav-link, .user-bar .btn-sm, .user-bar .logout-btn { padding: 6px 10px; font-size: 12px; }
    .finance-panel { padding: 8px; gap: 6px; }
    .finance-item { padding: 6px 8px; flex: 1; min-width: 90px; }
    .finance-label { font-size: 0.7em; }
    .finance-value { font-size: 1.2em; }
    .finance-value.week-total, .finance-value.month-total { font-size: 1.4em; }
    .week-navigation { flex-wrap: wrap; gap: 6px; }
    .week-navigation button { padding: 8px 12px; font-size: 13px; }
    .week-range { font-size: 1em; min-width: auto; width: 100%; text-align: center; }
    .status-legend { gap: 8px; font-size: 12px; }
    .legend-color { width: 14px; height: 14px; }
    .controls { padding: 10px; gap: 6px; }
    .input-group { flex-direction: column; width: 100%; gap: 6px; }
    .input-group select, .input-group input { width: 100%; font-size: 14px; padding: 8px 10px; }
    .controls > button { width: 100%; padding: 10px; }
    .schedule { gap: 8px; }
    .day-column { min-width: 130px; padding: 8px; min-height: 300px; }
    .day-header { padding: 6px; font-size: 13px; }
    .day-date { font-size: 0.8em; }
    .day-total { font-size: 12px; padding: 3px; }
    .event { padding: 8px; font-size: 12px; }
    .student-card { flex-direction: column; align-items: stretch; gap: 8px; padding: 10px; }
    .student-info { flex-direction: column; align-items: flex-start; gap: 6px; }
    .student-edit { flex-direction: column; width: 100%; }
    .student-edit input, .student-edit select { width: 100% !important; min-width: 0 !important; }
    .form-row { flex-direction: column; }
    .form-row input, .form-row select, .form-row button { width: 100% !important; min-width: 0 !important; }
    .modal-content { width: 96%; max-width: none; max-height: 95vh; }
    .modal-body { padding: 14px; }
    .modal-header { padding: 14px; }
    .modal-header h2 { font-size: 1.1em; }
    .save-btn { padding: 12px; font-size: 15px; }
    .tasks-table th, .tasks-table td { padding: 6px 4px; font-size: 12px; }
    .tasks-table select, .task-comment { font-size: 12px; }
    .card-header { flex-direction: column; gap: 8px; padding-bottom: 12px; }
    .card-header h1 { font-size: 1.4em; }
    .slice-card { padding: 10px; }
    .slice-header { font-size: 12px; }
    .report-card { padding: 10px; font-size: 13px; }
    .login-box { padding: 24px 20px; border-radius: 14px; }
    .login-box h2 { font-size: 1.3em; }
    .course-progress-header { flex-wrap: wrap; padding: 10px 12px; }
    .course-progress-header .label { font-size: 12px; }
    .course-progress-header .percent { font-size: 13px; }
    .nav-buttons button { min-width: 100px; padding: 10px 12px; font-size: 13px; }
    .practice-buttons { flex-direction: column; }
    .practice-buttons .save-btn, .practice-buttons .btn-sm { width: 100%; }
}
@media (max-width: 400px) {
    .header h1 { font-size: 1.2em; }
    .finance-value { font-size: 1em; }
    .finance-value.week-total, .finance-value.month-total { font-size: 1.2em; }
    .week-navigation button { padding: 6px 8px; font-size: 12px; }
    .day-column { min-width: 110px; }
    .student-actions .btn-sm { font-size: 11px; padding: 6px 2px; }
}

/* ============ МОДАЛКА УДАЛЕНИЯ СОБЫТИЯ ============ */
.delete-buttons { display: flex; flex-direction: column; gap: 8px; }
.delete-buttons button {
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: white;
}
.btn-delete-single { background: var(--warning); }
.btn-delete-single:hover { background: #dd6b20; }
.btn-delete-all { background: var(--danger); }
.btn-delete-all:hover { background: var(--danger-hover); }
.btn-cancel-delete { background: var(--gray); }
.btn-cancel-delete:hover { background: var(--gray-hover); }

