/*
 * Apple-bright presentation layer for the renewable-energy model library.
 * Loaded after the shared secondary-page skin.  This file is intentionally
 * scoped to the catalog surface so workbench and course pages keep their own
 * layouts and model rendering rules.
 */

body[data-surface="catalog"] {
  color-scheme: light;
  --catalog-bg: #e6edf3;
  --catalog-surface: rgba(243, 247, 250, 0.86);
  --catalog-surface-solid: #f8fafc;
  --catalog-surface-soft: #e8eef3;
  --catalog-ink: #10151c;
  --catalog-copy: #3f4b59;
  --catalog-muted: #728091;
  --catalog-line: rgba(16, 36, 58, 0.1);
  --catalog-line-strong: rgba(16, 36, 58, 0.18);
  --catalog-blue: #087cff;
  --catalog-blue-dark: #0066d6;
  --catalog-blue-soft: rgba(0, 122, 255, 0.1);
  --catalog-cyan: #00a6c8;
  --catalog-shadow-sm: 0 1px 2px rgba(26, 39, 53, 0.05), 0 7px 24px rgba(26, 39, 53, 0.06);
  --catalog-shadow-md: 0 2px 5px rgba(26, 39, 53, 0.04), 0 18px 45px rgba(26, 39, 53, 0.09);
  --catalog-shadow-lg: 0 2px 5px rgba(18, 36, 56, 0.05), 0 30px 85px rgba(18, 36, 56, 0.12);
  --catalog-radius-sm: 12px;
  --catalog-radius: 20px;
  --catalog-radius-lg: 28px;
  --ink: var(--catalog-ink);
  --text: var(--catalog-ink);
  --muted: var(--catalog-muted);
  --line: var(--catalog-line);
  --panel: var(--catalog-surface);
  --bg: var(--catalog-bg);
  --gold: var(--catalog-blue);
  --accent: var(--catalog-blue);
  --cyan: var(--catalog-blue);
  min-height: 100svh;
  background:
    radial-gradient(circle at 84% 2%, rgba(91, 177, 229, 0.28), transparent 24rem),
    radial-gradient(circle at 32% 18%, rgba(239, 244, 248, 0.82), transparent 30rem),
    linear-gradient(180deg, #edf2f6 0, #e3eaf0 42%, #dce5ec 100%);
  color: var(--catalog-ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-surface="catalog"]::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.42;
  background-image: linear-gradient(rgba(61, 103, 140, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(61, 103, 140, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, transparent 58%);
}

body[data-surface="catalog"] ::selection {
  color: #061326;
  background: rgba(64, 170, 255, 0.3);
}

body[data-surface="catalog"] :is(button, input, select) {
  accent-color: var(--catalog-blue);
}

body[data-surface="catalog"] :is(button, a, input, select, summary):focus-visible {
  outline: 3px solid rgba(0, 122, 255, 0.44);
  outline-offset: 3px;
}

body[data-surface="catalog"] .skip {
  color: #fff;
  background: var(--catalog-blue);
  border-radius: 11px;
  box-shadow: var(--catalog-shadow-md);
}

/* Glass navigation bar */
body[data-surface="catalog"] .masthead {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 84px;
  padding: 0 clamp(20px, 2.4vw, 46px);
  gap: 24px;
  color: var(--catalog-ink);
  background: rgba(238, 243, 247, 0.84);
  border-color: rgba(10, 41, 71, 0.09);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8), 0 8px 30px rgba(28, 50, 70, 0.035);
  backdrop-filter: saturate(1.7) blur(24px);
  -webkit-backdrop-filter: saturate(1.7) blur(24px);
}

body[data-surface="catalog"] .identity {
  gap: 22px;
  color: var(--catalog-ink);
}

body[data-surface="catalog"] .identity .university-mark {
  width: clamp(210px, 15.5vw, 278px);
  height: 58px;
  filter: drop-shadow(0 1px 1px rgba(2, 39, 73, 0.06));
}

body[data-surface="catalog"] .identity .university-mark #university-wordmark {
  fill: #102d4b !important;
}

body[data-surface="catalog"] .identity-course {
  padding-left: 22px;
  border-color: rgba(18, 47, 73, 0.14);
}

