/* ── Design tokens ── */
:root {
  --color-canvas: #faf9f5;
  --color-surface-soft: #f5f0e8;
  --color-surface-card: #efe9de;
  --color-surface-cream-strong: #e8e0d2;
  --color-hairline: #e6dfd8;
  --color-hairline-soft: #ebe6df;

  --color-ink: #141413;
  --color-body-strong: #252523;
  --color-body: #3d3d3a;
  --color-muted: #6c6a64;
  --color-muted-soft: #8e8b82;

  --color-primary: #cc785c;
  --color-primary-active: #a9583e;
  --color-primary-disabled: #e6dfd8;
  --color-on-primary: #ffffff;

  --color-surface-dark: #181715;
  --color-surface-dark-elevated: #252320;
  --color-surface-dark-soft: #1f1e1b;
  --color-on-dark: #faf9f5;
  --color-on-dark-soft: #a09d96;

  --color-accent-teal: #5db8a6;
  --color-accent-amber: #e8a55a;
  --color-success: #5db872;
  --color-error: #c64545;

  --font-display: "EB Garamond", "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", Menlo, Monaco, Consolas, monospace;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  --spacing-xxs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-section: 96px;

  --max-width: 1200px;
  --header-height: 64px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --color-canvas: #181715;
  --color-surface-soft: #1f1e1b;
  --color-surface-card: #252320;
  --color-surface-cream-strong: #2a2723;
  --color-hairline: #3a3733;
  --color-hairline-soft: #2f2c29;

  --color-ink: #faf9f5;
  --color-body-strong: #e8e0d2;
  --color-body: #c4c0b8;
  --color-muted: #a09d96;
  --color-muted-soft: #6c6a64;

  --color-primary: #cc785c;
  --color-primary-active: #e08e73;
  --color-primary-disabled: #3a3733;
  --color-on-primary: #ffffff;

  /* Keep "dark surface" semantics: a panel darker than canvas, used by footer/code blocks.
     These must NOT invert to white, otherwise footer/code become white-on-white. */
  --color-surface-dark: #100f0d;
  --color-surface-dark-elevated: #181715;
  --color-surface-dark-soft: #141311;
  --color-on-dark: #faf9f5;
  --color-on-dark-soft: #a09d96;

  /* Architecture diagram accent fill: more saturated on dark canvas for visibility */
  --color-accent-fill: rgba(204, 120, 92, 0.22);
}

/* ── Base ── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-body);
  background-color: var(--color-canvas);
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 10000;
  padding: 8px 16px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--radius-md);
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ── Typography ── */
.heading-display-xl,
.heading-display-lg,
.heading-display-md,
.heading-display-sm,
.heading-display-xs {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-ink);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.heading-display-xl { font-size: 64px; line-height: 1.05; letter-spacing: -0.025em; }
.heading-display-lg { font-size: 48px; line-height: 1.1; letter-spacing: -0.02em; }
.heading-display-md { font-size: 36px; line-height: 1.15; letter-spacing: -0.015em; }
.heading-display-sm { font-size: 28px; line-height: 1.2; letter-spacing: -0.01em; }
.heading-display-xs { font-size: 24px; line-height: 1.25; }

.title-lg { font-size: 22px; font-weight: 500; line-height: 1.3; }
.title-md { font-size: 18px; font-weight: 500; line-height: 1.4; }
.title-sm { font-size: 16px; font-weight: 500; line-height: 1.4; }

.body-md { font-size: 16px; line-height: 1.55; }
.body-sm { font-size: 14px; line-height: 1.55; }

.caption {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
}

.caption-uppercase {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.text-muted { color: var(--color-muted); }
.text-muted-soft { color: var(--color-muted-soft); }

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline);
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.site-header.is-hidden {
  transform: translateY(-100%);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
}

.brand-mark {
  display: inline-flex;
  color: var(--color-ink);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.brand-on-dark .brand-mark,
.brand-on-dark .brand-name {
  color: var(--color-on-dark);
}

.main-nav {
  display: flex;
}

.nav-list {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-ink);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.theme-toggle,
.menu-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: var(--color-surface-soft);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.menu-toggle {
  display: none;
}

.hamburger-line {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  height: 40px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform 0.1s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:hover {
  background: var(--color-primary-active);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--color-canvas);
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}

.btn-secondary:hover {
  background: var(--color-surface-soft);
}

.btn-text {
  padding: 0;
  height: auto;
  color: var(--color-primary);
  text-decoration: none;
}