/* ============ УТИЛИТАРНЫЕ КЛАССЫ ============ */
.row-flex { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.col-flex { display: flex; flex-direction: column; gap: 8px; }
.mt-5 { margin-top: 5px; }
.mt-10 { margin-top: 10px; }
.mt-15 { margin-top: 15px; }
.mt-20 { margin-top: 20px; }
.mb-5 { margin-bottom: 5px; }
.mb-10 { margin-bottom: 10px; }
.mb-15 { margin-bottom: 15px; }
.mb-20 { margin-bottom: 20px; }
.mr-10 { margin-right: 10px; }
.ml-5 { margin-left: 5px; }
.input-inline {
    padding: 4px 8px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    flex: 1;
    min-width: 100px;
}
.input-inline.narrow { min-width: 80px; }
.input-inline.wide { min-width: 140px; }
.form-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.section-header-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.consent-row { display: flex; gap: 10px; margin-top: 15px; }
.consent-row input[type="checkbox"] { width: auto; }
.consent-row label { font-weight: normal; font-size: 13px; }
.hint-text { font-size: 12px; color: var(--text-muted); margin-top: 5px; }
.hint-text b { color: var(--text); }
.info-block { font-size: 13px; margin-top: 5px; color: #000; }
.info-block b { color: #000; }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; }
.hidden { display: none !important; }
.login-btn-demo { background: var(--warning); margin-top: 10px; }
.login-btn-demo:hover { background: #dd6b20; }

/* ============ КАРТОЧКА УЧЕНИКА — доп. стили ============ */
.card-loading { text-align: center; padding: 40px; color: var(--text-light); }
.modal-content.modal-md { max-width: 500px; }
.track-warning {
    margin-top: 15px;
    padding: 12px;
    background: #fff5f5;
    border-left: 4px solid var(--danger);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: #822727;
}
.form-error { color: red; margin-top: 10px; font-size: 13px; }
.task-comment-view { white-space: pre-wrap; }
.empty-text { color: var(--text-light); }

/* ============ DRIVER.JS ============ */
.driver-popover {
    border-radius: 12px !important;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3) !important;
    max-width: 380px !important;
    font-family: inherit !important;
}
.driver-popover * { font-family: inherit !important; }
.driver-popover-title { font-size: 16px !important; font-weight: 700 !important; color: var(--text) !important; margin-bottom: 8px !important; }
.driver-popover-description { font-size: 14px !important; line-height: 1.5 !important; color: var(--text-muted) !important; }
.driver-popover-progress-text { font-size: 12px !important; color: var(--text-light) !important; }
.driver-popover-next-btn, .driver-popover-prev-btn {
    background: var(--primary) !important;
    color: white !important;
    border: none !important;
    border-radius: 8px !important;
    padding: 8px 16px !important;
    font-weight: 600 !important;
    font-size: 13px !important;
    cursor: pointer !important;
    text-shadow: none !important;
    font-family: inherit !important;
}
.driver-popover-next-btn:hover, .driver-popover-prev-btn:hover { background: var(--primary-hover) !important; }
.driver-popover-close-btn { color: var(--text-light) !important; }
.driver-active-element { outline: 3px solid var(--primary) !important; outline-offset: 4px !important; border-radius: 8px !important; }
.driver-overlay { background: rgba(0, 0, 0, 0.55) !important; }
.help-menu-list { display: flex; flex-direction: column; gap: 8px; }
.help-btn { width: 100%; padding: 12px 16px !important; text-align: left; font-size: 14px !important; font-weight: 600 !important; }

/* ============ КАРТОЧКА УЧЕНИКА — новая вёрстка ============ */
.student-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 15px 18px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    transition: background 0.15s, border-color 0.15s;
    border: 1px solid transparent;
}
.student-card:hover { background: var(--bg-hover); border-color: var(--primary); }
.student-info-top { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 6px; }
.student-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    margin-top: 4px;
}
.btn-student-action {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 600;
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}
.btn-student-action:hover { transform: none; box-shadow: none; }
.btn-student-action.green { background: var(--bg-white); color: var(--text); border: 2px solid var(--border); }
.btn-student-action.green:hover { background: var(--bg-hover); border-color: var(--success); }
.btn-student-action.blue { background: var(--bg-white); color: var(--text); border: 2px solid var(--border); }
.btn-student-action.blue:hover { background: var(--bg-hover); border-color: var(--primary); }
.btn-student-action.red { background: #fff; color: var(--danger-hover); border: 2px solid var(--border); }
.btn-student-action.red:hover { background: #fff5f5; border-color: var(--danger); }
@media (max-width: 768px) {
    .student-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
    .btn-student-action { justify-content: center; padding: 8px 6px; font-size: 12px; }
}
@media (max-width: 400px) {
    .student-actions { grid-template-columns: 1fr; }
}