body[data-surface="catalog"] .identity strong {
  color: #101c29;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: 0.1em;
}

body[data-surface="catalog"] .identity small {
  color: #758394;
  font-weight: 450;
}

body[data-surface="catalog"] .header-nav {
  gap: 7px;
  padding: 5px;
  border: 1px solid rgba(17, 43, 67, 0.08);
  border-radius: 999px;
  background: rgba(230, 235, 241, 0.68);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.8);
}

body[data-surface="catalog"] .header-nav .home {
  min-height: 38px;
  padding: 0 15px;
  border: 0;
  border-radius: 999px;
  color: #546273;
  font-size: 12px;
  font-weight: 550;
  transition: color 180ms ease, background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

body[data-surface="catalog"] .header-nav .home:hover {
  color: #0c1825;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 1px 4px rgba(16, 34, 51, 0.1);
  transform: translateY(-1px);
}

body[data-surface="catalog"] .header-nav .home:last-child {
  color: #fff;
  background: var(--catalog-blue);
  box-shadow: 0 6px 16px rgba(0, 122, 255, 0.24);
}

body[data-surface="catalog"] .header-nav .home:last-child:hover {
  background: var(--catalog-blue-dark);
  box-shadow: 0 8px 20px rgba(0, 102, 214, 0.3);
}

/* Navigation rail */
body[data-surface="catalog"] .workspace {
  grid-template-columns: 260px minmax(0, 1fr);
  max-width: 2400px;
  margin: 0 auto;
}

body[data-surface="catalog"] .sidebar {
  top: 84px;
  min-height: calc(100svh - 84px);
  max-height: calc(100svh - 84px);
  padding: 26px 14px;
  color: var(--catalog-copy);
  background: rgba(230, 237, 243, 0.78);
  border-color: rgba(19, 44, 66, 0.09);
  backdrop-filter: blur(24px) saturate(1.35);
  -webkit-backdrop-filter: blur(24px) saturate(1.35);
  scrollbar-color: rgba(80, 103, 125, 0.24) transparent;
}

body[data-surface="catalog"] .side-title {
  padding: 0 14px 12px;
  color: #8a96a4;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.12em;
}

body[data-surface="catalog"] .domain {
  min-height: 45px;
  margin: 2px 0;
  padding: 9px 12px;
  gap: 10px;
  color: #596879;
  border: 1px solid transparent;
  border-radius: 13px;
  background: transparent;
  font-size: 12px;
  font-weight: 520;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

body[data-surface="catalog"] .domain svg,
body[data-surface="catalog"] .domain b {
  color: #8896a6;
}

body[data-surface="catalog"] .domain:hover {
  color: #182535;
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(20, 54, 82, 0.08);
  box-shadow: 0 3px 12px rgba(26, 47, 67, 0.05);
  transform: translateX(2px);
}

body[data-surface="catalog"] .domain[aria-pressed="true"] {
  color: #075cae;
  background: rgba(255, 255, 255, 0.96);
  border-color: rgba(0, 122, 255, 0.14);
  border-left: 1px solid rgba(0, 122, 255, 0.14);
  box-shadow: 0 7px 20px rgba(30, 62, 91, 0.08), inset 3px 0 var(--catalog-blue);
}

body[data-surface="catalog"] .domain[aria-pressed="true"] :is(svg, b) {
  color: var(--catalog-blue);
}

body[data-surface="catalog"] .domain-children {
  margin: 5px 9px 15px 21px;
  padding-left: 10px;
  border-color: rgba(17, 58, 94, 0.11);
}

body[data-surface="catalog"] .domain-model {
  padding: 7px 8px;
  color: #7c8997;
  border-radius: 8px;
  font-size: 11px;
  transition: color 160ms ease, background 160ms ease;
}

body[data-surface="catalog"] .domain-model:hover,
body[data-surface="catalog"] .domain-model[aria-current] {
  color: #086aca;
  background: rgba(0, 122, 255, 0.08);
}

body[data-surface="catalog"] .side-note {
  margin: 22px 8px 0;
  padding: 19px 7px;
  color: #8793a0;
  border-color: rgba(20, 48, 73, 0.09);
  font-size: 10px;
}

