*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
    display: flex;
    flex-direction: column;
    background: var(--c-bg);
    color: var(--c-text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    line-height: 1.5;
}

:root {
    --c-bg: #f8fafc;
    --c-surface: #ffffff;
    --c-text: #0f172a;
    --c-text-muted: #64748b;
    --c-text-link: #6366f1;
    --c-text-link-hover: #4f46e5;
    --c-border: #e2e8f0;
    --c-accent: #6366f1;
    --c-badge-ok-bg: #dcfce7;
    --c-badge-ok-text: #166534;
    --c-badge-warn-bg: #fef3c7;
    --c-badge-warn-text: #92400e;
}

[data-theme="dark"] {
    --c-bg: #0f1115;
    --c-surface: #171a21;
    --c-text: #e7e9ee;
    --c-text-muted: #9aa3b2;
    --c-text-link: #6ea8fe;
    --c-text-link-hover: #8bb9fe;
    --c-border: #262b36;
    --c-accent: #6ea8fe;
    --c-badge-ok-bg: rgba(16, 185, 129, 0.15);
    --c-badge-ok-text: #6ee7b7;
    --c-badge-warn-bg: rgba(251, 191, 36, 0.15);
    --c-badge-warn-text: #fcd34d;
}

a { color: var(--c-text-link); text-decoration: none; }
a:not(.btn):hover { color: var(--c-text-link-hover); }

/* Атрибут hidden должен скрывать элемент даже если у него display из класса */
[hidden] { display: none !important; }

/* Layout */
.page { display: flex; flex-direction: column; min-height: 100vh; }
.page-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--c-border); background: var(--c-surface); }
.page-header-inner { max-width: 1152px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 0.5rem 1rem; flex-wrap: wrap; padding: 0.75rem 1.5rem; }
@media (max-width: 640px) {
    .page-header-inner { padding: 0.5rem 0.75rem; }
    .nav { width: 100%; gap: 0.5rem 0.75rem; flex-wrap: wrap; font-size: 0.8125rem; }
    .nav .btn { padding: 0.25rem 0.6rem; font-size: 0.75rem; }
    .nav-user { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
}
.page-main { flex: 1; width: 100%; max-width: 1152px; margin: 0 auto; padding: 2rem 1.5rem; }
.page-footer { border-top: 1px solid var(--c-border); padding: 1rem; text-align: center; font-size: 0.75rem; color: var(--c-text-muted); }

/* Nav */
.nav { display: flex; align-items: center; gap: 1rem; font-size: 0.875rem; }
.nav-link { color: var(--c-text-link); text-decoration: none; }
.nav-link:hover { color: var(--c-text-link-hover); }
.nav-sep { color: var(--c-text-muted); }
.logo { font-size: 1.125rem; font-weight: 600; color: var(--c-text); text-decoration: none; }
.nav-user { font-weight: 500; }
.theme-btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.3rem 0.5rem; }
.theme-icon { width: 1.05rem; height: 1.05rem; display: block; }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem; }
.breadcrumb .nav-sep { user-select: none; }
.check-list { display: flex; flex-direction: column; gap: 0.25rem; margin-top: 0.25rem; max-height: 12rem; overflow-y: auto; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    border-radius: 0.5rem; padding: 0.5rem 1rem; font-size: 0.875rem; font-weight: 500;
    border: none; cursor: pointer; transition: opacity 0.15s;
}
.btn:active { opacity: 0.8; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; }
.btn-primary { background: var(--c-accent); color: white; text-decoration: none; }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary {
    background: var(--c-surface); color: var(--c-text); text-decoration: none;
    box-shadow: inset 0 0 0 1px var(--c-border);
}
.btn-secondary:hover { background: var(--c-border); }

