/* 京城博物馆展讯 —— 报刊展讯 / 宣纸墨线 风格
   字体只用系统内置中文（不依赖外网 CDN，国内手机可直接打开） */

:root {
  --paper: #f6f2e9;
  --paper-2: #efe8da;
  --paper-3: #e7dfcd;
  --ink: #1b1a17;
  --ink-2: #4a463f;
  --ink-3: #877f72;
  --seal: #a8342a;
  --seal-soft: rgba(168, 52, 42, 0.1);
  --jade: #3f6153;
  --amber: #9a6b1f;
  --line: rgba(27, 26, 23, 0.14);
  --line-strong: rgba(27, 26, 23, 0.28);
  --card: #fbf8f1;
  --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 3px;
  --shadow: 0 1px 0 rgba(27, 26, 23, 0.04), 0 6px 18px -12px rgba(27, 26, 23, 0.5);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 12% -8%, #fdfaf3 0%, transparent 60%),
    radial-gradient(900px 500px at 100% 0%, #f2ead9 0%, transparent 55%),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0.01em;
}

/* 纸张颗粒 + 边角压暗，制造"印张"质感（纯 CSS，无外部资源） */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  background-image:
    repeating-linear-gradient(0deg, rgba(27, 26, 23, 0.022) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(27, 26, 23, 0.016) 0 1px, transparent 1px 4px);
  mask-image: radial-gradient(120% 100% at 50% 0%, #000 55%, transparent 100%);
}

main, .masthead, .colophon { position: relative; z-index: 1; }

/* ── 报头 ───────────────────────────────── */
.masthead { max-width: 1180px; margin: 0 auto; padding: 48px 28px 0; }

.masthead__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 26px;
  align-items: start;
}

.seal {
  width: 62px; height: 62px;
  display: grid; place-items: center;
  background: var(--seal);
  color: #fdf8ee;
  border-radius: 2px;
  font-family: var(--serif);
  font-size: 40px;
  line-height: 1;
  box-shadow: inset 0 0 0 2px rgba(253, 248, 238, 0.35), 0 2px 10px -4px rgba(168, 52, 42, 0.7);
  transform: rotate(-1.2deg);
}
.seal span { transform: translateY(-1px); }

.kicker {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--seal);
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(34px, 5.2vw, 56px);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.08;
}

.dek {
  margin: 12px 0 0;
  max-width: 46ch;
  color: var(--ink-2);
  font-size: 15px;
}

.stamp {
  margin: 4px 0 0;
  display: grid;
  gap: 10px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.stamp dt { font-size: 11px; letter-spacing: 0.18em; color: var(--ink-3); }
.stamp dd { margin: 0; font-family: var(--serif); font-size: 20px; }

.rule {
  margin: 26px 0 0;
  border: 0;
  border-top: 1px solid var(--line-strong);
  position: relative;
}
.rule::after {
  content: "";
  position: absolute; left: 0; right: 0; top: 3px;
  border-top: 1px solid var(--line);
}

/* ── 工具条 ─────────────────────────────── */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 28px;
  background: linear-gradient(180deg, rgba(246, 242, 233, 0.97) 70%, rgba(246, 242, 233, 0.82));
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.search { position: relative; flex: 1 1 260px; min-width: 220px; }
.search__icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-52%);
  color: var(--ink-3); font-size: 18px; pointer-events: none;
}
.search input {
  width: 100%;
  padding: 10px 12px 10px 34px;
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.search input:focus { border-color: var(--seal); box-shadow: 0 0 0 3px var(--seal-soft); }
.search input::placeholder { color: var(--ink-3); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
  padding: 5px 11px;
  font: inherit;
  font-size: 13px;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.16s, color 0.16s, border-color 0.16s, transform 0.16s;
}
.chip:hover { border-color: var(--ink-2); transform: translateY(-1px); }
.chip[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.toggle, .sort {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--ink-2);
}
.toggle input { accent-color: var(--seal); width: 15px; height: 15px; }
.sort select {
  font: inherit; font-size: 13px; color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 6px 8px;
}

.reset {
  font: inherit; font-size: 13px;
  padding: 6px 12px;
  color: var(--seal);
  background: transparent;
  border: 1px solid var(--seal);
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.16s, color 0.16s;
}
.reset:hover { background: var(--seal); color: #fdf8ee; }

.hint {
  max-width: 1180px;
  margin: 18px auto 0;
  padding: 0 28px;
  font-size: 13px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* ── 卡片 ───────────────────────────────── */
.board {
  max-width: 1180px;
  margin: 18px auto 0;
  padding: 0 28px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 20px;
  align-items: start;
}