body[data-surface="catalog"] .side-note strong {
  color: #4d5d6e;
  font-weight: 600;
}

body[data-surface="catalog"] .side-note a {
  color: var(--catalog-blue-dark);
}

/* Main gallery */
body[data-surface="catalog"] .main {
  width: 100%;
  max-width: 1800px;
  padding: 24px clamp(24px, 3vw, 54px) 54px;
  background: transparent;
}

body[data-surface="catalog"] .breadcrumbs {
  margin: 0 0 14px;
  gap: 8px;
  color: #97a2af;
  font-size: 11px;
}

body[data-surface="catalog"] .breadcrumbs a {
  color: #667587;
}

body[data-surface="catalog"] .breadcrumbs a:hover {
  color: var(--catalog-blue);
}

body[data-surface="catalog"] .breadcrumbs [aria-current] {
  color: #2e3d4e;
}

body[data-surface="catalog"] .domain-hero {
  min-height: 290px;
  grid-template-columns: minmax(290px, 0.82fr) minmax(430px, 1.18fr);
  margin-bottom: 30px;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 83% 18%, rgba(74, 181, 255, 0.22), transparent 34%),
    linear-gradient(135deg, rgba(248, 250, 252, 0.93), rgba(226, 235, 243, 0.9));
  border: 1px solid rgba(18, 54, 86, 0.1);
  border-radius: var(--catalog-radius-lg);
  box-shadow: var(--catalog-shadow-lg);
}

body[data-surface="catalog"] .domain-hero::before {
  content: "";
  position: absolute;
  inset: -30% 45% -35% -10%;
  z-index: -1;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.7), transparent 68%);
}

body[data-surface="catalog"] .domain-hero::after {
  content: "";
  position: absolute;
  width: 210px;
  height: 210px;
  right: 39%;
  bottom: -146px;
  z-index: 0;
  pointer-events: none;
  border: 1px solid rgba(0, 122, 255, 0.13);
  border-radius: 50%;
  box-shadow: 0 0 0 35px rgba(0, 122, 255, 0.025), 0 0 0 75px rgba(0, 122, 255, 0.018);
}

body[data-surface="catalog"] .hero-copy {
  z-index: 2;
  padding: 36px 34px 32px 40px;
}

body[data-surface="catalog"] .hero-kicker {
  margin-bottom: 20px;
  color: var(--catalog-blue);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.16em;
}

body[data-surface="catalog"] .section-intro {
  margin-bottom: 22px;
}

body[data-surface="catalog"] .section-intro h1 {
  margin-bottom: 13px;
  color: #0b1119;
  font-size: clamp(31px, 2.45vw, 50px);
  font-weight: 680 !important;
  letter-spacing: -0.035em;
  line-height: 1.14;
}

body[data-surface="catalog"] .section-intro p {
  max-width: 510px;
  color: #687688;
  font-size: 13px;
  line-height: 1.75;
}

body[data-surface="catalog"] .hero-bottom {
  gap: 21px;
}

body[data-surface="catalog"] .section-count {
  color: #7c8998;
  font-size: 11px;
}

body[data-surface="catalog"] .section-count strong {
  color: #0b1119;
  font-size: 33px;
  font-weight: 620;
  letter-spacing: -0.04em;
}

body[data-surface="catalog"] .hero-capabilities {
  padding-left: 20px;
  color: #687787;
  border-color: rgba(16, 43, 67, 0.13);
  font-size: 10px;
  font-weight: 550;
}

body[data-surface="catalog"] .featured-model {
  min-height: 290px;
  overflow: hidden;
  background: #202a35;
  border-left: 1px solid rgba(13, 38, 60, 0.09);
}

body[data-surface="catalog"] .featured-preview {
  min-height: 236px;
  background: radial-gradient(circle at 52% 42%, #3b4a59, #202a34 72%);
}

body[data-surface="catalog"] .featured-image {
  transform: scale(1.012);
  filter: saturate(1.08) contrast(1.02) brightness(1.04);
  mask-image: none;
  transition: transform 620ms cubic-bezier(0.22, 1, 0.36, 1), filter 620ms ease;
}

body[data-surface="catalog"] .featured-preview:hover .featured-image {
  transform: scale(1.055);
  filter: saturate(1.13) contrast(1.04) brightness(1.06);
}