/* Forms */
.input {
    width: 100%; border-radius: 0.5rem; background: var(--c-bg); color: var(--c-text);
    padding: 0.5rem 0.75rem; font-size: 0.875rem; border: 1px solid var(--c-border);
    outline: none;
}
.input:focus { border-color: var(--c-accent); box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2); }
.input::placeholder { color: var(--c-text-muted); }
.label { display: block; margin-bottom: 0.25rem; font-size: 0.875rem; font-weight: 500; }
.hint { margin-top: 0.25rem; font-size: 0.75rem; color: var(--c-text-muted); }

/* Cards */
.card { border-radius: 0.75rem; background: var(--c-surface); border: 1px solid var(--c-border); }
.card-flush { border-radius: 0.75rem; background: var(--c-surface); border: 1px solid var(--c-border); padding: 0; overflow: hidden; }
.card-body { padding: 1.5rem; }

/* Grid */
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(22rem, 1fr)); }
.grid-stats { grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr)); }

/* Typography */
.page-title { margin: 0 0 1.5rem; font-size: 1.5rem; font-weight: 600; }
.section-title { margin: 0 0 0.75rem; font-size: 1.125rem; font-weight: 500; }
.stat-value { margin: 0.5rem 0 0; font-size: 1.875rem; font-weight: 600; }
.stat-title { font-size: 0.875rem; color: var(--c-text-muted); margin: 0; }
.text-muted { color: var(--c-text-muted); }
.opacity-30 { opacity: 0.3; }
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.font-mono { font-family: monospace; }

/* Spacing */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.ml-2 { margin-left: 0.5rem; }
.p-0 { padding: 0; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Flex */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }
.overflow-x-auto { overflow-x: auto; }

/* Badges */
.badge { display: inline-flex; align-items: center; border-radius: 9999px; padding: 0.125rem 0.625rem; font-size: 0.75rem; font-weight: 500; }
.badge-ok { background: var(--c-badge-ok-bg); color: var(--c-badge-ok-text); }
.badge-warn { background: var(--c-badge-warn-bg); color: var(--c-badge-warn-text); }
.badge-btn { border: none; cursor: pointer; padding: 0.125rem 0.625rem; }

/* Tables */
table { width: 100%; font-size: 0.875rem; border-collapse: collapse; }
/* Прокручивается только таблица (обёртка ставится скриптом table-scroll.js), не карточка */
.table-scroll-box { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
th { text-align: left; font-weight: 500; color: var(--c-text-muted); padding: 0.75rem 1.5rem; border-bottom: 1px solid var(--c-border); }
td { padding: 0.75rem 1.5rem; border-bottom: 1px solid var(--c-border); }
tr:last-child td { border-bottom: none; }

/* Alerts */
.alert { padding: 0.75rem 1rem; border-radius: 0.5rem; font-size: 0.875rem; margin-bottom: 1rem; }
.alert-error { background: #fef2f2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-warning { background: #fef3c7; color: #92400e; }

.ml-2 { margin-left: 0.5rem; }
.list-pad { padding-left: 1.25rem; }
.import-card { border-color: rgba(16,185,129,0.4); }
.mini-alert { padding: 0.5rem 0.75rem; border-radius: 0.25rem; margin-bottom: 0.5rem; }
.font-semibold { font-weight: 600; }

/* Theme toggle */
.theme-btn { padding: 0.25rem 0.5rem; font-size: 0.75rem; }

/* Group assignment page */
.group-title { margin: 0 0 0.5rem; font-size: 1rem; font-weight: 600; }
.inline-form { display: inline-flex; align-items: center; gap: 0.375rem; margin: 0; }
.inline-form .input-sm { width: auto; min-width: 10rem; }
.input-sm { padding: 0.25rem 0.5rem; font-size: 0.8125rem; }
.input-score { width: 4.5rem; }
.inline-form .input-sm { width: auto; min-width: 0; }
.inline-form .input-score, input[type="number"].input-score { width: 4.5rem; min-width: 4.5rem; flex: 0 0 auto; }
.filter-select { width: auto; }
.hidden { display: none !important; }

