/* ============================================
   Полимерскоп — дизайн-система
   ============================================ */
:root {
  --bg: #ffffff;
  --bg-subtle: #f7f8fa;
  --bg-hover: #f0f2f5;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #0d1117;
  --text-secondary: #57606a;
  --text-muted: #8b949e;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff4ff;
  --accent-soft-text: #1e40af;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;
  --container: 1320px;
  --nav-h: 60px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; cursor: pointer; }
h1 { font-size: 28px; font-weight: 600; letter-spacing: -0.02em; margin: 0 0 0.5em; }
h2 { font-size: 20px; font-weight: 600; margin: 0 0 0.5em; }
h3 { font-size: 16px; font-weight: 600; margin: 0 0 0.5em; }
h4 { font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: .05em; color: var(--text-secondary); margin: 0 0 0.75em; }
p { margin: 0 0 1em; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.topnav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 28px;
}
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 16px; color: var(--text); }
.logo:hover { text-decoration: none; }
.logo-img { height: 32px; width: auto; display: block; }
.logo-mark {
  width: 26px; height: 26px; border-radius: 7px; background: var(--accent);
  display: grid; place-items: center; color: #fff; font-size: 13px; font-weight: 800;
}
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--text-secondary); font-size: 14px; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--text); text-decoration: none; }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 36px; padding: 0 14px;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500;
  background: var(--accent); color: #fff;
  transition: background .15s;
}
.btn:hover { background: var(--accent-hover); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-outline { background: #fff; color: var(--text); border-color: var(--border-strong); }
.btn-outline:hover { background: var(--bg-hover); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text); }
.btn-lg { height: 44px; padding: 0 20px; font-size: 15px; }
.btn-sm { height: 30px; padding: 0 10px; font-size: 13px; }

.search { position: relative; flex: 1; max-width: 460px; }
.search input {
  width: 100%; height: 36px; padding: 0 12px 0 36px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--bg-subtle); font-size: 14px;
  transition: border-color .15s, background .15s;
}
.search input:focus { outline: none; border-color: var(--accent); background: #fff; box-shadow: 0 0 0 3px var(--accent-soft); }
.search::before {
  content: ''; position: absolute; left: 11px; top: 50%;
  width: 16px; height: 16px; transform: translateY(-50%);
  background: var(--text-muted);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-3.5-3.5'/%3E%3C/svg%3E") center/contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-3.5-3.5'/%3E%3C/svg%3E") center/contain no-repeat;
  pointer-events: none;
}

.badge {
  display: inline-flex; align-items: center; gap: 4px;
  height: 22px; padding: 0 8px; border-radius: 999px;
  font-size: 12px; font-weight: 500;
  background: var(--bg-hover); color: var(--text-secondary);
  white-space: nowrap;
}
.badge-accent { background: var(--accent-soft); color: var(--accent-soft-text); }
.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-outline { background: transparent; border: 1px solid var(--border-strong); color: var(--text-secondary); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm);
}
.section { padding: 40px 0; }
.section-sm { padding: 24px 0; }
.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 20px; }

.breadcrumbs { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-muted); margin: 16px 0 8px; }
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs span.sep { color: var(--text-muted); }

.grid-cats { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.cat-tile {
  display: block; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  background: #fff; color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.cat-tile:hover { border-color: var(--accent); box-shadow: var(--shadow); text-decoration: none; }
.cat-tile .cat-name { font-weight: 600; font-size: 15px; color: var(--text); }
.cat-tile .cat-code { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--accent); margin-top: 4px; letter-spacing: .04em; }
.cat-tile .cat-meta { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* Вкладки и чипы-фильтры */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tabs .tab {
  background: none; border: none; padding: 8px 14px; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs .tab:hover { color: var(--text); }
.tabs .tab.active { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.chip-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip-tabs button {
  height: 30px; padding: 0 12px; font-size: 13px;
  border: 1px solid var(--border-strong); border-radius: 999px;
  background: #fff; color: var(--text-secondary);
}
.chip-tabs button:hover { background: var(--bg-hover); color: var(--text); }
.chip-tabs button.active { background: var(--accent-soft); color: var(--accent-soft-text); border-color: var(--accent); }
.chip-tabs button .muted { color: var(--text-muted); }

