/* ============================================
   Jeremy Lim — Personal Website
   Design System & Core Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Playfair Display', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes — fluid type scale */
  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.3vw, 0.9rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.3vw, 1.05rem);
  --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.4rem, 1.2rem + 1vw, 1.8rem);
  --text-2xl: clamp(1.8rem, 1.5rem + 1.5vw, 2.5rem);
  --text-3xl: clamp(2.2rem, 1.8rem + 2vw, 3.5rem);
  --text-4xl: clamp(2.8rem, 2rem + 3vw, 5rem);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 10rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 720px;
  --max-width-wide: 1400px;
  --nav-height: 60px;
  --border-radius: 6px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Light theme (default) */
  --bg-primary: #fafaf9;
  --bg-secondary: #f5f5f4;
  --bg-tertiary: #e7e5e4;
  --bg-card: #ffffff;
  --bg-overlay: rgba(250, 250, 249, 0.85);
  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-tertiary: #a8a29e;
  --accent: #b45309;
  --accent-hover: #92400e;
  --accent-light: rgba(180, 83, 9, 0.1);
  --border: #e7e5e4;
  --border-light: #f5f5f4;
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow-md: 0 4px 12px rgba(28, 25, 23, 0.06);
  --shadow-lg: 0 12px 40px rgba(28, 25, 23, 0.08);
  --shadow-xl: 0 24px 60px rgba(28, 25, 23, 0.12);
}

[data-theme="dark"] {
  --bg-primary: #0c0a09;
  --bg-secondary: #1c1917;
  --bg-tertiary: #292524;
  --bg-card: #1c1917;
  --bg-overlay: rgba(12, 10, 9, 0.9);
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;
  --text-tertiary: #78716c;
  --accent: #d97706;
  --accent-hover: #f59e0b;
  --accent-light: rgba(217, 119, 6, 0.12);
  --border: #292524;
  --border-light: #1c1917;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.5);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

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

::selection {
  background-color: var(--accent);
  color: #fff;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

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

.text-accent { color: var(--accent); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.font-serif { font-family: var(--font-serif); }
.font-mono { font-family: var(--font-mono); }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 2px 0;
}

.nav__toggle span {
  display: block;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

/* Mobile menu */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: var(--space-2xl) var(--space-lg);
  z-index: 99;
}

.nav__mobile-menu.is-open {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.nav__mobile-menu .nav__link {
  font-size: var(--text-xl);
  text-transform: none;
  letter-spacing: -0.01em;
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }
  .nav__toggle {
    display: flex;
  }
}

/* --- Page Header --- */
.page-header {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-2xl);
}

.page-header__title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

/* --- Hero Section (Home) --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--nav-height) 0 var(--space-3xl);
}

.hero__content {
  max-width: 800px;
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero__greeting::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--accent);
}

.hero__name {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero__description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: var(--space-xl);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.7em 1.6em;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

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

.btn--primary:hover {
  background: var(--accent);
  color: #fff;
}

.btn--outline {
  border: 1.5px solid var(--border);
  color: var(--text-primary);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--ghost {
  color: var(--text-secondary);
  padding: 0.5em 0;
}

.btn--ghost:hover {
  color: var(--accent);
}

.btn svg {
  width: 16px;
  height: 16px;
}

/* --- Section --- */
.section {
  padding: var(--space-3xl) 0;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__header {
  margin-bottom: var(--space-2xl);
}

.section__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section__title {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section__description {
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  max-width: 520px;
}

/* --- Gallery Grid --- */
.gallery-grid {
  columns: 3;
  column-gap: var(--space-md);
}

.gallery-grid__item {
  break-inside: avoid;
  margin-bottom: var(--space-md);
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  background: var(--bg-secondary);
}

.gallery-grid__item img {
  width: 100%;
  display: block;
  transition: transform var(--transition-slow), filter var(--transition-slow);
}

.gallery-grid__item:hover img {
  transform: scale(1.03);
}

.gallery-grid__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg);
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  opacity: 0;
  transition: opacity var(--transition-base);
  transform: translateY(4px);
}

.gallery-grid__item:hover .gallery-grid__overlay {
  opacity: 1;
  transform: translateY(0);
}

.gallery-grid__caption {
  font-size: var(--text-sm);
  font-weight: 500;
}

.gallery-grid__meta {
  font-size: var(--text-xs);
  opacity: 0.8;
  margin-top: var(--space-xs);
}

/* Gallery filter tabs */
.gallery-filters {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.gallery-filter-btn {
  padding: 0.4em 1em;
  font-size: var(--text-sm);
  border-radius: 100px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
}

.gallery-filter-btn:hover,
.gallery-filter-btn.is-active {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

@media (max-width: 900px) {
  .gallery-grid { columns: 2; }
}

@media (max-width: 500px) {
  .gallery-grid { columns: 1; }
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  cursor: zoom-out;
}

.lightbox.is-open {
  display: flex;
}

.lightbox__img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--border-radius);
  object-fit: contain;
  cursor: default;
}

.lightbox__close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  color: #fff;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
  font-size: 1.5rem;
}

.lightbox__close:hover {
  opacity: 1;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  opacity: 0.6;
  font-size: 2rem;
  padding: var(--space-md);
  transition: opacity var(--transition-fast);
}

