/* ============================================
   Tyler Wince — AUCTION HOUSE CATALOGUE Theme
   Fine art auction meets personal site:
   cream parchment, dark sidebar, lot numbers,
   elegant Cormorant serifs, antique gold.
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garant:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,600&family=Lora:ital,wght@0,400;0,500;1,400&family=Courier+Prime:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  /* Typography */
  --font-display: 'Cormorant Garant', Georgia, serif;
  --font-body: 'Lora', Georgia, serif;
  --font-sans: 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier Prime', 'Courier New', monospace;
  --font-system: var(--font-sans);
  --font-hand: var(--font-display);

  /* Auction House Palette */
  --color-cream: #F5F0E8;
  --color-parchment: #EDE6D8;
  --color-vellum: #E3DBCB;
  --color-white: #FDFAF5;
  --color-ink: #1A1714;
  --color-ink-mid: #2E2923;
  --color-ink-soft: #52493E;
  --color-muted: #8E8378;
  --color-ghost: #B8B0A5;
  --color-border: #CEC6B8;
  --color-border-light: #E0D8CE;
  --color-gold: #8C6520;
  --color-gold-light: #B8842A;
  --color-gold-pale: #F0DFB8;
  --color-red: #7A2018;
  --color-red-soft: #992C1E;
  --color-green: #2C5836;

  /* Sidebar */
  --color-sidebar-bg: #1A1714;
  --color-sidebar-border: #2A2520;
  --color-sidebar-surface: #211E1A;
  --color-sidebar-text: #CEC6B8;
  --color-sidebar-muted: #66605A;
  --color-sidebar-accent: #B8842A;
  --color-sidebar-active-bg: #252018;

  /* Semantic aliases */
  --color-bg: var(--color-cream);
  --color-surface: var(--color-white);
  --color-surface-dark: var(--color-parchment);
  --color-surface-mid: var(--color-vellum);
  --color-surface-elevated: var(--color-white);
  --color-accent: var(--color-gold);
  --color-accent-light: var(--color-gold-light);
  --color-accent-wash: var(--color-gold-pale);
  --color-paper: var(--color-white);
  --color-panel: var(--color-white);
  --color-panel-hover: var(--color-cream);
  --color-panel-border: var(--color-border);
  --color-panel-border-bright: var(--color-gold);
  --color-text-primary: var(--color-ink);
  --color-text-secondary: var(--color-ink-soft);
  --color-text-tertiary: var(--color-muted);
  --color-rule-light: var(--color-border-light);
  --color-paper-shadow: rgba(26, 23, 20, 0.10);
  --color-surface-glass: rgba(245, 240, 232, 0.95);
  --color-surface-glow: rgba(140, 101, 32, 0.05);
  /* Cross-theme aliases so inner layouts don't break */
  --color-cyan: var(--color-gold);
  --color-cyan-dim: var(--color-gold-pale);
  --color-amber: var(--color-gold);
  --color-magenta: var(--color-red-soft);
  --color-purple: var(--color-ink-soft);
  --color-purple-dim: rgba(82, 73, 62, 0.08);
  --color-abyss: var(--color-ink);
  --color-deep: var(--color-ink-mid);
  --color-sand: var(--color-gold);
  --color-navy: var(--color-ink);
  --color-navy-light: var(--color-ink-mid);
  --color-rose: var(--color-red-soft);
  --color-rose-dim: rgba(153, 44, 30, 0.08);
  --color-rose-glow: rgba(153, 44, 30, 0.04);
  --color-seal: var(--color-gold);
  --color-ribbon: var(--color-gold);
  --color-wine: var(--color-red);
  --color-blush: var(--color-cream);
  --color-lace: rgba(140, 101, 32, 0.04);
  --color-pink: var(--color-red-soft);
  --color-pink-light: var(--color-gold-pale);
  --color-titlebar: var(--color-parchment);
  --color-green-dim: rgba(44, 88, 54, 0.1);
  --color-green-light: var(--color-green);
  --color-green-wash: rgba(44, 88, 54, 0.05);
  --color-red-dark: var(--color-red);
  --color-red-dim: rgba(122, 32, 24, 0.08);
  --color-gold-dim: var(--color-gold-pale);
  --line-red: var(--color-red);
  --line-blue: var(--color-gold);
  --line-green: var(--color-green);
  --line-gold: var(--color-gold);

  /* Layout */
  --sidebar-width: 232px;
  --nav-height: 56px;
  --max-width-text: 660px;
  --max-width-content: 860px;
  --max-width-wide: 1020px;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 48px;
  --space-12: 64px;
  --space-16: 80px;
  --space-20: 96px;

  /* Sharp corners — auction house precision */
  --border-radius: 0px;
  --border-radius-lg: 0px;
  --border-radius-xl: 0px;
  --border-radius-full: 0px;