/* ============ CODEMIRROR ============ */
.CodeMirror {
    font-family: 'Consolas', 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    height: auto;
    min-height: 200px;
    border-radius: 8px;
}
.CodeMirror-gutters { border-right: 1px solid #333; }
.CodeMirror-scroll::-webkit-scrollbar { width: 8px; height: 8px; }
.CodeMirror-scroll::-webkit-scrollbar-thumb { background: #555; border-radius: 4px; }
.CodeMirror-scroll::-webkit-scrollbar-track { background: #2a2a2a; }
.practice-buttons .save-btn { background: var(--success); }

/* ============ ВАРИАНТЫ ============ */
#hwVariantBlock {
    margin-top: 15px;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}
#hwVariantBlock > label { display: block; margin-bottom: 8px; font-weight: 600; color: #555; font-size: 0.9em; }
#hwVariantBlock button { font-weight: 600; }
#hwSelectedVariant {
    background: #f0fff4;
    border-radius: 8px;
    padding: 12px;
    margin-top: 8px;
    border: 1px dashed var(--success);
}
.selected-variant-header { font-size: 14px; margin-bottom: 8px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
.selected-variant-tasks { max-height: 200px; overflow-y: auto; font-size: 13px; }
.selected-variant-task { padding: 4px 0; border-bottom: 1px dashed #c6f6d5; color: #333; }
.selected-variant-task:last-child { border-bottom: none; }
#variantLibraryList { margin-top: 10px; }
.variant-library-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: 10px;
    border-left: 4px solid var(--primary);
    transition: all 0.2s;
}
.variant-library-item:hover { background: var(--bg-hover); }
.variant-library-info { flex: 1; min-width: 0; }
.variant-library-title { font-weight: 700; font-size: 15px; color: var(--text); margin-bottom: 2px; }
.variant-library-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.variant-library-meta { font-size: 12px; color: var(--text-light); }
.variant-library-actions { display: flex; gap: 6px; flex-shrink: 0; }
.variant-library-actions button { white-space: nowrap; }
#variantEditorModal .modal-content { max-width: 800px; }
#variantEditorModal .modal-body { display: flex; flex-direction: column; }
#variantEditorModal label { margin-top: 15px; }
#variantEditorModal label:first-of-type { margin-top: 0; }
.variant-editor-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    margin-bottom: 8px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-light);
}
.variant-editor-section-header h4 { margin: 0; color: var(--text); }
.variant-editor-footer {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-light);
    align-items: center;
    justify-content: flex-end;
}
.variant-editor-footer .save-btn { width: auto !important; margin-top: 0 !important; padding: 10px 20px !important; }
.variant-task-item {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 12px 15px;
    margin-bottom: 10px;
    border-left: 4px solid var(--primary);
}
.variant-task-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; flex-wrap: wrap; gap: 8px; }
.variant-task-num { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 0.5px; }
.variant-task-actions { display: flex; gap: 4px; }
.variant-task-actions button { padding: 4px 8px; font-size: 12px; }
.variant-task-question { font-size: 14px; color: var(--text); margin-bottom: 6px; line-height: 1.4; white-space: pre-wrap; }
.variant-task-expected { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.variant-task-expected code { background: #fff; padding: 2px 6px; border-radius: 4px; border: 1px solid var(--border); font-family: monospace; }
.variant-task-hint { font-size: 12px; color: var(--warning); background: #fffbea; padding: 4px 8px; border-radius: 4px; margin-top: 6px; }
.vt-file-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 10px; background: #f0f0f0; border-radius: 6px; margin-bottom: 4px; font-size: 12px; }
.vt-file-row span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.variant-view-task {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 12px 15px;
    margin-bottom: 10px;
    border-left: 4px solid var(--primary);
}
.variant-view-task-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; font-size: 13px; font-weight: 700; color: var(--text-muted); }
.variant-view-question { font-size: 14px; margin-bottom: 8px; white-space: pre-wrap; }
.variant-view-answer { font-size: 13px; padding: 6px 10px; background: #fff; border-radius: 6px; margin-top: 6px; border-left: 3px solid var(--success); }
.variant-view-answer code { font-family: monospace; background: #f8f9fa; padding: 2px 6px; border-radius: 4px; }
.variant-view-output { font-size: 12px; margin-top: 6px; color: var(--text-muted); }
.variant-view-output pre { background: #1e1e1e; color: #0f0; padding: 8px; border-radius: 6px; margin-top: 4px; font-size: 12px; overflow-x: auto; white-space: pre-wrap; }
@media (max-width: 768px) {
    .variant-library-item { flex-direction: column; align-items: stretch; }
    .variant-library-actions { justify-content: flex-end; }
    .variant-editor-footer { flex-direction: column-reverse; }
    .variant-editor-footer button { width: 100% !important; }
    .variant-task-header { flex-direction: column; align-items: flex-start; }
    .variant-task-actions { width: 100%; justify-content: flex-end; }
}

