:root {
    --navy-dark: #001525;
    --navy-mid: #052035;
    --dark-blue: #042833;
    --surge-green: #cce50c;
    --teal: #63d6d6;
    --orange: #ff4433;
    --white: #ffffff;
    --light-grey: #e9f2f2;
    --text-muted: rgba(255,255,255,0.45);
    --text-dim: rgba(255,255,255,0.22);
    --border-hairline: rgba(255,255,255,0.08);
  }

  * { box-sizing: border-box; }

  a { text-decoration: none; color: inherit; }

  body {
    margin: 0;
    background: var(--navy-dark);
    color: var(--white);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
  }

  h1, h2, .display {
    font-family: 'Ramabhadra', sans-serif;
    font-weight: 400;
    letter-spacing: 0.01em;
  }

  .mono {
    font-family: 'Share Tech Mono', monospace;
  }

  .icon {
    width: 15px;
    height: 15px;
    display: inline-block;
    flex-shrink: 0;
    color: inherit;
    vertical-align: -3px;
  }

  /* ---------- TOP BAR ---------- */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 40px;
    background: var(--navy-dark);
    border-bottom: 1px solid var(--border-hairline);
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Ramabhadra', sans-serif;
    font-size: 19px;
    color: var(--white);
  }

  .brand .mark {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--surge-green), var(--teal));
    display: inline-block;
  }

  /* ---------- CATALOG HEADER (centered, simplified) ---------- */
  .catalog-header {
    text-align: center;
    padding: 40px 40px 28px;
  }

  .eyebrow {
    color: var(--surge-green);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin: 0 0 10px;
  }

  .catalog-header h1 {
    font-size: 32px;
    margin: 0;
    color: var(--white);
  }

  /* ---------- CONTENT TYPE PILLS (primary filter) ---------- */
  .typebar-section {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 40px 0;
  }

  .typebar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .type-pill {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 12px 22px;
    border-radius: 10px;
    border: 1px solid var(--border-hairline);
    background: var(--navy-mid);
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
    /* button reset */
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    line-height: 1;
    -webkit-appearance: none;
    appearance: none;
    text-align: left;
  }

  .type-pill:hover { border-color: var(--teal); }

  .type-pill.active {
    border-color: var(--surge-green);
    background: rgba(204,229,12,0.08);
  }

  .type-pill .icon {
    font-size: 17px;
    color: var(--teal);
    transition: filter 0.15s ease, color 0.15s ease;
    filter: drop-shadow(0 0 0 transparent);
  }

  .type-pill:hover .icon {
    filter: drop-shadow(0 0 5px currentColor);
  }

  .type-pill.active .icon { color: var(--surge-green); }

  .type-pill .label {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
  }

  .type-pill .count {
    font-family: 'Share Tech Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 2px;
  }

  /* ---------- SEARCH SECTION (prominent, centered) ---------- */
  .search-section {
    max-width: 1320px;
    margin: 0 auto;
    padding: 20px 40px 4px;
    display: flex;
    justify-content: center;
  }

  .searchwrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--navy-mid);
    border: 1px solid var(--border-hairline);
    border-radius: 10px;
    padding: 0 18px;
    width: 100%;
    max-width: 560px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
  }

  .searchwrap:focus-within {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(99, 214, 214, 0.12);
  }

  .searchwrap .search-icon {
    color: var(--text-muted);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
  }

  .searchwrap input {
    background: transparent;
    border: none;
    padding: 14px 0;
    color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    width: 100%;
    outline: none;
  }

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

  /* ---------- SECONDARY FILTER ROW (dropdowns, subdued) ---------- */
  .filters {
    max-width: 1320px;
    margin: 0 auto;
    padding: 10px 40px 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    position: relative;
  }

  .dropdown {
    position: relative;
  }

  .dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-hairline);
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
  }

  .dropdown-trigger:hover { border-color: var(--teal); color: var(--white); }
  .dropdown-trigger.has-selection { border-color: var(--teal); color: var(--white); }

  .dropdown-trigger .icon {
    transition: filter 0.15s ease;
    filter: drop-shadow(0 0 0 transparent);
  }

  .dropdown-trigger:hover .icon {
    filter: drop-shadow(0 0 4px var(--teal));
  }

  .dropdown-trigger .sel-count {
    background: var(--teal);
    color: var(--navy-dark);
    font-family: 'Share Tech Mono', monospace;
    font-size: 10px;
    border-radius: 100px;
    padding: 1px 6px;
    font-weight: 700;
  }

  .dropdown-panel {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 220px;
    background: var(--dark-blue);
    border: 1px solid var(--border-hairline);
    border-radius: 10px;
    padding: 8px;
    z-index: 30;
    box-shadow: 0 12px 28px rgba(0,0,0,0.45);
  }

