/* ============================================================
   NVIDIA Game Dev Toolkit — Styles
   Dark-first NVIDIA-inspired theme
   ============================================================ */

/* ---------- Custom Properties ---------- */
:root {
  --green: #76b900;
  --green-dim: #5a9000;
  --green-bright: #8fd400;
  --green-glow: rgba(118, 185, 0, 0.15);
  --green-glow-strong: rgba(118, 185, 0, 0.3);

  /* Category Colors */
  --cat-rendering: #4fc3f7;
  --cat-ai: #ba68c8;
  --cat-physics: #ff8a65;
  --cat-audio: #f06292;
  --cat-asset: #aed581;
  --cat-testing: #ffd54f;
  --cat-cloud: #4dd0e1;
  --cat-devtools: #90a4ae;
  --cat-marketing: #ffab91;
  --cat-programs: #80cbc4;

  /* Pricing Colors */
  --price-free: #76b900;
  --price-freemium: #4fc3f7;
  --price-enterprise: #ffd54f;
  --price-paid: #ff8a65;

  /* Maturity Colors */
  --mat-stable: #76b900;
  --mat-beta: #ffd54f;
  --mat-early: #ff8a65;
  --mat-preview: #ba68c8;

  /* Quality Scale */
  --q-green: #76b900;
  --q-yellow: #ffd54f;
  --q-red: #ef5350;
  --q-gray: #555;

  /* Fonts */
  --font-body: 'General Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Cabinet Grotesk', 'General Sans', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --container: 1280px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transitions */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 0.3s;
}

/* ---------- Dark Theme (default) ---------- */
[data-theme="dark"] {
  --bg-primary: #0d0d1a;
  --bg-secondary: #111125;
  --bg-surface: #1a1a2e;
  --bg-card: #1e1e32;
  --bg-card-hover: #252540;
  --bg-input: #16162a;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
  --bg-primary: #f5f5f8;
  --bg-secondary: #eeeef2;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f8fc;
  --bg-input: #f0f0f4;
  --border: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(0, 0, 0, 0.2);
  --text-primary: #1a1a2e;
  --text-secondary: #555570;
  --text-muted: #8888a0;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  color-scheme: light;
}

/* ---------- What's New (Inline in Hero) ---------- */
.whats-new-inline {
  margin-bottom: 28px;
  max-width: 640px;
}

.whats-new-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 14px;
  background: rgba(118, 185, 0, 0.06);
  border: 1px solid rgba(118, 185, 0, 0.15);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-body);
  color: var(--text-secondary);
  gap: 10px;
  transition: border-color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.whats-new-toggle:hover {
  color: var(--text-primary);
  border-color: rgba(118, 185, 0, 0.3);
  background: rgba(118, 185, 0, 0.10);
}

.whats-new-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.wn-version-badge {
  display: inline-flex;
  align-items: center;
  background: var(--green);
  color: #0d0d1a;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.wn-summary {
  font-size: 0.82rem;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.wn-caret {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform var(--duration) var(--ease);
}

.whats-new-toggle[aria-expanded="true"] .wn-caret {
  transform: rotate(180deg);
}

.whats-new-panel {
  padding: 12px 14px 4px;
}

.whats-new-panel[hidden] {
  display: none;
}

/* Timeline entries */
.wn-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.wn-entry {
  display: grid;
  grid-template-columns: auto 20px 1fr;
  gap: 0 12px;
  align-items: start;
}

.wn-entry-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 4px;
  grid-column: 1;
}

.wn-entry-ver {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--green);
  white-space: nowrap;
}

.wn-entry-date {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

.wn-entry-dot-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  grid-column: 2;
  grid-row: 1 / 3;
  padding-top: 12px;
}

.wn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  box-shadow: 0 0 6px rgba(118, 185, 0, 0.4);
}

.wn-entry:not(:last-child) .wn-line {
  width: 1px;
  flex: 1;
  background: rgba(118, 185, 0, 0.2);
  min-height: 12px;
}

.wn-entry-changes {
  grid-column: 3;
  grid-row: 1 / 3;
  padding: 6px 0 14px;
}

.wn-entry-changes ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.wn-entry-changes li {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
}

.wn-entry-changes li::before {
  content: '\2022';
  position: absolute;
  left: 2px;
  color: var(--text-muted);
  opacity: 0.5;
}