.btn-text:hover {
  text-decoration: underline;
}

.btn-card-link {
  background: var(--color-surface-soft);
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
  padding: 10px 20px;
}

.btn-card-link:hover {
  background: var(--color-surface-cream-strong);
  border-color: var(--color-hairline-strong);
}

.btn-card-link-accent {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  border-color: var(--color-surface-dark);
}

.btn-card-link-accent:hover {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-canvas);
}

/* ── Page root & transitions ── */
.page-root {
  min-height: calc(100vh - var(--header-height) - 300px);
}

.page-transition {
  animation: fadeInUp 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  animation: revealFade 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards paused;
  animation-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}

.reveal.is-visible {
  animation-play-state: running;
}

@keyframes revealFade {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Mouse tilt (desktop only) ── */
@media (hover: hover) and (pointer: fine) {
  .tilt-card,
  .hero-illustration-card {
    transform-style: preserve-3d;
    transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease;
  }

  .tilt-card:hover,
  .hero-illustration-card:hover {
    box-shadow: 0 16px 40px -12px rgba(20, 20, 19, 0.12);
  }

  [data-theme="dark"] .card:hover,
  [data-theme="dark"] .hero-illustration-card:hover {
    box-shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.35);
  }

  .card:hover {
    background: var(--color-surface-cream-strong);
    box-shadow: 0 12px 32px -12px rgba(20, 20, 19, 0.1);
  }
}

.page-section {
  padding: var(--spacing-section) 0;
}

.page-section.section-hero {
  min-height: calc(85vh - var(--header-height));
  min-height: calc(85dvh - var(--header-height));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0;
  position: relative;
  border-bottom: 1px solid var(--color-hairline);
}

.page-section.section-hero > .container {
  width: 100%;
}

.page-section.section-divider {
  border-top: 1px solid var(--color-hairline);
}

.page-section.section-white {
  background: var(--color-surface-soft);
}

.section-header {
  max-width: 720px;
  margin-bottom: var(--spacing-xxl);
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.section-title {
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ── Hero ── */
.hero-band {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr;
  gap: 80px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.hero-eyebrow {
  font-size: 14px;
  color: var(--color-muted);
}

.hero-title {
  font-size: 56px;
  line-height: 1.2;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.hero-subtitle {
  display: block;
  font-size: 28px;
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-muted);
  line-height: 1.4;
  margin-top: var(--spacing-md);
  letter-spacing: 0;
}

.hero-lead {
  max-width: 560px;
  font-size: 18px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-top: var(--spacing-sm);
}

.hero-welcome {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--color-muted);
  margin-bottom: var(--spacing-lg);
}

.hero-welcome-icon {
  display: inline-flex;
  color: var(--color-ink);
}

.hero-welcome-icon svg {
  width: 44px;
  height: 44px;
  animation: wave 2.5s linear infinite;
  transform-origin: 80% 80%;
}

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-12deg); }
  50% { transform: rotate(0deg); }
  75% { transform: rotate(12deg); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-welcome-icon svg {
    animation: none;
  }
}

.hero-typed {
  color: var(--color-ink);
  font-weight: 500;
}

.hero-typed::after {
  content: "|";
  color: var(--color-primary);
  animation: blink 1s step-start infinite;
}

.highlight-word {
  color: var(--color-primary);
  font-style: italic;
  white-space: nowrap;
}

.hero-roles {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 14px;
  color: var(--color-muted);
}

.hero-roles-label {
  font-weight: 500;
  color: var(--color-muted-soft);
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-description {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 480px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.hero-actions .btn {
  white-space: nowrap;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  white-space: nowrap;
}

.hero-visual {
  position: relative;
}

.hero-illustration-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.hero-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hero-card-badges {
  display: flex;
  gap: var(--spacing-xs);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
}

.badge-pill {
  background: var(--color-canvas);
  color: var(--color-ink);
}

.badge-coral {
  background: var(--color-primary);
  color: var(--color-on-primary);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 1px;
}

.badge-soft {
  color: #d97757;
  background: rgba(217, 119, 87, 0.1);
  border: 1px solid rgba(217, 119, 87, 0.2);
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.2px;
  padding: 3px 10px;
}

.hero-card-body {
  display: flex;
  gap: var(--spacing-md);
}

.hero-card-half {
  flex: 1;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background: var(--color-canvas);
  text-align: center;
}

