/* ============================================
   MOTi Lab — Research Archive page styles
   ============================================ */

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.archive-section { padding-top: 3rem; }

/* ----- Intro ----- */
.archive-intro {
    display: grid;
    grid-template-columns: minmax(180px, 220px) 1fr;
    gap: 2rem;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: #fff;
    padding: 2rem 2.25rem;
    border-radius: var(--border-radius);
    margin-bottom: 2.5rem;
}
.archive-stat {
    text-align: center;
    padding: 1.25rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}
.archive-stat-num {
    display: block;
    font-family: var(--font-display, inherit);
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    color: #fff;
}
.archive-stat-label {
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 0.4rem;
}
.archive-intro-text p { margin: 0 0 0.6rem; }
.archive-intro-text p:last-child { margin-bottom: 0; }
.archive-source {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    margin-top: 0.6rem;
}

/* ----- Controls ----- */
.archive-controls {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.25rem 1.5rem 1.5rem;
    box-shadow: var(--box-shadow);
    display: grid;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.archive-search {
    position: relative;
    display: flex;
    align-items: center;
}
.archive-search i {
    position: absolute;
    left: 1rem;
    color: var(--text-light);
    pointer-events: none;
}
.archive-search input {
    width: 100%;
    padding: 0.85rem 1rem 0.85rem 2.6rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-light);
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.archive-search input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(30, 41, 59, 0.12);
}

/* ----- Subject filters (primary categorization) ----- */
.subject-filter-block {
    border-top: 1px dashed var(--border-color);
    padding-top: 1.1rem;
    margin-top: 0.25rem;
}
.subject-filter-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
}
.subject-filter-label {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--font-display, inherit);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--primary-color);
}
.subject-filter-label i { color: var(--primary-light); }

.subject-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.subject-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.85rem;
    border-radius: 999px;
    border: 1.5px solid var(--border-color);
    background: #fff;
    color: var(--primary-color);
    font-family: inherit;
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
}
.subject-pill:hover {
    border-color: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--box-shadow);
}
.subject-pill-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 6px;
    background: var(--bg-light);
    color: var(--primary-light);
    font-size: 0.8rem;
    transition: background-color 0.15s ease, color 0.15s ease;
}
.subject-pill-count {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    background: var(--bg-light);
    color: var(--text-light);
    font-weight: 700;
}
.subject-pill.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}
.subject-pill.active .subject-pill-icon { background: rgba(255,255,255,0.18); color: #fff; }
.subject-pill.active .subject-pill-count { background: rgba(255,255,255,0.22); color: #fff; }

.subject-pill-all {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: #fff;
    border-color: transparent;
}
.subject-pill-all:not(.active) {
    background: var(--bg-light);
    color: var(--primary-color);
    border: 1.5px solid var(--border-color);
}
.subject-pill-all .subject-pill-icon { background: rgba(255,255,255,0.18); color: #fff; }
.subject-pill-all:not(.active) .subject-pill-icon { background: #fff; color: var(--primary-light); }

/* ----- Summary ----- */
.archive-summary {
    margin: 0 0 1.25rem;
    color: var(--text-light);
    font-size: 0.95rem;
}
.archive-summary strong {
    color: var(--primary-color);
    font-size: 1.05rem;
}

/* ----- Results ----- */
.archive-results {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 1rem;
}
.archive-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem 1.75rem;
    transition: var(--transition);
    position: relative;
}
.archive-card:hover {
    border-color: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--box-shadow);
}

/* ----- Subject badges on cards ----- */
.archive-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.85rem;
}
.subject-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    border: 1px solid transparent;
}
.subject-badge i { font-size: 0.78rem; }

.subject-safety       { background: #FEE2E2; color: #B91C1C; }
.subject-flow         { background: #DBEAFE; color: #1D4ED8; }
.subject-ml           { background: #EDE9FE; color: #6D28D9; }
.subject-cav          { background: #CFFAFE; color: #0E7490; }
.subject-sustainable  { background: #DCFCE7; color: #166534; }
.subject-pavement     { background: #E5E7EB; color: #374151; }
.subject-behaviour    { background: #FEF3C7; color: #B45309; }
.subject-ptw          { background: #FCE7F3; color: #BE185D; }
.subject-roundabouts  { background: #CCFBF1; color: #0F766E; }
.subject-environment  { background: #D1FAE5; color: #047857; }

.archive-tag-inpress {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.18rem 0.55rem;
    border-radius: 4px;
    background: #FEE2E2;
    color: #B91C1C;
    font-weight: 700;
    margin-left: 0.4rem;
}

.archive-title {
    font-size: 1.1rem;
    line-height: 1.4;
    margin: 0 0 0.6rem;
    color: var(--primary-color);
}
.archive-title mark {
    background: #FEF08A;
    padding: 0 2px;
    border-radius: 2px;
}

.archive-authors {
    margin: 0 0 0.4rem;
    font-size: 0.88rem;
    color: var(--text-light);
}

.archive-venue {
    margin: 0 0 1rem;
    color: var(--text-light);
    font-size: 0.92rem;
}
.archive-venue code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    background: var(--bg-light);
    padding: 0 0.4rem;
    border-radius: 3px;
    color: var(--primary-color);
}

.archive-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.archive-action {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: #fff;
    color: var(--primary-light);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}
.archive-action:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--bg-light);
}
.archive-action i { font-size: 0.85rem; }

.archive-empty {
    background: var(--bg-light);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-light);
}
.archive-empty i {
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
    display: block;
}
.archive-empty p { margin: 0; }

.archive-footer-note {
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
    text-align: center;
}
.archive-footer-note p { margin: 0 0 0.75rem; color: var(--text-light); }
.archive-scholar-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 0.5rem;
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
    .archive-intro { grid-template-columns: 1fr; padding: 1.5rem; }
    .archive-stat { padding: 1rem; }
    .archive-stat-num { font-size: 2.25rem; }
    .archive-controls { padding: 1rem; }
    .subject-filter-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
    .subject-pill { font-size: 0.82rem; padding: 0.42rem 0.7rem; }
    .archive-card { padding: 1.25rem; }
    .subject-badge { font-size: 0.68rem; padding: 0.22rem 0.55rem; }
    .archive-title { font-size: 1rem; }
}