body[data-surface="catalog"] .featured-caption {
  left: 20px;
  right: 20px;
  bottom: 12px;
  padding: 12px 13px;
  color: #fff;
  text-shadow: none;
  background: rgba(17, 25, 34, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(17px) saturate(1.35);
  -webkit-backdrop-filter: blur(17px) saturate(1.35);
}

body[data-surface="catalog"] .featured-caption span {
  color: #b8c5d0;
}

body[data-surface="catalog"] .featured-caption strong {
  color: #fff;
  font-weight: 580;
}

body[data-surface="catalog"] .featured-caption svg {
  color: #65caff;
}

body[data-surface="catalog"] .featured-actions {
  position: relative;
  z-index: 3;
  justify-content: center;
  gap: 3px;
  padding: 9px;
  background: rgba(248, 250, 252, 0.96);
  border-top: 1px solid rgba(16, 38, 58, 0.1);
}

body[data-surface="catalog"] .mode-link {
  min-height: 36px;
  padding: 8px 15px;
  color: #5e6d7d;
  border-radius: 999px;
  font-weight: 560;
  transition: color 180ms ease, background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

body[data-surface="catalog"] .mode-link:hover {
  color: #0d1b2a;
  background: #fff;
  box-shadow: 0 2px 9px rgba(17, 42, 65, 0.09);
  transform: translateY(-1px);
}

body[data-surface="catalog"] .featured-actions .mode-link:first-child {
  color: #fff;
  background: var(--catalog-blue);
  border: 0;
  border-radius: 999px;
  box-shadow: 0 5px 14px rgba(0, 122, 255, 0.22);
}

body[data-surface="catalog"] .featured-actions .mode-link:first-child:hover {
  color: #fff;
  background: var(--catalog-blue-dark);
}

/* Search and continuation controls */
body[data-surface="catalog"] .catalog-utilities {
  min-height: 34px;
  margin-bottom: 13px;
}

body[data-surface="catalog"] .collection-label {
  color: #172230;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

body[data-surface="catalog"] .collection-label small {
  color: #8b97a4;
  font-weight: 550;
}

body[data-surface="catalog"] .resume {
  min-height: 36px;
  margin: 0;
  padding: 6px 13px;
  color: #5b6a7a;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(17, 48, 76, 0.09);
  border-radius: 999px;
  box-shadow: var(--catalog-shadow-sm);
}

body[data-surface="catalog"] .resume strong {
  color: #223245;
}

body[data-surface="catalog"] .resume:hover {
  color: var(--catalog-blue);
  border-color: rgba(0, 122, 255, 0.22);
  background: #fff;
}

body[data-surface="catalog"] .toolbar {
  position: sticky;
  top: 94px;
  z-index: 20;
  gap: 8px;
  padding: 8px;
  background: rgba(232, 239, 245, 0.84);
  border: 1px solid rgba(18, 47, 73, 0.08);
  border-radius: 18px;
  box-shadow: 0 7px 26px rgba(23, 46, 69, 0.06);
  backdrop-filter: blur(22px) saturate(1.5);
  -webkit-backdrop-filter: blur(22px) saturate(1.5);
}

body[data-surface="catalog"] .search-wrap {
  min-height: 46px;
  padding: 0 14px;
  color: #778696;
  background: rgba(248, 250, 252, 0.9) !important;
  border: 1px solid rgba(19, 49, 76, 0.1) !important;
  border-radius: 13px !important;
  box-shadow: inset 0 1px 1px rgba(13, 39, 61, 0.025), 0 1px 3px rgba(23, 43, 61, 0.04);
  transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

body[data-surface="catalog"] .search-wrap:focus-within {
  background: #fff !important;
  border-color: rgba(0, 122, 255, 0.45) !important;
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1), 0 7px 18px rgba(27, 63, 94, 0.06);
}

body[data-surface="catalog"] .search-wrap input {
  color: #172230;
  caret-color: var(--catalog-blue);
  font-size: 13px;
}

body[data-surface="catalog"] .search-wrap input::placeholder {
  color: #929daa;
}

