/* =================================================================
   SERIOUSLY SCIENTIFIC - EPISODE CATALOGUE (TV GUIDE)
   catalog.css v1.0.3
   Loaded only on page-catalog.php via functions.php enqueue.
   Owns ALL appearance for the catalogue page. The template file
   handles structure only.
   Layout: sticky vertical channel rail (left) + programme grid.
   Periodic-table layer: topic groups rendered as element tiles,
   used for both the filter legend and the per-card topic chips.
   ================================================================= */

/* --- Topic group colour tokens (scoped to the catalogue) --- */
.ss-catalog {
    --cat-life: #7CB56B;
    --cat-physical: #4A9FD4;
    --cat-earth: #C98A3D;
    --cat-space: #9B84E8;
    --cat-environ: #5FB8A5;
    --cat-general: #A79A8F;
    --cat-rail-w: 200px;
    --cat-header-offset: 8.5rem; /* sticky site header (7rem) + breathing room */
}

.ss-catalog {
    max-width: var(--site-w, 1400px);
    box-sizing: border-box; /* padding counts inside the 1400, matching .header-container-new and .rf-footer-grid exactly */
    margin: 0 auto;
    padding: 2rem 2rem 4rem;
    font-family: 'Inter', sans-serif;
    color: var(--starlight);
}

/* =================================================================
   PAGE HEADER
   ================================================================= */
.cat-header {
    margin-bottom: 1.5rem;
}

.cat-kicker {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.cat-kicker-label {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--supernova-orange);
    white-space: nowrap;
}

.cat-kicker-line {
    height: 1px;
    flex: 1;
    background: linear-gradient(90deg, var(--martian-soil), transparent);
}

.cat-title-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.cat-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--starlight);
    margin: 0;
    line-height: 1.1;
}

.cat-count-readout {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--starlight-muted);
    background: var(--lunar-rock);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    padding: 0.45rem 0.9rem;
    white-space: nowrap;
}

.cat-count-readout strong {
    color: var(--amber);
    font-weight: 700;
}

.cat-intro {
    font-size: 0.95rem;
    color: rgba(247, 250, 252, 0.6);
    line-height: 1.6;
    max-width: 760px;
    margin: 0.75rem 0 0;
}

/* =================================================================
   FILTER LEGEND (periodic-table element tiles)
   ================================================================= */
.cat-filters {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.5rem;
    margin: 1.5rem 0 2rem;
}

.cat-tile {
    --tile-accent: var(--starlight-muted);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--lunar-rock);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 0.45rem 0.8rem 0.45rem 0.45rem;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    color: var(--starlight-muted);
    transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
    text-align: left;
}

.cat-tile:hover {
    border-color: var(--tile-accent);
    transform: translateY(-2px);
}

.cat-tile:focus-visible {
    outline: 2px solid var(--highlight-yellow);
    outline-offset: 2px;
}

.cat-tile-symbol {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    border: 1.5px solid var(--tile-accent);
    border-radius: 6px;
    background: rgba(26, 12, 8, 0.6);
    flex-shrink: 0;
}

.cat-tile-symbol .sym {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1;
    color: var(--tile-accent);
}

.cat-tile-symbol .num {
    font-size: 0.5rem;
    font-weight: 600;
    line-height: 1;
    margin-top: 2px;
    color: var(--tile-accent);
    opacity: 0.75;
}

.cat-tile-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.cat-tile-name {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--starlight);
}

.cat-tile-count {
    font-size: 0.62rem;
    color: var(--starlight-muted);
    opacity: 0.7;
}

/* Active tile state */
.cat-tile.is-active {
    background: rgba(26, 12, 8, 0.9);
    border-color: var(--tile-accent);
    box-shadow: inset 0 0 0 1px var(--tile-accent);
}

