/* ==========================================================================
   Merit Study Resources — subjects page
   Loaded after style.css and resources.css; reuses their tokens and shell.
   ========================================================================== */

/* 1. Page header controls ----------------------------------------------- */
.subjects-header {
    padding-bottom: 1.5rem;
}

.subject-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.subject-search {
    flex: 1 1 22rem;
    max-width: 26rem;
}

.qual-filter {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    padding: .3rem;
    background: #f4f7f5;
    border: 1px solid var(--merit-line);
    border-radius: var(--radius-pill);
}

.result-count {
    margin: 1rem 0 0;
    font-size: .87rem;
    color: var(--merit-muted);
}

/* 2. Category jump bar --------------------------------------------------- */
.jump-bar {
    position: sticky;
    top: 0;
    z-index: 1020;
    background: rgba(255, 255, 255, .96);
    backdrop-filter: saturate(140%) blur(6px);
    border-bottom: 1px solid var(--card-border);
}

.jump-list {
    display: flex;
    gap: .4rem;
    margin: 0;
    padding: .65rem 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.jump-list::-webkit-scrollbar {
    display: none;
}

.jump-chip {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .4rem .85rem;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-pill);
    background: #fff;
    color: var(--merit-text);
    font-size: .85rem;
    font-weight: 600;
    white-space: nowrap;
    transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.jump-chip:hover {
    background: var(--merit-light-green);
    border-color: #cfe5d8;
    color: var(--merit-dark-green);
    text-decoration: none;
}

.jump-count {
    font-size: .75rem;
    font-weight: 500;
    color: var(--merit-muted);
}

/* 3. Subject groups ------------------------------------------------------ */
.subject-body {
    padding: 2rem 0 3rem;
}

.subject-group {
    scroll-margin-top: 4.5rem;
}

.subject-group+.subject-group {
    margin-top: 2.5rem;
}

.subject-group[hidden] {
    display: none;
}

.group-head {
    display: flex;
    align-items: baseline;
    gap: .85rem;
    padding-bottom: .75rem;
    margin-bottom: 1.1rem;
    border-bottom: 1px solid var(--card-border);
}

.group-heading {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -.02em;
    margin: 0;
}

.group-count {
    font-size: .82rem;
    color: var(--merit-muted);
}

/* 4. Subject tiles ------------------------------------------------------- */
.subject-tile {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: .9rem;
    height: 100%;
    padding: 1.05rem 2.4rem 1.05rem 1.05rem;
    background: #fff;
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    color: var(--merit-navy);
    transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.subject-tile:hover,
.subject-tile:focus-visible {
    transform: translateY(-2px);
    border-color: #cfdcd4;
    box-shadow: var(--shadow-sm);
    color: var(--merit-navy);
    text-decoration: none;
}

.subject-tile[hidden] {
    display: none;
}

.tile-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    flex: none;
    border-radius: 11px;
    font-size: 1.25rem;
    transition: transform var(--ease);
}

.subject-tile:hover .tile-icon {
    transform: scale(1.06);
}

.tile-icon.tint-mint {
    color: var(--ink-teal);
}

.tile-icon.tint-blush {
    color: var(--ink-rose);
}

.tile-icon.tint-sage {
    color: var(--merit-green);
}

.tile-icon.tint-cream {
    color: var(--ink-amber);
}

.tile-icon.tint-sky {
    color: var(--ink-blue);
}

.tile-icon.tint-lilac {
    color: var(--ink-purple);
}

.tile-icon.tint-periwinkle {
    color: var(--merit-navy);
}

.tile-body {
    display: block;
    min-width: 0;
}

.tile-name {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -.015em;
    margin-bottom: .15rem;
}

.tile-meta {
    display: block;
    font-size: .8rem;
    color: var(--merit-muted);
    margin-bottom: .55rem;
}

.tile-quals {
    display: flex;
    flex-wrap: wrap;
    gap: .3rem;
}

.qual-chip {
    display: inline-block;
    padding: .12rem .5rem;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-pill);
    background: #fbfdfb;
    font-size: .72rem;
    font-weight: 600;
    color: var(--merit-muted);
}

.tile-go {
    position: absolute;
    right: 1rem;
    top: 1.15rem;
    color: var(--merit-green);
    font-size: .85rem;
    transition: transform var(--ease);
}

/* 5. Request panel ------------------------------------------------------- */
.request-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: var(--merit-light-green);
    border: 1px solid #d9e9df;
    border-radius: var(--radius-lg);
}

.request-heading {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 .3rem;
}

.request-text {
    margin: 0;
    font-size: .92rem;
    color: #4a5f70;
    max-width: 40rem;
}

.request-panel .btn-merit {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-height: 46px;
    padding-inline: 1.4rem;
}

/* 6. Responsive ---------------------------------------------------------- */
@media (max-width: 991.98px) {
    .jump-bar {
        position: static;
    }

    .subject-group {
        scroll-margin-top: 1rem;
    }
}

@media (max-width: 767.98px) {
    .subject-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .subject-search {
        max-width: none;
    }

    .qual-filter {
        justify-content: space-between;
    }

    .qual-filter .filter-pill {
        flex: 1 1 auto;
    }

    .request-panel {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 575.98px) {
    .tile-meta {
        display: none;
    }

    .subject-tile {
        padding-right: 2.2rem;
    }
}