:root {
  color-scheme: light;
  /* WaPo-style palette: white paper, near-black ink, hairline gray rules,
     blue interactive accent, red reserved for focus/breaking. */
  --paper: oklch(100% 0 0);
  --paper-soft: oklch(97.2% 0.003 250);
  --ink: oklch(22% 0.012 260);
  --ink-muted: oklch(47% 0.014 260);
  --rule: oklch(88% 0.006 260);
  --rule-strong: oklch(34% 0.01 260);
  --accent: oklch(46% 0.13 250);
  --accent-soft: oklch(95% 0.03 250);
  --live: oklch(50% 0.2 27);
  --shadow: color-mix(in oklch, var(--ink) 10%, transparent);
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", serif;
  --display: "Didot", "Bodoni 72", "Hoefler Text", Georgia, "Times New Roman", serif;
  --sans: "Franklin Gothic Medium", "Franklin Gothic", "Helvetica Neue", Helvetica, Arial, "PingFang SC", sans-serif;
  --step--1: clamp(0.74rem, 0.71rem + 0.12vw, 0.82rem);
  --step-0: clamp(0.92rem, 0.89rem + 0.16vw, 1rem);
  --step-1: clamp(1.04rem, 0.98rem + 0.3vw, 1.22rem);
  --step-2: clamp(1.26rem, 1.13rem + 0.6vw, 1.62rem);
  --step-3: clamp(1.65rem, 1.38rem + 1.3vw, 2.5rem);
  --space: clamp(0.8rem, 0.5rem + 1.2vw, 1.6rem);
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: oklch(16% 0.006 260);
  --paper-soft: oklch(21% 0.008 260);
  --ink: oklch(93% 0.006 260);
  --ink-muted: oklch(70% 0.012 260);
  --rule: oklch(33% 0.01 260);
  --rule-strong: oklch(58% 0.012 260);
  --accent: oklch(74% 0.12 250);
  --accent-soft: oklch(28% 0.05 255);
  --live: oklch(68% 0.17 30);
  --shadow: color-mix(in oklch, black 38%, transparent);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.5;
  overflow-x: hidden;
}

h1,
h2,
h3,
p,
span,
dd,
a {
  overflow-wrap: anywhere;
}

button,
a {
  color: inherit;
}

a {
  text-decoration-color: color-mix(in oklch, var(--accent) 65%, transparent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--accent);
}

.page-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: 1rem;
  padding: clamp(0.7rem, 1.8vw, 1.4rem) 0 0.7rem;
  border-bottom: 2px solid var(--rule-strong);
}

.masthead__meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.masthead__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.7rem, 2vw, 1.25rem);
  text-align: center;
}

.kicker,
.section-label,
.footer-label {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--display);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.6rem);
  font-weight: 600;
}

.masthead__tools {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid var(--rule);
  background: color-mix(in oklch, var(--paper-soft) 78%, transparent);
  color: var(--ink);
  padding: 0.55rem 0.75rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  cursor: pointer;
}

.tool-btn:disabled {
  cursor: progress;
  opacity: 0.6;
}

.tool-btn__icon--refresh {
  width: 0.9rem;
  aspect-ratio: 1;
  border: 1.5px solid var(--ink);
  border-right-color: transparent;
  border-radius: 999px;
}

.tool-btn.is-loading .tool-btn__icon--refresh {
  animation: tool-btn-spin 0.7s linear infinite;
}

@keyframes tool-btn-spin {
  to {
    transform: rotate(360deg);
  }
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid var(--rule);
  background: color-mix(in oklch, var(--paper-soft) 78%, transparent);
  color: var(--ink);
  padding: 0.55rem 0.75rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  cursor: pointer;
}

.theme-toggle__icon {
  width: 0.82rem;
  aspect-ratio: 1;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ink) 50%, transparent 50%);
}

.section-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--rule);
}

.section-nav__tab {
  appearance: none;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--ink-muted);
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0.6rem 0.9rem;
  margin-bottom: -1px;
  cursor: pointer;
}

.section-nav__tab:hover {
  color: var(--accent);
}

.section-nav__tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.lead-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
  gap: clamp(1.25rem, 4vw, 3rem);
  padding: clamp(1.2rem, 3vw, 2.2rem) 0 clamp(1.1rem, 2.5vw, 1.8rem);
  border-bottom: 1px solid var(--rule);
}

.lead-copy {
  min-width: 0;
  max-width: 820px;
}

.lead-copy h2 {
  margin-top: 0.4rem;
  max-width: 20ch;
  font-size: var(--step-3);
  font-weight: 700;
}

#leadSummary {
  max-width: min(70ch, 100%);
  margin: 0.6rem 0 0;
  color: var(--ink-muted);
  font-size: var(--step-1);
}

/* 信息来源：刻意弱化，默认折叠，点击展开 */
.source-roster {
  margin-top: 1.4rem;
  border-top: 1px solid color-mix(in oklch, var(--rule) 70%, transparent);
  padding-top: 0.8rem;
}

.source-roster[hidden] {
  display: none;
}

.source-roster > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: var(--step--1, 0.82rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
  user-select: none;
}

.source-roster > summary::-webkit-details-marker {
  display: none;
}

.source-roster > summary::before {
  content: "▸";
  font-size: 0.7em;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.source-roster[open] > summary::before {
  transform: rotate(90deg);
}