/* ============ ВАРИАНТ У УЧЕНИКА ============ */
.variant-progress-wrap { margin-bottom: 15px; }
.variant-progress-info { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.variant-progress-bar-outer { height: 8px; background: var(--border); border-radius: 8px; overflow: hidden; }
.variant-progress-bar-inner { height: 100%; background: var(--primary); border-radius: 8px; transition: width 0.3s; }
.variant-task-badge { display: inline-block; padding: 4px 12px; background: var(--bg-hover); color: var(--primary); border-radius: 16px; font-size: 12px; font-weight: 700; margin-bottom: 10px; }
.variant-question { font-size: 1.05em; line-height: 1.5; margin-bottom: 12px; white-space: pre-wrap; }
.variant-files { margin-bottom: 12px; }
.variant-answer-area { margin-top: 15px; padding-top: 15px; border-top: 1px solid var(--border-light); }
.variant-answer-area label { display: block; margin-bottom: 6px; font-weight: 600; color: #555; font-size: 0.9em; }
.parent-hw-item { padding: 12px 15px; background: var(--bg-light); border-radius: var(--radius-lg); margin-bottom: 10px; border-left: 4px solid var(--primary); }
.parent-hw-header { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 4px; flex-wrap: wrap; }
.parent-hw-header > span:first-child { font-size: 14px; }
.parent-hw-header > span:last-child { font-size: 13px; white-space: nowrap; }

/* ============ ВИДЕОКОНФЕРЕНЦИЯ ============ */
.video-page { background: #1a202c; min-height: 100vh; margin: 0; padding: 0; display: flex; flex-direction: column; }
.video-loading { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; color: white; }
.spinner { border: 4px solid rgba(255,255,255,0.3); border-top: 4px solid #667eea; border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; margin-top: 20px; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.video-container { display: flex; flex-direction: column; height: 100vh; padding: 10px; box-sizing: border-box; }
.video-status { text-align: center; padding: 10px; background: rgba(255,255,255,0.1); color: white; border-radius: 8px; margin-bottom: 10px; font-weight: 600; transition: all 0.3s; }
.video-status.success { background: #48bb78; color: #fff; }
.video-status.error { background: #f56565; color: #fff; }
.video-status.warning { background: #ed8936; color: #fff; }
.video-grid { display: flex; gap: 10px; flex: 1; min-height: 0; }
.video-wrapper { position: relative; background: #000; border-radius: 12px; overflow: hidden; }
.remote-wrapper { flex: 3; }
.local-wrapper { flex: 1; max-width: 300px; }
.video-wrapper video { width: 100%; height: 100%; object-fit: cover; }
.video-label { position: absolute; bottom: 10px; left: 10px; background: rgba(0,0,0,0.6); color: white; padding: 5px 10px; border-radius: 6px; font-size: 12px; }
.video-controls { display: flex; justify-content: center; gap: 15px; padding: 15px; background: rgba(255,255,255,0.05); border-radius: 12px; margin-top: 10px; }
.video-controls button { width: 50px; height: 50px; border-radius: 50%; border: none; background: #2d3748; color: white; font-size: 20px; cursor: pointer; transition: all 0.2s; display: flex; align-items: center; justify-content: center; }
.video-controls button:hover { background: #4a5568; transform: scale(1.05); }
.video-controls button.muted { background: #f56565; }
.video-controls button.active { background: #48bb78; }
.video-controls .end-call-btn { background: #f56565; }
.video-controls .end-call-btn:hover { background: #e53e3e; }
@media (max-width: 768px) {
    .video-grid { flex-direction: column; }
    .local-wrapper { max-width: 100%; }
    .video-controls button { width: 40px; height: 40px; font-size: 16px; }
}

