:root {
  --bg: #f5f7fb;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --line: rgba(16, 24, 40, 0.08);
  --text: #0f172a;
  --muted: #667085;
  --accent: #0ea5e9;
  --accent-strong: #0284c7;
  --accent-soft: rgba(14, 165, 233, 0.12);
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
  --radius: 22px;
  --radius-sm: 16px;
  --zigzag-bg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160' fill='none'%3E%3Crect width='160' height='160' fill='%2300bb77'/%3E%3Cg stroke='%2300a768' stroke-opacity='0.24' stroke-width='18' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M-20 20L20 60L60 20L100 60L140 20L180 60'/%3E%3Cpath d='M-20 80L20 120L60 80L100 120L140 80L180 120'/%3E%3Cpath d='M-20 140L20 180L60 140L100 180L140 140L180 180'/%3E%3C/g%3E%3C/svg%3E");
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background:
    var(--zigzag-bg),
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.10), transparent 32%),
    radial-gradient(circle at 90% 10%, rgba(15, 118, 110, 0.09), transparent 25%),
    var(--bg);
  background-size: 160px 160px, auto, auto, auto;
  background-position: center top, center center, center center, center center;
  color: var(--text);
}

a { color: inherit; text-decoration: none; }

.shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 16px;
  height: fit-content;
  max-height: calc(100vh - 32px);
  padding: 22px 14px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 28px;
  box-shadow: var(--shadow);
  overflow: auto;
}

.sidebar__brand,
.mobile-topbar__brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  font-weight: 800;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: var(--shadow);
}

.brand-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand-subtitle,
.sidebar__lead,
.section__head p,
.hero p,
.footer {
  color: var(--muted);
}

.sidebar__lead {
  margin: 16px 0 14px;
  line-height: 1.7;
  font-size: 0.95rem;
}

.sidebar__nav {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.sidebar__link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.56);
  font-weight: 700;
  color: #1e293b;
  transition: 160ms ease;
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.04);
}

.sidebar__link:hover,
.sidebar__link.is-active {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(14, 165, 233, 0.18);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
}

.sidebar__icon {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  flex: 0 0 20px;
  color: var(--muted);
}

.sidebar__icon svg {
  width: 100%;
  height: 100%;
}

.sidebar__label {
  min-width: 0;
}

.content {
  --content-pad: 28px;
  min-width: 0;
  padding: 28px 28px 40px;
}

.mobile-topbar {
  display: none;
}

.hero,
.section {
  margin-bottom: 28px;
}

.hero {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  align-items: start;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.hero__copy {
  display: grid;
  gap: 16px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section__head h1,
.section__head h2,
.single__header h1 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-size: clamp(1.8rem, 2.4vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  padding: 4px 0 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.hero h1 { font-size: clamp(2rem, 3vw, 3.8rem); }

.hero p {
  max-width: 62ch;
  margin: 0;
  line-height: 1.8;
  font-size: 1.02rem;
}

.search-launch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: #475569;
  font: inherit;
  font-weight: 700;
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.06);
  cursor: pointer;
}

.search-launch--desktop {
  min-width: min(100%, 320px);
  justify-content: flex-start;
  color: #94a3b8;
}

.search-launch:hover {
  border-color: rgba(14, 165, 233, 0.24);
  color: var(--text);
}

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
}

.search-modal[hidden] {
  display: none;
}

.search-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.38);
  backdrop-filter: blur(8px);
}

.search-modal__panel {
  position: relative;
  z-index: 1;
  width: min(900px, calc(100vw - 32px));
  margin: 6vh auto 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 30px 90px rgba(15, 23, 42, 0.18);
}

.search-modal__bar {
  display: flex;
  gap: 10px;
  align-items: center;
}

.search-modal__input {
  flex: 1;
  min-width: 0;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(248, 250, 252, 0.98);
  font: inherit;
  color: var(--text);
}

.search-modal__input:focus {
  outline: 2px solid rgba(14, 165, 233, 0.16);
  border-color: rgba(14, 165, 233, 0.24);
}

.search-modal__close {
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.search-modal__hint {
  margin: 12px 2px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.search-modal__results {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  max-height: min(62vh, 680px);
  overflow: auto;
  padding-right: 2px;
}

body.search-open {
  overflow: hidden;
}

.mobile-search,
.mobile-menu__toggle {
  appearance: none;
}

.mobile-menu__toggle {
  display: grid;
  gap: 2.5px;
  width: 38px;
  height: 38px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
  cursor: pointer;
  color: #475569;
}