.hero-card-half h3 {
  font-family: var(--font-display);
  font-size: 24px;
  margin-bottom: var(--spacing-xs);
  color: var(--color-ink);
}

.hero-card-half p {
  font-size: 14px;
  color: var(--color-muted);
}

.hero-card-footer {
  text-align: center;
  font-size: 16px;
  color: var(--color-body);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-hairline-soft);
}

/* ── Framework diagram ── */
.hero-illustration-card.framework-diagram {
  justify-content: center;
  align-items: center;
  min-height: auto;
  padding: var(--spacing-md);
}

.hero-illustration-card.framework-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), background var(--transition), box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transform-style: preserve-3d;
}

.card:hover {
  background: var(--color-surface-cream-strong);
}

.card-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-ink);
}

.card-description {
  font-size: 15px;
  color: var(--color-body);
  line-height: 1.55;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  font-size: 13px;
  color: var(--color-muted);
}

.card-link-icon {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.card-link-icon:hover {
  color: var(--color-primary-active);
}

.card-link-icon svg {
  flex-shrink: 0;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: auto;
  padding-top: var(--spacing-sm);
}

.tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-muted);
  background: var(--color-canvas);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-hairline);
}

/* ── Article list ── */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-card {
  display: block;
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-hairline);
  transition: border-color var(--transition);
  transform-style: preserve-3d;
}

.article-card:first-child {
  padding-top: 0;
}

.article-card:hover {
  border-color: var(--color-primary);
}

.article-date {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted-soft);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-sm);
}

.article-date-year::after {
  content: "·";
  margin-left: var(--spacing-xs);
}

.article-title {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.2;
  color: var(--color-ink);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition);
}

.article-card:hover .article-title {
  color: var(--color-primary);
}

.article-excerpt {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 640px;
  margin-bottom: var(--spacing-md);
}

.article-footer {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  font-size: 13px;
  color: var(--color-muted-soft);
}

.article-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.article-title {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--color-ink);
}

.article-excerpt {
  font-size: 15px;
  color: var(--color-body);
  line-height: 1.55;
}

.article-footer {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-top: var(--spacing-xs);
  font-size: 13px;
  color: var(--color-muted);
}

/* ── Article detail ── */
.article-detail {
  max-width: 760px;
  margin: 0 auto;
}

.article-detail-header {
  margin-bottom: var(--spacing-xxl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-hairline);
}

.article-detail-meta {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-size: 14px;
  color: var(--color-muted);
}

.article-detail-title {
  font-size: 48px;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

.article-detail-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.article-detail-body {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-body);
}

.article-detail-body {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-body);
}

/* ── Architecture diagram ── */
.architecture-diagram {
  max-width: 900px;
  margin: 0 auto var(--spacing-xxl);
  padding: var(--spacing-xl);
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
}

.architecture-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.architecture-diagram-title {
  text-align: center;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  color: var(--color-ink);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.01em;
}

/* ── Markdown styles ── */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-ink);
  margin-top: var(--spacing-xxl);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.markdown-body h1 { font-size: 36px; }
.markdown-body h2 { font-size: 28px; }
.markdown-body h3 { font-size: 24px; }
.markdown-body h4 { font-size: 20px; }

.markdown-body p {
  margin-bottom: var(--spacing-md);
}

.markdown-body svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: var(--spacing-lg) auto;
}

.markdown-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown-body ul,
.markdown-body ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.markdown-body ul {
  list-style: disc;
}

.markdown-body ol {
  list-style: decimal;
}

.markdown-body li {
  margin-bottom: var(--spacing-xs);
}

.markdown-body blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-body-strong);
  font-style: italic;
}

.markdown-body pre {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface-soft);
  color: var(--color-ink);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.markdown-body img {
  border-radius: var(--radius-lg);
  margin: var(--spacing-lg) 0;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--color-hairline);
  margin: var(--spacing-xxl) 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  font-size: 14px;
}

.markdown-body th,
.markdown-body td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-hairline);
  text-align: left;
}

.markdown-body th {
  background: var(--color-surface-soft);
  color: var(--color-ink);
  font-weight: 500;
}

/* ── About page ── */
.about-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--spacing-xxl);
  align-items: start;
}

.about-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
}

.about-avatar {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-xl);
  background: #cc785c;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  color: #fff;
  font-family: Georgia, serif;
  font-size: 80px;
  font-weight: bold;
}

