/* Mellow Boards Archive — Premium Editorial Design System */

:root {
  --color-bg: #0d0d0d;
  --color-bg-elevated: #161616;
  --color-bg-subtle: #1e1e1e;
  --color-surface: #f5f0e8;
  --color-surface-muted: #e8e2d8;
  --color-text: #f5f0e8;
  --color-text-muted: #a8a29a;
  --color-text-dark: #1a1a1a;
  --color-text-dark-muted: #5c5c5c;
  --color-accent: #c4a35a;
  --color-accent-dim: #8a7340;
  --color-border: rgba(245, 240, 232, 0.12);
  --color-border-dark: rgba(26, 26, 26, 0.12);
  --font-sans: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --font-mono: "Cascadia Code", "Consolas", monospace;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --max-width: 1280px;
  --max-width-narrow: 720px;
  --header-height: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  top: var(--space-sm);
  outline: 2px solid var(--color-surface);
  outline-offset: 2px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.site-logo img {
  width: 28px;
  height: 28px;
}

.site-logo:hover { opacity: 0.85; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-width: 44px;
  min-height: 44px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-nav a {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

/* Hero */
.hero {
  position: relative;
  padding: calc(var(--header-height) + var(--space-lg)) var(--space-md) var(--space-xl);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--space-xl);
  align-items: center;
  min-height: 420px;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-visual {
  position: relative;
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-bg,
.hero-overlay {
  display: none;
}

.hero-meta {
  font-size: 0.6875rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.hero-stat {
  min-width: 100px;
}

.hero-stat-value {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--color-accent);
  display: block;
}

.hero-stat-label {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-visual {
    order: -1;
    max-height: 280px;
  }
}

.hero-lead {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-muted);
  max-width: 36rem;
  line-height: 1.6;
}

/* Sections */
.section {
  padding: var(--space-2xl) var(--space-md);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-size: 0.6875rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
}

.section-light {
  background: var(--color-surface);
  color: var(--color-text-dark);
}

.section-light a { color: var(--color-accent-dim); }
.section-light a:hover { color: var(--color-text-dark); }
.section-light .section-label { color: var(--color-accent-dim); }
.section-light .section-label + h2 { color: var(--color-text-dark); }

.section-dark {
  background: var(--color-bg-elevated);
}

/* Grid layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

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

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

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Cards */
.card {
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  transition: border-color var(--transition), transform var(--transition);
}

.section-light .card {
  border-color: var(--color-border-dark);
  background: #fff;
}

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

.card h3 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.section-light .card p { color: var(--color-text-dark-muted); }

.card-link {
  display: block;
  color: inherit;
}

.card-link:hover h3 { color: var(--color-accent); }

/* Spec table */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.spec-item {
  background: var(--color-bg-elevated);
  padding: var(--space-md);
}

.section-light .spec-item { background: #fff; }

.spec-label {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.section-light .spec-label { color: var(--color-text-dark-muted); }

.spec-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-text);
}

.section-light .spec-value { color: var(--color-text-dark); }

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-xl) - 4px);
  top: 0.5rem;
  width: 9px;
  height: 9px;
  background: var(--color-accent);
  border-radius: 50%;
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.timeline-item h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

/* Page layout */
.page-header {
  padding: calc(var(--header-height) + var(--space-xl)) var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.page-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.breadcrumb {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  opacity: 0.5;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.page-intro {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: var(--max-width-narrow);
  line-height: 1.6;
}

.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.page-content h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  margin: var(--space-xl) 0 var(--space-md);
}

.page-content h3 {
  font-size: 1.25rem;
  margin: var(--space-lg) 0 var(--space-sm);
}

.page-content p {
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
}

.page-content ul, .page-content ol {
  margin: 0 0 var(--space-md) var(--space-lg);
  color: var(--color-text-muted);
}

.page-content li { margin-bottom: var(--space-xs); }

.page-content .lead {
  font-size: 1.25rem;
  color: var(--color-text);
  line-height: 1.6;
}

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

.figure {
  margin: var(--space-xl) 0;
}

.figure img {
  width: 100%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.cards {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 600px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.figure-caption {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
  font-style: italic;
}

.callout {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-subtle);
  margin: var(--space-lg) 0;
}

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

.status-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
}

/* Explore grid */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px;
  background: var(--color-border);
}

.explore-item {
  background: var(--color-bg);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 200px;
  transition: background var(--transition);
}

.explore-item:hover {
  background: var(--color-bg-elevated);
}

.explore-item h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.explore-item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.explore-arrow {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  text-align: left;
  padding: var(--space-md) 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  min-height: 44px;
}

.faq-question:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.faq-answer {
  padding: 0 0 var(--space-md);
  color: var(--color-text-muted);
  display: none;
}

.faq-item.is-open .faq-answer { display: block; }

.faq-icon {
  font-size: 1.5rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.faq-item.is-open .faq-icon { transform: rotate(45deg); }

/* Glossary */
.glossary-term {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.glossary-term dt {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  margin-bottom: var(--space-xs);
}

.glossary-term dd {
  color: var(--color-text-muted);
  margin-left: 0;
}

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

.archive-card {
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.archive-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.archive-card-body {
  padding: var(--space-md);
}

.archive-meta {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--space-md) var(--space-lg);
  background: var(--color-bg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.footer-tagline {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  max-width: 32rem;
  margin-bottom: var(--space-xl);
  font-style: italic;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.footer-col h4 {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.footer-col ul {
  list-style: none;
}

.footer-col li { margin-bottom: 0.5rem; }

.footer-col a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-col a:hover { color: var(--color-text); }

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.disclaimer {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
}

/* Search */
.search-box {
  margin-bottom: var(--space-lg);
}

.search-input {
  width: 100%;
  max-width: 400px;
  padding: 0.75rem 1rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 1rem;
  min-height: 44px;
}

.search-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 0;
  border-color: var(--color-accent);
}

.search-results {
  list-style: none;
  margin-top: var(--space-md);
}

.search-results li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.search-results a {
  color: var(--color-text);
  font-family: var(--font-serif);
}

.search-results .result-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* 404 */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
}

.error-page h1 {
  font-family: var(--font-serif);
  font-size: 6rem;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

/* Responsive nav */
@media (max-width: 1024px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav ul {
    flex-direction: column;
    gap: var(--space-sm);
  }
  .site-nav a {
    display: block;
    padding: var(--space-sm) 0;
    font-size: 0.8125rem;
  }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Image zoom */
.img-zoom {
  overflow: hidden;
}

.img-zoom img {
  transition: transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .img-zoom:hover img { transform: none; }
}