/* Vitrine 菜单页样式。
   质感取向是 Material Design（Vuetify 那一套）：白底、低饱和灰阶文字、
   分层投影、.28s cubic-bezier(.4,0,.2,1) 标准缓动，反馈靠水波纹。 */

:root {
  --primary: #1976d2;
  --text-high: rgba(0, 0, 0, .87);
  --text-mid: rgba(0, 0, 0, .6);
  --text-low: rgba(0, 0, 0, .38);
  --line: rgba(0, 0, 0, .08);
  --grey-50: #fafafa;
  --grey-100: #f5f5f5;
  --radius: 8px;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --dur: .28s;

  /* Vuetify 的 elevation 阴影原值 */
  --e1: 0 2px 1px -1px rgba(0, 0, 0, .2), 0 1px 1px 0 rgba(0, 0, 0, .14), 0 1px 3px 0 rgba(0, 0, 0, .12);
  --e4: 0 2px 4px -1px rgba(0, 0, 0, .2), 0 4px 5px 0 rgba(0, 0, 0, .14), 0 1px 10px 0 rgba(0, 0, 0, .12);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

/* 纵向撑满视口，页脚的备案信息才会沉在页面底部（内容不够高时也不悬在半空） */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  background: #fff;
  color: var(--text-high);
  font-family: Roboto, "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: rgba(25, 118, 210, .16); }

/* 顶栏。静止时只有一条分隔线，页面滚起来之后才浮起投影（.is-scrolled 由 app.js 打），
   免得白底的内容滚到顶栏下面时糊成一片。 */
.appbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--dur) var(--ease);
}
.appbar.is-scrolled {
  box-shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 4px 14px -8px rgba(0, 0, 0, .28);
}
.appbar__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 1200px;
  height: 64px;
  margin: 0 auto;
  padding: 0 24px;
}

.brand { display: flex; flex: none; align-items: center; gap: 12px; color: inherit; text-decoration: none; border-radius: 6px; }
.brand:focus-visible { outline: 2px solid var(--primary); outline-offset: 4px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  color: #fff;
  border-radius: 11px;
  background: linear-gradient(135deg, #42a5f5, #1565c0);
  box-shadow: 0 2px 6px rgba(25, 118, 210, .32), inset 0 1px 0 rgba(255, 255, 255, .28);
  transition: box-shadow var(--dur) var(--ease);
}
.brand:hover .brand__mark { box-shadow: 0 4px 12px rgba(25, 118, 210, .42), inset 0 1px 0 rgba(255, 255, 255, .28); }
.brand__mark svg { width: 20px; height: 20px; fill: currentColor; }
/* 图标只是装饰，别让它挡住所在按钮/链接的点击目标。 */
.field__icon,
.field__clear svg,
.brand__mark svg { pointer-events: none; }
.brand__text { display: flex; flex-direction: column; gap: 1px; line-height: 1.2; }
.brand__title { font-size: 1rem; font-weight: 600; letter-spacing: .01em; }
.brand__sub { font-size: .75rem; color: var(--text-low); letter-spacing: .04em; }

/* 搜索框 */
.field {
  display: flex;
  align-items: center;
  width: min(400px, 100%);
  height: 40px;
  margin-left: auto;
  padding: 0 8px 0 12px;
  border-radius: var(--radius);
  background: var(--grey-100);
  cursor: text;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.field:focus-within {
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--primary), 0 0 0 3px rgba(25, 118, 210, .12);
}
.field__icon { flex: none; width: 18px; height: 18px; fill: var(--text-low); }
.field__input {
  flex: 1;
  min-width: 0;
  height: 100%;
  padding: 0 8px;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: .875rem;
  color: var(--text-high);
}
.field__input::placeholder { color: var(--text-low); }
.field__clear {
  display: grid;
  flex: none;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-low);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.field__clear:hover { background: rgba(0, 0, 0, .06); color: var(--text-mid); }
.field__clear svg { width: 16px; height: 16px; fill: currentColor; }

.count {
  display: inline-flex;
  flex: none;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  border-radius: 14px;
  background: var(--grey-100);
  color: var(--text-mid);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .02em;
  white-space: nowrap;
}

/* 内容区。flex: 1 保证内容不满一屏时，页脚也是贴底的 */
.container { flex: 1; max-width: 1200px; margin: 0 auto; padding: 40px 24px 64px; }

/* 卡片 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--e1);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover { box-shadow: var(--e4); transform: translateY(-2px); }