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 20px 16px;
  opacity: 0;
  animation: rise 0.5s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: 0 2px 0 rgba(27, 26, 23, 0.04), 0 14px 26px -18px rgba(27, 26, 23, 0.7);
}
/* 左上角朱砂角标 */
.card::before {
  content: "";
  position: absolute; left: -1px; top: -1px;
  width: 22px; height: 22px;
  border-top: 3px solid var(--seal);
  border-left: 3px solid var(--seal);
  border-top-left-radius: var(--radius);
  opacity: 0.9;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.card__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 8px; }
.card h2 {
  margin: 0 auto 0 0;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
}
.card h2 a { color: inherit; text-decoration: none; border-bottom: 1px solid transparent; }
.card h2 a:hover { border-bottom-color: var(--seal); }

.tag {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--jade);
  border: 1px solid currentColor;
  border-radius: 100px;
  padding: 2px 8px;
  white-space: nowrap;
}

.tag--closed {
  color: var(--seal);
  background: var(--seal-soft);
  border-color: var(--seal);
  letter-spacing: 0.06em;
}

.card__meta {
  margin: 8px 0 0;
  font-size: 12.5px;
  color: var(--ink-3);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
}
.card__meta b { font-weight: 500; color: var(--ink-2); }

.exhibitions { list-style: none; margin: 14px 0 0; padding: 14px 0 0; border-top: 1px dashed var(--line); display: grid; gap: 13px; }

.ex { display: grid; gap: 3px; }
.ex__top { display: flex; align-items: baseline; gap: 8px; }
.ex__title { font-size: 15px; font-weight: 600; line-height: 1.45; }

.dot {
  flex: none;
  width: 7px; height: 7px;
  border-radius: 50%;
  transform: translateY(-2px);
  background: var(--ink-3);
}
.ex--live .dot { background: var(--seal); box-shadow: 0 0 0 3px var(--seal-soft); }
.ex--soon .dot { background: var(--amber); }
.ex--past .dot { background: var(--line-strong); }
.ex--past .ex__title { color: var(--ink-3); font-weight: 500; }

.ex__facts {
  display: flex; flex-wrap: wrap; gap: 3px 12px;
  font-size: 12.5px; color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.ex__facts .d { font-family: var(--mono); font-size: 12px; }
.ex__facts .venue::before { content: "· "; color: var(--ink-3); }

.badge {
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 1px 6px;
  border-radius: 2px;
  border: 1px solid currentColor;
}
.badge--live { color: var(--seal); }
.badge--soon { color: var(--amber); }
.badge--past { color: var(--ink-3); }
.badge--unknown { color: var(--jade); }

.src {
  font-size: 12px;
  color: var(--ink-3);
  text-decoration: none;
  border-bottom: 1px dotted var(--line-strong);
}
.src:hover { color: var(--seal); border-bottom-color: var(--seal); }

.card__note {
  margin: 12px 0 0;
  padding: 9px 11px;
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--paper-2);
  border-left: 2px solid var(--line-strong);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.card__note > summary {
  cursor: pointer;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.card__note > summary:hover { color: var(--seal); }
.card__note[open] > summary { margin-bottom: 6px; }

.card__empty { margin: 14px 0 0; padding-top: 12px; border-top: 1px dashed var(--line); font-size: 13px; color: var(--ink-3); }

/* ── 空态 & 页脚 ─────────────────────────── */
.empty { max-width: 1180px; margin: 40px auto; padding: 0 28px; text-align: center; color: var(--ink-3); }
.empty__big { font-family: var(--serif); font-size: 26px; color: var(--ink-2); margin: 0 0 6px; }

.colophon { max-width: 1180px; margin: 0 auto; padding: 8px 28px 64px; }
.colophon__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-top: 22px; }
.colophon h2 { margin: 0 0 6px; font-size: 12px; letter-spacing: 0.2em; color: var(--ink-3); font-weight: 600; }
.colophon p { margin: 0; font-size: 13px; color: var(--ink-2); }
.colophon code { font-family: var(--mono); font-size: 12px; background: var(--paper-2); padding: 1px 5px; border-radius: 2px; }

@media (max-width: 760px) {
  .masthead { padding: 30px 18px 0; }
  .masthead__inner { grid-template-columns: auto 1fr; gap: 16px; }
  .stamp { grid-column: 1 / -1; grid-auto-flow: column; justify-content: start; gap: 22px; text-align: left; }
  .stamp dt { font-size: 10px; }
  .stamp dd { font-size: 17px; }
  .seal { width: 52px; height: 52px; font-size: 33px; }
  .toolbar { padding: 12px 18px; position: static; }
  .search { flex-basis: 100%; }
  .board { padding: 0 18px 32px; grid-template-columns: 1fr; gap: 16px; }
  .hint, .colophon, .empty { padding-left: 18px; padding-right: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .card { animation: none; opacity: 1; }
  .card:hover { transform: none; }
}

@media print {
  .toolbar, .grain { display: none; }
  .card { break-inside: avoid; box-shadow: none; }
}