/* 通天路 · 首页瀑布流（对齐顶栏 max-w-7xl，非 full-bleed）— 绘制轻量 */
:root {
  --hw-gap: 0.75rem;
  --hw-col-target: 17.5rem; /* ~280px：多列固定观感，不碎不撑满 */
  --hw-col-min: 15rem;      /* 最小可读列宽 */
  --hw-radius: 0.75rem;
  --hw-cover-placeholder: 4 / 3;
  --hw-cover-max: 22rem;
}

/* 与顶栏 / site-shell 同宽：沿用 max-w-7xl + px-4/sm:px-6/lg:px-8，不做 full-bleed */
body:has(.home-waterfall-page) .site-main {
  padding-bottom: 2.5rem;
}

.home-waterfall-page {
  width: 100%;
  max-width: 100%;
  margin-inline: 0;
  padding-inline: 0;
  padding-block: 0.15rem 1rem;
  box-sizing: border-box;
}

.home-waterfall-chrome {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.65rem 1rem;
  margin: 0 0 0.85rem;
  max-width: none;
  padding: 0.25rem 0 0.45rem;
}

.home-waterfall-chrome h1 {
  margin: 0;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--foreground);
}

.home-waterfall-chrome p,
.home-waterfall-lead {
  margin: 0.2rem 0 0;
  font-size: 0.8125rem;
  color: var(--muted-foreground);
}

.home-waterfall-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.home-waterfall-tools a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-height: 2.75rem; /* P0-5: 44px touch target */
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  color: var(--muted-foreground);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 120ms ease, background 120ms ease, border-color 120ms ease;
}

.home-waterfall-tools a:hover {
  color: var(--foreground);
  background: color-mix(in srgb, var(--muted) 45%, transparent);
}

.home-waterfall-tools a.is-active {
  color: var(--foreground);
  font-weight: 600;
  background: color-mix(in srgb, var(--brand-gold-soft) 42%, var(--card));
  border-color: color-mix(in srgb, var(--brand-gold) 28%, var(--border));
}

.home-waterfall-tools a.hw-cta {
  font-weight: 600;
  color: var(--primary-foreground);
  background: var(--primary);
  border-color: var(--primary);
}

/* 瀑布容器：JS 绝对定位补位 */
.home-waterfall {
  position: relative;
  width: 100%;
  min-height: 12rem;
  contain: layout style;
}

/* 不做 top/left 过渡：补位时动画布局属性会拖垮帧率 */
.home-waterfall-card {
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  margin: 0;
  overflow: hidden;
  border-radius: var(--hw-radius);
  border: 1px solid color-mix(in srgb, var(--border) 80%, #8a6a3a 12%);
  background: var(--card);
  /* 单层轻阴影，覆盖 .topic-slip / .brand-card 多层 glow */
  box-shadow: 0 1px 2px rgb(42 33 24 / 0.06);
  opacity: 0;
  transform: none !important;
  transition: opacity 260ms ease, border-color 120ms ease !important;
  break-inside: auto;
  /* 不用 content-visibility：绝对定位量高时会读到 intrinsic 占位高 */
  contain: layout style;
}

.home-waterfall-card.is-visible {
  opacity: 1;
}

.home-waterfall-card:hover {
  border-color: var(--border);
  box-shadow: 0 2px 8px -2px rgb(42 33 24 / 0.12);
  transform: none !important;
  transition: opacity 260ms ease, border-color 120ms ease, box-shadow 120ms ease !important;
}

.home-waterfall-card[data-span="2"] {
  border-color: var(--border);
  background: var(--card);
  box-shadow: inset 4px 0 0 var(--brand-gold);
}

.home-waterfall-card[data-span="2"]:hover {
  border-color: var(--border);
  box-shadow: inset 4px 0 0 var(--brand-gold), 0 2px 8px -2px rgb(42 33 24 / 0.12);
}

/* 关掉纸条/3D 残留层：伪元素高光、重阴影、hover 位移 */
.home-waterfall-card.topic-slip::after,
.home-waterfall-card.brand-card::after {
  content: none !important;
  display: none !important;
}

.home-waterfall-card .topic-slip-rail {
  display: none;
}

.home-waterfall-card .hw-card-hit,
.home-waterfall-card .topic-slip-hit {
  position: absolute;
  inset: 0;
  z-index: 2;
  border-radius: inherit;
  text-indent: -9999px;
  overflow: hidden;
  color: transparent;
}

.home-waterfall-card .hw-card-hit:focus-visible,
.home-waterfall-card .topic-slip-hit:focus-visible {
  outline: 2px solid var(--ring, var(--brand-gold-strong));
  outline-offset: 2px;
  text-indent: 0;
}

/* 有图：占位比例 → load 后钳制 aspect-ratio；cover 铺满避免竖图两侧留白 */
.home-waterfall-card .hw-cover {
  display: block;
  position: relative;
  width: 100%;
  overflow: hidden;
  background: color-mix(in srgb, var(--muted) 35%, var(--card));
}