/* 链接和预览层是兄弟节点：iframe 属于交互性内容，不能嵌在 <a> 里 */
.card__link {
  display: flex;
  flex: 1;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
}
.card__link:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; }

.card__media {
  position: relative;
  display: grid;
  place-items: center;
  /* 缩略图和悬停预览都按 3:2 出图，和这里保持一致才不会裁切 */
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  /* 没有缩略图时用一层淡色晕染加网点当占位，比纯灰块耐看。 */
  background-color: var(--grey-50);
  background-image:
    radial-gradient(circle at 28% 18%, rgba(25, 118, 210, .10), transparent 58%),
    radial-gradient(circle at 80% 86%, rgba(124, 77, 255, .08), transparent 58%),
    radial-gradient(rgba(0, 0, 0, .05) 1px, transparent 1px);
  background-size: auto, auto, 14px 14px;
}
.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s var(--ease), opacity var(--dur) var(--ease);
}
.card:hover .card__media img { transform: scale(1.03); }

/* 封面图加载期间铺一层骨架屏：图有几百 KB，不能让封面区一直空着 */
.card__media.is-loading img,
.card__media.is-failed img { opacity: 0; }
.card__skeleton {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: linear-gradient(90deg, #f7f7f7 25%, #ededed 37%, #f7f7f7 63%);
  background-size: 400% 100%;
  transition: opacity var(--dur) var(--ease);
  animation: skeleton-sweep 1.4s ease infinite;
}
.card__media.is-loading .card__skeleton { opacity: 1; }
@keyframes skeleton-sweep {
  from { background-position: 100% 50%; }
  to { background-position: 0 50%; }
}
/* 没有封面、或封面加载失败时，就是一层干净的灰色遮罩 */
.card__placeholder {
  position: absolute;
  inset: 0;
  background: var(--grey-100);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.card__media.is-failed .card__placeholder { opacity: 1; }

/* 悬停预览：把真实页面按桌面尺寸塞进一个 iframe，再整体缩到封面大小。
   不能吃掉鼠标事件，否则卡片的悬停和点击都被挡住。 */
.card__preview {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.card__preview.is-ready { opacity: 1; }
.card__frame {
  display: block;
  width: 1200px;
  height: 800px;
  border: 0;
  transform: scale(var(--preview-scale, .25));
  transform-origin: 0 0;
}

/* 文字区收紧，把版面让给上面的预览 */
.card__body { display: flex; flex: 1; flex-direction: column; gap: 4px; padding: 12px 14px 10px; }
.card__title { margin: 0; font-size: .9375rem; font-weight: 500; line-height: 1.4; letter-spacing: .007em; }
.card__desc {
  display: -webkit-box;
  overflow: hidden;
  margin: 0;
  color: var(--text-mid);
  font-size: .8125rem;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
}
.card__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: auto; padding-top: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 9px;
  border-radius: 10px;
  background: var(--grey-100);
  color: var(--text-mid);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .02em;
}
.card__date {
  margin-left: auto;
  color: var(--text-low);
  font-size: .6875rem;
  font-variant-numeric: tabular-nums;
}

/* 空状态 */
.empty { display: grid; justify-items: center; gap: 6px; padding: 72px 24px; text-align: center; }
.empty__title { margin: 0; font-size: 1rem; font-weight: 500; }
.empty__hint { max-width: 34em; margin: 0; color: var(--text-mid); font-size: .875rem; }
.empty__hint code {
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--grey-100);
  font-family: "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: .8125rem;
}

/* 页脚：备案信息按国内网站的惯例放在主页底部，链接指向工信部、公安部的官方查询入口 */
.footer {
  border-top: 1px solid var(--line);
  background: var(--grey-50);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 36px;
  color: var(--text-low);
  font-size: .8125rem;
  text-align: center;
}
.footer__row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 6px; margin: 0; }
.footer__dot { color: rgba(0, 0, 0, .2); }
.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-mid);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.footer__link:hover { color: var(--primary); }
.footer__badge { width: 16px; height: 16px; }

/* 按下时回落一下作为点击反馈；卡片大，转一圈水波纹反而显脏，就不做了 */
.card:active { box-shadow: var(--e1); transform: translateY(0); }

@media (max-width: 720px) {
  .appbar__inner { flex-wrap: wrap; height: auto; padding: 12px 16px; gap: 12px; }
  .brand__sub { display: none; }
  .count { margin-left: auto; }
  .field { order: 3; flex: 1 1 100%; width: 100%; margin-left: 0; }
  .container { padding: 28px 16px 48px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
  .footer__inner { padding: 24px 16px 32px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}