body[data-surface="catalog"] .search-shortcut {
  color: #8e99a5;
  background: #f2f4f7;
  border-color: rgba(18, 47, 73, 0.1);
  border-radius: 6px;
}

body[data-surface="catalog"] .clear-search {
  color: #7f8b98;
}

body[data-surface="catalog"] .clear-search:hover {
  color: #142333;
  background: #edf1f5;
}

body[data-surface="catalog"] .advanced-filters summary,
body[data-surface="catalog"] .saved-toggle {
  min-height: 46px;
  padding: 10px 14px;
  color: #536272;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(18, 47, 73, 0.1);
  border-radius: 13px;
  box-shadow: 0 1px 3px rgba(23, 43, 61, 0.04);
  font-size: 11px;
  font-weight: 560;
}

body[data-surface="catalog"] .advanced-filters[open] summary,
body[data-surface="catalog"] .saved-toggle:hover {
  color: #152333;
  background: #fff;
  border-color: rgba(0, 122, 255, 0.2);
}

body[data-surface="catalog"] .saved-toggle[aria-pressed="true"] {
  color: #0067ce;
  background: rgba(0, 122, 255, 0.09);
  border-color: rgba(0, 122, 255, 0.25);
}

body[data-surface="catalog"] .saved-toggle b {
  min-width: 18px;
  padding: 2px 5px;
  color: inherit;
  background: rgba(120, 137, 153, 0.1);
  border-radius: 999px;
  font-weight: 650;
  text-align: center;
}

body[data-surface="catalog"] .advanced-popover {
  top: calc(100% + 9px);
  padding: 18px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(19, 49, 76, 0.11);
  border-radius: 17px;
  box-shadow: var(--catalog-shadow-lg);
  backdrop-filter: blur(28px) saturate(1.5);
  -webkit-backdrop-filter: blur(28px) saturate(1.5);
}

body[data-surface="catalog"] .advanced-popover .select-wrap span {
  color: #6f7d8d;
}

body[data-surface="catalog"] .advanced-popover select {
  color: #263544;
  background: #f2f5f8;
  border: 1px solid rgba(17, 47, 73, 0.1);
  border-radius: 9px;
}

body[data-surface="catalog"] .result-row {
  margin: 15px 2px 13px;
}

body[data-surface="catalog"] .result {
  color: #7d8996;
  font-size: 11px;
}

body[data-surface="catalog"] .filter-chip {
  min-height: 29px;
  padding: 5px 10px;
  color: #0764bd;
  background: rgba(0, 122, 255, 0.08);
  border: 1px solid rgba(0, 122, 255, 0.16);
  border-radius: 999px;
}

body[data-surface="catalog"] .filter-chip:hover {
  background: rgba(0, 122, 255, 0.14);
}

body[data-surface="catalog"] .reset-filters {
  color: var(--catalog-blue-dark);
}

/* Product cards */
body[data-surface="catalog"] .cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(15px, 1.35vw, 23px);
  perspective: 1400px;
}

body[data-surface="catalog"] .card {
  --card-x: 50%;
  --card-y: 22%;
  overflow: hidden;
  isolation: isolate;
  color: var(--catalog-ink);
  background: rgba(247, 250, 252, 0.88);
  border: 1px solid rgba(15, 45, 72, 0.09);
  border-radius: var(--catalog-radius);
  box-shadow: var(--catalog-shadow-sm);
  transform: translateY(0) scale(1);
  transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1), border-color 260ms ease, box-shadow 420ms cubic-bezier(0.22, 1, 0.36, 1), background 260ms ease;
}

body[data-surface="catalog"] .card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(260px circle at var(--card-x) var(--card-y), rgba(255, 255, 255, 0.22), transparent 72%);
  transition: opacity 260ms ease;
}

body[data-surface="catalog"] .card:hover,
body[data-surface="catalog"] .card:focus-within {
  background: #fff;
  border-color: rgba(0, 122, 255, 0.19);
  box-shadow: var(--catalog-shadow-md);
  transform: translateY(-6px) scale(1.006);
}

body[data-surface="catalog"] .card:hover::after {
  opacity: 1;
}

body[data-surface="catalog"] .card.last-selected {
  border-color: rgba(0, 122, 255, 0.46) !important;
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.08), var(--catalog-shadow-md);
}

