/* ==========================================================================
   MindCadence — shared stylesheet for index.html and article.html
   Design tokens sourced from the MindCadence Claude Design project.
   ========================================================================== */

:root {
  /* Brand — deep blue primary */
  --blue-700: #14293D;
  --blue-600: #1C3D5A;
  --blue-100: #EAF0F6;
  --blue-050: #F1F5F8;

  /* Brand — sage green accent */
  --green-600: #5E8B7E;
  --green-100: #EBF3EE;
  --green-050: #EDF3EF;

  /* Muted blue-green — quiet kicker labels on personal-story articles */
  --teal-muted: #4F7A82;

  /* Neutrals — warm */
  --surface: #FBFAF6;
  --surface-plain: #FFFFFF;
  --surface-alt: #FBFCFB;
  --ink-900: #24303A;
  --ink-600: #48586A;
  --ink-500: #5A6B78;
  --ink-300: #93A0A8;
  --line: #EDEAE3;
  --line-cool: #CDD7DE;

  --color-primary: var(--blue-600);
  --color-primary-strong: var(--blue-700);
  --color-accent: var(--green-600);
  --on-primary: #FFFFFF;
  --bg-page: #EEF1F3;

  /* Typography */
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "Work Sans", -apple-system, "Helvetica Neue", Arial, sans-serif;

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;

  --fs-hero: 48px;   --lh-hero: 1.08;
  --fs-h2: 40px;     --lh-h2: 1.15;
  --fs-h3: 22px;     --lh-h3: 1.3;
  --fs-lead: 20px;   --lh-lead: 1.65;
  --fs-body: 16px;   --lh-body: 1.6;
  --fs-small: 15px;  --lh-small: 1.6;
  --fs-eyebrow: 13px;
  --ls-eyebrow: 0.16em;

  /* Spacing / radii / shadow */
  --space-1: 8px;
  --space-2: 14px;
  --space-3: 20px;
  --space-4: 28px;
  --space-5: 40px;
  --space-6: 56px;
  --space-7: 84px;
  --content-max: 1200px;

  --radius-button: 10px;
  --radius-card: 16px;
  --radius-image: 18px;
  --radius-pill: 999px;

  --shadow-cta: 0 14px 28px -10px rgba(28,61,90,.55);
  --shadow-card: 0 24px 60px -30px rgba(20,41,61,.35);
  --shadow-page: 0 30px 80px -40px rgba(20,41,61,.40);
}

/* ---- Reset ---- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg-page);
  font-family: var(--font-body);
  color: var(--ink-900);
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-strong); }
img { max-width: 100%; display: block; }
button, input, textarea { font-family: inherit; }

/* ---- Page shell ---- */
.shell {
  width: min(94vw, var(--content-max));
  margin: 40px auto 72px;
  background: var(--surface);
  border-radius: 20px;
  box-shadow: var(--shadow-page);
  overflow: hidden;
}
.shell--article {
  width: min(92vw, 1000px);
  margin: 40px auto;
}

/* ---- Header / nav ---- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px var(--space-6);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--color-primary);
  position: relative;
  flex-shrink: 0;
}
.logo-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2.5px solid var(--color-accent);
}
.logo-mark--sm { width: 28px; height: 28px; border-radius: 8px; }
.logo-mark--sm::after { width: 12px; height: 12px; border-width: 2px; }
.logo-text {
  font: var(--fw-semibold) 22px/1 var(--font-display);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}
.logo-text--sm { font-size: 20px; }

.nav {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}
.nav-link {
  font: var(--fw-medium) 15px/1 var(--font-body);
  color: var(--ink-900);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: var(--fw-semibold) 15px/1 var(--font-body);
  padding: 12px 22px;
  border-radius: var(--radius-button);
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--on-primary);
}
.btn-primary:hover { background: var(--color-primary-strong); color: var(--on-primary); }
.btn-cta {
  font-size: 19px;
  padding: 20px 40px;
  border-radius: 12px;
  box-shadow: var(--shadow-cta);
}
.btn-outline {
  background: var(--surface-plain);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-outline:hover { background: var(--blue-050); color: var(--color-primary); }
.link-underline {
  color: var(--color-primary);
  font: var(--fw-semibold) 16px/1 var(--font-body);
  padding: 14px 6px;
  border-bottom: 2px solid var(--line-cool);
}