/* Группы-карточки (виды полимеров / методы переработки) */
.group-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; align-items: start; }
.group-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.group-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--bg-subtle);
  cursor: pointer; user-select: none;
}
.group-head:hover { background: var(--accent-soft); }
.group-chev { color: var(--text-muted); display: grid; place-items: center; transition: transform .15s; }
.group-card.open .group-chev { transform: rotate(180deg); }
.group-icon {
  display: grid; place-items: center; width: 34px; height: 34px;
  border-radius: 9px; background: var(--accent-soft); color: var(--accent); flex: 0 0 auto;
}
.group-title { font-weight: 600; font-size: 15px; color: var(--text); }
.group-count { margin-left: auto; font-size: 12px; color: var(--text-muted); }
.group-families { display: flex; flex-direction: column; }
.family-row {
  display: flex; align-items: center; gap: 8px; padding: 8px 16px;
  border-bottom: 1px solid var(--border); color: var(--text); font-size: 14px;
}
.family-row:last-child { border-bottom: none; }
.family-row:hover { background: var(--bg-subtle); text-decoration: none; }
.family-row .fr-code { margin-left: auto; font-family: var(--font-mono); font-size: 12px; color: var(--accent); }

.catalog-layout { display: grid; grid-template-columns: 260px 1fr; gap: 24px; align-items: start; }
.filters {
  position: sticky; top: calc(var(--nav-h) + 16px);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px;
  max-height: calc(100vh - var(--nav-h) - 32px); overflow-y: auto;
}
.filter-group { padding: 12px 0; border-bottom: 1px solid var(--border); }
.filter-group:first-child { padding-top: 0; }
.filter-group:last-child { border-bottom: none; padding-bottom: 0; }
.filter-option { display: flex; align-items: center; gap: 8px; padding: 5px 0; font-size: 14px; cursor: pointer; }
.filter-option input { accent-color: var(--accent); }
.filter-option .count { margin-left: auto; color: var(--text-muted); font-size: 12px; }

/* Аккордеон-группа в фильтре (каучуки) */
.filter-accordion { margin-top: 6px; border-top: 1px solid var(--border); padding-top: 6px; }
.filter-acc-head {
  display: flex; align-items: center; gap: 8px; width: 100%;
  background: none; border: none; padding: 6px 0; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--text); text-align: left;
}
.filter-acc-head .count { margin-left: auto; color: var(--text-muted); font-size: 12px; font-weight: 400; }
.filter-acc-head .chev { color: var(--text-muted); font-size: 11px; transition: transform .15s; }
.filter-accordion.open .filter-acc-head .chev { transform: rotate(180deg); }
.filter-acc-body { display: flex; flex-direction: column; padding-left: 8px; }

.data-table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.data-table th, .data-table td {
  padding: 11px 14px; text-align: left; font-size: 14px;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  background: var(--bg-subtle); font-weight: 500; color: var(--text-secondary);
  font-size: 12px; text-transform: uppercase; letter-spacing: .04em;
}
.data-table tbody tr:hover { background: var(--bg-hover); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table .grade { font-family: var(--font-mono); font-weight: 600; color: var(--text); }
.data-table .num { font-family: var(--font-mono); font-size: 13px; }

.material-header { padding: 24px 0 20px; border-bottom: 1px solid var(--border); }
.material-header .meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.material-header h1 { margin-bottom: 6px; font-family: var(--font-mono); font-size: 26px; }
.material-header .sub { color: var(--text-secondary); font-size: 15px; }

.material-layout { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; padding: 24px 0 56px; }

.props-table { width: 100%; border-collapse: collapse; }
.props-table th, .props-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; text-align: left; vertical-align: top; }
.props-table th { font-weight: 500; color: var(--text-secondary); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; background: var(--bg-subtle); }
.props-table td.num { font-family: var(--font-mono); font-size: 13px; }
.props-table .method { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); }

.sidebar-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 14px; }
.sidebar-card .kv { display: flex; justify-content: space-between; font-size: 13px; padding: 5px 0; gap: 12px; }
.sidebar-card .kv .k { color: var(--text-secondary); }
.sidebar-card .kv .v { font-family: var(--font-mono); text-align: right; }