body[data-surface="catalog"] .card-open {
  color: inherit;
}

body[data-surface="catalog"] .card-visual {
  height: auto;
  aspect-ratio: 16 / 10;
  margin: 0;
  overflow: hidden;
  background: #27333e;
  border-bottom: 1px solid rgba(17, 43, 66, 0.09);
}

body[data-surface="catalog"] .card-visual::after {
  display: block;
  inset: 55% 0 0;
  background: linear-gradient(transparent, rgba(15, 22, 29, 0.42));
}

body[data-surface="catalog"] .model-preview {
  transform: scale(1.004);
  filter: saturate(1.04) contrast(1.015) brightness(1.025);
  transition: transform 620ms cubic-bezier(0.22, 1, 0.36, 1), filter 620ms ease;
}

body[data-surface="catalog"] .card:hover .model-preview {
  transform: scale(1.048);
  filter: saturate(1.1) contrast(1.03) brightness(1.045);
}

body[data-surface="catalog"] .preview-detail {
  left: 12px;
  bottom: 11px;
  z-index: 2;
  padding: 5px 8px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(17, 25, 33, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

body[data-surface="catalog"] .card-copy {
  padding: 18px 19px 2px;
}

body[data-surface="catalog"] .card h2 {
  margin-bottom: 8px;
  color: #121a24;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.012em;
  line-height: 1.45;
}

body[data-surface="catalog"] .card p {
  color: #697788;
  font-size: 11px;
  line-height: 1.75;
}

body[data-surface="catalog"] .card-meta {
  color: #8995a2;
  font-size: 10px;
}

body[data-surface="catalog"] .model-actions {
  position: relative;
  z-index: 5;
  gap: 3px;
  margin: 0 13px 13px;
  padding: 4px;
  background: #f0f3f6;
  border: 0;
  border-radius: 999px;
}

body[data-surface="catalog"] .model-actions .mode-link {
  min-height: 34px;
  padding: 8px 5px;
  color: #647282;
  border-radius: 999px;
  font-size: 10px;
}

body[data-surface="catalog"] .model-actions .mode-link:first-child {
  color: #096dcc;
  background: #fff;
  box-shadow: 0 2px 7px rgba(22, 46, 68, 0.1);
}

body[data-surface="catalog"] .model-actions .mode-link + .mode-link::before {
  display: none;
}

body[data-surface="catalog"] .save-model {
  z-index: 6;
  top: 10px;
  right: 10px;
  width: 36px;
  height: 36px;
  color: rgba(255, 255, 255, 0.77);
  background: rgba(15, 25, 34, 0.44);
  border: 1px solid rgba(255, 255, 255, 0.17);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: color 180ms ease, background 180ms ease, transform 180ms ease, border-color 180ms ease;
}

body[data-surface="catalog"] .save-model:hover {
  color: #fff;
  background: rgba(16, 27, 38, 0.7);
  border-color: rgba(255, 255, 255, 0.32);
  transform: scale(1.06);
}

body[data-surface="catalog"] .save-model[aria-pressed="true"] {
  color: #fff;
  background: rgba(0, 122, 255, 0.88);
  border-color: rgba(255, 255, 255, 0.38);
}

body[data-surface="catalog"] .save-model[aria-pressed="true"] svg {
  fill: rgba(255, 255, 255, 0.28);
}

body[data-surface="catalog"] .empty,
body[data-surface="catalog"] .loading {
  color: #718091;
  background: rgba(255, 255, 255, 0.78);
  border: 1px dashed rgba(27, 65, 99, 0.2);
  border-radius: var(--catalog-radius);
  box-shadow: var(--catalog-shadow-sm);
}

body[data-surface="catalog"] .empty h2 {
  color: #172433;
}

body[data-surface="catalog"] .empty p {
  color: #718091;
}

body[data-surface="catalog"] .primary {
  color: #fff;
  background: var(--catalog-blue);
  border: 0;
  border-radius: 999px;
  box-shadow: 0 8px 18px rgba(0, 122, 255, 0.22);
}

body[data-surface="catalog"] .primary:hover {
  background: var(--catalog-blue-dark);
}

body[data-surface="catalog"] .scope {
  color: #8793a0;
  border-color: rgba(17, 46, 72, 0.1);
}

body[data-surface="catalog"] .scope a {
  color: var(--catalog-blue-dark);
}

body[data-surface="catalog"] .notice {
  bottom: 24px;
  padding: 12px 18px;
  color: #fff;
  background: rgba(18, 25, 34, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 14px;
  box-shadow: 0 18px 48px rgba(16, 27, 39, 0.26);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
}