/* ---- Typography helpers ---- */
.eyebrow {
  font: var(--fw-semibold) var(--fs-eyebrow)/1 var(--font-body);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
}
.tag {
  font: var(--fw-semibold) 12px/1 var(--font-body);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 640px;
  margin-bottom: var(--space-5);
}
.section-head h2 {
  margin: 0;
  font: var(--fw-medium) var(--fs-h2)/var(--lh-h2) var(--font-display);
  color: var(--color-primary);
}

/* ---- Sections ---- */
.section {
  padding: var(--space-7) var(--space-6);
}
.section-tint-blue { background: var(--blue-050); }
.section-tint-green { background: var(--green-100); }

/* ---- Hero ---- */
.hero {
  --color-primary: #16323D;
  --color-primary-strong: #0F242C;
  background: #F5F2E9;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding: 88px var(--space-6);
}
.hero-content { display: flex; flex-direction: column; gap: 26px; }
.hero-content h1 {
  margin: 0;
  font: var(--fw-medium) var(--fs-hero)/var(--lh-hero) var(--font-display);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}
.hero-content p {
  margin: 0;
  font: var(--fw-regular) var(--fs-lead)/var(--lh-lead) var(--font-body);
  color: var(--ink-600);
  max-width: 480px;
}
.hero-actions {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 8px;
}
.hero-image {
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-image);
  box-shadow: 0 20px 50px rgba(28,61,90,0.12);
  border: 1px solid rgba(28,61,90,0.08);
}
.hero-image-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
  box-shadow: var(--shadow-card);
  transform: scale(1.06);
  transform-origin: center;
}

/* ---- Image slot placeholders ---- */
.image-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px;
  text-align: center;
  background: linear-gradient(135deg, var(--blue-100), var(--green-100));
  border: 1px dashed var(--line-cool);
  color: var(--ink-500);
  font: var(--fw-medium) 13px/1.4 var(--font-body);
}
.slot-16x9 { aspect-ratio: 16 / 9; border-radius: var(--radius-image); }
.article-hero-img {
  width: 100%;
  display: block;
  object-fit: cover;
}
.related-card-img {
  width: 100%;
  display: block;
  object-fit: cover;
}
.slot-1x1 { aspect-ratio: 1 / 1; border-radius: var(--radius-image); }
.slot-16x10-lg { aspect-ratio: 16 / 10; border-radius: 14px; }
.slot-16x10-sm { aspect-ratio: 16 / 10; border-radius: 12px; }
.slot-4x3 { aspect-ratio: 4 / 3; border-radius: 12px; }

/* ---- Feature cards (Three ways) ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}
.feature-card {
  background: var(--surface-plain);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 38px 34px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-icon--blue { background: var(--blue-100); }
.feature-icon--green { background: var(--green-100); }
.icon-diamond {
  width: 20px; height: 20px; border-radius: 5px;
  background: var(--color-primary); transform: rotate(45deg);
}
.icon-ring {
  width: 22px; height: 22px; border-radius: 50%;
  border: 4px solid var(--color-accent);
}
.icon-drop {
  width: 24px; height: 24px;
  border-radius: 50% 50% 50% 2px;
  background: var(--color-primary); transform: rotate(45deg);
}
.feature-card h3 {
  margin: 0;
  font: var(--fw-semibold) var(--fs-h3)/var(--lh-h3) var(--font-display);
  color: var(--ink-900);
}
.feature-card p {
  margin: 0;
  font: var(--fw-regular) var(--fs-body)/var(--lh-body) var(--font-body);
  color: var(--ink-500);
}