  /* Shadows */
  --shadow-sm: 0 1px 4px rgba(26, 23, 20, 0.07);
  --shadow-md: 0 3px 12px rgba(26, 23, 20, 0.10);
  --shadow-lg: 0 8px 32px rgba(26, 23, 20, 0.12);
  --shadow-glow-cyan: 0 2px 8px rgba(140, 101, 32, 0.14);
  --shadow-glow-magenta: 0 2px 8px rgba(153, 44, 30, 0.12);
  --shadow-glow-amber: 0 2px 8px rgba(140, 101, 32, 0.14);
  --shadow-letter: 0 4px 20px rgba(26, 23, 20, 0.12);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms ease;
  --transition-base: 240ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-cream);
  line-height: 1.65;
  overflow-x: hidden;
}

::selection {
  background: var(--color-gold-pale);
  color: var(--color-ink);
}

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

a:hover {
  color: var(--color-gold-light);
  text-shadow: none;
}

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

strong {
  color: var(--color-ink);
  font-weight: 600;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  line-height: 1.1;
  font-family: var(--font-display);
  color: var(--color-ink);
  font-weight: 600;
}

p {
  margin: 0 0 1em;
  color: var(--color-ink-soft);
}

ul, ol {
  margin: 0 0 1.2em 1.2em;
  color: var(--color-ink-soft);
}

li {
  margin-bottom: 0.35em;
}

li::marker {
  color: var(--color-gold);
}

code {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--color-parchment);
  border: 1px solid var(--color-border);
  padding: 2px 6px;
  border-radius: 0;
  color: var(--color-ink-mid);
}

pre {
  position: relative;
  margin: 1.5rem 0;
  padding: 20px;
  overflow-x: auto;
  background: var(--color-parchment);
  color: var(--color-ink);
  font-size: 0.87rem;
  border: 1px solid var(--color-border);
  border-radius: 0;
  border-left: 3px solid var(--color-gold);
}

pre code {
  border: none;
  background: transparent;
  padding: 0;
  color: inherit;
}

blockquote {
  margin: 1.5rem 0;
  padding: 20px 24px;
  background: var(--color-parchment);
  border-left: 3px solid var(--color-gold);
  position: relative;
}

blockquote::before {
  content: none;
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ---- Utilities ---- */
.mb-3 { margin-bottom: var(--space-3); }
.mb-6 { margin-bottom: var(--space-6); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

/* ============================================
   SITE SHELL — Two-column: sidebar + content
   ============================================ */

.site-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* ---- Sidebar ---- */
.auction-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 28px 20px 24px;
}

.sidebar-brand {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-sidebar-border);
}

.brand-monogram {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-sidebar-accent);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.brand-monogram:hover {
  background: var(--color-gold-light);
  color: var(--color-ink);
}

.brand-text {
  min-width: 0;
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-sidebar-text);
  line-height: 1.2;
}

.brand-tagline {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--color-sidebar-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 3px;
}

/* ---- Sidebar Nav ---- */
.nav-section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-sidebar-muted);
  margin-bottom: 10px;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  color: var(--color-sidebar-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-sidebar-accent);
  border-left-color: var(--color-sidebar-accent);
  background: var(--color-sidebar-active-bg);
  text-shadow: none;
}

.site-nav a.active {
  color: var(--color-sidebar-accent);
  border-left-color: var(--color-sidebar-accent);
  background: var(--color-sidebar-active-bg);
  font-style: italic;
  font-weight: 500;
}

.sidebar-provenance {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--color-sidebar-border);
}

.sidebar-provenance p {
  font-family: var(--font-display);
  font-size: 12px;
  font-style: italic;
  color: var(--color-sidebar-muted);
  margin: 0;
  line-height: 1.5;
}

.sidebar-est {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-sidebar-muted);
  margin-top: 4px;
  opacity: 0.6;
}

/* ---- Mobile topbar (hidden on desktop) ---- */
.mobile-topbar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-sidebar-bg);
  border-bottom: 1px solid var(--color-sidebar-border);
  z-index: 200;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.mobile-brand-link {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-sidebar-text);
  text-decoration: none;
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-nav-btn span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-sidebar-text);
  transition: all var(--transition-fast);
}

/* ---- Sidebar backdrop — always fixed so it doesn't affect grid ---- */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(26, 23, 20, 0.55);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.sidebar-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-close {
  display: none;
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: 1px solid var(--color-sidebar-border);
  color: var(--color-sidebar-muted);
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 14px;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  line-height: 1;
}

.sidebar-close:hover {
  color: var(--color-sidebar-text);
  border-color: var(--color-sidebar-muted);
}

/* ---- Legacy / compat ---- */
.site-header { /* sidebar takes this role now */ }
.sidebar-footer { display: none; }
.nav-toggle { display: none; }

/* ---- Main Content ---- */
.main-content-area {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.main-inner {
  flex: 1;
  padding: 44px clamp(20px, 4vw, 56px) 0;
}

/* ---- AI Design Banner ---- */
.ai-design-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0 10px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--color-border-light);
}

.ai-design-banner span {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.ai-design-banner a {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.ai-design-banner a:hover {
  color: var(--color-gold-light);
}

