/**
 * Design system — personal dev site
 * Palette: single accent + neutrals (Stripe/Linear-adjacent, dark)
 * Spacing: 8px scale (--space-1 … --space-16)
 * Type: Inter (UI) + JetBrains Mono (labels/code only)
 */

:root {
  /* Primary — one accent only (readable on dark, not loud) */
  --color-primary: #5b6ef7;
  --color-primary-hover: #6f80f8;
  --color-primary-muted: rgba(91, 110, 247, 0.16);
  --color-primary-subtle: rgba(91, 110, 247, 0.1);

  /* Neutrals — layered: base < surface < elevated */
  --color-bg: #07080a;
  --color-surface: #0e1016;
  --color-elevated: #151922;
  --color-border: rgba(255, 255, 255, 0.085);
  --color-border-strong: rgba(255, 255, 255, 0.13);
  --color-text: #f5f5f7;
  --color-text-secondary: #b9b9c6;
  --color-text-muted: #8b8b98;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --leading-tight: 1.15;
  --leading-snug: 1.35;
  --leading-normal: 1.55;
  --tracking-tight: -0.02em;

  /* 8px scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-14: 3.5rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 32px rgba(0, 0, 0, 0.38);
  --shadow-card: 0 0 0 1px var(--color-border), 0 12px 40px rgba(0, 0, 0, 0.32);
  --shadow-layer: 0 1px 0 rgba(255, 255, 255, 0.05) inset, 0 14px 48px rgba(0, 0, 0, 0.4);
  --shadow-code: inset 0 1px 0 rgba(255, 255, 255, 0.06);

  --header-h: 64px;
  --container: 1120px;
  --transition: 0.18s ease;

  /* Blog article column — readable, room for code/diagrams */
  --article-content-max: min(900px, 90vw);
  --article-content-max-tablet: min(720px, 92vw);
  --article-body-leading: 1.72;
  --article-body-gap: var(--space-6);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

/* -------------------------------------------------------------------------
   Layout primitives
   ------------------------------------------------------------------------- */

.ds-container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (max-width: 640px) {
  .ds-container {
    padding-inline: var(--space-4);
  }
}

.ds-section {
  padding-block: var(--space-24);
}

.ds-section--tight {
  padding-block: var(--space-20);
}

.ds-section-header {
  margin-bottom: var(--space-12);
  max-width: 42rem;
}

.ds-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.ds-h1 {
  font-size: clamp(var(--text-3xl), 4vw + 1rem, var(--text-5xl));
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

.ds-h2 {
  font-size: clamp(var(--text-2xl), 2vw + 0.5rem, var(--text-3xl));
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.ds-lede {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  margin-top: var(--space-4);
}

.ds-muted {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* -------------------------------------------------------------------------
   Site header / nav
   ------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(7, 8, 10, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-logo {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.site-logo:hover {
  color: var(--color-primary);
  transition: color var(--transition);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.site-nav a:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
}

.site-nav a.is-active {
  color: var(--color-text);
  background: var(--color-primary-muted);
}

/* Mobile menu */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    width: min(300px, 100%);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateX(100%);
    transition: transform 0.22s ease;
    gap: 0;
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .site-nav a {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */

.hero {
  padding-top: calc(var(--header-h) + var(--space-16));
  padding-bottom: var(--space-16);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 110, 247, 0.12), transparent 55%);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr minmax(240px, 320px);
  gap: var(--space-12);
  align-items: center;
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__meta {
    justify-content: center;
  }

  .hero__portrait {
    margin-inline: auto;
  }
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 36ch;
  margin-bottom: var(--space-6);
}

@media (max-width: 900px) {
  .hero__subtitle {
    max-width: none;
  }
}

.hero__pitch {
  font-size: var(--text-base);
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: var(--space-6);
}

.hero__list {
  list-style: none;
  margin-bottom: var(--space-6);
}

.hero__list li {
  position: relative;
  padding-left: var(--space-5);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: left;
}

@media (max-width: 900px) {
  .hero__list {
    display: inline-block;
    text-align: left;
  }
}