/* На узком экране формы-строки растягиваются и переносят элементы:
   нативный select иначе тянется по самому длинному пункту и вылезает за экран */
@media (max-width: 640px) {
    .inline-form { display: flex; flex-wrap: wrap; width: 100%; }
    .inline-form .input, .inline-form select { width: 100%; min-width: 0; }
    .inline-form .btn { flex: 0 0 auto; }
    .actions-cell .inline-form { display: inline-block; width: auto; }
    .actions-cell .inline-form .input, .actions-cell .inline-form select { width: auto; }
}

/* Toast-уведомление */
.toast { position: fixed; top: 1rem; right: 1rem; z-index: 50; width: 20rem; }

/* Всплывающие уведомления (flash notice/error) вместо статичных алертов */
.toast-host {
    position: fixed; top: 1rem; right: 1rem; z-index: 100;
    display: flex; flex-direction: column; gap: 0.5rem;
    width: min(24rem, calc(100vw - 2rem)); pointer-events: none;
}
.toast-item {
    pointer-events: auto; display: flex; align-items: flex-start; gap: 0.5rem;
    padding: 0.7rem 0.85rem; border-radius: 0.5rem; border: 1px solid var(--c-border);
    border-left-width: 4px; background: var(--c-surface); color: var(--c-text);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    animation: toast-in 0.18s ease-out;
}
.toast-item .toast-text { flex: 1 1 auto; min-width: 0; white-space: pre-line; overflow-wrap: anywhere; }
.toast-item.toast-success { border-left-color: #16a34a; }
.toast-item.toast-error { border-left-color: #dc2626; }
.toast-item.toast-warning { border-left-color: #d97706; }
.toast-close {
    flex: 0 0 auto; border: none; background: none; cursor: pointer;
    color: var(--c-text-muted); font-size: 1.05rem; line-height: 1; padding: 0 0.1rem;
}
.toast-close:hover { color: var(--c-text); }
@keyframes toast-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: none; }
}

/* Modals */
dialog.modal {
    border: none; border-radius: 0.75rem; padding: 0;
    background: var(--c-surface); color: var(--c-text);
    width: min(34rem, calc(100vw - 2rem));
    box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
dialog.modal::backdrop { background: rgba(0,0,0,0.55); }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.5rem; border-bottom: 1px solid var(--c-border); }
.modal-title { margin: 0; font-size: 1.0625rem; font-weight: 600; }
.modal-close { border: none; background: none; cursor: pointer; font-size: 1.25rem; color: var(--c-text-muted); padding: 0 0.25rem; }
.modal-close:hover { color: var(--c-text); }
.modal-body { padding: 1.5rem; max-height: 70vh; overflow-y: auto; }

/* Двухуровневые формы уровней лабы */
.level-row { display: flex; gap: 0.5rem; align-items: center; margin-bottom: 0.5rem; }
.level-row .input { flex: 1; }

/* Markdown body */
.md-body { font-size: 0.9375rem; }
.md-body h1, .md-body h2, .md-body h3 { margin: 1rem 0 0.5rem; line-height: 1.3; }
.md-body h1 { font-size: 1.25rem; }
.md-body h2 { font-size: 1.125rem; }
.md-body p, .md-body ul, .md-body ol { margin: 0.5rem 0; }
.md-body ul, .md-body ol { padding-left: 1.5rem; }
.md-body pre { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 0.5rem; padding: 0.75rem 1rem; overflow-x: auto; font-size: 0.8125rem; }
.md-body code { font-family: monospace; }
.md-body details.spoiler { border: 1px solid var(--c-border); border-radius: 0.5rem; padding: 0.5rem 0.75rem; margin: 0.5rem 0; }
.md-body details.spoiler summary { cursor: pointer; font-weight: 500; color: var(--c-text-link); }
.md-body img { max-width: 100%; }
.md-body table { margin: 0; }
/* Таблицы в статьях прокручиваются по горизонтали, как блоки кода */
.table-scroll { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0.5rem 0; }
/* Блок кода: кнопка копирования в правом верхнем углу */
.md-code-wrap { position: relative; margin: 0.5rem 0; }
.md-code-wrap pre { margin: 0; }
.md-copy {
    position: absolute; top: 0.4rem; right: 0.4rem;
    font: inherit; font-size: 0.72rem; line-height: 1;
    padding: 0.25rem 0.5rem; cursor: pointer;
    color: var(--c-text-muted); background: var(--c-surface);
    border: 1px solid var(--c-border); border-radius: 0.35rem; opacity: 0.85;
}
.md-copy:hover { color: var(--c-text); opacity: 1; }
.md-copy.copied { color: var(--c-text-link); }