.cat-tile.is-active .cat-tile-name {
    color: var(--tile-accent);
}

/* Topic colour hooks */
.cat-tile[data-topic="all"]      { --tile-accent: var(--supernova-orange-light); }
.cat-tile[data-topic="life"]     { --tile-accent: var(--cat-life); }
.cat-tile[data-topic="physical"] { --tile-accent: var(--cat-physical); }
.cat-tile[data-topic="earth"]    { --tile-accent: var(--cat-earth); }
.cat-tile[data-topic="space"]    { --tile-accent: var(--cat-space); }
.cat-tile[data-topic="environ"]  { --tile-accent: var(--cat-environ); }
.cat-tile[data-topic="general"]  { --tile-accent: var(--cat-general); }

/* Interactive-only toggle: amber, matches in-lesson interactable colour language */
.cat-tile.cat-tile-interactive { --tile-accent: var(--amber); }

.cat-tile.cat-tile-interactive .cat-tile-symbol {
    border-style: dashed;
}

/* =================================================================
   TWO-COLUMN GUIDE LAYOUT
   ================================================================= */
.cat-guide {
    display: grid;
    grid-template-columns: var(--cat-rail-w) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
}

/* --- Channel rail --- */
.cat-rail {
    position: sticky;
    top: var(--cat-header-offset);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.cat-rail-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: rgba(247, 250, 252, 0.4);
    padding: 0 0.75rem 0.25rem;
}

.cat-rail-item {
    display: block;
    background: rgba(61, 35, 24, 0.45);
    border-left: 3px solid var(--martian-soil);
    border-radius: 0 6px 6px 0;
    padding: 0.55rem 0.75rem;
    text-decoration: none;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.cat-rail-item:hover {
    background: var(--lunar-rock);
    border-left-color: var(--supernova-orange-light);
}

.cat-rail-item.is-current {
    background: var(--lunar-rock);
    border-left-color: var(--supernova-orange);
}

.cat-rail-item.is-empty {
    opacity: 0.35;
    pointer-events: none;
}

.cat-rail-ch {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.58rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--amber);
    margin-bottom: 0.1rem;
}

.cat-rail-name {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--starlight);
    line-height: 1.2;
}

.cat-rail-item.is-current .cat-rail-name {
    color: var(--supernova-orange-light);
}

.cat-rail-count {
    display: block;
    font-size: 0.62rem;
    color: rgba(247, 250, 252, 0.45);
    margin-top: 0.15rem;
}

/* =================================================================
   CHANNEL SECTIONS + PROGRAMME GRID
   ================================================================= */
.cat-channel {
    margin-bottom: 2.5rem;
    scroll-margin-top: var(--cat-header-offset);
}

.cat-channel-header {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 1rem;
}

.cat-channel-badge {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--deep-space);
    background: var(--supernova-orange);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    white-space: nowrap;
}

.cat-channel-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--starlight);
    margin: 0;
    white-space: nowrap;
}

.cat-channel-name a {
    color: inherit;
    text-decoration: none;
}

.cat-channel-name a:hover {
    color: var(--nebula-turquoise);
}

.cat-channel-sub {
    font-size: 0.7rem;
    color: rgba(247, 250, 252, 0.4);
    white-space: nowrap;
}

.cat-channel-line {
    height: 1px;
    flex: 1;
    background: linear-gradient(90deg, var(--martian-soil), transparent);
}

.cat-channel-hublink {
    font-family: 'Inter', sans-serif;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--nebula-turquoise);
    text-decoration: none;
    white-space: nowrap;
}

.cat-channel-hublink:hover {
    color: var(--starlight);
}

.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

/* --- Episode card --- */
.cat-card {
    --card-accent: var(--cat-general);
    background: var(--lunar-rock);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    overflow: hidden;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.cat-card:hover {
    transform: translateY(-4px);
    border-color: var(--card-accent);
}

.cat-card[data-topic="life"]     { --card-accent: var(--cat-life); }
.cat-card[data-topic="physical"] { --card-accent: var(--cat-physical); }
.cat-card[data-topic="earth"]    { --card-accent: var(--cat-earth); }
.cat-card[data-topic="space"]    { --card-accent: var(--cat-space); }
.cat-card[data-topic="environ"]  { --card-accent: var(--cat-environ); }
.cat-card[data-topic="general"]  { --card-accent: var(--cat-general); }

