/* ============================================================
   教室大屏展示页 —— 全程静态，无位移动画
   ============================================================ */
body {
  overflow: hidden;
}

.page {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  padding: clamp(20px, 3.6vh, 56px) clamp(24px, 4.5vw, 96px);
  background-image: radial-gradient(1200px 820px at 12% 6%, var(--glow-a), transparent 68%),
    radial-gradient(1100px 760px at 88% 94%, var(--glow-b), transparent 70%);
}

/* 极淡的柔光装饰，纯静态 */
.page::before,
.page::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
.page::before {
  width: 44vw;
  height: 44vw;
  left: -14vw;
  bottom: -18vw;
  background: radial-gradient(circle, var(--deco-a), transparent 70%);
}
.page::after {
  width: 38vw;
  height: 38vw;
  right: -12vw;
  top: -14vw;
  background: radial-gradient(circle, var(--deco-b), transparent 70%);
}
:root[data-theme="eye"] .page::before,
:root[data-theme="eye"] .page::after {
  display: none;
}

.page > * {
  position: relative;
  z-index: 1;
}

/* ------------------------------ 顶栏 ------------------------------ */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  font-size: clamp(14px, 1.15vw, 22px);
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 0.6em;
  min-width: 0;
}
.brand-class {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.1em;
  white-space: nowrap;
}
.brand-sub::before {
  content: "·";
  margin-right: 0.55em;
  color: var(--ink-faint);
}
.dateline {
  display: flex;
  align-items: baseline;
  gap: 0.7em;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.dateline .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.55;
  transform: translateY(-0.25em);
}
.badge {
  padding: 0.1em 0.6em;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.78em;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

/* ------------------------------ 主体 ------------------------------ */
.stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(16px, 3vh, 48px) 0;
}

.quote-wrap {
  position: relative;
  max-width: min(86vw, 1500px);
  padding: 0 clamp(0px, 2.4vw, 64px);
  transition: opacity 0.8s ease;
}
.quote-wrap.is-hidden {
  opacity: 0;
}

.quote-text {
  margin: 0;
  font-family: var(--quote-font);
  font-weight: 500;
  font-size: clamp(2rem, 6vw, 6.6rem);
  line-height: 1.42;
  letter-spacing: 0.03em;
  color: var(--ink);
  text-wrap: pretty;
}

.quote-attrib {
  margin: clamp(16px, 2.6vh, 44px) 0 0;
  font-size: clamp(0.95rem, 1.45vw, 1.9rem);
  color: var(--ink-soft);
  letter-spacing: 0.12em;
}
.quote-attrib:empty {
  display: none;
}

.mark {
  position: absolute;
  font-family: var(--quote-font);
  color: var(--mark);
  opacity: 0.5;
  line-height: 1;
  user-select: none;
  pointer-events: none;
  font-size: clamp(72px, 9vw, 180px);
}
.mark-open {
  left: -0.05em;
  top: -0.32em;
}
.mark-close {
  right: -0.05em;
  bottom: -0.62em;
}
@media (max-width: 900px), (max-height: 520px) {
  .mark {
    display: none;
  }
}

/* ------------------------------ 底栏 ------------------------------ */
.footerbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 2.5rem;
  flex-wrap: wrap;
  padding-top: clamp(12px, 2vh, 26px);
  border-top: 1px solid var(--line);
  font-size: clamp(13px, 1.05vw, 20px);
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}
.foot-group {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 44px);
  flex-wrap: wrap;
}
.foot-countdown {
  color: var(--accent-ink);
  font-variant-numeric: tabular-nums;
}
.foot-item:empty {
  display: none;
}

/* 小屏（手机预览）少量适配 */
@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .quote-text {
    font-size: clamp(1.6rem, 8.4vw, 3rem);
  }
}