.mobile-menu__icon {
  width: 16px;
  height: 16px;
}

.mobile-search {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
  display: grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
}

.mobile-search span {
  position: relative;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.2px solid #475569;
  background: transparent;
}

.mobile-search span::after {
  content: "";
  position: absolute;
  right: -2px;
  bottom: -3px;
  width: 5px;
  height: 1px;
  border-radius: 999px;
  background: #475569;
  transform: rotate(45deg);
}

.hero__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero__stat {
  padding: 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fff, #f8fbff);
  border: 1px solid var(--line);
}

.hero__stat span,
.card__footer time {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
}

.hero__stat strong {
  display: block;
  margin-top: 10px;
  font-size: 1.25rem;
}

.section__head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 16px;
}

.section__head h2,
.section__head h1 {
  font-size: clamp(1.35rem, 2vw, 2rem);
}

.feature-card {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: 214px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--feature-bg, linear-gradient(135deg, #dbeafe, #eff6ff));
  box-shadow: var(--shadow);
}

.feature-card__visual {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 18%, rgba(255,255,255,0.42), transparent 28%),
    radial-gradient(circle at 80% 24%, rgba(255,255,255,0.24), transparent 24%),
    var(--feature-bg, linear-gradient(135deg, #dbeafe, #eff6ff));
  filter: saturate(1.05);
}

.feature-card__visual::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.26));
}

.feature-card__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
}

.feature-card__title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 12ch;
  line-height: 1.15;
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #0f172a;
}

.featured-carousel {
  display: none;
}

.featured-grid {
  display: grid;
  gap: 7px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.featured-grid .feature-card {
  min-height: 206px;
}

.featured-carousel {
  margin-inline: calc(var(--content-pad) * -1);
  padding-inline: var(--content-pad);
  overflow-x: auto;
  overflow-y: visible;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: var(--content-pad);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.featured-carousel::-webkit-scrollbar {
  display: none;
}

.featured-carousel__track {
  display: flex;
  gap: 8px;
  align-items: stretch;
  width: max-content;
  min-width: 100%;
  padding: 8px 0 10px;
  perspective: 1400px;
  transform-style: preserve-3d;
}

.featured-carousel__slide {
  flex: 0 0 clamp(240px, 82vw, 360px);
  scroll-snap-align: center;
  scroll-snap-stop: always;
  transform-origin: center center;
  transition: transform 180ms ease, opacity 180ms ease, filter 180ms ease;
  will-change: transform, opacity, filter;
}

.feed {
  display: grid;
  gap: 7px;
}

.card__meta,
.card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.card,
.single {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.card {
  overflow: hidden;
}

.card {
  padding: 14px;
  border-radius: 10px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.96) 0%,
    rgba(255, 255, 255, 0.88) 70%,
    rgba(255, 255, 255, 0.72) 100%
  );
}

.card--featured {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.98) 0%,
    rgba(219, 234, 254, 0.92) 70%,
    rgba(186, 230, 253, 0.75) 100%
  );
  border-color: rgba(14, 165, 233, 0.16);
}

.card__meta,
.card__stats,
.card__footer,
.single__meta,
.single__footer {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.card__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  border-radius: inherit;
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

.card__title,
.card__summary,
.card__stats,
.card__unlock,
.card__meta,
.card__footer {
  position: relative;
  z-index: 1;
}

.card__meta {
  margin-bottom: 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.card__topic {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 6px;
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 0 2px 6px rgba(14, 165, 233, 0.25);
}

.card__topic::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
}

.card__badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  background: #fef3c7;
  color: #b45309;
  font-size: 0.7rem;
  font-weight: 700;
  border: 1px solid #fcd34d;
}

.badge,
.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge {
  background: #eef2ff;
  color: #334155;
}

.badge--accent {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.card__title {
  margin: 10px 0 8px;
  font-size: 1.08rem;
  line-height: 1.35;
}

.card__stats {
  color: var(--muted);
  font-size: 0.86rem;
}

.card__stats strong,
.card__unlock strong {
  color: var(--text);
  font-weight: 700;
}

.card__stats span,
.single__meta span {
  padding: 6px 9px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
}

.card__summary {
  margin: 0;
  line-height: 1.56;
  color: #334155;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.category-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  box-shadow: var(--shadow);
  font-weight: 700;
}