.cat-card a {
    display: block;
    text-decoration: none;
    color: inherit;
}

.cat-card-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--deep-space);
    overflow: hidden;
}

.cat-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.cat-card:hover .cat-card-thumb img {
    transform: scale(1.05);
}

.cat-card-epnum {
    position: absolute;
    bottom: 0.4rem;
    left: 0.4rem;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--starlight);
    background: rgba(26, 12, 8, 0.85);
    border-radius: 4px;
    padding: 0.2rem 0.45rem;
}

.cat-card-lesson {
    position: absolute;
    top: 0.4rem;
    right: 0.4rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.58rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--deep-space);
    background: var(--amber);
    border-radius: 4px;
    padding: 0.25rem 0.45rem;
}

.cat-card-body {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.65rem 0.7rem;
}

/* Mini element tile on each card */
.cat-card-element {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 2.1rem;
    height: 2.1rem;
    border: 1.5px solid var(--card-accent);
    border-radius: 5px;
    background: rgba(26, 12, 8, 0.5);
    flex-shrink: 0;
}

.cat-card-element .sym {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1;
    color: var(--card-accent);
}

.cat-card-element .num {
    font-size: 0.45rem;
    font-weight: 600;
    line-height: 1;
    margin-top: 2px;
    color: var(--card-accent);
    opacity: 0.75;
}

.cat-card-text {
    min-width: 0;
}

.cat-card-topic {
    display: block;
    font-size: 0.58rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--card-accent);
    margin-bottom: 0.15rem;
}

.cat-card-title {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--starlight);
    line-height: 1.25;
    margin: 0;
}

/* --- Filtered state --- */
.cat-card.cat-hide {
    display: none;
}

.cat-channel.cat-channel-empty .cat-grid {
    display: none;
}

.cat-channel-nomatch {
    display: none;
    font-size: 0.8rem;
    color: rgba(247, 250, 252, 0.4);
    background: rgba(61, 35, 24, 0.35);
    border: 1px dashed var(--martian-soil);
    border-radius: 8px;
    padding: 0.9rem 1rem;
}

.cat-channel.cat-channel-empty .cat-channel-nomatch {
    display: block;
}

/* =================================================================
   RESPONSIVE
   ================================================================= */
@media (max-width: 900px) {
    .ss-catalog {
        padding: 1.25rem 1rem 3rem;
    }

    .cat-guide {
        grid-template-columns: 1fr;
    }

    /* Rail becomes a horizontal channel strip under the filters */
    .cat-rail {
        position: sticky;
        top: 7rem;
        z-index: 50;
        flex-direction: row;
        gap: 0.4rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        background: rgba(26, 12, 8, 0.95);
        padding: 0.5rem 0.25rem;
        margin: 0 -0.25rem;
        scrollbar-width: none;
    }

    .cat-rail::-webkit-scrollbar {
        display: none;
    }

    .cat-rail-title {
        display: none;
    }

    .cat-rail-item {
        flex-shrink: 0;
        border-left: none;
        border-bottom: 3px solid var(--martian-soil);
        border-radius: 6px 6px 0 0;
        padding: 0.4rem 0.7rem;
    }

    .cat-rail-item.is-current {
        border-bottom-color: var(--supernova-orange);
    }

    .cat-rail-count {
        display: none;
    }

    .cat-title {
        font-size: 1.6rem;
    }

    .cat-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 0.75rem;
    }

    .cat-channel {
        scroll-margin-top: 11rem;
    }

    .cat-channel-sub,
    .cat-channel-hublink {
        display: none;
    }
}

@media (max-width: 480px) {
    .cat-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem;
    }

    .cat-tile-count {
        display: none;
    }

    .cat-card-body {
        gap: 0.45rem;
        padding: 0.55rem 0.55rem;
    }

    .cat-card-title {
        font-size: 0.75rem;
    }
}

/* Respect reduced-motion preferences */
@media (prefers-reduced-motion: reduce) {
    .cat-tile,
    .cat-card,
    .cat-card-thumb img {
        transition: none;
    }
}