/* Empty state */
.empty { text-align: center; color: var(--c-text-muted); padding: 1.5rem; }

/* Mono inline code */
code.code { padding: 0.125rem 0.5rem; border-radius: 0.25rem; font-family: monospace; background: var(--c-bg); }

/* Containers */
.container-sm { max-width: 28rem; margin: 0 auto; }
.form-stack { display: flex; flex-direction: column; gap: 1rem; }
.form-card { padding: 1.5rem; }

/* Header logo */
.link-inherit { font-size: 0.875rem; }/* Chips (оценочные комментарии) */
.chip { display: inline-block; margin: 2px 4px 2px 0; padding: 2px 8px; border-radius: 9999px; font-size: 11.5px; line-height: 1.5; }
.chip-pos { background: #16803c; color: #fff; }
.chip-neu { background: #5d6570; color: #fff; }
.chip-neg { background: #b3283b; color: #fff; }
/* Слоты комментариев в диалоге */
.cs-row { display: flex; gap: 6px; align-items: center; position: relative; }
.cs-row .cs-text { flex: 1 1 auto; min-width: 0; }
.ac-list {
    position: absolute; left: 0; top: 100%; margin-top: 2px; z-index: 20;
    min-width: 100%; max-height: 14rem; overflow-y: auto;
    background: var(--c-surface); border: 1px solid var(--c-border);
    border-radius: 0.4rem; box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}
.ac-item { padding: 0.4rem 0.6rem; cursor: pointer; font-size: 0.875rem; }
.ac-item:hover, .ac-item.active { background: var(--c-bg); }
.ac-empty { padding: 0.4rem 0.6rem; font-size: 0.875rem; color: var(--c-text-muted); }
/* Ячейка матрицы: вариант и кнопки действий под ним; кнопки в шапке ЛР */
.cell-stack { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; }
.variant-btn {
    display: inline-block; padding: 0.18rem 0.5rem; border-radius: 0.4rem;
    border: 1px solid var(--c-border); background: var(--c-bg);
    font-size: 0.8rem; white-space: nowrap;
}
.variant-btn.manual { border-color: var(--c-border-strong, var(--c-border)); font-weight: 600; }
.cell-btns { display: flex; gap: 0.2rem; }
.cell-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.15rem;
    min-width: 1.6rem; height: 1.6rem; padding: 0 0.35rem; cursor: pointer;
    border: 1px solid var(--c-border); border-radius: 0.35rem;
    background: var(--c-surface); color: var(--c-text); text-decoration: none; font-size: 0.85rem;
}
.cell-btn:hover { background: var(--c-bg); }
.cell-btn.dim { color: var(--c-text-muted); }
.cell-btn.warn { color: #d97706; }
.cell-btn.ok { color: #16a34a; }
.cell-num { font-size: 0.72rem; opacity: 0.75; }
.mini-count { font-size: 0.72rem; margin-left: 0.15rem; color: var(--c-text-muted); }
.defense-cell-timer { font-variant-numeric: tabular-nums; }
.lab-head-actions { display: flex; gap: 0.2rem; }
.mini-btn {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 1.5rem; height: 1.5rem; padding: 0 0.3rem; cursor: pointer;
    border: 1px solid var(--c-border); border-radius: 0.35rem;
    background: var(--c-surface); color: var(--c-text); text-decoration: none; font-size: 0.85rem;
}
.mini-btn:hover { background: var(--c-bg); }
.mini-btn.ok { color: #16a34a; }
.mini-btn.warn { color: #d97706; }