.home-waterfall-card .hw-cover::before {
  content: "";
  position: absolute;
  inset: -12%;
  background-image: var(--hw-cover-blur, none);
  background-size: cover;
  background-position: center;
  filter: blur(18px) saturate(1.05);
  opacity: 0.45;
  transform: scale(1.08);
  pointer-events: none;
  z-index: 0;
}

.home-waterfall-card .hw-cover-inner {
  display: block;
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: var(--hw-cover-placeholder);
  max-height: var(--hw-cover-max);
  overflow: hidden;
}

.home-waterfall-card .hw-cover-img {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-height: var(--hw-cover-max);
  object-fit: cover;
  object-position: center top;
  border-radius: var(--hw-radius) var(--hw-radius) 0 0;
}

/* 纯文字排版封面 */
.home-waterfall-card .hw-cover-text {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.35rem;
  width: 100%;
  aspect-ratio: 4 / 5;
  max-height: var(--hw-cover-max);
  padding: 1rem 0.9rem 0.85rem;
  border-radius: var(--hw-radius) var(--hw-radius) 0 0;
  background:
    radial-gradient(120% 80% at 12% 0%, color-mix(in srgb, var(--primary) 22%, transparent), transparent 55%),
    linear-gradient(
      165deg,
      color-mix(in srgb, var(--muted) 55%, var(--card)) 0%,
      color-mix(in srgb, var(--card) 88%, var(--foreground)) 100%
    );
  color: var(--foreground);
}
.home-waterfall-card[data-tone="1"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 88% 8%, color-mix(in srgb, #2f6f5e 28%, transparent), transparent 50%),
    linear-gradient(165deg, color-mix(in srgb, #dce8e2 70%, var(--card)), var(--card));
}
.home-waterfall-card[data-tone="2"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 10% 10%, color-mix(in srgb, #8a5a2b 24%, transparent), transparent 52%),
    linear-gradient(165deg, color-mix(in srgb, #efe2d2 75%, var(--card)), var(--card));
}
.home-waterfall-card[data-tone="3"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 90% 0%, color-mix(in srgb, #3d5a80 26%, transparent), transparent 55%),
    linear-gradient(165deg, color-mix(in srgb, #d9e3ef 70%, var(--card)), var(--card));
}
.home-waterfall-card[data-tone="4"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 20% 0%, color-mix(in srgb, #6b4f7a 22%, transparent), transparent 50%),
    linear-gradient(165deg, color-mix(in srgb, #e8dde9 70%, var(--card)), var(--card));
}
.home-waterfall-card[data-tone="5"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 80% 10%, color-mix(in srgb, #6a7a3d 24%, transparent), transparent 52%),
    linear-gradient(165deg, color-mix(in srgb, #e4e9d6 72%, var(--card)), var(--card));
}

/* §4-4: tones stay legible in dark — tint the dark base with the tone accent
   (light pastels above would glare on the #090806 background) */
html.dark .home-waterfall-card[data-tone="1"] .hw-cover-text,
[data-theme="dark"] .home-waterfall-card[data-tone="1"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 88% 8%, color-mix(in srgb, #7fb8a4 22%, transparent), transparent 50%),
    linear-gradient(165deg, color-mix(in srgb, #2f6f5e 30%, var(--card)), var(--card));
}
html.dark .home-waterfall-card[data-tone="2"] .hw-cover-text,
[data-theme="dark"] .home-waterfall-card[data-tone="2"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 10% 10%, color-mix(in srgb, #c08a54 22%, transparent), transparent 52%),
    linear-gradient(165deg, color-mix(in srgb, #8a5a2b 30%, var(--card)), var(--card));
}
html.dark .home-waterfall-card[data-tone="3"] .hw-cover-text,
[data-theme="dark"] .home-waterfall-card[data-tone="3"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 90% 0%, color-mix(in srgb, #7d9cc4 22%, transparent), transparent 55%),
    linear-gradient(165deg, color-mix(in srgb, #3d5a80 32%, var(--card)), var(--card));
}
html.dark .home-waterfall-card[data-tone="4"] .hw-cover-text,
[data-theme="dark"] .home-waterfall-card[data-tone="4"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 20% 0%, color-mix(in srgb, #a98cc0 20%, transparent), transparent 50%),
    linear-gradient(165deg, color-mix(in srgb, #6b4f7a 30%, var(--card)), var(--card));
}
html.dark .home-waterfall-card[data-tone="5"] .hw-cover-text,
[data-theme="dark"] .home-waterfall-card[data-tone="5"] .hw-cover-text {
  background:
    radial-gradient(120% 80% at 80% 10%, color-mix(in srgb, #a3b46a 20%, transparent), transparent 52%),
    linear-gradient(165deg, color-mix(in srgb, #6a7a3d 30%, var(--card)), var(--card));
}
.home-waterfall-card .hw-cover-text-kicker {
  font-size: 0.65rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}
.home-waterfall-card .hw-cover-text-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.home-waterfall-card .hw-body {
  position: relative;
  z-index: 1;
  padding: 0.7rem 0.8rem 0.8rem;
  min-width: 0;
  overflow: hidden;
}