/* ============ НОВЫЙ ЭКРАН УЧЕНИКОВ ============ */
.students-layout { display: grid; grid-template-columns: 280px 1fr; gap: 20px; align-items: start; }
.students-sidebar { background: var(--bg-light); border-radius: 12px; padding: 15px; height: calc(100vh - 150px); overflow-y: auto; border: 1px solid var(--border-light); }
.sidebar-student-item { padding: 10px 12px; border-radius: 8px; cursor: pointer; margin-bottom: 4px; transition: all 0.15s; border-left: 3px solid transparent; }
.sidebar-student-item:hover { background: var(--bg-hover); }
.sidebar-student-item.active { background: var(--primary); color: white; border-left-color: #fff; }
.sidebar-student-item .sub-text { font-size: 11px; opacity: 0.8; display: block; }
.student-detail-area { background: var(--bg-white); border-radius: 12px; padding: 20px; min-height: 500px; }
.student-detail-header { border-bottom: 2px solid var(--border-light); padding-bottom: 15px; margin-bottom: 20px; }
.tabs { display: flex; gap: 10px; margin-top: 15px; }
.tab-btn { padding: 8px 16px; background: var(--bg-light); border: 1px solid var(--border); border-radius: 8px; cursor: pointer; font-weight: 600; color: var(--text-muted); font-size: 14px; }
.tab-btn:hover { background: var(--bg-hover); }
.tab-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-top: 15px; }
.info-grid code { background: #edf2f7; padding: 2px 6px; border-radius: 4px; font-family: monospace; }
@media (max-width: 768px) {
    .students-layout { grid-template-columns: 1fr; }
    .students-sidebar { height: 200px; }
    .info-grid { grid-template-columns: 1fr; }
}

/* Фикс для Highlight.js */
.theory-block pre code.hljs { background: transparent; padding: 0; }
.theory-block pre { background: #282c34; }
.theory-block ul { list-style-type: disc !important; margin: 10px 0 10px 20px !important; padding-left: 20px !important; }
.theory-block ol { list-style-type: decimal !important; margin: 10px 0 10px 20px !important; padding-left: 20px !important; }
.theory-block li { margin-bottom: 5px !important; display: list-item !important; }
.hljs-comment, .hljs-quote { color: #a3be8c !important; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #c678dd !important; }
.hljs-string, .hljs-doctag { color: #98c379 !important; }
.hljs-title, .hljs-section, .hljs-selector-id { color: #61afef !important; }
.hljs-number, .hljs-literal { color: #d19a66 !important; }
.theory-block pre code { white-space: pre-wrap !important; word-break: break-word !important; overflow-wrap: break-word !important; }
.theory-block pre { overflow-x: hidden !important; }

/* Фикс слоев модалок */
#variantEditorModal { z-index: 2100 !important; }
#variantTaskModal { z-index: 2200 !important; }
#variantLibraryModal { z-index: 2050 !important; }

@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }

#chatMessages {
    height: 400px !important;
    overflow-y: auto !important;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}
#stChatMessages {
    height: 100% !important;
    overflow-y: auto !important;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 15px;
    background: #f8f9fa;
}

/* ============ МОБИЛЬНАЯ АДАПТАЦИЯ: STUDENTS ============ */
.students-mobile-btn { display: none; padding: 8px 14px; background: var(--primary); color: white; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; }
.students-sidebar-close { display: none; background: none; border: none; font-size: 22px; cursor: pointer; color: #999; margin-left: auto; }
@media (max-width: 768px) {
    .students-layout { grid-template-columns: 1fr; }
    .students-sidebar { position: fixed; top: 0; left: -100%; width: 85%; max-width: 320px; height: 100vh; background: #fff; z-index: 3000; box-shadow: 2px 0 12px rgba(0,0,0,0.25); transition: left 0.25s ease; border-radius: 0; padding: 20px 15px; overflow-y: auto; }
    .students-sidebar.open { left: 0; }
    .students-sidebar-close { display: block; }
    .students-mobile-btn { display: inline-block; }
    .student-detail-area { padding: 12px; }
    .info-grid { grid-template-columns: 1fr; }
}

/* ============ КНОПКА «ЗАПИСАТЬСЯ» НА МОБИЛКЕ ============ */
@media (max-width: 500px) { .book-slot-btn-text { display: none; } }

/* ============ DROPDOWN НАСТРОЕК ============ */
.settings-dropdown { position: relative; display: inline-block; }
.settings-dropdown-btn { padding: 6px 14px; background: var(--primary); color: white; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 4px; transition: background 0.2s; }
.settings-dropdown-btn:hover { background: var(--primary-hover); }
.settings-dropdown-menu { display: none; position: absolute; right: 0; top: calc(100% + 6px); min-width: 220px; background: white; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.18); z-index: 5000; overflow: hidden; border: 1px solid var(--border-light); }
.settings-dropdown-menu.open { display: block; }
.settings-dropdown-menu button, .settings-dropdown-menu a { display: block; width: 100%; text-align: left; padding: 11px 16px; background: none; border: none; cursor: pointer; font-size: 14px; color: var(--text); text-decoration: none; font-family: inherit; transition: background 0.15s; }
.settings-dropdown-menu button:hover, .settings-dropdown-menu a:hover { background: var(--bg-hover); transform: none; }
.settings-dropdown-menu .dropdown-divider { height: 1px; background: var(--border-light); margin: 4px 0; }
@media (max-width: 768px) {
    .settings-dropdown-menu { position: fixed; right: 8px; left: 8px; top: auto; bottom: 8px; min-width: auto; border-radius: 14px; }
}