/* ---- About ---- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 60px;
  align-items: center;
}
.about-image-img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: var(--shadow-card);
}
.article-image-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 14px;
}
.about-copy { display: flex; flex-direction: column; gap: 22px; }
.about-copy h2 {
  margin: 0;
  font: var(--fw-medium) var(--fs-h2)/var(--lh-h2) var(--font-display);
  color: var(--color-primary);
}
.about-copy p {
  margin: 0;
  font: var(--fw-regular) 18px/1.7 var(--font-body);
  color: var(--ink-600);
}
/* 定位宣言（2026-11-02）：首页"关于脑韵"标题下方 */
.about-copy p.about-mission {
  margin-top: -8px;
  font: italic var(--fw-regular) 20px/1.5 var(--font-display);
  color: var(--teal-muted);
}
html[lang^="zh"] .about-copy p.about-mission {
  font-style: normal;
  font-family: var(--font-body);
  font-size: 18px;
  letter-spacing: 0.04em;
}
.pull-quote {
  margin: 8px 0 0;
  padding: 22px 26px;
  border-left: 3px solid var(--color-accent);
  background: var(--surface-plain);
  border-radius: 0 12px 12px 0;
  font: italic var(--fw-regular) 20px/1.6 var(--font-display);
  color: #2b3a47;
}

/* ---- Article cards (Featured articles) ---- */
.articles-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 44px;
  gap: 24px;
  flex-wrap: wrap;
}
.articles-head h2 {
  margin: 0;
  font: var(--fw-medium) var(--fs-h2)/var(--lh-h2) var(--font-display);
  color: var(--color-primary);
}
.articles-head .browse-link {
  font: var(--fw-semibold) 15px/1 var(--font-body);
  color: var(--color-primary);
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}
.article-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.article-card h3 {
  margin: 0;
  font: var(--fw-semibold) 22px/1.3 var(--font-display);
  color: var(--ink-900);
}
.article-card p {
  margin: 0;
  font: var(--fw-regular) var(--fs-small)/var(--lh-small) var(--font-body);
  color: var(--ink-500);
}
.card-link {
  font: var(--fw-semibold) 14px/1 var(--font-body);
  color: var(--color-primary);
  margin-top: 2px;
}

/* Boxed variant used on the article page's "Related resources" */
.article-card--boxed {
  background: var(--surface-plain);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 22px 20px;
  gap: 14px;
}
.article-card--boxed h3 { font-size: 19px; }

/* ---- Newsletter / contact ---- */
.newsletter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 60px;
  align-items: start;
}
.newsletter-copy { display: flex; flex-direction: column; gap: 20px; }
.newsletter-copy h2 {
  margin: 0;
  font: var(--fw-medium) 38px/1.15 var(--font-display);
  color: var(--color-primary);
}
.newsletter-copy > p {
  margin: 0;
  font: var(--fw-regular) 18px/1.7 var(--font-body);
  color: var(--ink-600);
  max-width: 440px;
}
.newsletter-success {
  background: var(--surface-plain);
  border-radius: 12px;
  padding: 20px 24px;
  font: var(--fw-medium) 16px/1.5 var(--font-body);
  color: #2b5a3f;
  border: 1px solid #cfe2d6;
  display: none;
}
.newsletter-success.is-visible { display: block; }
.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 460px;
}
.newsletter-form.is-hidden { display: none; }
.newsletter-row { display: flex; gap: 12px; flex-wrap: wrap; }
.input {
  flex: 1;
  min-width: 200px;
  font: var(--fw-regular) 16px/1 var(--font-body);
  padding: 16px 18px;
  border: 1px solid var(--line-cool);
  border-radius: var(--radius-button);
  background: var(--surface-plain);
  color: var(--ink-900);
  outline: none;
}
.input:focus { border-color: var(--color-primary); }
.form-hint {
  font: var(--fw-regular) 13px/1.5 var(--font-body);
  color: #6f7d72;
}