.wn-entry:first-child .wn-entry-changes li {
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .wn-entry {
    grid-template-columns: auto 1fr;
    gap: 0 10px;
  }
  .wn-entry-dot-col { display: none; }
  .wn-entry-changes { grid-column: 2; grid-row: 2; }
  .wn-entry-header { grid-column: 1 / -1; }
  .wn-summary { display: none; }
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img { max-width: 100%; display: block; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-bright); }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 8px 16px;
  background: var(--green);
  color: #000;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
}
.skip-link:focus { top: 8px; }

/* Theme toggle icons (now in hub nav) */
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 56px 0 40px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(118, 185, 0, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(118, 185, 0, 0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 800px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.text-accent {
  color: var(--green);
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.hero-philosophy {
  font-size: 13px;
  color: var(--green);
  max-width: 640px;
  line-height: 1.6;
  font-style: italic;
  opacity: 0.85;
  margin-bottom: 24px;
}

.stats-bar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: fit-content;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--green);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* ---------- Sections ---------- */
.section {
  padding: 56px 0;
}

/* ---------- Why This Toolkit ---------- */
.why-content {
  max-width: 720px;
}

.why-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.why-content p:last-of-type:not(.why-attribution) {
  margin-bottom: 24px;
}

.why-content p:first-child {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.7;
}

.why-attribution {
  font-size: 13px !important;
  color: var(--text-muted) !important;
  font-style: italic;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  margin-bottom: 0 !important;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 640px;
  margin-bottom: 28px;
}

/* ---------- Where to Start ---------- */
.wts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}

.wts-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
}

.wts-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--green);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}

.wts-card:hover {
  border-color: var(--green);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.wts-card:hover::before {
  opacity: 1;
}

.wts-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.wts-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--green-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.wts-card-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
}

.wts-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.wts-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.wts-tool-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--green-glow);
  color: var(--green);
  white-space: nowrap;
}

/* ---------- Engine Matrix ---------- */
.matrix-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.engine-matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.engine-matrix thead {
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 2;
}

.engine-matrix th {
  padding: 10px 12px;
  font-weight: 600;
  text-align: center;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.matrix-tool-header {
  text-align: left !important;
  min-width: 200px;
  width: 40%;
}

.engine-matrix td {
  padding: 7px 12px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  vertical-align: middle;
}

.engine-matrix tbody tr {
  transition: background var(--duration) var(--ease);
}

.engine-matrix tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] .engine-matrix tbody tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

.engine-matrix tbody tr:hover {
  background: var(--bg-card-hover);
}

.engine-matrix td:first-child {
  text-align: left;
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-primary);
  line-height: 1.3;
}

.matrix-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  vertical-align: middle;
}

.matrix-dot-green { background: var(--q-green); box-shadow: 0 0 6px rgba(118, 185, 0, 0.4); }
.matrix-dot-yellow { background: var(--q-yellow); box-shadow: 0 0 6px rgba(255, 213, 79, 0.3); }
.matrix-dot-red { background: var(--q-red); box-shadow: 0 0 6px rgba(239, 83, 80, 0.3); }
.matrix-dot-gray { background: var(--border-hover); opacity: 0.4; }

.matrix-type {
  display: block;
  font-size: 9px;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.2;
}

/* ---------- Filter Bar ---------- */
.filter-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
  position: sticky;
  top: 48px;
  z-index: 50;
}

.search-wrapper {
  position: relative;
  margin-bottom: 16px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 10px 14px 10px 42px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  transition: border-color var(--duration) var(--ease);
  outline: none;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px var(--green-glow);
}

.filter-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.filter-group {
  position: relative;
}

.filter-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  white-space: nowrap;
}

.filter-toggle:hover,
.filter-toggle[aria-expanded="true"] {
  border-color: var(--green);
  color: var(--text-primary);
}

.filter-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.filter-toggle svg {
  transition: transform var(--duration) var(--ease);
}

.filter-toggle.has-active {
  background: var(--green-glow);
  border-color: var(--green);
  color: var(--green);
}

.filter-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 220px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px;
  box-shadow: var(--shadow);
  z-index: 60;
}

.filter-dropdown.open {
  display: block;
  animation: dropIn 0.2s var(--ease);
}

