/*
 * JiaVerse Editorial Observatory
 * Shared reading palette and blog-index composition.
 * Article-specific figures may extend these tokens, but must not replace their roles.
 */

:root {
  color-scheme: light dark;
  --paper: #f4f7f8;
  --surface: #ffffff;
  --surface-2: #edf2f4;
  --ink: #12202b;
  --muted: #61717d;
  --faint: #89969f;
  --line: #d9e1e5;
  --line-strong: #aebbc2;
  --evidence: #1f5b7a;
  --evidence-2: #5f879c;
  --evidence-open: #e7f0f4;
  --signal: #e45d32;
  --signal-2: #a94f31;
  --signal-text: #a8391c;
  --signal-open: #fff0e9;
  --gold: #765713;
  --gold-open: #f7f0de;
  --focus: #87432f;
  --good: #2d6d5a;
  --good-open: #e4f1ed;
  --shadow-float: 0 1.125rem 3.125rem rgba(18, 32, 43, 0.12);
  --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-serif: ui-serif, "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --content: 45rem;
  --wide: 70rem;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #10171c;
  --surface: #172127;
  --surface-2: #1d2a31;
  --ink: #edf4f6;
  --muted: #afbec6;
  --faint: #85959e;
  --line: #33444d;
  --line-strong: #60737c;
  --evidence: #75b8d5;
  --evidence-2: #9cc8db;
  --evidence-open: #17303c;
  --signal: #ff8a5d;
  --signal-2: #ffb18f;
  --signal-text: #ff9b73;
  --signal-open: #38231e;
  --gold: #dfb95c;
  --gold-open: #312b1d;
  --focus: #ffc1a8;
  --good: #74bba5;
  --good-open: #1b302a;
  --shadow-float: 0 1.125rem 3.125rem rgba(0, 0, 0, 0.32);
}

html[data-theme="light"] {
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  html.article-theme-auto:not([data-theme]) {
    --paper: #10171c;
    --surface: #172127;
    --surface-2: #1d2a31;
    --ink: #edf4f6;
    --muted: #afbec6;
    --faint: #85959e;
    --line: #33444d;
    --line-strong: #60737c;
    --evidence: #75b8d5;
    --evidence-2: #9cc8db;
    --evidence-open: #17303c;
    --signal: #ff8a5d;
    --signal-2: #ffb18f;
    --signal-text: #ff9b73;
    --signal-open: #38231e;
    --gold: #dfb95c;
    --gold-open: #312b1d;
    --focus: #ffc1a8;
    --good: #74bba5;
    --good-open: #1b302a;
    --shadow-float: 0 1.125rem 3.125rem rgba(0, 0, 0, 0.32);
  }
}

.article-theme-switch {
  display: none;
}

.js .article-theme-switch {
  min-block-size: 2.75rem;
  padding: 0.1875rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: grid;
  grid-template-columns: repeat(3, auto);
  align-items: center;
  background: var(--surface);
}

.article-theme-switch button {
  min-block-size: 2.25rem;
  padding-inline: 0.7rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: 700 0.72rem/1 var(--font-sans);
  cursor: pointer;
}

.article-theme-switch button:hover {
  color: var(--ink);
}

.article-theme-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.blog-body {
  background: var(--paper);
  color: var(--ink);
}

.blog-body .site-shell {
  background: var(--paper);
}

.blog-body .site-header {
  border-block-end: var(--rule-hair) solid var(--line);
}

.blog-body .brand span {
  color: var(--signal-text);
}

.blog-body .back-link {
  color: var(--muted);
}

.blog-body .blog-hero {
  position: relative;
  min-block-size: 32rem;
  padding-block-start: clamp(4rem, 8vw, 7rem);
  padding-block-end: clamp(4.5rem, 9vw, 7.5rem);
}

.blog-hero__edition {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.75rem;
  color: var(--evidence);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
}

.blog-hero__edition::before {
  width: 2.125rem;
  height: 0.125rem;
  background: var(--evidence);
  content: "";
}

.blog-body .blog-hero h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 7vw, 5.35rem);
  line-height: 0.98;
  letter-spacing: -0.038em;
}

.blog-body .blog-hero .lede {
  max-width: 38rem;
  margin-block-start: 1.75rem;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  line-height: 1.8;
}

.blog-hero__summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  margin-block-start: 2rem;
  padding-block-start: 1rem;
  border-block-start: var(--rule-hair) solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.blog-hero__summary strong {
  color: var(--signal-text);
  font-size: 1rem;
}