/* =====================================================================
   СИСТЕМА КЛАССОВ (для замены инлайн-стилей) + ТЁМНАЯ ТЕМА
   ===================================================================== */

/* ---------- Утилитарные классы ---------- */
.text-muted   { color: var(--text-muted); }
.text-light   { color: var(--text-light); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger  { color: var(--danger); }

.bg-soft          { background: var(--bg-light); }
.bg-card          { background: var(--bg-white); }
.bg-hover         { background: var(--bg-hover); }
.bg-success-soft  { background: #f0fff4; border-radius: var(--radius-md); border: 1px solid #c6f6d5; }
.bg-danger-soft   { background: #fff5f5; border-radius: var(--radius-md); }
.bg-warning-soft  { background: #fffbea; border-radius: var(--radius-md); }
.bg-primary-soft  { background: #f0f4ff; border-radius: var(--radius-md); }

.block-soft {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-light);
}
.block-border {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-light);
    border: 1px solid var(--border-light);
}
.block-white {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-white);
    border: 1px solid var(--border-light);
}
.block-transparent {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: transparent;
}

.flex-row      { display: flex; gap: 10px; align-items: center; }
.flex-row-wrap { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.flex-col      { display: flex; flex-direction: column; gap: 8px; }

.push-status-row {
    margin-top: 15px;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.push-status-card {
    padding: 10px 14px;
    background: #f0fff4;
    border-radius: 8px;
    border: 1px solid #c6f6d5;
    color: #22543d;
    font-size: 14px;
}
.balance-card {
    margin: 15px 0;
    padding: 12px 14px;
    background: var(--bg-light);
    border-radius: 8px;
    font-size: 14px;
}
.balance-sub { color: var(--text-muted); font-size: 0.9em; }

/* ---------- Тёмная тема ---------- */
[data-theme="dark"] {
    color-scheme: dark;

    --primary: #7c8ff0;
    --primary-hover: #6a7ce0;
    --primary-dark: #5a4a8a;
    --success: #48bb78;
    --success-hover: #38a169;
    --warning: #ed8936;
    --danger: #fc8181;
    --danger-hover: #f56565;
    --gray: #4a5568;
    --gray-hover: #2d3748;

    --text: #e2e8f0;
    --text-muted: #a0aec0;
    --text-light: #718096;

    --bg-light: #2b2823;
    --bg-hover: #4a4238;
    --bg-white: #26221c;

    --border: #4a5568;
    --border-light: #2d3748;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 2px 10px rgba(0,0,0,0.4);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #1c1913 0%, #26221c 100%);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: #2d3748;
    color: var(--text);
    border-color: var(--border);
}
[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder { color: var(--text-light); }
[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus { border-color: var(--primary); }
[data-theme="dark"] option { background: #2d3748; color: var(--text); }

[data-theme="dark"] .modal-content { background: #1f2937; border: 1px solid #374151; color: var(--text); }
[data-theme="dark"] .modal-header { border-bottom-color: #374151; }
[data-theme="dark"] .modal-body label { color: var(--text-muted); }
[data-theme="dark"] .modal-body code { background: #374151; color: #e2e8f0; padding: 2px 6px; border-radius: 4px; }

[data-theme="dark"] .login-box,
[data-theme="dark"] .section-card,
[data-theme="dark"] .course-card,
[data-theme="dark"] .student-card,
[data-theme="dark"] .report-card,
[data-theme="dark"] .slice-card,
[data-theme="dark"] .chapter-block,
[data-theme="dark"] .page-item,
[data-theme="dark"] .block-item,
[data-theme="dark"] .test-question,
[data-theme="dark"] .answer-option,
[data-theme="dark"] .variant-task-item,
[data-theme="dark"] .variant-library-item,
[data-theme="dark"] .settings-dropdown-menu,
[data-theme="dark"] .day-header,
[data-theme="dark"] .finance-item,
[data-theme="dark"] .info-grid code,
[data-theme="dark"] .block-soft,
[data-theme="dark"] .block-border,
[data-theme="dark"] .balance-card {
    background: var(--bg-white);
    color: var(--text);
    border-color: var(--border-light);
}

