/* ==========================================================================
   通天路 · 首页改版（2026-09-17）— 页面级样式
   仅 home.html {% block extra_head %} 引用（在 home-waterfall.css 之后）。
   瀑布内部（卡片/绝对定位/打包）仍由 home-waterfall.css 负责。
   约束：颜色全部走主题变量（--brand-* / --card / --border / --muted / --ring）；
   零外部图片 / 字体 / CDN；动效 150–200ms；尊重 prefers-reduced-motion。
   参考：docs/qa/home-redesign-20260917/ui-spec.md
   ========================================================================== */

/* ---- Hero 主题 token（亮色） -------------------------------------------- */
:root {
  --hero-sky-top: color-mix(in srgb, var(--brand-gold-soft) 64%, var(--card));
  --hero-sky-mid: color-mix(in srgb, var(--brand-gold) 18%, var(--card));
  --hero-sky-low: color-mix(in srgb, var(--brand-rust) 16%, var(--brand-gold-soft));
  --hero-sun: color-mix(in srgb, var(--brand-gold) 46%, var(--card));
  --hero-ridge-far: color-mix(in srgb, var(--brand-blue) 26%, var(--card));
  --hero-ridge-mid: color-mix(in srgb, var(--brand-moss) 30%, var(--brand-blue));
  --hero-ridge-near: color-mix(in srgb, var(--foreground) 66%, var(--brand-moss));
  --hero-ink: var(--foreground);
  --hero-ink-soft: color-mix(in srgb, var(--foreground) 72%, transparent);
  /* 唯一允许的常量 hex：照片模式 scrim 恒为暗，与主题无关（亮/暗同值）。 */
  --home-on-photo: #fff8e8;
}

html.dark,
[data-theme="dark"],
:root.dark {
  --hero-sky-top: color-mix(in srgb, var(--brand-gold-soft) 62%, var(--background));
  --hero-sky-mid: color-mix(in srgb, var(--brand-blue) 22%, var(--background));
  --hero-sky-low: color-mix(in srgb, var(--brand-rust) 14%, var(--background));
  --hero-sun: color-mix(in srgb, var(--brand-gold) 34%, var(--background));
  --hero-ridge-far: color-mix(in srgb, var(--brand-blue) 34%, var(--card));
  --hero-ridge-mid: color-mix(in srgb, var(--brand-moss) 26%, var(--card));
  --hero-ridge-near: color-mix(in srgb, var(--brand-ink) 78%, var(--brand-moss));
  --hero-ink: var(--foreground);
  --hero-ink-soft: color-mix(in srgb, var(--foreground) 80%, transparent);
}

/* ---- 页面纵向节奏 -------------------------------------------------------- */
.home-waterfall-page {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-block: 0 1rem;
}

@media (min-width: 640px) {
  .home-waterfall-page {
    gap: 1.75rem;
  }
}

/* hero + entry 视作一组 */
.home-top {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

@media (min-width: 640px) {
  .home-top {
    gap: 1rem;
  }
}

/* ==========================================================================
   1. 欢迎区（Hero）
   ========================================================================== */
.home-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: clamp(16rem, 24vw, 22rem);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  border-radius: 1.25rem;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  color: var(--hero-ink);
}

@media (min-width: 640px) {
  .home-hero {
    border-radius: 1.5rem;
  }
}

/* 背景 A：CSS 渐变 + 内联 SVG 山景（无外链资源） */
.home-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.home-hero__bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    var(--hero-sky-top) 0%,
    var(--hero-sky-mid) 58%,
    var(--hero-sky-low) 100%
  );
}

.home-hero__sun {
  position: absolute;
  right: 18%;
  top: 30%;
  width: clamp(3.5rem, 9vw, 6.5rem);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--hero-sun) 0%,
    color-mix(in srgb, var(--hero-sun) 40%, transparent) 52%,
    transparent 72%
  );
  filter: blur(2px);
}

