/* =========================================================================
   WIKI MAROZ STUDIOS — базовые стили
   Собственный CSS без сторонних фреймворков. Поддержка светлой/тёмной темы
   через CSS-переменные и [data-theme]; адаптивная вёрстка через flex/grid.
   ========================================================================= */

:root {
    --bg: #f5f7fb;
    --bg-elevated: #ffffff;
    --bg-muted: #eef1f8;
    --text: #1a2033;
    --text-muted: #5b6478;
    --border: #e1e5f0;
    --accent: #4f63e8;
    --accent-hover: #3d4fd6;
    --accent-soft: #eef0ff;
    --success: #1f9d6c;
    --success-soft: #e6f7ef;
    --danger: #e5484d;
    --danger-soft: #fdeceb;
    --warning: #b7791f;
    --warning-soft: #fff6e5;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 6px 24px rgba(20, 30, 60, 0.08);
    --code-bg: #1c2233;
    --code-text: #e8ecf6;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
    --bg: #0e1220;
    --bg-elevated: #161c2e;
    --bg-muted: #1b2236;
    --text: #e8ecf6;
    --text-muted: #97a1bd;
    --border: #262e47;
    --accent: #6b81ff;
    --accent-hover: #8393ff;
    --accent-soft: #232a4a;
    --success: #34caa0;
    --success-soft: #133328;
    --danger: #ff7373;
    --danger-soft: #3a1c22;
    --warning: #e0ac4f;
    --warning-soft: #3a2f16;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    --code-bg: #0b0f1c;
    --code-text: #e8ecf6;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #0e1220;
        --bg-elevated: #161c2e;
        --bg-muted: #1b2236;
        --text: #e8ecf6;
        --text-muted: #97a1bd;
        --border: #262e47;
        --accent: #6b81ff;
        --accent-hover: #8393ff;
        --accent-soft: #232a4a;
        --success: #34caa0;
        --success-soft: #133328;
        --danger: #ff7373;
        --danger-soft: #3a1c22;
        --warning: #e0ac4f;
        --warning-soft: #3a2f16;
        --shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
        --code-bg: #0b0f1c;
    }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

/* Доступность: видимый индикатор фокуса для клавиатурной навигации (WCAG 2.4.7),
   и скрытая до фокуса ссылка "Перейти к содержимому" (WCAG 2.4.1 Bypass Blocks). */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible,
select:focus-visible, [tabindex]:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 1000;
    background: var(--accent);
    color: #fff;
    padding: 10px 16px;
    border-radius: 0 0 8px 0;
}
.skip-link:focus {
    left: 0;
}
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.6;
    transition: background .2s ease, color .2s ease;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
code, pre { font-family: "Fira Code", Consolas, "Courier New", monospace; }
code { background: var(--bg-muted); padding: .15em .4em; border-radius: 5px; font-size: .9em; }
pre { background: var(--code-bg); color: var(--code-text); padding: 16px 18px; border-radius: var(--radius-sm); overflow-x: auto; }
pre code { background: none; padding: 0; color: inherit; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 20px; }