.contact-card {
  background: var(--surface-plain);
  border-radius: var(--radius-card);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  border: 1px solid #dfe7e1;
}
.contact-card h3 {
  margin: 0;
  font: var(--fw-semibold) 24px/1.2 var(--font-display);
  color: var(--color-primary);
}
.contact-card > p {
  margin: 0;
  font: var(--fw-regular) var(--fs-small)/1.6 var(--font-body);
  color: var(--ink-500);
}
.contact-card .contact-email {
  font: var(--fw-semibold) 15px/1 var(--font-body);
  color: var(--color-primary);
}
.input-plain {
  font: var(--fw-regular) 15px/1 var(--font-body);
  padding: 14px 16px;
  border: 1px solid #e0e6e2;
  border-radius: var(--radius-button);
  background: var(--surface-alt);
  outline: none;
  color: var(--ink-900);
}
.input-plain:focus { border-color: var(--color-primary); }
textarea.input-plain {
  font: var(--fw-regular) 15px/1.5 var(--font-body);
  resize: vertical;
}

/* ---- Footer ---- */
.site-footer {
  padding: 44px var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
}
.footer-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-nav a {
  font: var(--fw-medium) 14px/1 var(--font-body);
  color: var(--ink-500);
}
.footer-copyright {
  font: var(--fw-regular) 13px/1 var(--font-body);
  color: var(--ink-300);
}

/* ---- Article page specifics ---- */
.article-intro {
  padding: 64px 0 24px;
}
.article-intro-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.back-link {
  font: var(--fw-semibold) 13px/1 var(--font-body);
  letter-spacing: 0.06em;
  color: var(--color-accent);
}
.story-kicker {
  display: block;
  font: var(--fw-medium) 11px/1.4 var(--font-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-muted);
}
.article-title {
  margin: 0;
  font: var(--fw-medium) 46px/1.12 var(--font-display);
  color: var(--color-primary);
  letter-spacing: -0.01em;
  text-wrap: pretty;
}
.article-subtitle {
  margin: 0;
  font: var(--fw-regular) var(--fs-lead)/1.6 var(--font-body);
  color: var(--ink-600);
}
.byline {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 4px;
}
.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--blue-100);
  flex-shrink: 0;
}
.byline-meta { display: flex; flex-direction: column; gap: 2px; }
.byline-name {
  font: var(--fw-semibold) var(--fs-small)/1.2 var(--font-body);
  color: var(--ink-900);
}
.byline-sub {
  font: var(--fw-regular) 13px/1.2 var(--font-body);
  color: var(--ink-300);
}
.article-hero-wrap {
  max-width: 820px;
  margin: 44px auto 0;
  padding: 0 var(--space-6);
}
.article-body {
  max-width: 680px;
  margin: 0 auto;
  padding: 44px var(--space-6) 8px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.article-body p {
  margin: 0;
  font: var(--fw-regular) 19px/1.75 var(--font-display);
  color: #2b3a47;
}
.story-divider {
  width: 64px;
  height: 1px;
  margin: 4px auto;
  border: none;
  background: var(--line-cool);
}
.article-body p.story-note {
  font: italic var(--fw-regular) 15px/1.6 var(--font-body);
  color: var(--ink-500);
}
.article-body h2 {
  margin: 8px 0 0;
  font: var(--fw-semibold) 28px/1.25 var(--font-display);
  color: var(--color-primary);
}
.pull-quote-lg {
  margin: 8px 0;
  padding: 26px 30px;
  border-left: 3px solid var(--color-accent);
  background: var(--blue-050);
  border-radius: 0 14px 14px 0;
  font: italic var(--fw-regular) 23px/1.55 var(--font-display);
  color: var(--color-primary);
}
.article-body h3 {
  margin: 4px 0 0;
  font: var(--fw-semibold) 22px/1.35 var(--font-display);
  color: var(--ink-900);
}
.article-body ul {
  margin: 0;
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.article-body ul li {
  font: var(--fw-regular) 19px/1.6 var(--font-display);
  color: #2b3a47;
}
.article-body sup {
  font-size: 0.6em;
  font-weight: var(--fw-semibold);
  margin-left: 1px;
}
.article-body sup a {
  color: var(--color-accent);
  text-decoration: none;
}
.article-body sup a:hover { text-decoration: underline; }
.references-block {
  margin: 8px 0 0;
  padding: 30px 32px;
  background: var(--blue-050);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.references-block h2 { margin: 0; }
.references-list {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font: var(--fw-regular) 14px/1.6 var(--font-body);
  color: var(--ink-500);
}
.references-list a { color: var(--color-primary); word-break: break-word; }
.medical-note {
  margin: 8px 0 0;
  padding: 22px 26px;
  border: 1px solid var(--line-cool);
  border-radius: 12px;
  background: var(--surface-alt);
  font: var(--fw-medium) 14px/1.6 var(--font-body);
  color: var(--ink-600);
}
.medical-note strong { color: var(--ink-900); }
.related-section {
  background: var(--blue-050);
  padding: 64px var(--space-6);
  margin-top: 40px;
}
.related-inner { max-width: 820px; margin: 0 auto; }
.related-inner .eyebrow { display: block; margin-bottom: 8px; }
.related-inner h2 {
  margin: 0 0 32px;
  font: var(--fw-medium) 32px/1.2 var(--font-display);
  color: var(--color-primary);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