.home-hero__ridges {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.home-hero__ridge--far {
  fill: var(--hero-ridge-far);
  opacity: 0.62;
}

.home-hero__ridge--mid {
  fill: var(--hero-ridge-mid);
  opacity: 0.78;
}

.home-hero__ridge--near {
  fill: var(--hero-ridge-near);
  opacity: 0.94;
}

/* 背景 B：配置图（home_hero_image 非空） */
.home-hero__photo {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center 42%;
}

.home-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    100deg,
    color-mix(in srgb, var(--brand-ink) 72%, transparent) 0%,
    color-mix(in srgb, var(--brand-ink) 48%, transparent) 44%,
    color-mix(in srgb, var(--brand-ink) 12%, transparent) 76%,
    transparent 100%
  );
}

.home-hero--photo {
  --hero-ink: var(--home-on-photo);
  --hero-ink-soft: color-mix(in srgb, var(--home-on-photo) 86%, transparent);
}

.home-hero--photo .home-hero__inner {
  text-shadow: 0 1px 3px rgb(0 0 0 / 45%);
}

/* 文本区 */
.home-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 0;
}

@media (min-width: 768px) {
  .home-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 1rem 1.5rem;
  }
}

.home-hero__copy {
  max-width: 34rem;
  min-width: 0;
}

.home-hero__greet {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--hero-ink-soft);
}

@media (min-width: 640px) {
  .home-hero__greet {
    font-size: 1rem;
  }
}

/* h1 衬线来自 headless.css 全局规则；此处只管尺寸/色 */
.home-hero__title {
  margin: 0.35rem 0 0;
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  line-height: 1.22;
  font-weight: 700;
  color: var(--hero-ink);
  overflow-wrap: anywhere;
}

.home-hero__sub {
  margin: 0.4rem 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  font-weight: 400;
  color: var(--hero-ink-soft);
  overflow-wrap: anywhere;
}

@media (min-width: 768px) {
  .home-hero__sub {
    font-size: 1rem;
  }
}

/* 手写标语观感：衬线栈 + 字距 + pre-line（无 CDN 字体，见 ui-spec §13 defer） */
.home-hero__tagline {
  margin: 0;
  padding-left: 0.75rem;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, serif;
  font-size: 0.9375rem;
  line-height: 1.9;
  font-weight: 500;
  letter-spacing: 0.12em;
  white-space: pre-line;
  color: color-mix(in srgb, var(--hero-ink) 82%, transparent);
}

.home-hero__tagline::before {
  content: "";
  display: block;
  width: 1.5rem;
  height: 2px;
  border-radius: 9999px;
  margin: 0 0 0.5rem;
  background: var(--brand-gold-strong);
}

@media (min-width: 768px) {
  .home-hero__tagline {
    padding-left: 0;
    max-width: 14rem;
    text-align: right;
    font-size: 1.0625rem;
  }

  .home-hero__tagline::before {
    margin-left: auto;
  }
}

@media (min-width: 1024px) {
  .home-hero__tagline {
    transform: rotate(-1.5deg);
  }
}

html.dark .home-hero__tagline::before,
[data-theme="dark"] .home-hero__tagline::before,
:root.dark .home-hero__tagline::before {
  background: var(--brand-gold);
}

/* ==========================================================================
   2. 我的通天路（4 入口卡 · 仅登录）
   ========================================================================== */
.home-entry {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  min-width: 0;
}

@media (min-width: 640px) {
  .home-entry {
    gap: 1rem;
  }
}

@media (min-width: 1024px) {
  .home-entry {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.home-entry-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 11rem;
  min-width: 0;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: var(--entry-surface, var(--card));
  transition: border-color 160ms ease, box-shadow 200ms ease, transform 200ms ease;
}

@media (min-width: 640px) {
  .home-entry-card {
    padding: 1.25rem;
  }
}

.home-entry-card:hover {
  transform: translateY(-1px);
  border-color: var(--border);
  background: color-mix(in srgb, var(--muted) 30%, var(--entry-surface, var(--card)));
  box-shadow: 0 2px 8px -2px rgb(42 33 24 / 0.12);
}