.source-roster > summary:hover {
  color: var(--ink);
}

.source-roster__count {
  color: var(--accent);
  text-transform: none;
  letter-spacing: 0;
}

.source-roster__list {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
}

.source-roster__list li {
  font-size: var(--step--1, 0.8rem);
  color: var(--ink-muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.16rem 0.66rem;
  white-space: nowrap;
}

.issue-note {
  align-self: end;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: 1rem 0;
}

.issue-note dl {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.issue-note div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.issue-note dt {
  font-family: var(--sans);
  color: var(--ink-muted);
}

.issue-note dd {
  margin: 0;
  text-align: right;
  font-weight: 700;
}

.reader-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.75rem);
  padding: clamp(1.1rem, 2.5vw, 2rem) 0;
}

.rank-index {
  position: sticky;
  top: 1rem;
  align-self: start;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding-right: 1rem;
  border-right: 1px solid var(--rule);
}

.rank-index ol {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.rank-index a {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink-muted);
  font-family: var(--sans);
  font-size: 0.84rem;
  line-height: 1.3;
}

.rank-index a:hover {
  color: var(--accent);
}

.rank-index span:first-child {
  font-family: var(--serif);
  color: var(--ink);
  font-size: 1.2rem;
  line-height: 1;
}

.story-list {
  display: grid;
  gap: clamp(1.1rem, 2.5vw, 1.9rem);
  min-width: 0;
}

.story {
  display: grid;
  grid-template-columns: minmax(2.4rem, 3.6rem) minmax(0, 1fr);
  gap: clamp(0.85rem, 2vw, 1.6rem);
  padding-bottom: clamp(1.1rem, 2.5vw, 1.9rem);
  border-bottom: 1px solid var(--rule);
  min-width: 0;
}

.story > div {
  min-width: 0;
}

.story__rank {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.7rem);
  line-height: 0.9;
  color: var(--accent);
  font-variant-numeric: lining-nums;
}

.story__eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.7rem;
  align-items: center;
  margin-bottom: 0.8rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.pill {
  border: 1px solid color-mix(in oklch, var(--accent) 35%, var(--rule));
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.1rem 0.42rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.pill--focus {
  border-color: var(--live);
  background: var(--live);
  color: var(--paper);
  font-weight: 700;
}

.story h3 {
  max-width: 32ch;
  font-size: var(--step-2);
  font-weight: 700;
}

.story__reason {
  max-width: 74ch;
  margin: 0.5rem 0 0;
  color: var(--ink-muted);
}

.deep-summary {
  margin-top: 1rem;
  display: grid;
  gap: 0.85rem;
  max-width: 860px;
}

.deep-summary__lede {
  font-size: var(--step-1);
  color: var(--ink);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.5rem;
}

.summary-block {
  border-top: 1px solid var(--rule);
  padding-top: 0.8rem;
}

.summary-block h4,
.sources h4 {
  margin: 0 0 0.45rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.summary-block p,
.summary-block ul {
  margin: 0;
  color: var(--ink-muted);
}

.summary-block ul {
  padding-left: 1.2rem;
}

.sources {
  margin-top: 1.2rem;
  max-width: 820px;
}

.sources ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.sources li {
  display: grid;
  gap: 0.1rem;
  border-left: 2px solid var(--rule);
  padding-left: 0.75rem;
}

.sources a {
  font-weight: 700;
}

.source-meta {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: end;
  padding: 1.1rem 0 2rem;
  border-top: 2px solid var(--rule-strong);
  font-family: var(--sans);
  font-size: var(--step--1);
  color: var(--ink-muted);
}

.site-footer p {
  margin: 0.2rem 0 0;
}

@media (max-width: 820px) {
  .page-shell {
    width: min(100% - 20px, 720px);
  }

  .masthead {
    grid-template-columns: 1fr;
    align-items: center;
  }

  .masthead__meta {
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: flex-start;
  }

  .masthead__brand {
    justify-content: flex-start;
    text-align: left;
  }

  .masthead__tools {
    justify-content: flex-start;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(2.35rem, 12vw, 3.55rem);
  }

  .lead-section,
  .reader-layout,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .lead-copy h2 {
    max-width: 100%;
  }

  .lead-copy,
  .story > div {
    width: 100%;
    max-width: calc(100vw - 20px);
  }

  .story h3,
  .lead-copy p:last-child,
  .story__reason,
  .deep-summary__lede,
  .deep-summary,
  .sources,
  .summary-block p,
  .summary-block li {
    width: 100%;
    max-width: calc(100vw - 20px);
  }

  .story h3 {
    inline-size: calc(100vw - 40px);
    max-inline-size: calc(100vw - 40px);
    font-size: clamp(1.35rem, 6.2vw, 1.85rem);
    overflow-wrap: break-word;
    word-break: break-word;
  }

  .rank-index {
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 0 0 1rem;
  }

  .rank-index ol {
    display: flex;
    max-width: 100%;
    overflow-x: auto;
    gap: 1rem;
    padding-bottom: 0.4rem;
  }

  .rank-index li {
    flex: 0 0 72%;
  }

  .issue-note div {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .issue-note dd {
    text-align: left;
  }

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

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

@media (max-width: 480px) {
  .story__eyebrow {
    align-items: flex-start;
  }

  .rank-index li {
    flex-basis: 86%;
  }
}