@keyframes dropIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.15s var(--ease);
  user-select: none;
}

.filter-option:hover {
  background: var(--green-glow);
  color: var(--text-primary);
}

.filter-option input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-hover);
  border-radius: 4px;
  flex-shrink: 0;
  position: relative;
  cursor: pointer;
  transition: all 0.15s var(--ease);
}

.filter-option input[type="checkbox"]:checked {
  background: var(--green);
  border-color: var(--green);
}

.filter-option input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 5px;
  width: 4px;
  height: 8px;
  border: solid #000;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.filter-option input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.filter-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-count {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.clear-filters {
  background: none;
  border: none;
  color: var(--green);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--duration) var(--ease);
}

.clear-filters:hover {
  background: var(--green-glow);
}

.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.active-filters:empty {
  display: none;
}

.active-filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  font-size: 12px;
  background: var(--green-glow);
  color: var(--green);
  border-radius: 100px;
  font-weight: 500;
}

.active-filter-tag button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  font-size: 14px;
  opacity: 0.7;
}

.active-filter-tag button:hover {
  opacity: 1;
}

/* ---------- Tool Cards ---------- */
.tools-grid {
  display: grid;
  gap: 12px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
}

.tool-card:hover {
  border-color: var(--border-hover);
}

.tool-card.expanded {
  border-color: var(--green);
  box-shadow: 0 0 0 1px var(--green), var(--shadow);
}

/* Collapsed Header */
.tool-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 16px 20px;
  cursor: pointer;
  gap: 16px;
}

.tool-header:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
  border-radius: var(--radius-lg);
}

.tool-header-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.tool-name-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tool-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tool-name-link {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color var(--duration) var(--ease);
}

.tool-name-link:hover {
  color: var(--green);
}

.link-out-icon {
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
  flex-shrink: 0;
}

.tool-name-link:hover .link-out-icon {
  opacity: 0.6;
}

.why-gamedev {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  font-size: 12.5px;
  color: var(--green);
  line-height: 1.5;
  margin-top: 6px;
  font-weight: 500;
  font-style: italic;
}

.why-icon {
  flex-shrink: 0;
  margin-top: 1px;
  opacity: 0.7;
}

.hidden-gem-star {
  color: #ffd54f;
  font-size: 14px;
  flex-shrink: 0;
}

.tool-desc-short {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.tool-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tool-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.badge-category {
  background: var(--cat-color, var(--green-glow));
  color: var(--cat-text, var(--green));
}

.badge-pricing { font-family: var(--font-mono); font-size: 10px; }
.badge-pricing.free { background: rgba(118, 185, 0, 0.15); color: var(--price-free); }
.badge-pricing.freemium { background: rgba(79, 195, 247, 0.15); color: var(--price-freemium); }
.badge-pricing.enterprise { background: rgba(255, 213, 79, 0.15); color: var(--price-enterprise); }
.badge-pricing.paid { background: rgba(255, 138, 101, 0.15); color: var(--price-paid); }

.badge-maturity { font-family: var(--font-mono); font-size: 10px; }
.badge-maturity.stable { background: rgba(118, 185, 0, 0.12); color: var(--mat-stable); }
.badge-maturity.beta { background: rgba(255, 213, 79, 0.12); color: var(--mat-beta); }
.badge-maturity.early-access { background: rgba(255, 138, 101, 0.12); color: var(--mat-early); }
.badge-maturity.preview { background: rgba(186, 104, 200, 0.12); color: var(--mat-preview); }

/* Engine icons */
.engine-icons {
  display: flex;
  gap: 4px;
}

.engine-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-muted);
  transition: all 0.15s var(--ease);
}

.engine-icon.supported {
  background: var(--green-glow);
  border-color: var(--green);
  color: var(--green);
}

.expand-arrow {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform var(--duration) var(--ease);
  flex-shrink: 0;
}

.tool-card.expanded .expand-arrow {
  transform: rotate(180deg);
}

/* Expanded Content */
.tool-details {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--border);
}

.tool-card.expanded .tool-details {
  display: block;
  animation: slideDown 0.3s var(--ease);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Detail Tabs */
.detail-tabs-container {
  padding-top: 12px;
}

.detail-tab-bar {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.detail-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.detail-tab-btn:hover {
  color: var(--text-primary);
  background: var(--green-glow);
  border-bottom-color: rgba(118, 185, 0, 0.3);
}