.home-waterfall-card .hw-title {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 650;
  line-height: 1.4;
  color: var(--foreground);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  overflow: hidden;
  max-height: none;
}

.home-waterfall-card[data-span="2"] .hw-title {
  font-size: 1.05rem;
  -webkit-line-clamp: 5;
}

.home-waterfall-card .hw-excerpt-pc,
.home-waterfall-card .topic-slip-excerpt {
  margin: 0.4rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--muted-foreground);
  word-break: break-word;
  white-space: pre-line;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  max-height: none;
  pointer-events: none;
}

.home-waterfall-card:not([data-has-cover="1"]) .hw-excerpt-pc,
.home-waterfall-card:not([data-has-cover="1"]) .topic-slip-excerpt {
  -webkit-line-clamp: 3;
}

.home-waterfall-card .topic-slip-meta-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
  min-height: 1.1rem;
}

.home-waterfall-card .hw-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
  margin-top: 0.55rem;
  padding-top: 0.55rem;
  border-top: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
  min-width: 0;
  overflow: hidden;
}

.home-waterfall-card .hw-footer .user-identity {
  flex: 1 1 0;
  min-width: 0;
  max-width: 58%;
  overflow: hidden;
}

.home-waterfall-card .hw-footer .user-name {
  min-width: 0;
  overflow: hidden;
}

.home-waterfall-card .hw-meta-end {
  margin: 0;
  flex: 0 1 auto;
  min-width: 3.25rem;
  max-width: 42%;
  overflow: hidden;
  text-align: right;
  font-size: 0.6875rem;
  line-height: 1.35;
  color: var(--muted-foreground);
}

.home-waterfall-card .hw-meta-board {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: keep-all;
}

.home-waterfall-status {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 0 0.5rem;
  font-size: 0.8125rem;
  color: var(--muted-foreground);
}

.home-waterfall-empty {
  margin: 1rem auto;
  max-width: 28rem;
  border-radius: var(--hw-radius);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 2rem 1.25rem;
  text-align: center;
}

/* 首页置顶：发现流上方，运营活动 / 强制通知 */
.home-official-rail {
  margin: 0 0 1.25rem;
  padding: 0.85rem 0 1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: transparent;
  border-radius: 0;
}

.home-official-rail--solo {
  margin-top: 0.25rem;
  margin-bottom: 0;
  max-width: none;
  border-bottom: none;
  padding-bottom: 0;
}

.home-official-rail__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
  margin-bottom: 0.75rem;
}

.home-official-rail__title {
  display: block;
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  color: var(--foreground);
}

.home-official-rail__hint {
  display: block;
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

.home-official-rail__track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
}

@media (min-width: 640px) {
  .home-official-rail__track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .home-official-rail__track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.home-official-card.home-waterfall-card {
  position: relative;
  width: 100%;
  margin: 0;
  left: auto !important;
  top: auto !important;
  transform: none !important;
  border-color: color-mix(in srgb, var(--brand-gold, var(--primary)) 18%, var(--border));
  box-shadow: none;
  overflow: hidden;
}

.home-official-card .hw-cover {
  border-radius: 0;
}

.home-official-card .hw-title,
.home-official-card .topic-slip-title {
  font-size: 0.9375rem;
  line-height: 1.35;
  -webkit-line-clamp: 2;
  font-weight: 650;
}

.home-official-card .hw-excerpt-pc,
.home-official-card .topic-slip-excerpt {
  display: none;
}

.home-official-card .hw-footer {
  display: none;
}

.home-official-card .hw-meta-end {
  display: none;
}

.topic-slip-kind--official {
  background: color-mix(in srgb, var(--brand-gold, var(--primary)) 16%, transparent);
  color: var(--brand-gold-strong, var(--primary));
  font-weight: 650;
}

html.dark .home-official-rail,
[data-theme="dark"] .home-official-rail {
  background: transparent;
  border: none;
}

html.dark .home-waterfall-card,
[data-theme="dark"] .home-waterfall-card {
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.35);
}

html.dark .home-waterfall-card:hover,
[data-theme="dark"] .home-waterfall-card:hover {
  box-shadow: 0 2px 10px -2px rgb(0 0 0 / 0.5);
}

html.dark .home-waterfall-card[data-span="2"]:hover,
[data-theme="dark"] .home-waterfall-card[data-span="2"]:hover {
  box-shadow: inset 4px 0 0 var(--brand-gold), 0 2px 10px -2px rgb(0 0 0 / 0.5);
}

@media (prefers-reduced-motion: reduce) {
  .home-waterfall-tools a,
  .home-waterfall-card {
    transition: none !important;
  }
}

.home-waterfall.hw-reduced-motion .home-waterfall-card {
  transition: none !important;
}