/* Letterpress Ink Density Guide - Stylesheet */
:root {
  --color-bg: #FAF6F1;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F0E8DD;
  --color-text: #2C1810;
  --color-text-secondary: #5C4A3A;
  --color-text-muted: #8B7355;
  --color-accent: #8B4513;
  --color-accent-hover: #6B3410;
  --color-accent-light: #D4A574;
  --color-border: #D9C9B6;
  --color-border-light: #EDE4D8;
  --color-success: #4A7C59;
  --color-error: #A0522D;
  --color-focus: #8B4513;
  --font-body: Georgia, 'Times New Roman', serif;
  --font-heading: 'Palatino Linotype', Palatino, serif;
  --font-mono: 'Courier New', Courier, monospace;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(44, 24, 16, 0.08);
  --shadow-md: 0 4px 12px rgba(44, 24, 16, 0.1);
  --shadow-lg: 0 8px 24px rgba(44, 24, 16, 0.12);
  --max-width: 1120px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}

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

a:focus-visible, button:focus-visible, select:focus-visible, input:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-accent);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-size: 14px;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.logo:hover, .logo:focus {
  color: var(--color-accent);
}

.logo-text {
  letter-spacing: -0.01em;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 24px;
}

.main-nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

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

/* Hero */
.hero-section {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--color-border-light);
}

.hero-content {
  max-width: 720px;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 19px;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: 12px;
}

.hero-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Guide Section */
.guide-section {
  padding: 48px 0;
}

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.guide-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.guide-panel h2 {
  font-family: var(--font-heading);
  font-size: 24px;
  margin-bottom: 24px;
  color: var(--color-text);
}

.guide-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
}

.form-group select {
  appearance: none;
  background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235C4A3A' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 14px center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 40px 10px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group select:hover {
  border-color: var(--color-accent-light);
}

.form-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.15);
}

.field-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}

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

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

.btn-secondary {
  background: var(--color-surface-alt);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover, .btn-secondary:focus {
  background: var(--color-border-light);
  border-color: var(--color-accent-light);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn-ghost:hover, .btn-ghost:focus {
  color: var(--color-accent);
  background: var(--color-surface-alt);
}

/* Results */
.results-panel {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
}

.results-empty {
  text-align: center;
  padding: 32px 16px;
  color: var(--color-text-muted);
}

.results-empty svg {
  margin-bottom: 12px;
  opacity: 0.5;
}

.results-content h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  margin-bottom: 16px;
}

.result-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.result-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.result-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  font-weight: 600;
}

.result-value {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.result-unit {
  font-size: 13px;
  color: var(--color-text-muted);
}

.result-notes {
  background: var(--color-surface-alt);
  border-left: 3px solid var(--color-accent-light);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.55;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* Sidebar */
.guide-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 80px;
}

.sidebar-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-block h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.presets-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.presets-empty {
  font-size: 14px;
  color: var(--color-text-muted);
  font-style: italic;
}

.preset-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.preset-item .preset-info {
  flex: 1;
  min-width: 0;
}

.preset-item .preset-name {
  font-weight: 600;
  color: var(--color-text);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preset-item .preset-detail {
  color: var(--color-text-muted);
  font-size: 12px;
}

.preset-item .preset-load {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  white-space: nowrap;
  transition: all var(--transition);
}

.preset-item .preset-load:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.preset-item .preset-delete {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 4px;
  line-height: 1;
  border-radius: 2px;
  transition: color var(--transition);
}

.preset-item .preset-delete:hover {
  color: var(--color-error);
}

.tips-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tips-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.tips-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-accent-light);
  border-radius: 50%;
}

/* Mistakes Section */
.mistakes-section {
  padding: 48px 0;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.mistakes-section h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  margin-bottom: 28px;
  color: var(--color-text);
}

.mistakes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.mistake-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.mistake-card h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.mistake-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Reference Section */
.reference-section {
  padding: 48px 0;
}

.reference-section h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  margin-bottom: 28px;
  color: var(--color-text);
}

.reference-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.reference-text p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

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

.reference-table-wrap {
  overflow-x: auto;
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.reference-table caption {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  text-align: left;
  margin-bottom: 12px;
  color: var(--color-text);
}

.reference-table th,
.reference-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.reference-table th {
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-surface-alt);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.reference-table td {
  color: var(--color-text-secondary);
}

.reference-table tbody tr:hover {
  background: var(--color-surface-alt);
}

/* FAQ Section */
.faq-section {
  padding: 48px 0;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border-light);
}

.faq-section h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  margin-bottom: 28px;
  color: var(--color-text);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-toggle {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 16px 20px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background var(--transition);
}

.faq-toggle:hover {
  background: var(--color-surface-alt);
}

.faq-toggle::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-toggle[aria-expanded="true"]::after {
  content: "−";
}

.faq-item dd {
  padding: 0 20px 16px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Footer */
.site-footer {
  background: var(--color-text);
  color: var(--color-accent-light);
  padding: 40px 0 24px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-about p {
  font-size: 14px;
  line-height: 1.55;
  max-width: 600px;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
}

.footer-nav a {
  color: var(--color-accent-light);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition);
}

.footer-nav a:hover, .footer-nav a:focus {
  color: #fff;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 16px;
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .guide-sidebar,
  .result-actions,
  .faq-section,
  .mistakes-section,
  .hero-section {
    display: none;
  }

  .guide-panel {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .guide-form {
    display: none;
  }

  .results-panel {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
  }

  .result-cards {
    grid-template-columns: repeat(4, 1fr);
  }

  body {
    font-size: 12px;
    color: #000;
    background: #fff;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .reference-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .hero-section {
    padding: 36px 0 32px;
  }

  .guide-panel {
    padding: 20px;
  }

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

  .guide-sidebar {
    grid-template-columns: 1fr;
  }

  .mistakes-grid {
    grid-template-columns: 1fr;
  }

  .main-nav ul {
    gap: 16px;
  }

  .logo-text {
    font-size: 16px;
  }
}

@media (max-width: 400px) {
  .result-cards {
    grid-template-columns: 1fr;
  }

  .result-actions {
    flex-direction: column;
  }

  .result-actions .btn {
    width: 100%;
  }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}