/* ---- Nav active state ---- */
.nav-link.is-active {
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
}

/* ---- Resources page ---- */
.resources-intro {
  padding: 72px var(--space-6) 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 760px;
}
.resources-intro p {
  margin: 0;
  font: var(--fw-regular) var(--fs-lead)/1.6 var(--font-body);
  color: var(--ink-600);
  text-wrap: pretty;
}

/* ---- Compact text index (e.g. "Jump to a story") ---- */
.story-toc {
  margin-top: 4px;
}
.story-toc-label {
  display: block;
  font: var(--fw-semibold) var(--fs-eyebrow)/1 var(--font-body);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 4px;
}
.story-toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--line);
}
.story-toc-list li {
  border-top: 1px solid var(--line);
}
.story-toc-list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 2px;
  font: var(--fw-medium) 19px/1.3 var(--font-display);
  color: var(--ink-900);
}
.story-toc-list a:hover { color: var(--color-primary); }
.story-toc-number {
  font: var(--fw-medium) 13px/1 var(--font-body);
  color: var(--ink-300);
  flex-shrink: 0;
}

.topic-filter {
  padding: 8px var(--space-6) 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.topic-filter-label {
  font: var(--fw-semibold) var(--fs-eyebrow)/1 var(--font-body);
  color: var(--ink-300);
  margin-right: 4px;
}
.topic-pill {
  font: var(--fw-semibold) 14px/1 var(--font-body);
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  background: var(--surface-plain);
  color: var(--ink-600);
  border: 1px solid var(--line-cool);
}
.topic-pill.is-active {
  background: var(--color-primary);
  color: var(--on-primary);
  border-color: var(--color-primary);
}

.resource-grid {
  padding: 28px var(--space-6) 40px;
}
.resource-grid-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.resource-card {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 22px;
  background: var(--surface-plain);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 22px;
}
.resource-card-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}
.resource-card-body h3 {
  margin: 0;
  font: var(--fw-semibold) 22px/1.28 var(--font-display);
  color: var(--ink-900);
  text-wrap: pretty;
}
.resource-card-body p {
  margin: 0;
  font: var(--fw-regular) var(--fs-small)/1.55 var(--font-body);
  color: var(--ink-500);
}
.resource-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 8px;
}
.resource-meta-text {
  font: var(--fw-regular) 13px/1 var(--font-body);
  color: var(--ink-300);
}
.resource-meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-cool);
}
.resource-read-link {
  margin-left: auto;
  font: var(--fw-semibold) 14px/1 var(--font-body);
  color: var(--color-primary);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .hero,
  .about-grid,
  .feature-grid,
  .article-grid,
  .newsletter-grid,
  .related-grid,
  .resource-grid-inner {
    grid-template-columns: 1fr;
  }
  .site-header { padding: 20px var(--space-3); }
  .section { padding: 56px var(--space-3); }
  .hero { padding: 56px var(--space-3); }
  .article-intro-inner,
  .article-hero-wrap,
  .article-body,
  .related-section { padding-left: var(--space-3); padding-right: var(--space-3); }
  .resources-intro,
  .topic-filter,
  .resource-grid { padding-left: var(--space-3); padding-right: var(--space-3); }
}

