/* ============================================================
   os-korea — issue archive (volumes + issue cards)
   ============================================================ */
.archive-panel { display: flex; flex-direction: column; gap: 18px; }
.volume-section { border: 1px solid var(--line); border-radius: 6px; background: #fff; overflow: hidden; }
.volume-title {
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    cursor: pointer;
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    color: var(--navy);
    background: var(--light);
    border-left: 3px solid var(--gold);
    transition: background-color .2s ease, color .2s ease;
}
.volume-title::-webkit-details-marker { display: none; }
.volume-title:hover { color: var(--gold-ink); }
.volume-chevron { font-size: 22px; color: var(--gold); transition: transform .2s ease; }
.volume-section[open] .volume-chevron { transform: rotate(180deg); }
.volume-section[open] .volume-title { border-bottom: 1px solid var(--line); }
.volume-panel { padding: 26px 24px; }
.issues-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 24px; }
.issue-card { min-width: 0; }
.hk-body .issue-link { background: #fff; display: flex; flex-direction: column; height: 100%; color: var(--ink); border-radius: 6px; overflow: hidden; box-shadow: 0 2px 10px rgba(15, 37, 64, .06); border: 1px solid var(--line); transition: transform .25s ease, box-shadow .25s ease; }
.hk-body .issue-link:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(15, 37, 64, .12); color: var(--ink); }
.issue-cover { aspect-ratio: 3 / 4; background: var(--light); overflow: hidden; }
.issue-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.issue-cover-placeholder { display: flex; align-items: center; justify-content: center; background: linear-gradient(160deg, #2B6CB0, #0F2540); }
.placeholder-content { display: flex; flex-direction: column; align-items: center; gap: 4px; color: #fff; font-family: var(--serif); font-size: 18px; }
.placeholder-content span + span { color: var(--gold-2); font-size: 14px; letter-spacing: 2px; text-transform: uppercase; font-family: var(--sans); }
.issue-info { padding: 14px 16px 16px; display: flex; flex-direction: column; flex: 1; }
.issue-volume-number { font-family: var(--serif); font-weight: 700; font-size: 16px; color: var(--navy); margin: 0 0 4px; }
.issue-date { font-size: 13px; color: var(--gray); margin: 0 0 10px; }
.issue-view-link { margin-top: auto; font-size: 13px; font-weight: 600; color: var(--navy); }
.issue-view-link b { color: var(--gold); }
.issue-link:hover .issue-view-link { color: var(--gold-ink); }
.hk-archive-note { margin-top: 30px; color: var(--gray); font-size: 14px; overflow-wrap: anywhere; }

@media (max-width: 680px) {
    .issues-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
    .volume-panel { padding: 18px 14px; }
    .volume-title { padding: 14px 16px; font-size: 18px; }
}