/* ── Hero ─────────────────────────────────────────────────── */
.dl-hero {
    background: linear-gradient(135deg, var(--primary-tint), var(--bg));
    border-bottom: 1px solid var(--border);
    padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2rem, 4vw, 3.5rem);
}
.dl-hero__inner {
    width: var(--wrap);
    margin-inline: auto;
    text-align: center;
}
.dl-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: var(--tx-xs);
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--primary-tint);
    border: 1px solid var(--primary-glow);
    padding: .35rem .9rem;
    border-radius: var(--r-full);
    margin-bottom: 1.2rem;
}
.dl-hero__title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    letter-spacing: -.03em;
    line-height: 1.1;
    background: linear-gradient(120deg, var(--text) 40%, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .75rem;
}
.dl-hero__sub {
    font-size: var(--tx-base);
    color: var(--text-muted);
    max-width: 54ch;
    margin-inline: auto;
    margin-bottom: 2rem;
    line-height: 1.7;
}

/* Quick jump pills */
.dl-jumps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .5rem;
}
.dl-jump {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .45rem 1rem;
    border-radius: var(--r-full);
    font-size: var(--tx-xs);
    font-weight: 700;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    color: var(--accent);
    transition: background var(--ease), transform var(--ease);
}
.dl-jump:hover {
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    transform: translateY(-2px);
}

/* ── Sections Wrapper ─────────────────────────────────────── */
.dl-sections { padding: clamp(2rem, 4vw, 4rem) 0; }
.dl-wrap {
    width: var(--wrap);
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

/* ── Card ─────────────────────────────────────────────────── */
.dl-card {
    border-radius: var(--r-xl);
    border: 1px solid var(--border);
    background: var(--surface-2);
    box-shadow: var(--sh-sm);
    overflow: hidden;
    scroll-margin-top: calc(var(--h-nav) + 1rem);
}

/* Card Header */
.dl-card__head {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--accent) 8%, var(--surface-2));
}
.dl-card__icon {
    font-size: 2rem;
    line-height: 1;
    flex-shrink: 0;
}
.dl-card__title {
    font-size: var(--tx-lg);
    font-weight: 900;
    color: var(--accent);
    letter-spacing: -.02em;
    line-height: 1.1;
}
.dl-card__count {
    display: block;
    font-size: var(--tx-xs);
    color: var(--text-muted);
    margin-top: .2rem;
    font-weight: 500;
}
.dl-card__more {
    margin-left: auto;
    flex-shrink: 0;
    font-size: var(--tx-xs);
    font-weight: 700;
    color: var(--accent);
    padding: .4rem .9rem;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-radius: var(--r-full);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    transition: background var(--ease), transform var(--ease);
}
.dl-card__more:hover {
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    transform: translateY(-1px);
}

/* ── Papers List ─────────────────────────────────────────── */
.dl-list {
    list-style: none;
    padding: .5rem;
}
.dl-item {
    display: grid;
    grid-template-columns: 2rem 1fr auto auto;
    align-items: center;
    gap: .75rem;
    padding: .9rem 1rem;
    border-radius: var(--r-lg);
    transition: background var(--ease);
}
.dl-item:hover {
    background: var(--primary-tint);
}
.dl-item + .dl-item {
    border-top: 1px solid var(--border-lt);
}

.dl-item__num {
    font-size: var(--tx-xs);
    font-weight: 700;
    color: var(--text-faint);
    font-variant-numeric: tabular-nums;
}
.dl-item__name {
    font-size: var(--tx-sm);
    font-weight: 600;
    color: var(--text);
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.dl-item__year {
    font-size: var(--tx-xs);
    font-weight: 600;
    color: var(--text-faint);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: .2rem .55rem;
    border-radius: var(--r-full);
    white-space: nowrap;
}

/* Download Button */
.dl-btn {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    height: 2.25rem;
    padding-inline: .875rem;
    border-radius: var(--r-full);
    font-size: var(--tx-xs);
    font-weight: 800;
    white-space: nowrap;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-h));
    box-shadow: 0 4px 12px var(--primary-glow);
    transition: transform var(--ease), filter var(--ease);
}
.dl-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.08);
}
.dl-btn:active { transform: translateY(0); }

.dl-btn--soon {
    background: var(--surface);
    color: var(--text-faint);
    border: 1px solid var(--border);
    box-shadow: none;
    cursor: default;
    font-weight: 600;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 640px) {
    .dl-item {
        grid-template-columns: 1.5rem 1fr auto;
        grid-template-rows: auto auto;
    }
    .dl-item__year { display: none; }
    .dl-item__name { white-space: normal; }
    .dl-card__head { flex-wrap: wrap; }
    .dl-card__more { margin-left: 0; width: 100%; text-align: center; }
}
@media (max-width: 400px) {
    .dl-item__num { display: none; }
    .dl-card__head { gap: .6rem; }
}