@media (max-width: 560px) {
  .hero-content h1 { font-size: 34px; }
  .article-title { font-size: 32px; }
  .section-head h2,
  .articles-head h2,
  .about-copy h2 { font-size: 28px; }
  .btn-cta { padding: 16px 28px; font-size: 17px; }
  .nav { gap: 16px; }
  .resource-card { grid-template-columns: 1fr; }
}

/* ---- Listen to article toggle ---- */
.listen-toggle {
  margin-top: 20px;
  padding: 10px 20px;
  border: 1.5px solid #1C3D5A;
  border-radius: var(--radius-pill, 999px);
  background: #fff;
  color: #1C3D5A;
  font: var(--fw-medium) 14px/1 var(--font-body);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.listen-toggle.is-speaking {
  background: #5E8B7E;
  border-color: #5E8B7E;
  color: #fff;
}

/* ---- Floating music toggle ---- */
.music-toggle {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 100;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius-pill, 999px);
  background: #1C3D5A;
  color: #fff;
  font: var(--fw-medium) 14px/1 var(--font-body);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: background 0.2s ease;
}
.music-toggle.is-playing {
  background: #5E8B7E;
}

/* ---- Language switch (EN / 中文) ---- */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: var(--fw-medium) 14px/1 var(--font-body);
  color: var(--ink-500);
}
.lang-switch a {
  color: var(--ink-500);
  padding: 4px 2px;
  border-bottom: 1px solid transparent;
}
.lang-switch a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.lang-switch .lang-current { color: var(--color-primary); font-weight: var(--fw-semibold); }
.lang-switch .lang-sep { color: var(--line-cool); }

/* Small note on Chinese listing pages: articles are still English */
.lang-note,
.resources-intro .lang-note {
  margin-top: 10px;
  font: var(--fw-regular) 14px/1.6 var(--font-body);
  color: var(--ink-500);
}

/* ---- Chinese pages: CJK font fallbacks + looser rhythm ---- */
html[lang^="zh"] {
  --font-display: "Newsreader", "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
  --font-body: "Work Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
html[lang^="zh"] .hero-content h1,
html[lang^="zh"] .article-title,
html[lang^="zh"] h2 { line-height: 1.3; }
html[lang^="zh"] p { line-height: 1.8; }
html[lang^="zh"] .eyebrow,
html[lang^="zh"] .tag,
html[lang^="zh"] .story-toc-label,
html[lang^="zh"] .story-kicker { letter-spacing: 0.08em; }

/* Chinese logo: "脑韵" followed by the English wordmark */
.logo-text-en { margin-left: 0.3em; }

/* ---- Newsletter page ---- */
.newsletter-copy .link-underline { align-self: flex-start; }
.nl-subscribe .newsletter-copy { max-width: 640px; }
.issue-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3);
}
.issue-card,
.issue-empty {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--space-4);
  background: var(--surface-plain);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  text-decoration: none;
  color: inherit;
}
.issue-card:hover { border-color: var(--line-cool); }
.issue-no, .issue-date {
  font: var(--fw-semibold) var(--fs-eyebrow)/1.2 var(--font-body);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.issue-date { color: var(--ink-500); }
.issue-card h3, .issue-empty h3 {
  margin: 0;
  font: var(--fw-semibold) var(--fs-h3)/var(--lh-h3) var(--font-display);
  color: var(--ink-900);
}
.issue-card p, .issue-empty p {
  margin: 0;
  font: var(--fw-regular) var(--fs-small)/var(--lh-small) var(--font-body);
  color: var(--ink-600);
}
.issue-empty { grid-column: 1 / -1; max-width: 640px; border-style: dashed; }