  .dropdown-panel.hidden { display: none; }

  .check-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 8px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--white);
  }

  .check-row:hover { background: rgba(255,255,255,0.05); }

  .check-row input[type="checkbox"] {
    width: 15px;
    height: 15px;
    accent-color: var(--surge-green);
    cursor: pointer;
  }

  .clear-link {
    font-size: 12px;
    color: var(--text-muted);
    cursor: pointer;
    text-decoration: underline;
    text-decoration-color: var(--border-hairline);
  }

  .clear-link:hover { color: var(--teal); }

  /* ---------- GRID ---------- */
  .grid-section {
    max-width: 1320px;
    margin: 0 auto;
    padding: 20px 40px 80px;
  }

  .result-count {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0 0 16px;
  }

  .result-count .mono { color: var(--teal); }

  .grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }

  /* ---------- CARDS (Variant C: green outline + glow hover) ---------- */
  .card {
    background: var(--navy-mid);
    border: 1.5px solid var(--surge-green);
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  }

  .card:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 0 1px var(--surge-green), 0 0 22px rgba(204,229,12,0.28);
  }

  /* Type-specific hover accent overrides */
  .card.type-arcade {
    border-color: var(--teal);
  }
  .card.type-arcade:hover {
    box-shadow: 0 0 0 1px var(--teal), 0 0 22px rgba(99,214,214,0.28);
  }

  .card.type-explainer {
    border-color: #b39ce6;
  }
  .card.type-explainer:hover {
    box-shadow: 0 0 0 1px #b39ce6, 0 0 22px rgba(179,156,230,0.28);
  }

  .card.type-exam {
    border-color: #f2b84a;
  }
  .card.type-exam:hover {
    box-shadow: 0 0 0 1px #f2b84a, 0 0 22px rgba(242,184,74,0.28);
  }

  .card.type-video {
    border-color: var(--orange);
  }
  .card.type-video:hover {
    box-shadow: 0 0 0 1px var(--orange), 0 0 22px rgba(255,68,51,0.28);
  }

  /* ---------- CARD TYPE BAR ---------- */
  .card-type {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 11px;
    background: var(--surge-green);
  }

  .card-type .icon {
    font-size: 13px;
    color: var(--navy-dark);
  }

  .card-type .type-label {
    font-family: 'Share Tech Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.07em;
    color: var(--navy-dark);
    font-weight: 700;
  }

  /* Arcade: teal bar */
  .card.type-arcade .card-type {
    background: var(--teal);
  }

  /* Explainer: purple bar */
  .card.type-explainer .card-type {
    background: #b39ce6;
  }

  /* Exam: amber bar */
  .card.type-exam .card-type {
    background: #f2b84a;
  }

  /* Lesson: orange bar */
  .card.type-video .card-type {
    background: var(--orange);
  }

  /* ---------- CARD THUMBNAIL ---------- */
  .card-thumb {
    aspect-ratio: 16 / 9;
    background: var(--dark-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }

  .card-thumb svg { width: 38px; height: 38px; }

  /* ---------- CARD BODY ---------- */
  .card-body {
    padding: 11px 12px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  .card-body h3 {
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    margin: 0 0 5px;
    color: var(--white);
    line-height: 1.3;
  }

  .card-body p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.45;
    margin: 0;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .card-tags {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
    padding-top: 9px;
    border-top: 1px solid var(--border-hairline);
  }

  .tag {
    font-family: 'Share Tech Mono', monospace;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    line-height: 1.5;
  }

  .tag.ladder-compute { background: rgba(99,214,214,0.14); color: var(--teal); }
  .tag.ladder-network { background: rgba(159,214,74,0.14); color: #9fd64a; }
  .tag.ladder-security { background: rgba(255,68,51,0.14); color: var(--orange); }

  .tag.access-free { background: rgba(255,255,255,0.07); color: var(--text-muted); }
  .tag.access-signup { background: rgba(255,255,255,0.07); color: var(--text-muted); }
  .tag.access-member { background: rgba(255,68,51,0.14); color: var(--orange); }

  .tag.cert { background: rgba(255,255,255,0.05); color: var(--text-dim); margin-left: auto; }

  .card.locked { opacity: 0.6; }
  .card.locked .card-thumb { opacity: 0.5; }
  .card.locked h3 { color: var(--text-muted); }
  .card.locked:hover { transform: none; box-shadow: none; }

  @media (max-width: 1180px) {
    .grid { grid-template-columns: repeat(4, 1fr); }
  }
  @media (max-width: 900px) {
    .grid { grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 600px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
    .topbar, .catalog-header, .typebar-section, .search-section, .filters, .grid-section { padding-left: 20px; padding-right: 20px; }
    .topbar { flex-wrap: wrap; }
    .searchwrap { max-width: 100%; }
  }