.lightbox__nav:hover {
  opacity: 1;
}

.lightbox__nav--prev { left: var(--space-md); }
.lightbox__nav--next { right: var(--space-md); }

.lightbox__caption {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  text-align: center;
  font-size: var(--text-sm);
  opacity: 0.8;
  max-width: 600px;
}

/* --- Article / Writing Cards --- */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.article-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.article-card__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
}

.article-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-top: var(--space-sm);
}

.article-card__excerpt {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: var(--space-sm);
}

.article-card__tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.tag {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.2em 0.7em;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

.article-card__readmore {
  font-size: var(--text-sm);
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.article-card__readmore:hover {
  gap: var(--space-sm);
}

.article-card__content {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--text-primary);
  white-space: pre-wrap;
}

.article-card__content p {
  margin-bottom: var(--space-md);
}

.article-card__content p:last-child {
  margin-bottom: 0;
}

/* Featured article (larger) */
.article-card--featured {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.article-card--featured .article-card__image {
  border-radius: var(--border-radius);
  overflow: hidden;
}

.article-card--featured .article-card__image img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

@media (max-width: 700px) {
  .article-card--featured {
    grid-template-columns: 1fr;
  }
}

/* --- Article Detail (prose) --- */
.prose {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.prose h1, .prose h2, .prose h3 {
  font-family: var(--font-serif);
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.prose h1 { font-size: var(--text-3xl); }
.prose h2 { font-size: var(--text-2xl); }
.prose h3 { font-size: var(--text-xl); }

.prose p {
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-lg);
  margin: var(--space-xl) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.prose img {
  border-radius: var(--border-radius);
  margin: var(--space-xl) 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.prose pre {
  background: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: var(--space-xl) 0;
}

.prose pre code {
  background: none;
  padding: 0;
}

.prose ul, .prose ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
  color: var(--text-secondary);
}

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }

.prose li {
  margin-bottom: var(--space-sm);
}

/* --- Links / Social Page --- */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.link-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.link-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.link-card__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 10px;
  font-size: 1.2rem;
}

.link-card__title {
  font-weight: 600;
  font-size: var(--text-base);
  margin-bottom: var(--space-xs);
}

.link-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.link-card__url {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  margin-top: var(--space-sm);
  word-break: break-all;
}

/* Video embeds */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-lg);
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.video-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.video-card__embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
}

.video-card__embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-card__info {
  padding: var(--space-lg);
}

.video-card__title {
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.video-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* --- Name Card / About Section --- */
.namecard {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-2xl);
  align-items: start;
  padding: var(--space-2xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
}

.namecard__photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--border-radius);
  background: var(--bg-secondary);
}

.namecard__name {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}

.namecard__title {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.namecard__bio {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.namecard__details {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
}

.namecard__label {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.namecard__value {
  color: var(--text-primary);
}

.namecard__value a {
  color: var(--accent);
}

.namecard__socials {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.namecard__social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.namecard__social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

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

@media (max-width: 700px) {
  .namecard {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .namecard__photo {
    max-width: 200px;
    margin: 0 auto;
  }
  .namecard__details {
    justify-content: center;
  }
  .namecard__socials {
    justify-content: center;
  }
}

/* --- Recommendations / Quotes --- */
.recommendations {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.recommendation-card {
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  position: relative;
}

.recommendation-card__quote {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.recommendation-card__quote::before {
  content: '\201C';
  font-size: 3rem;
  color: var(--accent);
  line-height: 0;
  display: block;
  margin-bottom: var(--space-sm);
  font-family: var(--font-serif);
}

.recommendation-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.recommendation-card__avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-secondary);
}

.recommendation-card__name {
  font-weight: 600;
  font-size: var(--text-sm);
}

.recommendation-card__role {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* --- Archive --- */
.archive-list {
  border-top: 1px solid var(--border);
}

.archive-year {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  padding: var(--space-lg) 0 var(--space-md);
  color: var(--text-tertiary);
}

.archive-item {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
  transition: background var(--transition-fast);
}

.archive-item:hover {
  background: var(--bg-secondary);
  margin: 0 calc(-1 * var(--space-md));
  padding-left: var(--space-md);
  padding-right: var(--space-md);
  border-radius: var(--border-radius);
}

.archive-item__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.archive-item__title {
  font-weight: 500;
}

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

.archive-item__type {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (max-width: 600px) {
  .archive-item {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }
  .archive-item__type {
    display: none;
  }
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-3xl);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__text {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

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

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.animate-in:nth-child(1) { animation-delay: 0ms; }
.animate-in:nth-child(2) { animation-delay: 100ms; }
.animate-in:nth-child(3) { animation-delay: 200ms; }
.animate-in:nth-child(4) { animation-delay: 300ms; }
.animate-in:nth-child(5) { animation-delay: 400ms; }
.animate-in:nth-child(6) { animation-delay: 500ms; }

/* --- Scroll reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Back to top --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 50;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- Print styles --- */
@media print {
  .nav, .footer, .back-to-top, .theme-toggle {
    display: none !important;
  }
  body {
    color: #000;
    background: #fff;
  }
}