/* ---- Newsletter issue pages (newsletter/issue-NN.html) ---- */
.issue-meta {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  font: var(--fw-semibold) var(--fs-eyebrow)/1.2 var(--font-body);
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-500);
}
.issue-meta .issue-no { color: var(--color-accent); }
.art-figure { margin: 0; }
.art-figure img {
  width: 100%; display: block; border-radius: var(--radius-image);
  aspect-ratio: 16 / 9; object-fit: cover; background: var(--green-050);
}
.art-figure figcaption {
  margin-top: 10px;
  font: var(--fw-regular) 14px/1.5 var(--font-body); color: var(--ink-500);
}
.art-figure figcaption em { color: var(--ink-600); }
.nl-section-label {
  display: block; margin: 56px 0 4px;
  font: var(--fw-semibold) var(--fs-eyebrow)/1 var(--font-body);
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent);
}
.study {
  margin: 24px 0 8px; padding: 28px; border-radius: var(--radius-card);
  background: var(--surface-plain); border: 1px solid var(--line);
}
.study h3 { margin-top: 12px !important; }
.study p:last-child { margin-bottom: 0; }
.evidence-tag {
  display: inline-block; padding: 6px 12px; border-radius: var(--radius-pill);
  font: var(--fw-semibold) 13px/1 var(--font-body); letter-spacing: 0.02em;
  background: var(--blue-100); color: var(--blue-600);
}
.evidence-tag--animal { background: #F4EEE2; color: #7A5A2B; }
.evidence-tag--observational { background: var(--blue-100); color: var(--blue-600); }
.evidence-tag--trial { background: var(--green-100); color: #2F5D50; }
.evidence-tag--review { background: #EEEAF3; color: #55456E; }
.study-source {
  margin-top: 14px !important;
  font: var(--fw-regular) 14px/1.55 var(--font-body) !important; color: var(--ink-500) !important;
}
.study-source a { color: var(--color-primary); word-break: break-word; }
.study-takeaway {
  border-left: 3px solid var(--color-accent); padding-left: 16px;
}
.nl-links { list-style: none; padding: 0 !important; margin: 16px 0 0; display: grid; gap: 12px; }
.nl-links li::before { content: none !important; }
.nl-links a {
  display: block; padding: 18px 22px; border-radius: 12px; text-decoration: none;
  background: var(--blue-050); color: var(--ink-900);
  font: var(--fw-medium) 17px/1.45 var(--font-body);
}
.nl-links a span { display: block; margin-top: 4px; font-weight: 400; font-size: 15px; color: var(--ink-600); }
.nl-cta {
  margin-top: 56px; padding: 32px; border-radius: var(--radius-card);
  background: var(--green-100); display: flex; flex-direction: column; gap: 14px; align-items: flex-start;
}
.nl-cta p { margin: 0 !important; }
.feature-grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 900px) { .feature-grid--two { grid-template-columns: 1fr; } }
.nl-links + .medical-note { margin-top: 48px; }
.nl-pdf-link {
  align-self: flex-start; margin-top: 4px;
  font: var(--fw-medium) 15px/1.4 var(--font-body); color: var(--color-primary);
  text-decoration: none; border-bottom: 1.5px solid var(--line-cool); padding-bottom: 2px;
}
.nl-pdf-link::before { content: "↓ "; }
.issue-card .issue-pdf { margin-top: 4px; font: var(--fw-medium) 14px/1.4 var(--font-body); color: var(--color-primary); }
.issue-inaugural { color: var(--color-primary); border: 1px solid var(--color-primary); border-radius: var(--radius-pill); padding: 3px 9px; }
.nl-music-credit { margin: 2px 0 0; font: var(--fw-regular) 13px/1.5 var(--font-body); color: var(--ink-500); }
/* contact form: fields fill the card */
.contact-card form { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.contact-card form .input-plain { width: 100%; box-sizing: border-box; }
.contact-card form .btn { align-self: flex-start; }
/* newsletter issue: listen + PDF row */
.nl-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; margin-top: 4px; }
.nl-actions .listen-toggle, .nl-actions .nl-pdf-link { margin-top: 0; }
/* homepage: latest newsletter issue preview */
.latest-issue { display: flex; flex-direction: column; gap: 8px; max-width: 520px; padding: 22px 24px;
  background: var(--surface-plain); border-radius: var(--radius-card); border: 1px solid #d6e5dc; }
.latest-label { font: var(--fw-semibold) var(--fs-eyebrow)/1.3 var(--font-body); letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-accent); }
.latest-title { font: var(--fw-medium) 24px/1.25 var(--font-display); color: var(--color-primary); text-decoration: none; }
.latest-title:hover { text-decoration: underline; }
.latest-issue p { margin: 0; font: var(--fw-regular) 16px/1.55 var(--font-body); color: var(--ink-600); }
.latest-links { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 4px; }
.latest-links a { font: var(--fw-medium) 15px/1.4 var(--font-body); color: var(--color-primary); text-decoration: none; }
/* homepage: latest newsletter issue preview */
.latest-issue { display: flex; flex-direction: column; gap: 8px; max-width: 520px; padding: 22px 24px;
  background: var(--surface-plain); border-radius: var(--radius-card); border: 1px solid #d6e5dc; }
.latest-label { font: var(--fw-semibold) var(--fs-eyebrow)/1.3 var(--font-body); letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-accent); }
.latest-title { font: var(--fw-medium) 24px/1.25 var(--font-display); color: var(--color-primary); text-decoration: none; }
.latest-title:hover { text-decoration: underline; }
.latest-issue p { margin: 0; font: var(--fw-regular) 16px/1.55 var(--font-body); color: var(--ink-600); }
.latest-links { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 4px; }
.latest-links a { font: var(--fw-medium) 15px/1.4 var(--font-body); color: var(--color-primary); text-decoration: none; }
/* newsletter tagline */
.resources-intro .nl-tagline-sub { font: italic var(--fw-regular) 22px/1.45 var(--font-display); color: var(--color-accent); margin-top: -4px; }
html[lang^="zh"] .resources-intro .nl-tagline-sub { font-style: normal; font-size: 20px; letter-spacing: 0.04em; }
.nl-tagline { font: italic var(--fw-regular) 17px/1.4 var(--font-display); color: var(--color-accent); margin-bottom: -2px; }
html[lang^="zh"] .nl-tagline { font-style: normal; font-size: 16px; letter-spacing: 0.06em; }