.category-card strong {
  color: var(--accent-strong);
}

.search-page__head {
  align-items: end;
}

.search-page__form {
  min-width: min(100%, 420px);
}

.search-page__meta {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
}

.search-page__meta strong {
  color: var(--text);
}

.search-results {
  display: grid;
  gap: 14px;
}

.search-result,
.search-empty {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.search-result {
  display: grid;
  gap: 8px;
}

.search-result__meta {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.search-result__title {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text);
}

.search-result__desc {
  color: #334155;
  line-height: 1.7;
}

.search-result__tags {
  color: var(--muted);
  font-size: 0.92rem;
}

.single {
  padding: 26px;
}

.single__header p {
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.8;
}

.single__meta {
  margin-top: 18px;
}

.single__body {
  padding: 18px 0 2px;
  line-height: 1.85;
}


.single__footer {
  padding-top: 18px;
  border-top: 1px solid var(--line);
  justify-content: space-between;
}

.comments {
  margin-top: 20px;
  padding-top: 24px;
  border-top: 1px solid rgba(16, 24, 40, 0.08);
}

.comments__head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 16px;
}

.comments__head h2 {
  margin: 4px 0 0;
  font-size: clamp(1.25rem, 1.6vw, 1.6rem);
}

.comments__hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.comments__panel {
  display: grid;
  gap: 18px;
}

.comments__list {
  display: grid;
  gap: 12px;
}

.comments__empty,
.comments__item {
  padding: 16px 18px;
  border: 1px solid rgba(16, 24, 40, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.comments__empty {
  margin: 0;
  color: var(--muted);
}

.comments__item {
  display: grid;
  gap: 10px;
}

.comments__meta {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.88rem;
}

.comments__meta strong {
  color: var(--text);
  font-size: 0.96rem;
}

.comments__content {
  margin: 0;
  color: #334155;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.comments__form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.comments__field {
  display: grid;
  gap: 8px;
}

.comments__field span {
  font-weight: 700;
  color: #334155;
}

.comments__field input,
.comments__field textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(16, 24, 40, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  font: inherit;
}

.comments__field textarea {
  resize: vertical;
  min-height: 140px;
}

.comments__field input:focus,
.comments__field textarea:focus {
  outline: 2px solid rgba(14, 165, 233, 0.16);
  border-color: rgba(14, 165, 233, 0.26);
}

.comments__field--full {
  grid-column: 1 / -1;
}

.comments__actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.comments__submit {
  appearance: none;
  padding: 13px 18px;
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 14px 28px rgba(14, 165, 233, 0.16);
}

.comments__submit:disabled {
  cursor: wait;
  opacity: 0.65;
}

.comments__status {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.comments__status[data-state="error"] {
  color: #b42318;
}

.tag {
  background: rgba(14, 165, 233, 0.12);
  color: var(--accent-strong);
}

.tag--soft {
  background: rgba(15, 23, 42, 0.06);
  color: #334155;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 6px 2px 0;
  font-size: 0.92rem;
}

@media (max-width: 1180px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .mobile-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(245, 247, 251, 0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
  }

  .mobile-topbar__brand {
    justify-self: center;
    gap: 10px;
    min-width: 0;
  }

  .mobile-topbar__brand .brand-subtitle {
    display: none;
  }

  .mobile-menu {
    position: relative;
  }

  .mobile-menu > summary {
    list-style: none;
  }

  .mobile-menu > summary::-webkit-details-marker {
    display: none;
  }

  .mobile-menu__panel {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    width: min(320px, calc(100vw - 32px));
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
  }

  .mobile-menu:not([open]) .mobile-menu__panel {
    display: none;
  }

  .mobile-menu__nav {
    display: grid;
    gap: 10px;
  }

  .mobile-menu__link {
    display: block;
    padding: 13px 14px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: rgba(248, 250, 252, 0.92);
    font-weight: 800;
  }

  .mobile-menu__link.is-active {
    border-color: rgba(14, 165, 233, 0.22);
    background: rgba(14, 165, 233, 0.1);
    color: var(--accent-strong);
  }

  .section .category-grid {
    margin-top: 4px;
  }

  .content {
    --content-pad: 16px;
    padding: 16px;
  }

  .hero,
  .category-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 22px;
  }

  .featured-grid--desktop {
    display: none;
  }

  .featured-carousel--mobile {
    display: block;
    position: relative;
    overflow: visible;
  }

  /* 移动端置顶文章：竖排三张卡片，无横滑 */
  .featured-carousel--mobile .featured-carousel__track {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px;
    padding: 0;
    overflow: visible;
    transform: none;
    width: 100% !important;
  }