/* ---------------------------------------------------------------- Navbar */
.navbar {
    position: sticky; top: 0; z-index: 50;
    background: var(--bg-elevated); border-bottom: 1px solid var(--border);
}
.navbar-inner { display: flex; align-items: center; gap: 24px; padding: 12px 20px; max-width: 1180px; margin: 0 auto; }
.navbar-brand { font-weight: 800; font-size: 18px; color: var(--text); letter-spacing: .2px; }
.navbar-brand span { color: var(--accent); }
.navbar-links { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.navbar-links a { color: var(--text-muted); padding: 8px 12px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; }
.navbar-links a:hover, .navbar-links a.is-active { color: var(--text); background: var(--bg-muted); text-decoration: none; }
.navbar-actions { display: flex; align-items: center; gap: 10px; }
.navbar-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 10px; color: var(--text); cursor: pointer; }
.theme-toggle { background: var(--bg-muted); border: 1px solid var(--border); border-radius: 20px; padding: 6px 10px; cursor: pointer; color: var(--text); font-size: 14px; }
.user-menu { position: relative; }
.user-chip { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 20px; background: var(--bg-muted); border: 1px solid var(--border); cursor: pointer; color: var(--text); font-size: 13px; font-weight: 600; }
.avatar { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; background: var(--accent-soft); }
.user-dropdown { position: absolute; right: 0; top: calc(100% + 8px); background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: var(--shadow); min-width: 220px; padding: 8px; display: none; }
.user-dropdown.is-open { display: block; }
.user-dropdown a, .user-dropdown button { display: block; width: 100%; text-align: left; padding: 9px 10px; border-radius: 6px; color: var(--text); background: none; border: none; font-size: 14px; cursor: pointer; }
.user-dropdown a:hover, .user-dropdown button:hover { background: var(--bg-muted); text-decoration: none; }
.user-dropdown hr { border: none; border-top: 1px solid var(--border); margin: 6px 0; }

/* ------------------------------------------------------------------ Hero */
.hero { padding: 64px 0 48px; text-align: center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); max-width: 780px; margin: 0 auto .4em; }
.hero p.lead { color: var(--text-muted); max-width: 640px; margin: 0 auto 28px; font-size: 17px; }
.hero-search { max-width: 560px; margin: 0 auto; display: flex; gap: 8px; }
.hero-search input { flex: 1; }
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; max-width: 780px; margin: 40px auto 0; }
.stat-tile { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; text-align: center; }
.stat-tile b { display: block; font-size: 24px; color: var(--accent); }
.stat-tile span { color: var(--text-muted); font-size: 13px; }

/* --------------------------------------------------------------- Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 18px; border-radius: var(--radius-sm); font-weight: 600; font-size: 14px; border: 1px solid transparent; cursor: pointer; background: var(--accent); color: #fff; }
.btn:hover { background: var(--accent-hover); color: #fff; text-decoration: none; }
.btn-secondary { background: var(--bg-muted); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--border); color: var(--text); }
.btn-outline { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c53d41; color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ----------------------------------------------------------------- Cards */
.card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-sidebar { grid-template-columns: 260px 1fr; align-items: start; }

.course-card { display: flex; flex-direction: column; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .15s ease; }
.course-card:hover { transform: translateY(-3px); }
.course-card__cover { height: 140px; background: linear-gradient(135deg, var(--accent-soft), var(--bg-muted)); display: flex; align-items: center; justify-content: center; font-size: 42px; }
.course-card__body { padding: 16px 18px; flex: 1; display: flex; flex-direction: column; gap: 8px; }
.course-card__meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 700; background: var(--bg-muted); color: var(--text-muted); }
.badge-accent { background: var(--accent-soft); color: var(--accent); }
.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }

.category-pill { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg-elevated); }
.category-pill .icon { font-size: 22px; }
.category-pill small { display: block; color: var(--text-muted); }

/* ---------------------------------------------------------------- Forms */
label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin: 14px 0 6px; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=search], input[type=url], textarea, select {
    width: 100%; padding: 10px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border);
    background: var(--bg-elevated); color: var(--text); font-size: 14px; font-family: inherit;
}
textarea { resize: vertical; min-height: 100px; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.form-error { color: var(--danger); font-size: 12px; margin-top: 4px; }
.form-hint { color: var(--text-muted); font-size: 12px; margin-top: 4px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; margin: 10px 0; }
.checkbox-row input { width: auto; }
fieldset { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px 16px; margin: 16px 0; }
legend { padding: 0 6px; font-weight: 700; font-size: 13px; color: var(--text-muted); }