/* Progressive card entrance. Content remains visible when JS is unavailable. */
body[data-surface="catalog"].catalog-motion-ready .card[data-reveal="pending"] {
  opacity: 0;
  transform: translateY(18px) scale(0.985);
}

body[data-surface="catalog"].catalog-motion-ready .card[data-reveal="visible"] {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition: opacity 480ms ease, transform 600ms cubic-bezier(0.22, 1, 0.36, 1), border-color 260ms ease, box-shadow 420ms cubic-bezier(0.22, 1, 0.36, 1);
}

@media (min-width: 1700px) {
  body[data-surface="catalog"] .workspace {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  body[data-surface="catalog"] .main {
    padding-inline: 58px;
  }

  body[data-surface="catalog"] .domain-hero,
  body[data-surface="catalog"] .featured-model {
    min-height: 330px;
  }

  body[data-surface="catalog"] .featured-preview {
    min-height: 272px;
  }

  body[data-surface="catalog"] .cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 1220px) {
  body[data-surface="catalog"] .identity .university-mark {
    width: 205px;
  }

  body[data-surface="catalog"] .identity-course {
    padding-left: 16px;
  }

  body[data-surface="catalog"] .header-nav .home {
    padding-inline: 11px;
    font-size: 11px;
  }

  body[data-surface="catalog"] .workspace {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  body[data-surface="catalog"] .main {
    padding-inline: 24px;
  }

  body[data-surface="catalog"] .domain-hero {
    min-height: 264px;
    grid-template-columns: minmax(260px, 0.9fr) minmax(360px, 1.1fr);
  }

  body[data-surface="catalog"] .hero-copy {
    padding: 29px 24px;
  }

  body[data-surface="catalog"] .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  body[data-surface="catalog"] .masthead {
    height: 76px;
  }

  body[data-surface="catalog"] .identity .university-mark {
    width: 190px;
    height: 44px;
  }

  body[data-surface="catalog"] .identity-course {
    display: none;
  }

  body[data-surface="catalog"] .header-nav .home:nth-child(-n + 2) {
    display: none;
  }

  body[data-surface="catalog"] .sidebar {
    top: 76px;
  }

  body[data-surface="catalog"] .domain-hero {
    grid-template-columns: 1fr 1fr;
  }

  body[data-surface="catalog"] .hero-copy {
    padding: 25px 21px;
  }

  body[data-surface="catalog"] .section-intro h1 {
    font-size: 29px;
  }
}

@media (max-width: 760px) {
  body[data-surface="catalog"] {
    background: linear-gradient(180deg, #fbfcfd 0, #f3f6f9 100%);
  }

  body[data-surface="catalog"]::before {
    display: none;
  }

  body[data-surface="catalog"] .masthead {
    height: 68px;
    padding: 0 14px;
  }

  body[data-surface="catalog"] .identity .university-mark {
    width: 166px;
    height: 37px;
  }

  body[data-surface="catalog"] .header-nav {
    display: none;
  }

  body[data-surface="catalog"] .workspace {
    display: block;
  }

  body[data-surface="catalog"] .sidebar {
    position: sticky;
    top: 68px;
    z-index: 22;
    min-height: 0;
    max-height: none;
    padding: 7px 12px;
    background: rgba(248, 250, 252, 0.84);
    border-right: 0;
    border-bottom: 1px solid rgba(17, 47, 73, 0.08);
    box-shadow: 0 6px 20px rgba(21, 43, 63, 0.04);
  }

  body[data-surface="catalog"] #domains {
    gap: 6px;
    padding: 2px 1px 5px;
    scrollbar-width: none;
  }

  body[data-surface="catalog"] #domains::-webkit-scrollbar {
    display: none;
  }

  body[data-surface="catalog"] .domain {
    min-height: 36px;
    padding: 7px 11px;
    border-radius: 999px;
  }