[data-theme="dark"] .settings-dropdown-menu button:hover,
[data-theme="dark"] .settings-dropdown-menu a:hover { background: var(--bg-hover); }

[data-theme="dark"] .student-subject,
[data-theme="dark"] .course-badge,
[data-theme="dark"] .track-badge { background: #4a5568; color: #e2e8f0; }
[data-theme="dark"] .course-badge.empty { background: #2d3748; color: var(--text-light); }

[data-theme="dark"] .tasks-table { background: var(--bg-white); }
[data-theme="dark"] .tasks-table th { background: var(--primary); color: #fff; }
[data-theme="dark"] .tasks-table td { border-bottom-color: var(--border); color: var(--text); }
[data-theme="dark"] .tasks-table tr:hover { background: var(--bg-hover); }

[data-theme="dark"] .day-column { background: #2d3748; }
[data-theme="dark"] .day-column.today { background: #3a4a68; box-shadow: 0 0 0 3px var(--primary); }
[data-theme="dark"] .day-date { color: var(--text-muted); }
[data-theme="dark"] .day-total { background: #1a3a2a; border-color: var(--success); color: var(--success); }

[data-theme="dark"] .finance-panel {
    background: linear-gradient(135deg, #1a3a2a 0%, #1a2a3a 100%);
    border-color: var(--success);
}

[data-theme="dark"] .theory-block pre,
[data-theme="dark"] pre.ql-syntax { background: #0d1117; color: #d4d4d4; }

[data-theme="dark"] .ql-toolbar,
[data-theme="dark"] .ql-container {
    background: #2d3748;
    color: var(--text);
    border-color: var(--border);
}
[data-theme="dark"] .ql-editor { color: var(--text); }
[data-theme="dark"] .ql-editor.ql-blank::before { color: var(--text-light); }
[data-theme="dark"] .ql-stroke { stroke: var(--text); }
[data-theme="dark"] .ql-fill { fill: var(--text); }
[data-theme="dark"] .ql-picker { color: var(--text); }
[data-theme="dark"] .ql-picker-options { background: #2d3748; border-color: var(--border); }

[data-theme="dark"] .course-sidebar,
[data-theme="dark"] .students-sidebar { background: #1a202c; border-color: var(--border); }
[data-theme="dark"] .sidebar-page { color: var(--text); }
[data-theme="dark"] .sidebar-page:hover { background: var(--bg-hover); }
[data-theme="dark"] .sidebar-page.active { background: var(--primary); color: #fff; }
[data-theme="dark"] .sidebar-student-item { color: var(--text); }
[data-theme="dark"] .sidebar-student-item:hover { background: var(--bg-hover); }
[data-theme="dark"] .sidebar-student-item.active { background: var(--primary); color: #fff; }

[data-theme="dark"] #chatMessages,
[data-theme="dark"] #stChatMessages,
[data-theme="dark"] #chatListContainer { background: #1a202c; }
[data-theme="dark"] #emojiPicker,
[data-theme="dark"] #stEmojiPicker { background: #2d3748; border-color: var(--border); }

[data-theme="dark"] .tab-btn { background: #2d3748; color: var(--text-muted); border-color: var(--border); }
[data-theme="dark"] .tab-btn:hover { background: var(--bg-hover); }
[data-theme="dark"] .tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

[data-theme="dark"] .general-message,
[data-theme="dark"] .empty-text { color: var(--text-muted); }

[data-theme="dark"] .theory-block,
[data-theme="dark"] .question-text { color: var(--text); }

[data-theme="dark"] .practice-hint {
    background: #3a2f1a;
    color: #fbd38d;
    border-left-color: var(--warning);
}

[data-theme="dark"] .variant-files,
[data-theme="dark"] .theory-block a,
[data-theme="dark"] .question-text a { color: var(--primary); }

[data-theme="dark"] .push-status-card {
    background: #1a3a2a;
    border-color: #2f855a;
    color: #9ae6b4;
}
[data-theme="dark"] .balance-card {
    background: #2d3748;
    color: var(--text);
}
[data-theme="dark"] .balance-sub { color: var(--text-muted); }
[data-theme="dark"] #detailBalance { color: #68d391 !important; }