.home-entry-card:focus-within {
  border-color: var(--ring);
}

.home-entry-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  flex: none;
  border-radius: 9999px;
  background: color-mix(in srgb, var(--entry-accent, var(--muted)) 14%, var(--card));
  color: var(--entry-accent, var(--foreground));
}

.home-entry-title {
  margin: 0.25rem 0 0;
  font-size: 1rem;
  line-height: 1.35;
  font-weight: 650;
  color: var(--foreground);
}

.home-entry-sub {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.5;
  font-weight: 400;
  color: var(--muted-foreground);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.home-entry-cta {
  margin-top: auto;
  align-self: stretch;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  min-height: 2.75rem;
  padding-inline: 1rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: var(--muted);
  color: var(--foreground);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease;
}

/* 整卡可点：CTA 是唯一链接，::after 拉伸命中区（无嵌套交互） */
.home-entry-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.home-entry-cta:hover {
  background: color-mix(in srgb, var(--muted) 72%, var(--card));
  border-color: var(--border);
}

.home-entry-cta:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* 四色 tone（亮色）：只保留 icon 的强调色；卡片表面 = bg-card（shadcn 口径） */
.home-entry-card[data-tone="gold"] {
  --entry-accent: var(--brand-gold-strong);
  --entry-surface: var(--card);
}

.home-entry-card[data-tone="rust"] {
  --entry-accent: var(--brand-rust);
  --entry-surface: color-mix(in srgb, var(--brand-rust) 12%, var(--card));
}

.home-entry-card[data-tone="blue"] {
  --entry-accent: var(--brand-blue);
  --entry-surface: color-mix(in srgb, var(--brand-blue) 12%, var(--card));
}

.home-entry-card[data-tone="moss"] {
  --entry-accent: var(--brand-moss);
  --entry-surface: color-mix(in srgb, var(--brand-moss) 12%, var(--card));
}

/* 深色：accent 向 --foreground 提亮（暗色原值对比不足 4.5:1） */
html.dark .home-entry-card[data-tone="gold"],
[data-theme="dark"] .home-entry-card[data-tone="gold"],
:root.dark .home-entry-card[data-tone="gold"] {
  --entry-accent: var(--brand-gold);
  --entry-surface: var(--card);
}

html.dark .home-entry-card[data-tone="rust"],
[data-theme="dark"] .home-entry-card[data-tone="rust"],
:root.dark .home-entry-card[data-tone="rust"] {
  --entry-accent: color-mix(in srgb, var(--brand-rust) 52%, var(--foreground));
  --entry-surface: color-mix(in srgb, var(--brand-rust) 18%, var(--card));
}

html.dark .home-entry-card[data-tone="blue"],
[data-theme="dark"] .home-entry-card[data-tone="blue"],
:root.dark .home-entry-card[data-tone="blue"] {
  --entry-accent: color-mix(in srgb, var(--brand-blue) 52%, var(--foreground));
  --entry-surface: color-mix(in srgb, var(--brand-blue) 18%, var(--card));
}

html.dark .home-entry-card[data-tone="moss"],
[data-theme="dark"] .home-entry-card[data-tone="moss"],
:root.dark .home-entry-card[data-tone="moss"] {
  --entry-accent: color-mix(in srgb, var(--brand-moss) 52%, var(--foreground));
  --entry-surface: color-mix(in srgb, var(--brand-moss) 18%, var(--card));
}

/* ==========================================================================
   3. 为你推荐（横排卡 · 仅登录）
   ========================================================================== */
.home-reco {
  min-width: 0;
}

.home-reco__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.home-reco__head h2 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.35;
  font-weight: 650;
  color: var(--foreground);
}

@media (min-width: 768px) {
  .home-reco__head h2 {
    font-size: 1.375rem;
    font-weight: 700;
  }
}