.hero__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-primary);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.hero__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero__portrait {
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  aspect-ratio: 1;
  max-width: 280px;
}

.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding-inline: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn--secondary {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--color-text-muted);
}

/* -------------------------------------------------------------------------
   Cards
   ------------------------------------------------------------------------- */

.card {
  background: var(--color-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  height: 100%;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: rgba(91, 110, 247, 0.28);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.card__body {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.grid-skills {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

/* Project card */
.project-card {
  background: var(--color-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: rgba(91, 110, 247, 0.25);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.project-card__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface);
}

.project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.project-card:hover .project-card__media img {
  transform: scale(1.03);
}

.project-card__body {
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  line-height: var(--leading-snug);
}

/* Blog */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

.blog-card {
  display: flex;
  flex-direction: column;
}

.blog-card .card__body {
  flex: 1;
}

.blog-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
}

.blog-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  margin-top: auto;
  padding-top: var(--space-4);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.blog-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.blog-actions {
  margin-top: var(--space-10);
  text-align: center;
}

/* Experience / contact strip */
.exp-list {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
}

.exp-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.exp-row:last-child {
  border-bottom: 0;
}

.exp-row__role {
  font-weight: 600;
  font-size: var(--text-sm);
}

.exp-row__co {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.exp-row__meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.contact-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-elevated);
  transition: border-color var(--transition), background var(--transition);
}

.contact-link:hover {
  border-color: rgba(91, 110, 247, 0.35);
  background: var(--color-surface);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border-strong);
  padding-block: var(--space-12);
  background: var(--color-elevated);
  box-shadow: 0 -1px 0 rgba(255, 255, 255, 0.04);
}

.site-footer__social {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}

.site-footer__social a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.site-footer__social a:hover {
  color: var(--color-primary);
}

.site-footer__copy {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* -------------------------------------------------------------------------
   Utilities
   ------------------------------------------------------------------------- */

.text-center {
  text-align: center;
}

.ds-section-header--narrow {
  margin-inline: auto;
  max-width: 36rem;
  text-align: center;
}

.inline-link {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.inline-link:hover {
  color: var(--color-primary-hover);
}

.mb-8 {
  margin-bottom: var(--space-8);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}

.text-emphasis {
  color: var(--color-text);
  font-weight: 600;
}

.card__heading {
  font-size: var(--text-xl);
  margin-bottom: var(--space-5);
  letter-spacing: var(--tracking-tight);
}

.section-stack {
  margin-top: var(--space-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: 102;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: var(--color-primary);
}

.scroll-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-elevated);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition), border-color var(--transition);
  z-index: 90;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  border-color: var(--color-border-strong);
}

/* Easter egg (keep minimal) */
.matrix-rain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.matrix-rain.visible {
  opacity: 0.06;
}

.secret-section {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--color-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  max-width: 400px;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 1001;
}

.secret-section.visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.theme-toggle {
  position: fixed;
  top: 80px;
  right: var(--space-4);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-elevated);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle.visible {
  opacity: 0.5;
}

.theme-toggle:hover {
  opacity: 1;
}

.hidden-flag {
  position: fixed;
  opacity: 0;
  pointer-events: none;
  z-index: 9999;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.hidden-flag.visible {
  opacity: 0.9;
}

.onion-section {
  position: fixed;
  bottom: -100%;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-8);
  transition: bottom 0.35s ease;
  z-index: 1000;
  text-align: center;
}

.onion-section.visible {
  bottom: 0;
}

.onion-content {
  max-width: 520px;
  margin-inline: auto;
  position: relative;
}

.close-onion {
  position: absolute;
  top: 0;
  right: 0;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: var(--text-xl);
  line-height: 1;
}

.close-onion:hover {
  color: var(--color-text);
}

.onion-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  word-break: break-all;
  color: var(--color-text-secondary);
  margin-top: var(--space-4);
}

.about-link-wrap {
  margin-top: var(--space-8);
  text-align: center;
}

/* -------------------------------------------------------------------------
   About page
   ------------------------------------------------------------------------- */