/* ---- Footer ---- */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px clamp(20px, 4vw, 56px);
  border-top: 1px solid var(--color-border);
  margin-top: 72px;
}

.footer-tagline {
  font-family: var(--font-display);
  font-size: 13px;
  font-style: italic;
  color: var(--color-muted);
  margin: 0;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-links li {
  margin: 0;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-gold);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---- Content Wrappers ---- */
.content-wrapper,
.content-wrapper-narrow {
  width: 100%;
  margin: 0 auto;
  padding: var(--space-10) 0;
}

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

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

/* ---- Panel Component ---- */
.panel {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 0;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.panel:hover {
  border-color: var(--color-gold);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-ink);
  margin: 0;
  font-weight: 500;
}

.panel-indicator {
  width: 5px;
  height: 5px;
  flex-shrink: 0;
  background: var(--color-gold);
}

.panel-indicator-cyan,
.panel-indicator-green {
  background: var(--color-green);
}

.panel-indicator-amber {
  background: var(--color-gold);
}

.panel-action {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold);
}

.panel-body {
  padding: 16px;
}

/* ---- Link Utilities ---- */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  text-decoration: none;
}

.link-arrow::after {
  content: '\2192';
  transition: transform var(--transition-fast);
}

.link-arrow:hover {
  color: var(--color-gold-light);
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-ink);
  color: var(--color-cream);
  padding: 11px 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid var(--color-ink);
  transition: all var(--transition-fast);
}

.button:hover {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-ink);
  text-shadow: none;
}

.button-secondary {
  background: transparent;
  color: var(--color-ink);
  border: 2px solid var(--color-border);
}

.button-secondary:hover {
  background: var(--color-parchment);
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.divider {
  height: 1px;
  border: none;
  background: var(--color-border);
  margin: var(--space-10) 0;
}

/* ---- Post Layout ---- */
.post {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.post::before {
  content: none;
}

.post-header {
  margin-bottom: 44px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.05;
  font-weight: 600;
  color: var(--color-ink);
  margin: 0 0 10px;
}

.post-description {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  font-style: italic;
  color: var(--color-ink-soft);
  line-height: 1.5;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-top: 14px;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.82;
  max-width: var(--max-width-text);
  color: var(--color-ink-soft);
}

.post-content h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.post-content h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-top: 2rem;
}

.post-content img {
  margin: 2rem 0;
  border: 1px solid var(--color-border);
}

.post-footer {
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.post-footer-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---- Book List Items ---- */
.book-item {
  padding: 12px 8px;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  font-size: 14px;
  transition: background var(--transition-fast), padding var(--transition-fast);
}

.book-item:hover {
  background: var(--color-gold-pale);
}

.book-item:last-child {
  border-bottom: none;
}

.book-listing-main {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.book-depth-dot {
  width: 4px;
  height: 4px;
  background: var(--color-gold);
  flex-shrink: 0;
  align-self: center;
}

.five-star-book .book-depth-dot {
  background: var(--color-gold-light);
}

.has-notes .book-depth-dot {
  background: var(--color-ink);
}

.book-title-link {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
}

.book-title-link:hover {
  color: var(--color-gold);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.book-title {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
}

.note-icon {
  font-size: 10px;
  vertical-align: super;
  color: var(--color-gold);
}

.book-author {
  font-family: var(--font-body);
  font-size: 13px;
  font-style: italic;
  color: var(--color-muted);
}

.book-rating {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gold);
  white-space: nowrap;
}

.book-rating .stars {
  letter-spacing: 0.05em;
}

.book-rating .currently-reading {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-green);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.book-rating .unrated-text {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-muted);
  text-transform: uppercase;
}

/* ---- Code Copy Button ---- */
.code-copy-button {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--color-ink);
  color: var(--color-cream);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  cursor: pointer;
  opacity: 0;
  border: none;
  transition: opacity var(--transition-fast);
}

pre:hover .code-copy-button {
  opacity: 1;
}

.code-copy-button:hover {
  background: var(--color-gold);
  color: var(--color-ink);
}

/* ---- Animations ---- */
.animate-in {
  animation: catalogueReveal 500ms var(--ease-out) both;
}

.delay-1,
.animate-in-delay-1 {
  animation-delay: 80ms;
}

.delay-2 {
  animation-delay: 160ms;
}

.delay-3 {
  animation-delay: 240ms;
}

.reveal-ready[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 480ms ease, transform 480ms var(--ease-out);
}

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

@keyframes catalogueReveal {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1; }
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-4px); }
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--color-green);
  display: inline-block;
}

.keyboard-nav *:focus {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .site-shell {
    grid-template-columns: 1fr;
  }

  .auction-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    height: 100vh;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: 300;
  }

  .auction-sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-close {
    display: flex;
  }

  .mobile-topbar {
    display: flex;
  }

  .main-content-area {
    padding-top: var(--nav-height);
  }

  .main-inner {
    padding-top: 28px;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  .ai-design-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-bottom: 32px;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 14px;
  }

  .post-title {
    font-size: 27px;
  }
}