/* Увеличенный диалог (оценка + комментарии) */
dialog.modal.modal-lg { width: min(72rem, calc(100vw - 2rem)); }
dialog.modal.modal-lg .modal-body { max-height: 88vh; min-height: 62vh; }
.mini-btn svg, .cell-btn svg { width: 1rem; height: 1rem; }

.chip { display: inline-block; margin: 2px 4px 2px 0; padding: 2px 8px; border-radius: 9999px; font-size: 11.5px; line-height: 1.5; }
.chip-pos { background: #16803c; color: #fff; }
.chip-neu { background: #5d6570; color: #fff; }
.chip-neg { background: #b3283b; color: #fff; }

/* Defense timer */
/* Материалы: ряды и ручки перетаскивания слева, одним столбцом */
.sort-row { display: flex; align-items: center; gap: 0.5rem; min-width: 0; }
.sort-title { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sort-actions { margin-left: auto; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.sort-list { list-style: none; margin: 0; padding: 0; }
.sort-list > li { display: flex; align-items: center; gap: 0.5rem; min-width: 0; padding: 0.15rem 0; }
.chapter-card { padding: 0.75rem 1rem; }
.sub-acc { margin-top: 0.25rem; border-top: 1px solid var(--c-border); }
[data-section-list] > .sub-acc:first-of-type { border-top: none; }
.sub-acc > .sub-head { padding: 0.4rem 0; }
.sub-acc.collapsed > .section-body { display: none; }
.sub-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    flex: 0 0 auto; width: 1rem; height: 1rem; padding: 0; border: none;
    background: none; cursor: pointer; color: var(--c-text-muted);
}
.sub-toggle:hover { color: var(--c-text); }
.sub-arrow {
    flex: 0 0 auto; width: 8px; height: 8px;
    border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
    transform: rotate(-135deg); transition: transform 0.2s;
}
.sub-acc.collapsed .sub-arrow { transform: rotate(45deg); }
.section-body { padding-bottom: 0.4rem; }

/* ---- Матрица группы и карточки защиты ---- */
.m-0 { margin: 0; }
.mb-8 { margin-bottom: 2rem; }
.mb-0 { margin-bottom: 0; }
.text-strong { font-weight: 600; color: var(--c-text); }
.text-right { text-align: right; }
.font-medium { font-weight: 500; }
.scroll-x { overflow-x: auto; }
.matrix { border-collapse: separate; border-spacing: 0; }
.matrix th { vertical-align: top; }
.matrix td { vertical-align: middle; }
.matrix th.lab-col { min-width: 9.5rem; border-left: 1px solid var(--c-border); }
.matrix td.cell-lab { min-width: 9.5rem; border-left: 1px solid var(--c-border); }
.matrix td.student-cell { min-width: 12rem; }
.lab-col-head { display: flex; flex-direction: column; align-items: center; gap: 0.375rem; }
.cell-line { display: flex; align-items: center; gap: 0.375rem; font-size: 0.8125rem; text-align: left; }
.cell-label { color: var(--c-text-muted); min-width: 3.5rem; }
.cell-link { font-size: 0.8125rem; }
.cell-edit { padding: 0 0.4rem; }
.cell-grade-line { font-weight: 500; }
.defense-cell-actions { display: flex; gap: 0.35rem; justify-content: flex-end; flex-wrap: wrap; }
.th-w-sm { width: 4rem; }
.th-w-md { width: 12rem; }
.span-2 { grid-column: 1 / -1; }
.preview { max-width: 34rem; }
.md-preview { max-width: 22rem; }

/* ---- Комментарии к оценке (ЛК студента) ---- */
.review-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1rem; }
.review-col h3 { margin-bottom: 0.35rem; }
.review-list { margin: 0; padding-left: 1.15rem; }
.review-list li { margin: 0.15rem 0; }
.tone-positive-text { color: #166534; }
.tone-negative-text { color: #991b1b; }
[data-theme="dark"] .tone-positive-text { color: #6ee7b7; }
[data-theme="dark"] .tone-negative-text { color: #fca5a5; }
.tone-label { display: flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; }
.pre-wrap { white-space: pre-wrap; word-break: break-word; }

