/* WeChat-style reference card */

/*******************************
Example:

<div class="ref-card" style="--ref-card-width: 45%; --ref-card-height: 120px;" href="https://www.bilibili.com/video/BV1n62VBxERz" target="_blank" rel="noopener noreferrer">
  <div class="ref-card__body">
    <p class="ref-card__title">【冯柯南】一张图，找到位置在哪？人脑VS人工智能！</p>
    <p class="ref-card__meta">UP 主：冯柯南up</p>
    <p class="ref-card__meta">播放：25.3 万</p>
    <img class="ref-card__thumb" src="https://picsum.photos/220/140" alt="链接配图" loading="lazy" />
  </div>
  <div class="ref-card__footer">
    <img class="ref-card__favicon" src="https://www.bilibili.com/favicon.ico" alt="哔哩哔哩" loading="lazy"/>
    <span class="ref-card__site">哔哩哔哩</span>
  </div>
</div>

*******************************/

.ref-card {
  --card-bg: #f1f1f1;
  --card-text: #1f1f1f;
  --card-muted: #9f9f9f;
  --card-line: #b8b8b8;
  --card-shadow: 0 5px 7px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 8px 9px rgba(0, 0, 0, 0.6);
  --ref-card-width: min(92vw, 620px);
  --ref-card-height: auto;
  --ref-card-tail-size: clamp(9px, 3.2cqi, 14px);
  --ref-card-thumb-size: clamp(30px, 15cqi, 54px);
  --ref-card-title-gap: clamp(4px, 2.4cqi, 8px);
  --ref-card-body-row-gap: clamp(1px, 0.6cqi, 3px);
  --ref-card-footer-margin-top: clamp(12px, 3.0cqi, 16px);
  --ref-card-footer-padding-top: clamp(3px, 1.6cqi, 6px);

  position: relative;
  display: block;
  width: var(--ref-card-width);
  height: auto;
  min-height: var(--ref-card-height);
  container-type: inline-size;
  container-name: ref-card;
  padding: clamp(5px, 2.8cqi, 10px) clamp(10px, 5.4cqi, 20px) clamp(3px, 1.8cqi, 7px);
  border-radius: clamp(8px, 3.2cqi, 12px);
  background: var(--card-bg);
  color: var(--card-text);
  text-decoration: none;
  cursor: pointer;
  filter: drop-shadow(var(--card-shadow));
  transition: transform 0.18s ease, filter 0.18s ease;
}

.ref-card:hover {
  transform: translateY(-2px);
  filter: drop-shadow(var(--card-shadow-hover));
}

.ref-card:focus-visible {
  outline: 3px solid #5a9bff;
  outline-offset: 2px;
}

/* 右上角小三角 */
.ref-card::after {
  content: "";
  position: absolute;
  top: clamp(12px, 2.7cqi, 20px);
  right: calc(var(--ref-card-tail-size) * -0.75);
  width: var(--ref-card-tail-size);
  height: calc(var(--ref-card-tail-size) * 1.8);
  background: var(--card-bg);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  z-index: 1;
  transform: translateX(-1px);
}

.ref-card__body {
  /* 三格布局：标题独占顶部，副标题与配图分居下方左右格 */
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--ref-card-thumb-size);
  grid-template-rows: auto auto auto;
  column-gap: clamp(8px, 3.2cqi, 14px);
  row-gap: var(--ref-card-body-row-gap);
  min-height: max(clamp(58px, 25cqi, 98px), calc(var(--ref-card-thumb-size) + var(--ref-card-title-gap)));
}

.ref-card__title {
  grid-column: 1 / -1;
  grid-row: 1;
  margin: 0 0 var(--ref-card-title-gap);
  font-size: clamp(6px, 9.4cqi, 20px);
  line-height: 1.18;
  font-weight: 400;
  letter-spacing: 0.2px;
  color: var(--card-text);

  /* 标题过长时最多两行 */
  display: -webkit-box;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ref-card__meta {
  grid-column: 1;
  margin: 0;
  font-size: clamp(4px, 7.4cqi, 15px);
  line-height: 1.2;
  font-weight: 400;
  color: var(--card-muted);
}

.ref-card__thumb {
  grid-column: 2;
  grid-row: 2 / 4;
  justify-self: end;
  align-self: center;
  width: var(--ref-card-thumb-size);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  border-radius: clamp(2px, 0.7cqi, 4px);
  background: #ddd;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.ref-card__footer {
  display: flex;
  align-items: center;
  gap: clamp(6px, 2.7cqi, 10px);
  margin-top: var(--ref-card-footer-margin-top);
  padding-top: var(--ref-card-footer-padding-top);
  border-top: clamp(1px, 0.55cqi, 2px) solid var(--card-line);
}

.ref-card__favicon {
  width: clamp(14px, 6.7cqi, 26px);
  height: clamp(14px, 6.7cqi, 26px);
  border-radius: clamp(3px, 1.5cqi, 6px);
  object-fit: cover;
  flex: 0 0 auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.ref-card__site {
  font-size: clamp(4px, 8.2cqi, 13px);
  line-height: 1;
  font-weight: 400;
  color: var(--card-muted);
}