.detail-tab-btn.active {
  color: var(--green);
  border-bottom-color: var(--green);
}

.detail-tab-btn svg {
  opacity: 0.7;
}

.detail-tab-btn.active svg {
  opacity: 1;
}

.detail-tab-panel {
  display: none;
}

.detail-tab-panel.active {
  display: block;
  animation: fadeTab 0.2s var(--ease);
}

@keyframes fadeTab {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.detail-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

.detail-meta-item {
  min-width: 0;
}

/* Collapsible limitations */
.limitations-wrap {
  margin-top: 14px;
}

.limitations-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 0;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.limitations-toggle:hover {
  opacity: 1;
}

.limitations-toggle svg {
  flex-shrink: 0;
}

.limitations-chevron {
  transition: transform 0.2s ease;
}

.limitations-content {
  overflow: hidden;
  transition: max-height 0.25s ease, opacity 0.2s ease;
  max-height: 600px;
  opacity: 1;
}

.limitations-content.collapsed {
  max-height: 0;
  opacity: 0;
}

.limitations-list {
  list-style: none;
  padding: 8px 0 0 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.limitations-list li {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}

.limitations-list li::before {
  content: '\2022';
  position: absolute;
  left: 4px;
  color: var(--text-muted);
  opacity: 0.4;
}

/* Overview structured layout */
.overview-quick-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg-input);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.oq-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.oq-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}

.oq-value {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.oq-divider {
  width: 1px;
  height: 16px;
  background: var(--border);
}

.overview-lead {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 8px;
  font-weight: 500;
}

.overview-more-wrap {
  margin-bottom: 12px;
}

.overview-more-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.overview-more-text.collapsed {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s var(--ease), opacity 0.2s var(--ease);
}

.overview-more-text:not(.collapsed) {
  max-height: 600px;
  opacity: 1;
  transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease);
  padding-top: 4px;
}

.overview-toggle {
  background: none;
  border: none;
  color: var(--green);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 0;
  margin-top: 4px;
  transition: color var(--duration) var(--ease);
}

.overview-toggle:hover {
  color: var(--green-bright);
}

.detail-empty {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding-top: 16px;
}

.detail-section {
  margin-bottom: 16px;
}

.detail-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.detail-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.use-case-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 8px;
}

.use-case-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: border-color var(--duration) var(--ease);
}

.use-case-list li:hover {
  border-color: var(--green-glow-strong);
}

.uc-icon {
  flex-shrink: 0;
  color: var(--green);
  margin-top: 2px;
}

/* Phase pills */
.phase-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.phase-pill {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 500;
  background: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.phase-pill.active {
  background: var(--green-glow);
  color: var(--green);
  border-color: rgba(118, 185, 0, 0.3);
}

/* Team size pills */
.team-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.team-pill {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 500;
  background: var(--green-glow);
  color: var(--green);
}

/* Integration difficulty */
.difficulty-meter {
  display: flex;
  align-items: center;
  gap: 8px;
}

.difficulty-bars {
  display: flex;
  gap: 3px;
}

.difficulty-bar {
  width: 28px;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
}

.difficulty-bar.filled.easy { background: var(--q-green); }
.difficulty-bar.filled.moderate { background: var(--q-yellow); }
.difficulty-bar.filled.complex { background: var(--q-red); }

.difficulty-label {
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-mono);
}

.difficulty-label.easy { color: var(--q-green); }
.difficulty-label.moderate { color: var(--q-yellow); }
.difficulty-label.complex { color: var(--q-red); }

/* Engine Integration Tabs */
.engine-tabs {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 8px;
}

.engine-tab-bar {
  display: flex;
  background: var(--bg-input);
  border-bottom: 1px solid var(--border);
}

.engine-tab-btn {
  flex: 1;
  padding: 8px 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s var(--ease);
  border-bottom: 2px solid transparent;
}

.engine-tab-btn:hover {
  color: var(--text-primary);
  background: var(--green-glow);
}

.engine-tab-btn.active {
  color: var(--green);
  border-bottom-color: var(--green);
  background: var(--bg-card);
}

.engine-tab-content {
  display: none;
  padding: 16px;
}

.engine-tab-content.active {
  display: block;
  animation: fadeIn 0.2s var(--ease);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.integration-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