.home-reco__kicker {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted-foreground);
}

.home-reco__wrap {
  position: relative;
  min-width: 0;
}

.home-reco__scroller {
  display: grid;
  grid-auto-flow: column;
  gap: 0.75rem;
  grid-auto-columns: minmax(16rem, 78%);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 0.25rem;
  scrollbar-width: none;
  padding: 0.25rem;
  margin: -0.25rem;
}

.home-reco__scroller::-webkit-scrollbar {
  display: none;
}

.home-reco__scroller > * {
  scroll-snap-align: start;
}

.home-reco__scroller:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

@media (min-width: 640px) {
  .home-reco__scroller {
    grid-auto-columns: minmax(17rem, 1fr);
  }
}

@media (min-width: 1024px) {
  .home-reco__scroller {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-flow: row;
    overflow: visible;
  }
}

.home-reco__nav {
  position: absolute;
  right: -0.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  gap: 0.5rem;
}

@media (min-width: 768px) {
  .home-reco__nav {
    display: flex;
  }

  .home-reco__nav[data-hidden="1"] {
    display: none;
  }
}

.home-reco__nav button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--foreground);
  box-shadow: 0 1px 3px rgb(42 33 24 / 0.12);
  transition: background-color 160ms ease, border-color 160ms ease;
}

.home-reco__nav button:hover:not(:disabled) {
  background: color-mix(in srgb, var(--muted) 55%, var(--card));
  border-color: var(--border);
}

.home-reco__nav button:disabled {
  opacity: 0.4;
  cursor: default;
}

.home-reco__nav button:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* 推荐卡壳 */
.home-reco-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 12rem;
  min-width: 0;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: var(--card);
  transition: border-color 160ms ease, box-shadow 200ms ease, transform 200ms ease;
}

.home-reco-card:hover {
  transform: translateY(-1px);
  border-color: var(--border);
  box-shadow: 0 2px 8px -2px rgb(42 33 24 / 0.12);
}

.home-reco-card:focus-within {
  border-color: var(--ring);
}

.home-reco-card__kicker {
  margin: 0;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted-foreground);
}

.home-reco-card__title {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 650;
  line-height: 1.45;
  color: var(--foreground);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.home-reco-card__meta {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted-foreground);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-reco-card__cta {
  margin-top: auto;
  align-self: stretch;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  min-height: 2.75rem;
  padding-inline: 1rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: var(--muted);
  color: var(--foreground);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.home-reco-card__cta:hover {
  background: color-mix(in srgb, var(--muted) 72%, var(--card));
  border-color: var(--border);
}

.home-reco-card__cta:focus-visible,
.home-reco-board:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* 本期精选：封面 + 标题 */
.home-reco-card__cover {
  border-radius: 0.5rem;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  max-height: 6rem;
  background: color-mix(in srgb, var(--muted) 45%, var(--card));
}

.home-reco-card__cover img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* 你关注的更新 */
.home-reco-updates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  min-width: 0;
}

.home-reco-updates li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.home-reco-updates__title {
  min-width: 0;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--foreground);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-reco-card__foot {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

.home-reco-card__empty-title {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--foreground);
}

.home-reco-card__empty-sub {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--muted-foreground);
}

/* 可能感兴趣的圈子 */
.home-reco-boards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
  min-width: 0;
}

.home-reco-board {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  text-decoration: none;
  border-radius: 0.5rem;
}

.home-reco-board__thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  border-radius: 0.5rem;
  overflow: hidden;
  background: color-mix(in srgb, var(--muted) 60%, var(--card));
  color: var(--brand-gold-strong);
  font-size: 0.875rem;
  font-weight: 650;
}

.home-reco-board__thumb img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.home-reco-board__name {
  font-size: 0.6875rem;
  line-height: 1.4;
  color: var(--muted-foreground);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

html.dark .home-reco-board__thumb,
[data-theme="dark"] .home-reco-board__thumb,
:root.dark .home-reco-board__thumb {
  color: var(--brand-gold);
}

