/* =============================================================================
 * Beijing Visits —— Events Calendar (/calendar/)
 * 深青底 + 帝国黄，复用主题色板 (--bv-yellow / --bv-deep / --bv-bg)
 * ========================================================================== */

.bv-calendar-hero {
  padding: 90px var(--bv-section-x) 40px;
  text-align: center;
}
.bv-calendar-hero .bv-title { margin-bottom: 12px; }
.bv-calendar-lead {
  max-width: 720px;
  margin: 0 auto;
  color: var(--bv-white);
  opacity: .82;
  line-height: 1.6;
}

.bv-calendar { padding: 20px var(--bv-section-x) 100px; }

/* --- 筛选栏 ------------------------------------------------------------- */
.bv-evt-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 18px;
}
.bv-evt-filters--month { margin-bottom: 32px; }

.bv-evt-filter {
  appearance: none;
  cursor: pointer;
  padding: 9px 18px;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 999px;
  background: transparent;
  color: var(--bv-white);
  font-family: var(--bv-font);
  font-size: .95rem;
  line-height: 1;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
}
.bv-evt-filter:hover { border-color: var(--bv-yellow); color: var(--bv-yellow); }
.bv-evt-filter.is-active {
  background: var(--bv-yellow);
  border-color: var(--bv-yellow);
  color: var(--bv-deep);
  font-weight: 700;
}

/* --- 卡片网格 ----------------------------------------------------------- */
.bv-evt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 22px;
}
.bv-evt-card {
  display: flex;
  flex-direction: column;
  perspective: 1200px;                 /* 翻转所需透视 */
  background: #102a33;                 /* 比页面底略亮的深色面 */
  border: 1px solid rgba(255, 255, 255, .10);
  border-radius: 14px;
  padding: 24px 24px 22px;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

/* --- 3D 翻转卡片（正面=详情，背面=大字中英文地址） --------------------- */
.bv-evt-inner {
  display: grid;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.4, .2, .2, 1);
}
.bv-evt-front,
.bv-evt-back {
  grid-area: 1 / 1;                    /* 两面叠放，容器高度取较高者 */
  display: flex;
  flex-direction: column;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.bv-evt-back { transform: rotateY(180deg); }
.bv-evt-card.is-flipped .bv-evt-inner { transform: rotateY(180deg); }

.bv-evt-back__eyebrow {
  font-size: .76rem;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--bv-yellow);
  opacity: .85;
  margin-bottom: 14px;
}
.bv-evt-back__cn {
  font-size: 1.45rem;
  line-height: 1.5;
  font-weight: 700;
  color: var(--bv-white);
  margin-bottom: 10px;
}
.bv-evt-back__en {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--bv-white);
  opacity: .82;
  margin-bottom: 22px;
}
.bv-evt-back__actions { margin-top: auto; display: flex; gap: 10px; flex-wrap: wrap; }
.bv-evt-flip-back {
  flex: 0 0 auto;
  padding: 3px 14px;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 6px;
  background: transparent;
  color: var(--bv-white);
  font-family: var(--bv-font);
  font-size: .82rem;
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.bv-evt-flip-back:hover { border-color: var(--bv-yellow); color: var(--bv-yellow); }
.bv-evt-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 222, 47, .55);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .35);
}
.bv-evt-card[hidden] { display: none !important; }

.bv-evt-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.bv-evt-card__title {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.35;
  color: var(--bv-white);
  text-transform: none;                /* 保留活动原名大小写 */
}
.bv-evt-tag {
  flex: 0 0 auto;
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(255, 222, 47, .14);
  border: 1px solid rgba(255, 222, 47, .35);
  color: var(--bv-yellow);
  font-size: .78rem;
  letter-spacing: .02em;
  white-space: nowrap;
}

.bv-evt-card__meta { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.bv-evt-meta {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--bv-white);
  opacity: .92;
  font-size: .95rem;
  line-height: 1.5;
}
.bv-evt-ico { flex: 0 0 auto; font-size: 1.05rem; line-height: 1.4; }
.bv-evt-venue { font-weight: 400; }

.bv-evt-copy {
  flex: 0 0 auto;
  margin-left: 6px;
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 6px;
  background: transparent;
  color: var(--bv-white);
  font-family: var(--bv-font);
  font-size: .76rem;
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.bv-evt-copy:hover { border-color: var(--bv-yellow); color: var(--bv-yellow); }
.bv-evt-copy.is-copied { border-color: var(--bv-yellow); color: var(--bv-yellow); }

.bv-evt-passport {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
  margin-top: 2px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(47, 191, 113, .16);
  border: 1px solid rgba(47, 191, 113, .5);
  color: #5fe0a0;
  font-size: .8rem;
  font-weight: 700;
}
.bv-evt-view {
  display: inline-block;
  margin-top: 14px;
  color: var(--bv-yellow);
  font-size: .9rem;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease;
}
.bv-evt-view:hover { border-color: var(--bv-yellow); }

.bv-evt-desc {
  margin: 0 0 16px;
  color: var(--bv-white);
  opacity: .8;
  line-height: 1.6;
  font-size: .95rem;
}

/* --- How to Join 手风琴 ------------------------------------------------- */
.bv-evt-toggle {
  appearance: none;
  cursor: pointer;
  margin-top: auto;
  padding: 10px 0;
  border: 0;
  border-top: 1px solid rgba(255, 255, 255, .12);
  background: transparent;
  color: var(--bv-yellow);
  font-family: var(--bv-font);
  font-size: .92rem;
  text-align: left;
  position: relative;
}
.bv-evt-toggle::after {
  content: '+';
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  line-height: 1;
}
.bv-evt-toggle.is-open::after { content: '\2013'; }   /* – */
.bv-evt-toggle:hover { color: var(--bv-yellow-dark); }