/* homepage: What's New / 最近更新 (3 latest items; kit/publish_issue.py keeps it current) */
.hero { padding-top: 56px; padding-bottom: 72px; }
.whats-new { padding: 36px var(--space-6) 40px; background: var(--surface-plain); border-bottom: 1px solid var(--line); }
.wn-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 14px; }
.wn-head .eyebrow { margin: 0; }
.wn-all { font: var(--fw-medium) 15px/1.4 var(--font-body); color: var(--color-primary); text-decoration: none; }
.wn-all:hover { text-decoration: underline; }
.wn-list { list-style: none; margin: 0; padding: 0; }
.wn-list li + li { border-top: 1px solid var(--line); }
.wn-list a { display: grid; grid-template-columns: 130px minmax(0, 1fr) auto; gap: 20px; align-items: baseline;
  padding: 14px 0; text-decoration: none; color: inherit; }
.wn-tag { font: var(--fw-semibold) 12px/1.3 var(--font-body); letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent); }
.wn-title { font: var(--fw-medium) 20px/1.35 var(--font-display); color: var(--color-primary); }
.wn-list a:hover .wn-title { text-decoration: underline; }
.wn-date { font: var(--fw-regular) 14px/1.4 var(--font-body); color: var(--ink-500); white-space: nowrap; }
html[lang^="zh"] .wn-tag { letter-spacing: 0.04em; font-size: 13px; }
html[lang^="zh"] .wn-title { font-size: 19px; }
@media (max-width: 900px) {
  .hero { padding-top: 40px; padding-bottom: 48px; }
  .whats-new { padding: 28px var(--space-3) 32px; }
}
@media (max-width: 560px) {
  .wn-list a { grid-template-columns: auto 1fr; gap: 4px 12px; padding: 12px 0; }
  .wn-title { grid-column: 1 / -1; grid-row: 2; font-size: 18px; }
  .wn-date { justify-self: end; }
}