/* 每日一句 */
.home-reco-card__quote-icon {
  position: absolute;
  top: 0.9rem;
  right: 1rem;
  color: var(--brand-gold-strong);
}

html.dark .home-reco-card__quote-icon,
[data-theme="dark"] .home-reco-card__quote-icon,
:root.dark .home-reco-card__quote-icon {
  color: var(--brand-gold);
}

.home-reco-quote {
  margin: 0.25rem 0 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, serif;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--foreground);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.home-reco-quote__source {
  margin: 0.375rem 0 0;
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

/* ==========================================================================
   4. 社区更新（head + tabs + chips + feed + rail）
   ========================================================================== */
.home-community {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.home-community__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1rem;
}

.home-community__head h2 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.35;
  font-weight: 650;
  color: var(--foreground);
}

@media (min-width: 768px) {
  .home-community__head h2 {
    font-size: 1.375rem;
    font-weight: 700;
  }
}

.home-community__kicker {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted-foreground);
}

@media (max-width: 767.98px) {
  .home-community__head {
    flex-direction: column;
    align-items: stretch;
  }
}

/* tabs 胶囊（SSR 链接） */
.home-tabs {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.375rem;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.home-tabs::-webkit-scrollbar {
  display: none;
}

.home-tabs a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: 1rem;
  border-radius: 9999px;
  border: 1px solid transparent;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted-foreground);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

.home-tabs a:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.home-tabs a[aria-current="page"] {
  color: var(--primary-foreground);
  background: var(--primary);
  border-color: var(--primary);
}

/* chips 胶囊（forum 过滤） */
.home-chips {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
  /* #000 是透明度蒙版常量，非主题色（仓库既有用法） */
  mask-image: linear-gradient(90deg, transparent 0, #000 0.75rem, #000 calc(100% - 0.75rem), transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 0.75rem, #000 calc(100% - 0.75rem), transparent);
}

.home-chips::-webkit-scrollbar {
  display: none;
}

.home-chips a {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: 0.9rem;
  border-radius: 9999px;
  border: 1px solid transparent;
  font-size: 0.8125rem;
  color: var(--muted-foreground);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

.home-chips a:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* 当前 chip = muted 底 + 前景字（shadcn：选中态用背景，不用彩色描边） */
.home-chips a.is-active {
  color: var(--foreground);
  font-weight: 600;
  background: var(--muted);
  border-color: transparent;
}

/* 两栏：feed + rail（DOM 顺序 rail 在前 → 移动端热门条在 feed 上方） */
.home-community__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  min-width: 0;
}

.home-community__main {
  min-width: 0;
}

@media (min-width: 1024px) {
  /* 仅当 rail 存在（登录）才两栏：游客无右栏，feed/空态保持全宽（避免 20rem 空列） */
  .home-community__body:has(.home-rail) {
    grid-template-columns: minmax(0, 1fr) 20rem;
    gap: 1.5rem;
    align-items: start;
  }

  .home-community__body:has(.home-rail) .home-community__main {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .home-community__body:has(.home-rail) .home-rail {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }
}

/* ==========================================================================
   5. 右栏（热门话题 + 加入圈子）
   ========================================================================== */
.home-rail {
  display: grid;
  gap: 0.75rem;
  min-width: 0;
}

@media (min-width: 640px) and (max-width: 1023.98px) {
  .home-rail {
    /* auto-fit：join 卡 <1024 隐藏时，热门卡不被压成半宽 */
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
    gap: 1rem;
  }
}

@media (min-width: 1024px) {
  /* 桌面：rail 随页面自然滚动 — 不 sticky、不内部滚动。
     rail 实际高度常超过视口（发现页 4 卡合计 >1000px），sticky + max-height
     会裁切底部卡片并出现独立滚动条（观感：超出视口边界）。
     align-self: start 保留：grid 行高由主列决定，rail 不被拉伸。 */
  .home-rail {
    display: grid;
    gap: 1rem;
    align-self: start;
  }
}