[data-theme="dark"] .nav-link { background: var(--bg-white); color: var(--primary); border-color: var(--border); }
[data-theme="dark"] .nav-link:hover { background: var(--bg-hover); }
[data-theme="dark"] .logout-btn { background: var(--bg-white); color: var(--text-muted); border-color: var(--border); }
[data-theme="dark"] .logout-btn:hover { background: #3a1a1a; color: #fc8181; border-color: #fc8181; }

[data-theme="dark"] .btn-sm.red { background: var(--bg-white); color: #fc8181; border-color: var(--border); }
[data-theme="dark"] .btn-sm.red:hover { background: #3a1a1a; }
[data-theme="dark"] .btn-sm.gray { background: #2d3748; color: #a0aec0; border-color: var(--border); }
[data-theme="dark"] .btn-sm { background: var(--bg-white); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .btn-sm:hover { background: var(--bg-hover); }

[data-theme="dark"] .bg-success-soft { background: #1a3a2a; border-color: #2f855a; }
[data-theme="dark"] .bg-danger-soft { background: #3a1a1a; }
[data-theme="dark"] .bg-warning-soft { background: #3a2f1a; }
[data-theme="dark"] .bg-primary-soft { background: #1a2a5a; }

/* Кнопка переключения темы (если где-то появится) */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--bg-light);
    color: var(--text);
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s;
}
.theme-toggle:hover { background: var(--bg-hover); transform: scale(1.05); }

/* ============ ЕДИНЫЙ СТИЛЬ КНОПОК (унификация) ============ */
/* Цветные классы сохранены для совместимости, но визуально
   нейтральны: цветной становится только рамка при наведении. */
[data-theme="dark"] .btn-sm.green { background: var(--bg-white); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .btn-sm.green:hover { background: var(--bg-hover); border-color: var(--success); }
[data-theme="dark"] .btn-sm.blue { background: var(--bg-white); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .btn-sm.blue:hover { background: var(--bg-hover); border-color: var(--primary); }

/* Кнопки настроек/чатов — идентичны nav-link */
.save-btn {
    background: var(--bg-white);
    color: var(--text);
    border: 2px solid var(--border);
}
.save-btn:hover { background: var(--bg-hover); border-color: var(--success); }
.settings-dropdown-btn {
    padding: 8px 16px;
    background: var(--bg-white);
    color: var(--primary);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
}
.settings-dropdown-btn:hover { background: var(--bg-hover); border-color: var(--primary); }

/* Тёмная тема для обновлённых кнопок */
[data-theme="dark"] .save-btn { background: var(--bg-white); border-color: var(--border); }
[data-theme="dark"] .save-btn:hover { background: var(--bg-hover); border-color: var(--success); }
[data-theme="dark"] .settings-dropdown-btn { background: var(--bg-white); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .settings-dropdown-btn:hover { background: var(--bg-hover); }
[data-theme="dark"] .week-navigation button { background: var(--bg-white); color: var(--text); border-color: var(--border); }
[data-theme="dark"] .week-navigation button:hover { background: var(--bg-hover); border-color: var(--primary); }

/* ============ СОБЫТИЯ РАСПИСАНИЯ — единый стиль ============ */
/* Статус кодируется рамкой + полупрозрачной заливкой:
   выполнено — зелёная, не выполнено — красная. */
.event {
    background: var(--bg-white) !important;
    border: 2px solid var(--border);
    color: var(--text) !important;
    box-shadow: var(--shadow-sm);
    padding: 10px 12px;
}
.event.done {
    background: rgba(72, 187, 120, 0.12) !important;
    border-color: var(--success);
}
.event:not(.done) {
    background: rgba(252, 129, 129, 0.12) !important;
    border-color: var(--danger-hover);
}
.event:hover {
    transform: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.event .price-badge {
    background: rgba(0,0,0,0.55);
}
.event .event-time { font-weight: 700; }
/* Тёмная тема событий */
[data-theme="dark"] .event { background: #2d3748 !important; color: var(--text) !important; }
[data-theme="dark"] .event.done { background: rgba(72, 187, 120, 0.15) !important; }
[data-theme="dark"] .event:not(.done) { background: rgba(252, 129, 129, 0.15) !important; }

/* Исправление: рамка «сегодня» обрезалась overflow-ом расписания */
.schedule { padding: 4px 4px 15px; }
/* Заголовок дня не должен переноситься и обрезаться */
.day-header { padding: 8px 6px; font-size: 0.95em; white-space: nowrap; }
/* Нерабочий день (по настройке рабочих дней) */
.day-column.non-work { opacity: 0.55; }
.non-work-day {
    text-align: center;
    padding: 14px 6px;
    color: var(--text-light);
    font-size: 12px;
    font-style: italic;
}