.blog-body .blog-hero-mark {
  color: var(--evidence);
}

.blog-body .blog-index {
  padding-block: clamp(4.5rem, 8vw, 7rem);
  background: var(--surface-2);
}

.blog-body .blog-index-header h2 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.blog-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  overflow: clip;
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-float);
}

.blog-feature + .blog-feature {
  margin-block-start: clamp(2.5rem, 6vw, 5rem);
}

.blog-feature__visual {
  display: block;
  min-block-size: 13rem;
  overflow: clip;
  background: var(--paper);
}

.blog-feature__visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 420ms var(--ease-out);
}

.blog-feature__copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: clamp(1.5rem, 4vw, 3.5rem);
}

.blog-feature__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-block-end: 1.5rem;
  color: var(--evidence);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.blog-feature h3 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(2rem, 4.7vw, 3.85rem);
  font-weight: 740;
  line-height: 1.04;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.blog-feature h3 a {
  text-decoration: none;
}

.blog-feature__subtitle {
  margin: 1.1rem 0 0;
  color: var(--evidence);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  font-weight: 700;
  line-height: 1.45;
}

.blog-feature__excerpt {
  max-width: 38rem;
  margin: 1.75rem 0 0;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
}

.blog-feature__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 1.75rem 0 0;
  padding: 1rem 0;
  border-block: var(--rule-hair) solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  list-style: none;
}

.blog-feature__facts li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-feature__facts li::before {
  width: 0.38rem;
  aspect-ratio: 1;
  border-radius: 999px;
  background: var(--signal);
  content: "";
}

.blog-feature__facts li:nth-child(2)::before {
  background: var(--evidence);
}

.blog-feature__facts li:nth-child(3)::before {
  background: var(--good);
}

.blog-feature__footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-block-start: auto;
  padding-block-start: 2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.blog-read-link {
  display: inline-flex;
  min-block-size: 2.75rem;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--surface);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--dur-short) var(--ease-out);
}

.blog-register {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-block-start: 2rem;
  border-block: var(--rule-hair) solid var(--line-strong);
}

.blog-register p {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
  margin: 0;
  padding-block: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.blog-register p + p {
  border-block-start: var(--rule-hair) solid var(--line);
}

.blog-register p:last-child {
  display: block;
  line-height: 1.65;
}

.blog-register strong {
  color: var(--ink);
  font-weight: 650;
}

.register-dot {
  width: 0.5rem;
  aspect-ratio: 1;
  border-radius: 999px;
}

.register-dot--blue {
  background: var(--evidence);
}

.register-dot--orange {
  background: var(--signal);
}

.blog-body .blog-method {
  background: var(--paper);
}

.blog-body .blog-method li span {
  color: var(--evidence);
}

.blog-body .site-footer {
  border-block-start-color: var(--line);
}

.blog-feature__visual:focus-visible,
.blog-feature h3 a:focus-visible,
.blog-read-link:focus-visible {
  outline: 0.125rem solid var(--focus);
  outline-offset: 0.25rem;
}

@media (min-width: 48rem) {
  .blog-body .blog-hero-copy {
    grid-column: 1 / span 9;
  }

  .blog-feature {
    grid-template-columns: minmax(0, 1.05fr) minmax(22rem, 0.95fr);
    min-block-size: 35rem;
  }

  .blog-feature__visual {
    display: flex;
    min-block-size: 35rem;
    align-items: center;
    justify-content: center;
    padding: clamp(1rem, 2.5vw, 2.25rem);
  }

  .blog-feature__visual img {
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  .blog-register {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(18rem, 2fr);
  }

  .blog-register p {
    padding: 1.1rem 1.5rem;
  }

  .blog-register p + p {
    border-block-start: 0;
    border-inline-start: var(--rule-hair) solid var(--line);
  }
}

@media (hover: hover) and (pointer: fine) {
  .blog-feature__visual:hover img {
    transform: scale(1.018);
  }

  .blog-read-link:hover {
    transform: translateY(-0.25rem);
  }

  .blog-feature h3 a:hover {
    color: var(--signal-text);
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-feature__visual img,
  .blog-read-link {
    transition-duration: 0.01ms;
  }
}

@media (max-width: 34rem) {
  .blog-body .blog-hero h1 {
    font-size: clamp(2.7rem, 13vw, 3.5rem);
  }

  .blog-feature__visual {
    min-block-size: 11rem;
  }

  .blog-feature__copy {
    padding: 1.35rem;
  }
}