/* Wallpaper Roll Estimator - Styles */
:root {
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F3EDE4;
  --color-primary: #6B4F3A;
  --color-primary-light: #8B6F5A;
  --color-primary-dark: #4B2F1A;
  --color-accent: #C9A96E;
  --color-accent-light: #E9D9BE;
  --color-text: #2C2420;
  --color-text-muted: #6B635C;
  --color-text-light: #9B938C;
  --color-border: #D9CFC4;
  --color-success: #4A7C59;
  --color-error: #B94A4A;
  --color-focus: #6B4F3A;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --max-width: 1200px;
  --transition: 0.2s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover, a:focus { color: var(--color-primary-dark); text-decoration: underline; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
}
.logo:hover, .logo:focus { text-decoration: none; color: var(--color-primary-dark); }
.site-nav { display: flex; gap: 1.5rem; }
.site-nav a { font-size: 0.9rem; font-weight: 500; color: var(--color-text-muted); }
.site-nav a:hover, .site-nav a:focus { color: var(--color-primary); }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  color: #FFF;
  padding: 4rem 0 4.5rem;
  text-align: center;
}
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.2; margin-bottom: 1rem; }
.hero-sub { font-size: 1.1rem; opacity: 0.9; max-width: 560px; margin: 0 auto 2rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.3;
}
.btn:hover, .btn:focus { text-decoration: none; }
.btn-primary { background: var(--color-accent); color: var(--color-primary-dark); border-color: var(--color-accent); }
.btn-primary:hover, .btn-primary:focus { background: var(--color-accent-light); border-color: var(--color-accent-light); }
.btn-secondary { background: var(--color-surface); color: var(--color-primary); border-color: var(--color-border); }
.btn-secondary:hover, .btn-secondary:focus { background: var(--color-surface-alt); border-color: var(--color-primary-light); }
.btn-lg { padding: 0.85rem 2rem; font-size: 1.05rem; }
.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.85rem; }
.btn-icon { padding: 0.3rem 0.6rem; font-size: 1.2rem; line-height: 1; }
.btn-remove-cutout { align-self: flex-end; margin-bottom: 0.2rem; }

/* Calculator Section */
.calculator-section { padding: 3rem 0; }
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 2rem;
  align-items: start;
}

.calc-form-panel {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.calc-form-panel h2 { font-size: 1.3rem; margin-bottom: 1.5rem; color: var(--color-primary); }

.form-group {
  border: none;
  margin-bottom: 1.5rem;
  padding: 0;
}
.form-group legend {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding: 0;
}
.optional { font-weight: 400; color: var(--color-text-light); font-size: 0.85rem; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field label { font-size: 0.85rem; font-weight: 600; color: var(--color-text); }
.field small { font-size: 0.78rem; color: var(--color-text-muted); }

.input-group {
  display: flex;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.input-group:focus-within { border-color: var(--color-focus); }
.input-group input {
  flex: 1;
  border: none;
  padding: 0.55rem 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: transparent;
  min-width: 0;
}
.input-group input:focus { outline: none; }
.input-group select, .unit-static {
  border: none;
  border-left: 1px solid var(--color-border);
  padding: 0.55rem 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  background: var(--color-surface-alt);
  min-width: 60px;
}
.input-group select:focus { outline: none; }
.unit-static { display: flex; align-items: center; justify-content: center; font-size: 0.85rem; }

/* Cutouts */
.cutout-row {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr auto;
  gap: 0.75rem;
  align-items: end;
  padding: 0.75rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
}
.cutout-row .field { margin: 0; }
.cutout-row .input-group input { font-size: 0.9rem; }

#add-cutout { margin-top: 0.5rem; }

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* Saved Rooms */
.saved-rooms {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.saved-rooms h3 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--color-primary); }
#saved-rooms-list { margin-bottom: 0.75rem; }
.saved-room-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
}
.saved-room-item button { font-size: 0.8rem; padding: 0.2rem 0.5rem; }

/* Results Panel */
.calc-results-panel {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  position: sticky;
  top: 80px;
}
.calc-results-panel h2 { font-size: 1.3rem; margin-bottom: 1.5rem; color: var(--color-primary); }

.results-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: 2rem 0;
}
.results-empty p { font-size: 0.95rem; }

.result-highlight {
  text-align: center;
  padding: 1.5rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}
.result-number { display: block; font-size: 3rem; font-weight: 800; color: var(--color-primary); line-height: 1; }
.result-label { font-size: 0.95rem; color: var(--color-text-muted); }