.about-name {
  font-family: var(--font-display);
  font-size: 32px;
  color: var(--color-ink);
  margin-bottom: var(--spacing-xs);
}

.about-role {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: var(--spacing-lg);
}

.about-social {
  display: flex;
  gap: var(--spacing-sm);
}

.about-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-hairline);
  color: var(--color-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.about-social a:hover {
  color: var(--color-ink);
  background: var(--color-surface-soft);
  border-color: var(--color-primary);
}

.about-main h2 {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--color-ink);
  margin-bottom: var(--spacing-md);
}

.about-main p {
  margin-bottom: var(--spacing-md);
  font-size: 16px;
  line-height: 1.7;
}

.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

/* ── Coral CTA ── */
.cta-band {
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl);
  color: var(--color-on-primary);
  text-align: center;
  margin-top: var(--spacing-section);
}

.cta-band .heading-display-sm {
  color: var(--color-on-primary);
  margin-bottom: var(--spacing-md);
}

.cta-band p {
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.cta-band .btn-secondary {
  background: var(--color-canvas);
  color: var(--color-ink);
  border-color: transparent;
}

.cta-band .btn-secondary:hover {
  background: var(--color-surface-soft);
}

.cta-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.cta-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s, transform 0.2s;
  background: transparent;
}

.cta-social-link svg {
  width: 18px;
  height: 18px;
}

.cta-social-link:hover {
  color: rgba(255, 255, 255, 1);
  transform: scale(1.15);
  background: transparent;
}

/* ── Footer ── */
.site-footer {
  background: var(--color-surface-dark);
  color: var(--color-on-dark-soft);
  padding: 48px 0;
  margin-top: var(--spacing-section);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.footer-left .brand-on-dark {
  flex-shrink: 0;
}

.footer-bio {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-on-dark-soft);
  border-left: 1px solid var(--color-hairline-soft);
  padding-left: var(--spacing-xl);
  white-space: nowrap;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-nav-link {
  color: var(--color-on-dark-soft);
  font-size: 14px;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
  position: relative;
}

.footer-nav-link:hover {
  color: var(--color-on-dark);
  background: rgba(255, 255, 255, 0.06);
}

.footer-nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 12px;
  right: 12px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transition: transform 0.2s;
}

.footer-nav-link:hover::after {
  transform: scaleX(1);
}

/* ── WeChat QR Modal ── */
.wechat-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
}

.wechat-modal.is-open {
  display: flex;
}

.wechat-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.wechat-modal-content {
  position: relative;
  background: var(--color-surface, #fff);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 320px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: wechatModalIn 0.25s ease-out;
}

@keyframes wechatModalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.wechat-modal-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

.wechat-modal-close:hover {
  color: var(--color-ink);
}

.wechat-modal-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.wechat-modal-img {
  width: 100%;
  max-width: 240px;
  border-radius: 8px;
  margin-bottom: 12px;
}

.wechat-modal-hint {
  font-size: 13px;
  color: var(--color-muted);
}

/* ── Utilities ── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--color-muted);
}

.error-state {
  text-align: center;
  padding: var(--spacing-xxl);
  color: var(--color-muted);
}

.error-state h2 {
  font-family: var(--font-display);
  color: var(--color-error);
  margin-bottom: var(--spacing-md);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-band {
    grid-template-columns: 1fr;
  }

  .hero-illustration-card {
    min-height: 280px;
  }

  .hero-illustration-card.framework-diagram {
    min-height: 460px;
  }

  .framework-title {
    font-size: 22px;
  }

  .framework-label {
    font-size: 15px;
  }

  .framework-items {
    font-size: 12px;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-layout {
    grid-template-columns: 1fr;
  }

  .about-sidebar {
    position: static;
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
  }

  .about-avatar {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
  }

  .footer-left {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .footer-bio {
    border-left: none;
    padding-left: 0;
    white-space: normal;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
}

/* ── Mobile: editorial vertical flow (方案A) ── */
@media (max-width: 768px) {
  :root {
    --spacing-section: 56px;
    --spacing-xxl: 36px;
    --header-height: 56px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  /* ── Type scale: tighter, readable on phone ── */
  .heading-display-xl { font-size: 34px; line-height: 1.12; }
  .heading-display-lg { font-size: 30px; line-height: 1.15; }
  .heading-display-md { font-size: 26px; line-height: 1.18; }
  .heading-display-sm { font-size: 22px; }
  .heading-display-xs { font-size: 19px; }