.about-page {
  padding-top: calc(var(--header-h) + var(--space-12));
  padding-bottom: var(--space-20);
}

.about-hero {
  margin-bottom: var(--space-16);
}

.about-hero__grid {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 280px);
  gap: var(--space-12);
  align-items: start;
}

.about-hero__portrait {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  aspect-ratio: 1;
  max-width: 280px;
  box-shadow: var(--shadow-card);
}

.about-hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-chip {
  margin-top: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.about-chip__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.about-chip__title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.about-chip__body {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  margin: 0;
}

.about-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .about-hero__grid {
    grid-template-columns: 1fr;
  }

  .about-hero__portrait {
    margin-inline: auto;
  }

  .about-grid-2 {
    grid-template-columns: 1fr;
  }
}

.about-list {
  list-style: none;
}

.about-list > li {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-elevated);
  margin-bottom: var(--space-3);
}

.about-list > li:last-child {
  margin-bottom: 0;
}

.about-list strong {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.about-list p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  margin: 0;
}

.link-list-about {
  list-style: none;
  display: grid;
  gap: 0;
}

.link-list-about li {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.link-list-about li:first-child {
  padding-top: 0;
}

.link-list-about li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.link-list-about .link-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.link-list-about a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
}

.link-list-about a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-prose {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  max-width: 65ch;
}

.about-prose p + p {
  margin-top: var(--space-4);
}

/* -------------------------------------------------------------------------
   Blog archive (/blog/)
   ------------------------------------------------------------------------- */

.blog-archive {
  padding-top: calc(var(--header-h) + var(--space-12));
  padding-bottom: var(--space-24);
}

.blog-breadcrumbs {
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.blog-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.blog-breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-2);
  color: var(--color-text-muted);
  opacity: 0.55;
}

.blog-breadcrumbs a {
  color: var(--color-primary);
  font-weight: 500;
}

.blog-breadcrumbs a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.blog-breadcrumbs [aria-current="page"] {
  color: var(--color-text-secondary);
  font-weight: 500;
  word-break: break-word;
}

.blog-archive__header {
  margin-bottom: var(--space-10);
  max-width: 40rem;
}

.blog-archive__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.blog-archive__shell {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-layer);
}

.blog-post-list {
  list-style: none;
  display: grid;
  gap: var(--space-3);
}

.blog-post-card {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-elevated);
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.035) inset;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.blog-post-card:hover {
  border-color: rgba(91, 110, 247, 0.32);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.blog-post-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.blog-post-card__meta .sep {
  opacity: 0.45;
}

.blog-post-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  line-height: var(--leading-snug);
}

.blog-post-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

.blog-status {
  font-size: var(--text-sm);
  margin: 0;
}

.blog-status--loading {
  color: var(--color-text-muted);
}

.blog-status--error {
  color: #f87171;
}

/* -------------------------------------------------------------------------
   Blog post (single article)
   ------------------------------------------------------------------------- */

.blog-post-page {
  padding-top: calc(var(--header-h) + var(--space-10));
  padding-bottom: var(--space-24);
}

.article-shell {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: var(--space-8);
  width: 100%;
  max-width: var(--article-content-max);
  margin-inline: auto;
  min-height: 280px;
  box-shadow: var(--shadow-layer);
  box-sizing: border-box;
}

@media (max-width: 1024px) {
  .article-shell {
    max-width: var(--article-content-max-tablet);
  }
}

@media (max-width: 640px) {
  .article-shell {
    padding: var(--space-5);
    max-width: min(100%, calc(100vw - var(--space-8)));
  }
}

.blog-post-page .blog-breadcrumbs {
  margin-bottom: var(--space-6);
}

.article-header-block {
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.article-back {
  display: inline-flex;
  margin-bottom: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
}

.article-back:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-meta-row {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.article-meta-row .sep {
  opacity: 0.45;
}

.article-meta-row time {
  font-variant-numeric: tabular-nums;
}

.article-title {
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.article-summary-text {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
  margin: 0;
}

