/* Loom Knot Density Calculator - warm woven theme */
:root {
  --bg: #FFF8F0;
  --surface: #FFFFFF;
  --primary: #8B5E3C;
  --primary-dark: #6B3F1F;
  --secondary: #D9B382;
  --accent: #C96F4A;
  --text: #2C2C2C;
  --text-light: #5A5A5A;
  --border: #E0D6C8;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 12px;
  --font-main: 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Trebuchet MS', 'Segoe UI', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

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

/* Header */
.site-header {
  background-color: var(--surface);
  border-bottom: 2px solid var(--border);
  padding: 10px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-family: var(--font-main);
  font-size: 1.4rem;
  font-weight: bold;
}

.logo svg {
  flex-shrink: 0;
}

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

.main-nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 6px;
  transition: background-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  background-color: var(--bg);
  color: var(--primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  font-size: 1.5rem;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #F5E6D3 0%, #EAD9C2 100%);
  padding: 60px 0;
  text-align: center;
  border-bottom: 2px solid var(--border);
}

.hero h1 {
  font-family: var(--font-main);
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--primary-dark);
}

.lead {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 25px;
  color: var(--text-light);
}

.button {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 25px;
  font-weight: bold;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  font-size: 1rem;
  transition: all 0.2s;
}

.button.primary {
  background-color: var(--primary);
  color: white;
}

.button.primary:hover {
  background-color: var(--primary-dark);
}

.button.secondary {
  background-color: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.button.secondary:hover {
  background-color: var(--primary);
  color: white;
}

/* Calculator section */
.calculator-section {
  padding: 50px 0;
}

.calculator-section h2,
.presets-section h2,
.saved-section h2,
.reference-section h2,
.faq-section h2 {
  font-family: var(--font-main);
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  background-color: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px;
  border: 1px solid var(--border);
}

.calc-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

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

.form-group label {
  font-weight: bold;
  margin-bottom: 5px;
}

.form-group input {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  background-color: var(--bg);
}

.form-group input:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

.hint {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 5px;
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.error-message {
  color: #B00020;
  font-weight: bold;
  padding: 10px;
  background-color: #FDECEA;
  border-radius: 6px;
}

.results-panel {
  background-color: var(--bg);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}

.results-panel h3 {
  font-family: var(--font-main);
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--primary-dark);
}

.result-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 5px;
}

.result-item dt {
  font-weight: bold;
}

.result-item dd {
  font-size: 1.2rem;
  color: var(--primary);
}

.density-visual {
  margin: 20px 0;
}

.density-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14px, 1fr));
  gap: 2px;
  background-color: #EAD9C2;
  padding: 5px;
  border-radius: 4px;
  min-height: 80px;
}

.density-grid .dot {
  aspect-ratio: 1;
  background-color: var(--primary);
  border-radius: 1px;
}

.visual-caption {
  font-size: 0.8rem;
  text-align: center;
  color: var(--text-light);
  margin-top: 5px;
}

/* Presets */
.presets-section {
  padding: 40px 0;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.preset-card {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 15px;
  cursor: pointer;
  text-align: left;
  transition: transform 0.2s, box-shadow 0.2s;
  font-family: var(--font-sans);
}

.preset-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.preset-name {
  display: block;
  font-weight: bold;
  font-size: 1.1rem;
  color: var(--primary-dark);
  margin-bottom: 5px;
}

.preset-desc {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* Saved projects */
.saved-section {
  padding: 40px 0;
}

.saved-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.saved-list li {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.saved-project-info {
  font-weight: bold;
}

.saved-project-actions {
  display: flex;
  gap: 10px;
}

.saved-project-actions button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.9rem;
}

.saved-project-actions button:hover {
  background-color: var(--bg);
}

.empty-state {
  color: var(--text-light);
  font-style: italic;
  margin-top: 15px;
}

/* Reference */
.reference-section {
  padding: 40px 0;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.reference-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  margin-top: 20px;
}

.reference-block {
  background-color: var(--bg);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}

.reference-block h3 {
  font-family: var(--font-main);
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.reference-block ul {
  margin-left: 20px;
  margin-bottom: 10px;
}

.reference-block li {
  margin-bottom: 5px;
}

/* FAQ */
.faq-section {
  padding: 40px 0;
}

.faq-list {
  max-width: 800px;
  margin-top: 20px;
}

.faq-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 10px;
  padding: 10px 15px;
}

.faq-item summary {
  font-weight: bold;
  cursor: pointer;
  color: var(--primary-dark);
  font-size: 1.1rem;
}

.faq-item p {
  margin-top: 10px;
}

/* Footer */
.site-footer {
  background-color: var(--surface);
  border-top: 2px solid var(--border);
  padding: 30px 0;
  text-align: center;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

.footer-nav a {
  color: var(--text);
  text-decoration: none;
}

.footer-nav a:hover {
  text-decoration: underline;
}

.footer-note {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.version {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .main-nav {
    display: none;
    width: 100%;
  }
  .main-nav.open {
    display: block;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 5px;
    margin-top: 10px;
  }
  .menu-toggle {
    display: block;
    position: absolute;
    top: 15px;
    right: 20px;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .lead {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .form-actions {
    flex-direction: column;
  }
  .button {
    width: 100%;
    text-align: center;
  }
  .preset-grid {
    grid-template-columns: 1fr;
  }
  .reference-content {
    grid-template-columns: 1fr;
  }
}



/* 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;
}