/* Редактируемая матрица: закреплённый столбец и компактные селекты */
.matrix-sticky { position: sticky; left: 0; z-index: 2; background: var(--c-surface); }
.matrix thead .matrix-sticky { z-index: 3; }
.level-form { margin: 0; }
.level-select {
    width: auto; min-width: 6rem; max-width: 9.5rem;
    padding: 0.15rem 1.5rem 0.15rem 0.4rem; font-size: 0.75rem;
}
.cell-level { justify-content: center; }
.pin-hint { font-size: 0.75rem; }

/* Компактные ячейки матрицы группы */
.btn-xs { padding: 0.05rem 0.4rem; font-size: 0.7rem; line-height: 1.5; }
.badge-xs { font-size: 0.65rem; padding: 0.05rem 0.4rem; }
.chip-xs { font-size: 0.65rem; padding: 0.05rem 0.4rem; }
.cell-top { display: flex; align-items: center; justify-content: center; gap: 0.25rem; }
.cell-chips { display: flex; flex-wrap: wrap; gap: 0.18rem; justify-content: center; margin-top: 0.25rem; }
.cell-chip {
    display: inline-flex; align-items: center; gap: 0.15rem;
    font-size: 0.72rem; line-height: 1.7; padding: 0.05rem 0.45rem;
    border: 1px solid var(--c-border); border-radius: 99px;
    background: var(--c-bg); color: var(--c-text); white-space: nowrap; cursor: pointer;
    text-decoration: none; font-family: inherit;
}
.cell-chip:hover { border-color: var(--c-border-strong, var(--c-border)); filter: brightness(0.97); }
.chip-dim { color: var(--c-text-muted); }
.chip-warn { color: #92400e; background: #fef3c7; border-color: #fde68a; }
.chip-ok { color: #166534; background: #dcfce7; border-color: #bbf7d0; }
.chip-link:hover { color: var(--c-text-link); }
[data-theme="dark"] .chip-warn { color: #fcd34d; background: rgba(146, 64, 14, 0.25); border-color: rgba(146, 64, 14, 0.5); }
[data-theme="dark"] .chip-ok { color: #86efac; background: rgba(22, 101, 52, 0.25); border-color: rgba(22, 101, 52, 0.5); }
.lab-head-row { display: flex; align-items: center; justify-content: center; gap: 0.3rem; }
.actions-cell { white-space: nowrap; }
.actions-cell .inline-form { display: inline-block; }

/* tablekit: сортируемые таблицы и поиск */
th.th-sortable { cursor: pointer; user-select: none; }
th.th-sortable:hover { background: var(--c-surface); }
th.th-sortable.is-asc::after { content: " ▲"; color: var(--c-text-muted); font-size: 0.7rem; }
th.th-sortable.is-desc::after { content: " ▼"; color: var(--c-text-muted); font-size: 0.7rem; }
.row-hidden { display: none !important; }
.table-search { width: 14rem; }
@media (max-width: 640px) { .table-search { width: 100%; } }
.filter-row th { padding: 0.25rem 0.35rem; background: var(--c-bg); }
.filter-control {
    width: 100%; min-width: 3.5rem; font-size: 0.72rem; line-height: 1.4;
    padding: 0.1rem 0.25rem; border: 1px solid var(--c-border); border-radius: 0.35rem;
    background: var(--c-surface); color: var(--c-text); font-family: inherit;
}
th.th-filterable { padding-bottom: 0.35rem; }

/* drag & drop материалов */
.drag-handle {
    display: inline-block; flex: 0 0 auto; width: 1.5rem; text-align: center;
    cursor: grab; user-select: none; color: var(--c-text-muted);
    font-size: 1rem; line-height: 1; padding: 0.15rem 0; border-radius: 0.35rem;
}
.drag-handle:hover { background: var(--c-bg); color: var(--c-text); }
.drag-handle:active { cursor: grabbing; }
.dragging { opacity: 0.45; }
.drop-before { box-shadow: 0 -3px 0 0 var(--c-text); }
.drop-after { box-shadow: 0 3px 0 0 var(--c-text); }
.drop-into { outline: 2px dashed var(--c-border); outline-offset: 3px; border-radius: 0.35rem; }