  /* ── Header ── */
  .menu-toggle {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
  }

  .brand-name {
    font-size: 18px;
  }

  /* Drawer nav: full-height, large tap targets */
  .main-nav {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--spacing-lg) var(--spacing-md);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.28s ease;
    box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.2);
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    gap: 2px;
  }

  .nav-link {
    display: block;
    font-size: 16px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--color-hairline-soft);
  }

  .nav-link.is-active::after {
    bottom: 12px;
  }

  /* ── Hero: editorial left-aligned flow ── */
  .page-section.section-hero {
    min-height: calc(90vh - var(--header-height));
    min-height: calc(90dvh - var(--header-height));
    justify-content: center;
  }

  .hero-band {
    gap: var(--spacing-xxl);
  }

  .hero-content {
    gap: var(--spacing-lg);
    max-width: 100%;
    width: 100%;
  }

  .hero-welcome {
    font-size: 20px;
    margin-bottom: var(--spacing-xs);
  }

  .hero-title {
    font-size: 38px;
    line-height: 1.12;
    letter-spacing: -0.02em;
    white-space: normal;
  }

  .hero-subtitle {
    font-size: 20px;
    line-height: 1.4;
    margin-top: var(--spacing-sm);
  }

  .hero-lead {
    font-size: 16px;
    line-height: 1.65;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
  }

  .hero-actions .btn {
    width: 100%;
    height: 44px;
    font-size: 15px;
  }

  /* ── Framework diagram: horizontally swipeable card ── */
  .hero-visual {
    margin: 0;
    max-width: 100%;
    overflow: hidden;
  }

  .hero-illustration-card.framework-diagram {
    min-height: 320px;
    border-radius: 0;
    padding: var(--spacing-md);
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    max-width: 100vw;
  }

  .hero-illustration-card.framework-diagram::-webkit-scrollbar {
    display: none;
  }

  .hero-illustration-card.framework-diagram svg {
    min-width: 560px;
    width: 560px;
    scroll-snap-align: center;
  }

  /* ── Section headers ── */
  .section-header {
    margin-bottom: var(--spacing-xxl);
  }

  .section-subtitle {
    font-size: 16px;
  }

  /* ── Cards: single column, generous, full content ── */
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .card {
    padding: var(--spacing-lg);
  }

  .card-title {
    font-size: 19px;
  }

  .card-description {
    font-size: 15px;
  }

  /* ── Article list: denser vertical rhythm ── */
  .article-card {
    padding: var(--spacing-lg) 0;
  }

  .article-title {
    font-size: 23px;
  }

  .article-excerpt {
    font-size: 15px;
  }

  /* ── Article detail: comfortable reading column ── */
  .article-detail-title {
    font-size: 30px;
  }

  .article-detail-body {
    font-size: 16px;
    line-height: 1.75;
  }

  .markdown-body h1 { font-size: 28px; }
  .markdown-body h2 { font-size: 23px; }
  .markdown-body h3 { font-size: 20px; }

  .markdown-body pre {
    padding: var(--spacing-md);
    font-size: 13px;
    border-radius: var(--spacing-sm);
    margin-left: calc(-1 * var(--spacing-xs));
    margin-right: calc(-1 * var(--spacing-xs));
  }

  /* ── Architecture diagram ── */
  .architecture-diagram {
    padding: var(--spacing-md);
    margin-left: calc(-1 * var(--spacing-xs));
    margin-right: calc(-1 * var(--spacing-xs));
  }

  .architecture-diagram svg {
    min-width: 100%;
  }

  /* ── About: stacked, avatar inline ── */
  .about-avatar {
    width: 96px;
    height: 96px;
    font-size: 40px;
  }

  .about-name {
    font-size: 26px;
  }

  .about-main p {
    font-size: 15px;
    line-height: 1.7;
  }

  /* About sidebar: stack avatar above name on phone (override 1024px flex) */
  .about-sidebar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  /* ── CTA band ── */
  .cta-band {
    padding: var(--spacing-xxl) var(--spacing-md);
  }

  .cta-band .btn-secondary {
    width: 100%;
  }

  /* ── Footer: folded into compact stack ── */
  .site-footer {
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-left {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .footer-bio {
    border-left: none;
    padding-left: 0;
    max-width: none;
    white-space: normal;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  /* Tilt/mouse effects disabled implicitly by pointer:coarse; nothing to do */
}