.integration-row:last-child {
  border-bottom: none;
}

.integration-key {
  color: var(--text-muted);
  font-weight: 500;
}

.integration-value {
  color: var(--text-primary);
  text-align: right;
  max-width: 60%;
}

.quality-dots {
  display: inline-flex;
  gap: 3px;
}

.quality-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.quality-dot.filled { background: var(--green); }
.quality-dot.filled-yellow { background: var(--q-yellow); }
.quality-dot.filled-red { background: var(--q-red); }



/* Links */
.tool-links {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  transition: all var(--duration) var(--ease);
}

.tool-link-primary {
  background: var(--green);
  color: #000;
}

.tool-link-primary:hover {
  background: var(--green-bright);
  color: #000;
}

.tool-link-secondary {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.tool-link-secondary:hover {
  border-color: var(--green);
  color: var(--green);
}

/* No Results */
.no-results {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.no-results svg {
  margin: 0 auto 16px;
  opacity: 0.4;
}

.no-results p {
  font-size: 15px;
  margin-bottom: 16px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
}

.btn-secondary:hover {
  border-color: var(--green);
  color: var(--green);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  text-align: center;
}

.footer-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.footer-attribution a {
  font-size: 12px;
  color: var(--text-muted);
  transition: color var(--duration) var(--ease);
}

.footer-attribution a:hover {
  color: var(--green);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .header-nav .nav-link {
    display: none;
  }

  .hero {
    padding: 60px 0 40px;
  }

  .stats-bar {
    flex-wrap: wrap;
    gap: 16px;
    width: 100%;
    justify-content: center;
  }

  .stat-divider {
    display: none;
  }

  .wts-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    position: static;
    padding: 16px;
  }

  .filter-groups {
    flex-direction: column;
    gap: 6px;
  }

  .filter-group {
    width: 100%;
  }

  .filter-toggle {
    width: 100%;
    justify-content: space-between;
  }

  .filter-dropdown {
    position: static;
    border: none;
    box-shadow: none;
    padding: 4px 0;
  }

  .detail-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .detail-meta-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .detail-tab-btn {
    padding: 8px 12px;
    font-size: 11.5px;
  }

  .tool-header {
    grid-template-columns: 1fr auto;
    padding: 14px 16px;
  }

  .tool-header-right {
    flex-direction: column;
    align-items: flex-end;
  }

  .tool-badges {
    justify-content: flex-end;
  }

  .engine-tab-bar {
    flex-wrap: wrap;
  }

  .engine-tab-btn {
    flex: 1 1 auto;
    min-width: 80px;
  }

  .tool-links {
    flex-direction: column;
  }

  .matrix-scroll {
    margin: 0 -24px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .section {
    padding: 40px 0;
  }

  .tool-name,
  .tool-name-link {
    font-size: 0.95rem;
  }
}

/* ---------- Focus styles ---------- */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ---------- Back to Top Button ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--green);
  color: #0d0d1a;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease), visibility 0.3s, transform 0.3s var(--ease), background 0.2s;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--green-bright);
  box-shadow: 0 4px 20px rgba(118, 185, 0, 0.35);
}

@media (max-width: 640px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 38px;
    height: 38px;
  }
}

/* ---------- Sort Dropdown ---------- */
.filter-meta-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sort-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sort-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.sort-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 28px 5px 10px;
  cursor: pointer;
  transition: border-color var(--duration) var(--ease);
  outline: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%236a6a80' stroke-width='2'%3E%3Cpath d='m2 4 4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.sort-select:hover,
.sort-select:focus {
  border-color: var(--green);
}

[data-theme="light"] .sort-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%238888a0' stroke-width='2'%3E%3Cpath d='m2 4 4 4 4-4'/%3E%3C/svg%3E");
}

/* ---------- Filter Option Counts ---------- */
.filter-option-count {
  margin-left: auto;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  opacity: 0.7;
  min-width: 20px;
  text-align: right;
}

/* ---------- WTS Active Card ---------- */
.wts-card.wts-active {
  border-color: var(--green);
  background: var(--bg-card-hover);
  box-shadow: 0 0 0 1px var(--green), var(--shadow);
}

.wts-card.wts-active::before {
  opacity: 1;
}