.result-details { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 1rem; margin-bottom: 1.5rem; }
.result-details dt { font-size: 0.8rem; color: var(--color-text-muted); font-weight: 600; }
.result-details dd { font-size: 0.95rem; font-weight: 600; color: var(--color-text); text-align: right; }

.panel-visual { margin-bottom: 1.5rem; }
.panel-visual h3 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--color-primary); }
.panel-svg-wrap { overflow-x: auto; }
.panel-svg-wrap svg { max-width: 100%; height: auto; }

.result-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Guide Section */
.guide-section { padding: 3rem 0; background: var(--color-surface); border-top: 1px solid var(--color-border); }
.guide-section h2 { font-size: 1.5rem; margin-bottom: 1.5rem; color: var(--color-primary); }
.guide-content { line-height: 1.7; }
.guide-placeholder { color: var(--color-text-muted); font-style: italic; }
.guide-table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.guide-table th, .guide-table td { padding: 0.6rem 0.75rem; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }
.guide-table th { background: var(--color-surface-alt); font-weight: 700; color: var(--color-primary); }
.guide-table tr:nth-child(even) td { background: var(--color-bg); }

/* Reference Section */
.reference-section { padding: 3rem 0; }
.reference-section h2 { font-size: 1.5rem; margin-bottom: 1.5rem; color: var(--color-primary); }
.reference-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-bottom: 2.5rem; }
.ref-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}
.ref-card h3 { font-size: 1rem; color: var(--color-primary); margin-bottom: 0.5rem; }
.ref-card p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

.common-mistakes, .troubleshooting { margin-bottom: 2.5rem; }
.common-mistakes h3, .troubleshooting h3, .preset-examples h3 { font-size: 1.15rem; color: var(--color-primary); margin-bottom: 0.75rem; }
.common-mistakes ul { padding-left: 1.25rem; }
.common-mistakes li { margin-bottom: 0.5rem; font-size: 0.9rem; line-height: 1.6; }
.troubleshooting dl { display: grid; grid-template-columns: auto 1fr; gap: 0.5rem 1.25rem; }
.troubleshooting dt { font-weight: 700; font-size: 0.9rem; color: var(--color-primary); }
.troubleshooting dd { font-size: 0.9rem; color: var(--color-text-muted); }

.preset-examples table { width: 100%; border-collapse: collapse; }
.preset-examples th, .preset-examples td { padding: 0.6rem 0.75rem; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 0.88rem; }
.preset-examples th { background: var(--color-surface-alt); font-weight: 700; color: var(--color-primary); }
.preset-examples tr:hover td { background: var(--color-surface-alt); }

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.8);
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
  font-size: 0.88rem;
}
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 2rem; margin-bottom: 1.5rem; }
.footer-grid strong { display: block; color: #FFF; margin-bottom: 0.5rem; font-size: 0.95rem; }
.footer-grid a { display: block; color: rgba(255,255,255,0.7); margin-bottom: 0.3rem; }
.footer-grid a:hover, .footer-grid a:focus { color: #FFF; }
.footer-note { text-align: center; color: rgba(255,255,255,0.5); font-size: 0.8rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,0.15); }

/* Print Styles */
@media print {
  .site-header, .site-footer, .hero, .form-actions, .result-actions, .saved-rooms, #add-cutout, .btn-remove-cutout { display: none !important; }
  .calc-layout { display: block; }
  .calc-results-panel { position: static; box-shadow: none; border: none; }
  body { background: #FFF; color: #000; }
}

/* Responsive */
@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
  .calc-results-panel { position: static; }
  .field-row { grid-template-columns: 1fr; }
  .cutout-row { grid-template-columns: 1fr 1fr; }
  .cutout-row .field:first-child { grid-column: 1 / -1; }
  .btn-remove-cutout { grid-column: 1 / -1; justify-self: end; }
}

@media (max-width: 600px) {
  .site-header .container { flex-direction: column; height: auto; padding: 0.75rem 1rem; gap: 0.5rem; }
  .site-nav { gap: 1rem; flex-wrap: wrap; justify-content: center; }
  .hero { padding: 2.5rem 0; }
  .hero h1 { font-size: 1.5rem; }
  .calc-form-panel, .calc-results-panel { padding: 1.25rem; }
  .result-details { grid-template-columns: 1fr; }
  .result-details dd { text-align: left; padding-bottom: 0.5rem; border-bottom: 1px solid var(--color-border); }
  .troubleshooting dl { grid-template-columns: 1fr; }
  .preset-examples { overflow-x: auto; }
}

/* Focus styles */
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }

/* Utility */
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }



/* 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;
}