.compare-table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.compare-table th, .compare-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 14px; text-align: left; vertical-align: top; }
.compare-table th:first-child, .compare-table td:first-child {
  position: sticky; left: 0; background: var(--bg-subtle);
  font-weight: 500; color: var(--text-secondary); z-index: 1; min-width: 180px;
}
.compare-table thead th { background: var(--bg-subtle); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-secondary); }
.compare-table .num { font-family: var(--font-mono); font-size: 13px; }
.warn-row td { background: var(--warning-soft) !important; }

.compare-picker {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 12px; border: 1px dashed var(--border-strong);
  border-radius: var(--radius); background: var(--bg-subtle);
}
.compare-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-soft-text);
  font-family: var(--font-mono); font-size: 13px; font-weight: 600;
}
.compare-chip button {
  background: none; border: none; color: inherit; font-size: 15px; line-height: 1;
  padding: 0; cursor: pointer;
}

.footer { border-top: 1px solid var(--border); background: var(--bg-subtle); padding: 32px 0 24px; margin-top: 56px; font-size: 13px; color: var(--text-secondary); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 16px; border-top: 1px solid var(--border); }

.flex { display: flex; align-items: center; gap: 8px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-4 { gap: 4px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; }
.mt-0 { margin-top: 0; } .mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.muted { color: var(--text-secondary); }
.tiny { font-size: 12px; color: var(--text-muted); }
.mono { font-family: var(--font-mono); }
.hidden { display: none !important; }
.center { text-align: center; }

/* Герой */
.hero {
  padding: 64px 0 48px;
  background: linear-gradient(180deg, var(--bg-subtle), var(--bg));
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: 40px; line-height: 1.15; max-width: 780px; }
.hero .lead { font-size: 18px; color: var(--text-secondary); max-width: 640px; }
.hero-search { display: flex; gap: 10px; max-width: 660px; margin-top: 24px; flex-wrap: wrap; }
.hero-search .search { max-width: none; }
.hero-inner { display: flex; align-items: center; gap: 48px; }
.hero-text { flex: 1 1 auto; min-width: 0; }
.hero-logo { flex: 0 0 auto; width: 300px; max-width: 32%; height: auto; }

/* Сетка карточек материалов */
.grid-materials { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.mat-card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.mat-card:hover { border-color: var(--accent); box-shadow: var(--shadow); text-decoration: none; }
.mat-card .mat-code { font-family: var(--font-mono); font-weight: 600; font-size: 16px; }
.mat-card .mat-family { font-size: 13px; color: var(--text-muted); }
.mat-props { font-size: 13px; color: var(--text-secondary); display: flex; flex-direction: column; gap: 2px; }
.mat-props .v { font-family: var(--font-mono); color: var(--text); }

/* Панель инструментов каталога */
.table-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.table-toolbar .count { font-size: 13px; color: var(--text-muted); margin-left: auto; }
.view-switch { display: inline-flex; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); overflow: hidden; }
.view-switch button { background: #fff; border: none; padding: 0 12px; height: 32px; font-size: 13px; color: var(--text-secondary); }
.view-switch button.active { background: var(--accent-soft); color: var(--accent-soft-text); }

/* Подвал */
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.footer h4 { margin-bottom: 10px; color: var(--text); }

/* Слайдеры фильтров */
.range-input { width: 100%; accent-color: var(--accent); }
.range-values { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-muted); }

/* Статистика и пустые состояния */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.stat { text-align: center; padding: 18px; }
.stat .n { font-size: 28px; font-weight: 700; font-family: var(--font-mono); }
.stat .l { font-size: 13px; color: var(--text-secondary); }
.empty { padding: 40px 16px; text-align: center; color: var(--text-muted); }
.alert { border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; font-size: 14px; background: var(--bg-subtle); }
.alert-danger { background: var(--danger-soft); border-color: #fecaca; color: var(--danger); }
.alert-warning { background: var(--warning-soft); border-color: #fcd34d; color: var(--text); }

@media (max-width: 900px) {
  .catalog-layout { grid-template-columns: 1fr; }
  .filters { position: static; max-height: none; }
  .material-layout { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-inner { gap: 0; }
  .hero-logo { display: none; }
}