.bv-evt-details {
  padding: 14px 0 4px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  color: var(--bv-white);
  opacity: .88;
  font-size: .92rem;
  line-height: 1.6;
}
.bv-evt-details[hidden] { display: none; }
.bv-evt-line { margin: 0 0 10px; }
.bv-evt-line strong { color: var(--bv-yellow); font-weight: 700; }
.bv-evt-source { color: var(--bv-yellow); }

/* --- 空状态 ------------------------------------------------------------- */
.bv-evt-empty {
  text-align: center;
  color: var(--bv-white);
  opacity: .7;
  padding: 40px 0;
  font-size: 1rem;
}
.bv-evt-empty[hidden] { display: none; }

/* --- 迷你月历 ----------------------------------------------------------- */
.bv-minical {
  margin: 0 0 36px;
  padding: 20px;
  background: #102a33;
  border: 1px solid rgba(255, 255, 255, .10);
  border-radius: 14px;
}
.bv-minical__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.bv-minical__title {
  color: var(--bv-yellow);
  font-weight: 700;
  font-size: 1.05rem;
}
.bv-minical__nav {
  appearance: none;
  cursor: pointer;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .25);
  background: transparent;
  color: var(--bv-white);
  font-size: 1.2rem;
  line-height: 1;
  transition: border-color .15s ease, color .15s ease, opacity .15s ease;
}
.bv-minical__nav:hover:not(:disabled) { border-color: var(--bv-yellow); color: var(--bv-yellow); }
.bv-minical__nav:disabled { opacity: .3; cursor: not-allowed; }
.bv-minical__weekdays,
.bv-minical__grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}
.bv-minical__weekdays {
  margin-bottom: 6px;
}
.bv-minical__weekdays span {
  text-align: center;
  font-size: .72rem;
  opacity: .55;
}
.bv-minical__cell {
  position: relative;
  min-height: 50px;                 /* 长方形紧凑格子（不再用正方形） */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(255, 255, 255, .04);
  color: var(--bv-white);
}
.bv-minical__date {                 /* 左上角小日期，仅作定位参考（淡化） */
  position: absolute;
  top: 3px; left: 6px;
  font-size: .68rem;
  line-height: 1;
  opacity: .5;
}
.bv-minical__cell.has-evt {
  cursor: pointer;
  background: rgba(255, 222, 47, .12);
  border: 1px solid rgba(255, 222, 47, .35);
}
.bv-minical__cell.has-evt:hover { background: rgba(255, 222, 47, .22); }
.bv-minical__cell.has-evt--many { background: rgba(255, 222, 47, .26); }   /* 当天 ≥3 活动，整格加深更醒目 */
.bv-minical__cell.is-selected { outline: 2px solid var(--bv-yellow); outline-offset: -2px; }
.bv-minical__pips {                 /* 用点的个数表示当天活动数量，避免与日期数字混淆 */
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 4px;
  padding: 0 6px;
}
.bv-minical__pip {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--bv-yellow);
  flex: 0 0 auto;
}
.bv-minical__cell.has-evt--many .bv-minical__pip { background: #fff2a8; }   /* 密集天点更亮，配合整格加深 */
.bv-minical__pip--more {                     /* 当天 >6 场时用「+」收尾 */
  width: auto; height: auto;
  border-radius: 0;
  background: none;
  color: var(--bv-yellow);
  font-size: .62rem;
  font-style: normal;
  font-weight: 700;
  line-height: 1;
}
.bv-minical__cell.is-today {                 /* 今天：内描边，一眼定位 */
  box-shadow: inset 0 0 0 2px rgba(255, 222, 47, .85);
}
.bv-minical__cell.is-today .bv-minical__date { opacity: 1; font-weight: 700; color: var(--bv-yellow); }
.bv-minical__status {
  margin: 14px 0 0;
  padding: 8px 12px;
  display: inline-block;
  border-radius: 999px;
  background: rgba(255, 222, 47, .14);
  border: 1px solid rgba(255, 222, 47, .35);
  color: var(--bv-yellow);
  font-size: .85rem;
  cursor: pointer;
}
.bv-minical__status[hidden] { display: none; }
.bv-minical__hint {
  margin: 12px 0 0;
  font-size: .8rem;
  opacity: .6;
}
.bv-minical__updated {
  margin: 6px 0 0;
  font-size: .8rem;
  line-height: 1.5;
  opacity: .62;
}
.bv-minical__updated strong { color: var(--bv-yellow); font-weight: 700; }

/* --- 响应式 ------------------------------------------------------------- */
@media (max-width: 680px) {
  .bv-evt-grid { grid-template-columns: 1fr; gap: 16px; }
  .bv-calendar-hero { padding-top: 64px; }
  .bv-evt-card { padding: 20px 18px; }
  .bv-minical { padding: 16px 14px; }
  .bv-minical__cell { font-size: .82rem; }
  .bv-evt-back__cn { font-size: 1.2rem; }
}

/* --- pSEO 对比页入口条 ------------------------------------------------- */
.bv-compare-strip {
  padding: 28px var(--bv-section-x) 8px;
  text-align: center;
}
.bv-compare-strip .bv-eyebrow { display: block; margin-bottom: 6px; }
.bv-compare-strip__lead {
  margin: 0 0 14px;
  color: var(--bv-white);
  opacity: .82;
  font-size: 1.02rem;
}
.bv-compare-strip__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.bv-compare-strip__links a {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 222, 47, 0.35);
  background: rgba(11, 35, 41, 0.5);
  color: var(--bv-yellow);
  font-size: 0.92rem;
  transition: background 0.15s ease, color 0.15s ease;
}
.bv-compare-strip__links a:hover {
  background: var(--bv-yellow);
  color: var(--bv-deep);
}