/* Markdown body */
.article-body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  display: grid;
  gap: var(--article-body-gap);
  max-width: 100%;
  width: 100%;
  margin-inline: auto;
  line-height: var(--article-body-leading);
  box-sizing: border-box;
  min-width: 0;
}

.article-body > :first-child {
  margin-top: 0;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
  font-family: var(--font-sans);
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin-bottom: 0;
}

.article-body h1 {
  font-size: var(--text-2xl);
  margin-top: var(--space-12);
}

.article-body h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-14);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.article-body h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-12);
}

.article-body h4 {
  font-size: var(--text-base);
  margin-top: var(--space-10);
}

.article-body > h1:first-child,
.article-body > h2:first-child,
.article-body > h3:first-child,
.article-body > h4:first-child {
  margin-top: 0;
}

.article-body p {
  margin: 0;
  color: var(--color-text-secondary);
  max-width: min(68ch, 100%);
}

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

.article-body a:hover {
  color: var(--color-primary-hover);
}

.article-body ul,
.article-body ol {
  padding-left: var(--space-6);
  margin: 0;
  display: grid;
  gap: var(--space-3);
}

.article-body li {
  padding-left: var(--space-1);
  color: var(--color-text-secondary);
}

.article-body blockquote {
  border-left: 3px solid rgba(91, 110, 247, 0.55);
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-5);
  margin: 0;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(148, 163, 184, 0.14);
  padding: 0.15em 0.45em;
  border-radius: 5px;
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.article-body pre {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-6) var(--space-7);
  border-radius: var(--radius-md);
  background: #0a0c11;
  border: 1px solid var(--color-border-strong);
  font-size: var(--text-sm);
  line-height: 1.62;
  box-shadow: var(--shadow-code);
  max-width: 100%;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.article-body pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  color: #d4d4dc;
  border: none;
}

.article-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-10);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 640px) {
  .article-nav-grid {
    grid-template-columns: 1fr;
  }
}

.article-nav-link {
  display: block;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-elevated);
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.article-nav-link:hover {
  border-color: rgba(91, 110, 247, 0.28);
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}

.article-nav-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.article-nav-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  line-height: var(--leading-snug);
}

/* Notion-like reading: calm rhythm, soft shell */
.blog-archive--notion .blog-archive__header {
  max-width: 36rem;
}

.blog-archive--notion .ds-h1 {
  font-weight: 600;
  letter-spacing: -0.03em;
}

.blog-archive--notion .blog-archive__shell {
  border: none;
  background: transparent;
  padding: 0;
  box-shadow: none;
}

.blog-archive--notion .blog-post-card {
  border-radius: var(--radius-lg);
  border-color: var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.035) inset;
}

.article-shell--notion {
  border: none;
  background: transparent;
  box-shadow: none;
  padding-left: 0;
  padding-right: 0;
  max-width: var(--article-content-max);
  width: 100%;
  margin-inline: auto;
  box-sizing: border-box;
}

@media (max-width: 1024px) {
  .article-shell--notion {
    max-width: var(--article-content-max-tablet);
  }
}

@media (max-width: 640px) {
  .article-shell--notion {
    max-width: min(100%, calc(100vw - var(--space-8)));
  }
}

.blog-post-page--article {
  padding-bottom: var(--space-24);
}

.blog-post-page--article .article-body {
  font-size: var(--text-lg);
  line-height: var(--article-body-leading);
  max-width: 100%;
  width: 100%;
  padding: var(--space-8) var(--space-10) var(--space-12);
  margin-top: var(--space-2);
  margin-inline: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-layer);
  box-sizing: border-box;
  min-width: 0;
}

.blog-post-page--article .article-body p {
  color: var(--color-text-secondary);
  max-width: min(68ch, 100%);
}

.blog-post-page--article .article-title {
  font-weight: 600;
  letter-spacing: -0.03em;
}

@media (max-width: 1024px) {
  .blog-post-page--article .article-body {
    padding-inline: var(--space-8);
  }
}

@media (max-width: 640px) {
  .blog-post-page--article .article-body {
    padding: var(--space-5) var(--space-4) var(--space-8);
  }
}

