/* ============================================================
 * layout.css — 轨道、站、导航(桌面横向;移动降级见 responsive.css)
 * ============================================================ */

/* ---- 顶部导航 ---- */
.banner {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  padding: 0 var(--station-pad-x);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
@supports not (backdrop-filter: blur(8px)) {
  .banner { background: var(--color-bg); }
}

.station-nav {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.station-nav-link {
  font-size: var(--text-small);
  color: var(--color-ink-2);
  white-space: nowrap;
  transition: color 0.3s var(--ease-out);
}
.station-nav-link .nav-num { margin-right: 6px; }
.station-nav-link[aria-current="true"] {
  color: var(--color-ink);
  font-weight: 700;
}

.nav-current { display: none; } /* 移动端显示当前站名 */

/* 进度条 */
.progress {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  height: 2px;
  z-index: var(--z-progress);
  background: transparent;
}
.progress-bar {
  width: 0%;
  height: 100%;
  background: var(--color-ink);
  transition: width 0.2s linear;
}

/* ---- 轨道(桌面:横向滚动容器) ---- */
.track {
  height: 100vh;
  height: 100dvh;
  display: flex;
  overflow-x: scroll;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  overscroll-behavior: contain;
}

/* ---- 站 ---- */
.station {
  flex: 0 0 100vw;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.station-inner {
  width: 100%;
  max-width: 1120px;
  max-height: 100%;
  margin: 0 auto;
  padding: calc(var(--nav-h) + var(--space-3)) var(--station-pad-x) var(--space-4);
  /* 内容超高兜底:站内纵向滚动,绝不裁切信息 */
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.station-inner::-webkit-scrollbar { display: none; }

/* 站牌 + 标题(内容站,左对齐) */
.station-meta {
  font-size: var(--text-small);
  color: var(--color-ink-2);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-2);
}
.station-title {
  font-size: var(--text-display);
  font-weight: 100;
  letter-spacing: 0.02em;
  line-height: 1.3;
  margin-bottom: var(--space-3);
}

/* 入场 reveal(JS 添加 .is-visible) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}