.home-rail-card {
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: var(--card);
  padding: 1rem;
  box-shadow: 0 1px 2px rgb(42 33 24 / 0.06);
  min-width: 0;
}

@media (min-width: 640px) {
  .home-rail-card {
    padding: 1.25rem;
  }
}

.home-rail-card__title {
  margin: 0 0 0.5rem;
  font-size: 0.9375rem;
  font-weight: 650;
  color: var(--foreground);
}

.home-topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.home-topic-list li {
  min-width: 0;
}

.home-topic-list li + li {
  border-top: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}

.home-topic-list a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding-inline: 0.375rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: background-color 160ms ease;
}

.home-topic-list a:hover {
  background: color-mix(in srgb, var(--muted) 40%, transparent);
}

.home-topic-list a:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.home-topic-list__icon {
  flex: none;
  color: var(--brand-gold-strong);
}

html.dark .home-topic-list__icon,
[data-theme="dark"] .home-topic-list__icon,
:root.dark .home-topic-list__icon {
  color: var(--brand-gold);
}

.home-topic-list__label {
  min-width: 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--foreground);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-topic-list__meta {
  margin-left: auto;
  flex: none;
  font-size: 0.75rem;
  color: var(--muted-foreground);
  font-variant-numeric: tabular-nums;
}

/* <1024：热门话题横滑胶囊条（rail 在 feed 之前） */
@media (max-width: 1023.98px) {
  .home-topic-list {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    padding-bottom: 0.125rem;
  }

  .home-topic-list::-webkit-scrollbar {
    display: none;
  }

  .home-topic-list li {
    flex: 0 0 auto;
  }

  .home-topic-list li + li {
    border-top: none;
  }

  .home-topic-list a {
    min-height: 2.5rem;
    padding-inline: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 9999px;
    background: var(--card);
  }

  .home-topic-list__meta {
    margin-left: 0.375rem;
  }
}

@media (max-width: 639.98px) {
  .home-topic-list__meta {
    display: none;
  }
}

/* 加入圈子 CTA 卡：仅登录桌面右栏（ux-spec K10；移动端由「探索更多」承担） */
.home-join-card {
  display: none;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 1.25rem 1rem 1rem;
}

@media (min-width: 1024px) {
  .home-join-card {
    display: block;
  }
}

.home-join-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3.5rem;
  background: var(--hero-ridge-near);
  opacity: 0.16;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  pointer-events: none;
}

.home-join-card__text {
  position: relative;
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--foreground);
}

.home-join-card__cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  min-height: 2.75rem;
  margin-top: 0.75rem;
  padding-inline: 1.1rem;
  border-radius: 9999px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms ease;
}

.home-join-card__cta:hover {
  background: color-mix(in srgb, var(--primary) 90%, transparent);
}

.home-join-card__cta:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* ==========================================================================
   6. 底部三态 / 空态插图
   ========================================================================== */
.home-waterfall-hint {
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted-foreground);
}

.home-waterfall-hint::before,
.home-waterfall-hint::after {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: color-mix(in srgb, var(--border) 90%, transparent);
}

.home-empty-art {
  width: 100%;
  max-width: 22rem;
  height: 4.5rem;
  margin: 0 auto 1.25rem;
}

.home-empty-art svg {
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   7. 动效 · prefers-reduced-motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .home-entry-card,
  .home-entry-cta,
  .home-reco__scroller,
  .home-reco__nav button,
  .home-tabs a,
  .home-chips a,
  .home-topic-list a,
  .home-join-card__cta {
    transition: none !important;
    transform: none !important;
    animation: none !important;
  }

  .home-reco__scroller {
    scroll-behavior: auto !important;
  }

  .home-waterfall-status .animate-spin {
    animation: none !important;
  }
}