/* Rich markdown: tables, HR, footnotes, tasks, diagrams */
.article-body .article-hr {
  border: none;
  height: 1px;
  background: var(--color-border-strong);
  margin: var(--space-12) 0;
  max-width: 100%;
}

.article-body .article-img {
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
}

.article-body .article-table-wrap {
  overflow-x: auto;
  margin: var(--space-4) 0;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  min-width: 0;
  border-radius: var(--radius-md);
}

.article-body .article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.article-body .article-table th,
.article-body .article-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.article-body .article-table th {
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-elevated);
}

.article-body .article-table tr:last-child td {
  border-bottom: none;
}

.article-body .article-blockquote {
  margin: 0;
}

.article-body .article-blockquote > *:first-child {
  margin-top: 0;
}

.article-body .article-blockquote > *:last-child {
  margin-bottom: 0;
}

/* Task / checklist (Notion-style) */
.article-body ul.article-task-list,
.article-body ul:has(> li.task-list-item) {
  list-style: none;
  padding-left: 0;
  margin-left: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.article-body .task-list-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  margin-left: 0;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}

.article-body .task-list-item:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--color-border);
}

.article-body .task-list-item.is-checked {
  opacity: 0.92;
}

.article-body .task-list-item.is-checked .task-list-text {
  color: var(--color-text-muted);
}

.article-body .task-list-marker {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.2em;
  border-radius: 5px;
  border: 2px solid var(--color-border-strong);
  background: var(--color-elevated);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
}

.article-body .task-list-item.is-checked .task-list-marker {
  border-color: rgba(91, 110, 247, 0.65);
  background: var(--color-primary-muted);
  box-shadow: none;
}

.article-body .task-list-item.is-checked .task-list-marker::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 45%;
  width: 0.28rem;
  height: 0.55rem;
  border: solid var(--color-primary);
  border-width: 0 2px 2px 0;
  transform: translate(-50%, -50%) rotate(45deg);
}

.article-body .task-list-text {
  flex: 1;
  min-width: 0;
  line-height: var(--leading-snug);
}

.article-body .task-list-text a {
  color: var(--color-primary);
}

/* Table of contents (nav + list from ## Table of Contents) */
.article-body h2.article-heading-toc {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  padding-bottom: 0;
  border-bottom: none;
}

.article-body .article-toc {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  margin: 0 0 var(--space-10);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(91, 110, 247, 0.12), rgba(91, 110, 247, 0.04));
  border: 1px solid rgba(91, 110, 247, 0.22);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2) inset;
}

.article-body .article-toc-list {
  list-style: none;
  margin: 0;
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 0;
  border-radius: calc(var(--radius-lg) - 2px);
  background: var(--color-surface);
}

.article-body .article-toc-list li {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--color-border);
}

.article-body .article-toc-list li:last-child {
  border-bottom: none;
}

.article-body .article-toc-list a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-2);
  margin: 0 calc(-1 * var(--space-2));
  border-radius: var(--radius-sm);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: var(--leading-snug);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.article-body .article-toc-list a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-muted);
  border: 1px solid rgba(91, 110, 247, 0.5);
  flex-shrink: 0;
  opacity: 0.9;
}

.article-body .article-toc-list a:hover {
  color: var(--color-primary-hover);
  background: rgba(91, 110, 247, 0.1);
  transform: translateX(2px);
}

.article-body .article-toc-list a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.article-footnotes {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.article-footnotes__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.article-footnotes__list {
  padding-left: var(--space-6);
  margin: 0;
  display: grid;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.article-footnotes__list p {
  margin: 0;
}

.footnote-backref {
  text-decoration: none;
  margin-left: var(--space-1);
}

.article-mermaid {
  margin: var(--space-6) 0;
  padding: var(--space-6) var(--space-7);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, rgba(91, 110, 247, 0.06) 0%, var(--color-elevated) 48%);
  border: 1px solid rgba(91, 110, 247, 0.18);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, var(--shadow-sm);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.article-body pre.article-pre {
  background: #0a0c11;
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-code);
  max-width: 100%;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.article-body .article-pre code {
  font-size: inherit;
  color: #d4d4dc;
}