/* индикатор сохранения порядка материалов */
.sort-status {
    position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
    display: flex; align-items: center; gap: 0.6rem;
    max-width: min(24rem, calc(100vw - 2rem));
    background: var(--c-surface); border: 1px solid var(--c-border);
    border-radius: 0.5rem; padding: 0.5rem 0.75rem;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15); font-size: 0.85rem;
}

/* Чтение материалов: контент + боковое содержание */
.learn-layout { display: grid; grid-template-columns: 19rem minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.learn-side { position: sticky; top: 1rem; max-height: calc(100vh - 2rem); overflow: auto; font-size: 0.875rem; }
.side-chapter { font-weight: 600; margin: 0.6rem 0 0.2rem; }
.side-section { margin: 0.25rem 0 0.5rem 0.75rem; }
.side-section > a { color: var(--c-text-muted); }
.side-articles { list-style: none; margin: 0.2rem 0 0 0.75rem; padding: 0; }
.side-articles li { margin: 0.1rem 0; }
.side-articles a { display: inline-block; }
.side-current { font-weight: 600; text-decoration: underline; }
.article-nav { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; flex-wrap: nowrap; }
.article-nav .ml-auto, .article-nav a:last-child:not(:only-child) { margin-left: auto; }
.article-nav .btn { min-width: 0; max-width: calc(50% - 0.4rem); overflow: hidden; white-space: nowrap; }
.article-nav .btn > span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 1000px) {
    /* minmax(0, 1fr), а не 1fr: иначе колонка растягивается до min-content
       длинных строк кода и таблиц и страница вылезает за экран */
    .learn-layout { grid-template-columns: minmax(0, 1fr); }
    .learn-layout > * { min-width: 0; }
    .learn-main { order: 1; min-width: 0; }
    .learn-side { position: static; max-height: none; order: 2; min-width: 0; }
}

/* Панель форматирования markdown и встроенный редактор */
.md-toolbar {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.1rem;
    padding: 0.3rem; margin-bottom: 0.5rem;
    border: 1px solid var(--c-border); border-radius: 0.5rem; background: var(--c-bg);
}
.md-sprite { display: none; }
.md-btn {
    display: inline-flex; align-items: center; justify-content: center;
    width: 2rem; height: 2rem; padding: 0; cursor: pointer;
    border: 1px solid transparent; border-radius: 0.375rem;
    background: transparent; color: var(--c-text);
}
.md-btn:hover { background: var(--c-surface); border-color: var(--c-border); }
.md-btn:active { transform: translateY(1px); }
.md-btn:focus-visible { outline: 2px solid var(--c-text-link); outline-offset: 1px; }
.md-ico {
    width: 1.15rem; height: 1.15rem; fill: none; stroke: currentColor;
    stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.md-sep { width: 1px; align-self: stretch; margin: 0.2rem 0.3rem; background: var(--c-border); }
.md-editor-head {
    display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
    padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--c-border);
}
.md-editor-title { font-weight: 600; }
.md-editor-body {
    width: 100%; min-height: 22rem; font-family: "DejaVu Sans Mono", Consolas, monospace;
    font-size: 0.9rem; line-height: 1.5; white-space: pre; overflow-wrap: normal;
}
.md-figure { margin: 1rem 0; text-align: center; }
.md-figure img { width: 100%; max-width: 100%; height: auto; }
.md-figure figcaption, .md-video-figure figcaption {
    margin-top: 0.4rem; font-size: 0.875rem; color: var(--c-text-muted);
}
.md-video-figure { margin: 1rem 0; text-align: center; }
.md-video { width: 100%; max-width: 100%; border-radius: 0.5rem; background: #000; }