/* --------------------------------------------------------------- Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 14px; display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.alert-success { background: var(--success-soft); color: var(--success); border: 1px solid var(--success); }
.alert-error { background: var(--danger-soft); color: var(--danger); border: 1px solid var(--danger); }
.alert button { background: none; border: none; color: inherit; cursor: pointer; font-size: 16px; }

/* --------------------------------------------------------------- Tables */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tr:hover td { background: var(--bg-muted); }
.table-responsive { overflow-x: auto; }

/* ------------------------------------------------------------ Pagination */
.pagination { display: flex; gap: 6px; justify-content: center; margin: 28px 0; flex-wrap: wrap; }
.pagination a, .pagination span { padding: 7px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); font-size: 13px; color: var(--text); }
.pagination a:hover { background: var(--bg-muted); text-decoration: none; }
.pagination .is-current { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ------------------------------------------------------------- Sidebar/TOC */
.sidebar-nav { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; position: sticky; top: 80px; }
.sidebar-nav h4 { font-size: 12px; text-transform: uppercase; color: var(--text-muted); letter-spacing: .05em; margin-bottom: 10px; }
.sidebar-nav .chapter { margin-bottom: 10px; }
.sidebar-nav .chapter > strong { font-size: 13px; display: block; margin-bottom: 4px; }
.sidebar-nav .lesson-link { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 6px; font-size: 13px; color: var(--text-muted); }
.sidebar-nav .lesson-link:hover { background: var(--bg-muted); text-decoration: none; }
.sidebar-nav .lesson-link.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 700; }
.sidebar-nav .lesson-link.is-done::before { content: "✔"; color: var(--success); }
.sidebar-nav .lesson-link:not(.is-done)::before { content: "○"; color: var(--text-muted); }

/* ---------------------------------------------------------- Reading progress */
.reading-progress-track { position: sticky; top: 57px; z-index: 40; height: 3px; background: var(--bg-muted); }
.reading-progress-bar { height: 100%; width: 0; background: var(--accent); transition: width .1s linear; }

/* -------------------------------------------------------------------- TOC */
.toc-block { position: sticky; top: 80px; }
.toc-list { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--border); }
.toc-list li { margin: 2px 0; }
.toc-list li.toc-sub { padding-left: 14px; }
.toc-list a { display: block; padding: 5px 12px; font-size: 13px; color: var(--text-muted); border-left: 2px solid transparent; margin-left: -2px; }
.toc-list a:hover { color: var(--text); text-decoration: none; }
.toc-list a.is-active { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }

/* ----------------------------------------------------- Code: lines/fullscreen */
pre.code-with-lines { display: flex; gap: 12px; padding-left: 10px; position: relative; }
.code-line-numbers { display: flex; flex-direction: column; text-align: right; color: #5b6478; user-select: none; padding-right: 10px; border-right: 1px solid rgba(255,255,255,.12); font-size: 13px; line-height: 1.55; flex-shrink: 0; }
pre.code-with-lines code.hljs { padding: 0 !important; background: transparent !important; flex: 1; overflow-x: auto; }
.code-fullscreen-btn { position: absolute; top: 8px; right: 44px; font-size: 12px; padding: 4px 8px; border-radius: 6px; border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.08); color: #e8ecf6; cursor: pointer; }
pre.is-fullscreen { position: fixed; inset: 16px; z-index: 200; overflow: auto; box-shadow: 0 20px 60px rgba(0,0,0,.6); }
body.has-fullscreen-code { overflow: hidden; }

/* --------------------------------------------------------------- Редактор кода */
.wms-editor { border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; margin: 8px 0; }
.wms-editor-toolbar { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; padding: 6px 8px; background: var(--bg-muted); border-bottom: 1px solid var(--border); }
.wms-editor-toolbar button { font-size: 12px; padding: 5px 9px; border-radius: 6px; border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text); cursor: pointer; }
.wms-editor-toolbar button:hover { background: var(--accent-soft); border-color: var(--accent); }
.wms-editor-status { margin-left: auto; font-size: 11px; color: var(--text-muted); }
.wms-editor-host .CodeMirror { height: 280px; font-family: "Fira Code", Consolas, monospace; }
.wms-editor-host .CodeMirror-fullscreen { z-index: 500; }
@media (max-width: 640px) {
    .wms-editor-toolbar { gap: 4px; }
    .wms-editor-toolbar button { padding: 4px 6px; font-size: 11px; }
    .wms-editor-status { display: none; }
    .wms-editor-host .CodeMirror { height: 220px; font-size: 13px; }
}