  body[data-surface="catalog"] .domain[aria-pressed="true"] {
    border-left: 1px solid rgba(0, 122, 255, 0.18);
    box-shadow: 0 3px 12px rgba(27, 57, 83, 0.08);
  }

  body[data-surface="catalog"] .main {
    padding: 14px 15px 34px;
  }

  body[data-surface="catalog"] .breadcrumbs {
    margin-bottom: 9px;
    font-size: 9px;
  }

  body[data-surface="catalog"] .domain-hero {
    min-height: 0;
    grid-template-columns: 1fr;
    margin-bottom: 23px;
    border-radius: 22px;
  }

  body[data-surface="catalog"] .hero-copy {
    padding: 24px 21px 18px;
  }

  body[data-surface="catalog"] .hero-kicker {
    margin-bottom: 11px;
  }

  body[data-surface="catalog"] .section-intro {
    margin-bottom: 15px;
  }

  body[data-surface="catalog"] .section-intro h1 {
    margin-bottom: 8px;
    font-size: 29px;
  }

  body[data-surface="catalog"] .section-intro p {
    font-size: 11px;
  }

  body[data-surface="catalog"] .featured-model {
    min-height: 244px;
    border-left: 0;
    border-top: 1px solid rgba(16, 39, 59, 0.08);
  }

  body[data-surface="catalog"] .featured-preview {
    min-height: 190px;
  }

  body[data-surface="catalog"] .featured-caption {
    left: 13px;
    right: 13px;
    padding: 10px 11px;
  }

  body[data-surface="catalog"] .catalog-utilities {
    align-items: flex-start;
  }

  body[data-surface="catalog"] .toolbar {
    top: 130px;
    gap: 6px !important;
    padding: 6px;
    border-radius: 15px;
  }

  body[data-surface="catalog"] .search-wrap {
    flex-basis: 100%;
    min-height: 43px;
  }

  body[data-surface="catalog"] .advanced-filters summary,
  body[data-surface="catalog"] .saved-toggle {
    min-height: 39px;
    border-radius: 11px;
  }

  body[data-surface="catalog"] .advanced-popover {
    right: -46px;
    width: min(270px, calc(100vw - 32px));
  }

  body[data-surface="catalog"] .cards {
    gap: 12px;
  }

  body[data-surface="catalog"] .card {
    border-radius: 17px;
  }

  body[data-surface="catalog"] .card:hover,
  body[data-surface="catalog"] .card:focus-within {
    transform: translateY(-2px);
  }

  body[data-surface="catalog"] .card-copy {
    padding: 14px 14px 2px;
  }

  body[data-surface="catalog"] .card h2 {
    font-size: 15px;
  }

  body[data-surface="catalog"] .model-actions {
    margin: 0 9px 9px;
  }

  body[data-surface="catalog"] .scope {
    margin-top: 24px;
  }
}

@media (max-width: 500px) {
  body[data-surface="catalog"] .identity .university-mark {
    width: 148px;
  }

  body[data-surface="catalog"] .cards {
    grid-template-columns: 1fr;
  }

  body[data-surface="catalog"] .card-visual {
    aspect-ratio: 16 / 9.7;
  }

  body[data-surface="catalog"] .card h2 {
    font-size: 17px;
  }

  body[data-surface="catalog"] .model-actions .mode-link {
    min-height: 38px;
    font-size: 11px;
  }
}

@media (hover: none) {
  body[data-surface="catalog"] .card:hover,
  body[data-surface="catalog"] .card:focus-within,
  body[data-surface="catalog"] .domain:hover,
  body[data-surface="catalog"] .mode-link:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  body[data-surface="catalog"] *,
  body[data-surface="catalog"] *::before,
  body[data-surface="catalog"] *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition-duration: 0.001ms !important;
  }

  body[data-surface="catalog"].catalog-motion-ready .card[data-reveal] {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-contrast: more) {
  body[data-surface="catalog"] {
    --catalog-line: rgba(12, 34, 54, 0.25);
  }

  body[data-surface="catalog"] :is(.card, .domain-hero, .toolbar, .advanced-popover) {
    border-color: rgba(9, 31, 51, 0.26);
  }
}