  .featured-carousel--mobile .feature-card {
    min-height: 80px;
    padding: 14px 18px;
    border-radius: 14px;
    /* 换配色：深色实心 + 顶部彩色装饰条 */
    background: var(--panel-strong);
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow-sm);
    color: var(--text);
    align-items: center;
  }

  .featured-carousel--mobile .feature-card__visual {
    display: none;
  }

  .featured-carousel--mobile .feature-card__title {
    color: var(--text);
    font-size: 1rem;
    font-weight: 700;
    max-width: 100%;
    line-height: 1.35;
  }

  .featured-carousel--mobile .feature-card__subtitle {
    display: none;
  }

  .featured-carousel--mobile .featured-carousel__slide {
    flex: 0 0 auto;
    min-width: 0;
    width: 100%;
    align-self: stretch;
  }
}

@media (max-width: 720px) {
  /* 手机端单页内容区：紧凑布局，让半透明大框贴近手机边缘 */
  .content {
    padding: 16px 0 !important;
  }

  .single {
    margin: 0 8px;
    padding: 12px 14px;
    border-radius: 18px;
    background: var(--panel);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-sm);
  }

  .single__cover {
    height: 140px;
    margin-bottom: 20px;
  }

  .single__header {
    padding: 0;
    margin-bottom: 16px;
  }

  .single__header h1 {
    font-size: 1.4rem;
    margin: 8px 0 6px;
  }

  .single__header p {
    font-size: 0.92rem;
    margin: 0 0 10px;
    line-height: 1.5;
  }

  .single__meta {
    margin: 0 0 16px;
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    font-size: 0.68rem;
  }

  .single__meta span {
    flex: 1 1 0;
    text-align: center;
    padding: 6px 2px;
    font-size: 0.68rem;
    white-space: nowrap;
  }

  .single__body {
    padding: 0;
    font-size: 0.95rem;
  }

  .single__footer {
    padding: 16px 0 0;
    margin-top: 32px;
  }

  .comments {
    margin: 32px 0 0;
    padding: 24px 0 0;
  }

  /* 手机端导航栏：稍微紧凑 */
  .mobile-topbar {
    padding: 8px 14px !important;
    margin: 0 !important;
  }

  .mobile-menu__toggle,
  .mobile-search {
    width: 34px;
    height: 34px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  .mobile-topbar__brand .brand-title {
    font-size: 0.95rem;
  }

  .card__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .card__stats {
    display: none;
  }

  .feature-card {
    min-height: 188px;
    padding: 14px;
  }

  .featured-grid .feature-card {
    min-height: 188px;
  }

  .card {
    padding: 12px;
  }

  .card__title {
    margin: 8px 0 6px;
    font-size: 1.04rem;
  }

  .card__summary {
    line-height: 1.5;
  }

  .comments__form {
    grid-template-columns: 1fr;
  }

  .search-page__head {
    gap: 14px;
  }

  .search-page__form {
    min-width: 100%;
  }
}

@media (min-width: 1181px) {
  body {
    padding: 18px 24px 24px;
  }

  .shell {
    max-width: 1560px;
    margin: 0 auto;
    gap: 22px;
  }

  .content {
    padding-left: 0;
    padding-right: 0;
  }

  .featured-grid--desktop {
    display: grid;
  }

  .featured-carousel--mobile {
    display: none;
  }
}

/* ===== Tag Cloud ===== */
.tagcloud {
  margin-top: 18px;
  padding: 16px 14px;
  border: 1px solid rgba(16, 24, 40, 0.06);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.tagcloud__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.tagcloud__title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #475569;
}

.tagcloud__count {
  font-size: 0.7rem;
  font-weight: 600;
  color: #94a3b8;
  font-variant-numeric: tabular-nums;
}

.tagcloud__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tagcloud__link {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  padding: 4px 9px;
  border: 1px solid rgba(16, 24, 40, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  color: #334155;
  font-size: calc(0.78rem * var(--tag-weight, 1));
  font-weight: calc(500 * var(--tag-weight, 1));
  line-height: 1.2;
  transition: all 0.2s ease;
}

.tagcloud__link:hover {
  background: var(--accent-soft);
  border-color: rgba(14, 165, 233, 0.3);
  color: #0284c7;
  transform: translateY(-1px);
}

.tagcloud__num {
  font-size: 0.65em;
  font-weight: 600;
  color: #94a3b8;
  font-variant-numeric: tabular-nums;
}

.tagcloud__link:hover .tagcloud__num {
  color: #0284c7;
}