/* ------------------------------------------------------------ Lesson page */
.lesson-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.lesson-content { font-size: 16px; }
.lesson-content h3 { margin-top: 1.6em; }
.lesson-content ul, .lesson-content ol { padding-left: 22px; }
.callout { border-radius: var(--radius-sm); padding: 14px 16px; margin: 18px 0; border-left: 4px solid; }
.callout-mistakes { background: var(--danger-soft); border-color: var(--danger); }
.callout-tips { background: var(--success-soft); border-color: var(--success); }
.callout h4 { margin: 0 0 8px; font-size: 14px; }

.exercise-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; background: var(--bg-elevated); }
.exercise-card__head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.code-editor { width: 100%; min-height: 160px; font-family: "Fira Code", Consolas, monospace; background: var(--code-bg); color: var(--code-text); border-radius: var(--radius-sm); padding: 14px; border: 1px solid var(--border); font-size: 13px; }

.progress-bar { height: 8px; background: var(--bg-muted); border-radius: 6px; overflow: hidden; }
.progress-bar__fill { height: 100%; background: var(--accent); }

.comment { display: flex; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.comment__body { flex: 1; }
.comment__meta { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.comment__actions { display: flex; gap: 12px; margin-top: 6px; font-size: 12px; }
.comment__actions button { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 0; }
.comment__actions button:hover { color: var(--accent); }

/* -------------------------------------------------------------- Footer */
footer { border-top: 1px solid var(--border); margin-top: 60px; padding: 32px 0; color: var(--text-muted); font-size: 13px; }
footer a { color: var(--text-muted); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.footer-grid h5 { color: var(--text); font-size: 13px; margin-bottom: 8px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 6px; }

/* ------------------------------------------------------------ Admin shell */
.admin-shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.admin-sidebar { background: var(--bg-elevated); border-right: 1px solid var(--border); padding: 18px 14px; }
.admin-sidebar .brand { font-weight: 800; margin-bottom: 20px; display: block; padding: 0 8px; }
.admin-sidebar nav a { display: block; padding: 9px 10px; border-radius: 8px; color: var(--text-muted); font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.admin-sidebar nav a:hover, .admin-sidebar nav a.is-active { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.admin-sidebar .group-label { font-size: 11px; text-transform: uppercase; color: var(--text-muted); margin: 16px 8px 6px; letter-spacing: .06em; }
.admin-main { padding: 24px 28px 60px; }
.admin-topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.admin-topbar h1 { font-size: 20px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }

/* ----------------------------------------------------------- Utilities */
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.small { font-size: 12px; }
.section { padding: 48px 0; }
.section-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 10px; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 40px; margin-bottom: 12px; }

/* ------------------------------------------------------------- Responsive */
@media (max-width: 960px) {
    .grid-sidebar { grid-template-columns: 1fr; }
    .admin-shell { grid-template-columns: 1fr; }
    .admin-sidebar { display: none; }
    .admin-sidebar.is-open { display: block; }
    .stats-row { grid-template-columns: repeat(2, 1fr); }
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    .navbar-links { display: none; }
    .navbar-links.is-open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-elevated); border-bottom: 1px solid var(--border); padding: 10px; }
    .navbar-toggle { display: inline-flex; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .stats-row { grid-template-columns: repeat(2, 1fr); }
    .hero-search { flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; }
}

@media print {
    .navbar, footer, .no-print { display: none !important; }
}