/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #faf8f5;
  --color-surface: #ffffff;
  --color-surface-alt: #f3ede5;
  --color-border: #d6cfc5;
  --color-text: #2c2418;
  --color-text-muted: #6b5e4e;
  --color-primary: #8B5E3C;
  --color-primary-hover: #6e4830;
  --color-primary-light: #f5ebe0;
  --color-accent: #D9A44A;
  --color-accent-hover: #c4923e;
  --color-danger: #c0392b;
  --color-danger-hover: #a93226;
  --color-success: #2d8a4e;
  --color-warning: #d4a017;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --max-width: 1120px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  z-index: 100;
}
.skip-link:focus { top: 1rem; }

/* ===== Header ===== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}
.site-nav a:hover { color: var(--color-primary); text-decoration: none; }

/* ===== Hero ===== */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}
.btn:hover { text-decoration: none; }

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

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-ghost:hover { background: var(--color-primary-light); }

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}
.btn-danger:hover { background: var(--color-danger-hover); border-color: var(--color-danger-hover); }

/* ===== Sections ===== */
section { padding: 3.5rem 0; }

.section-header {
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 640px;
}

/* ===== Calculator ===== */
.calculator-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 860px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.machine-select legend {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.machine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
}

.machine-card {
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-bg);
  user-select: none;
}

.machine-card:hover {
  border-color: var(--color-primary);
}

.machine-card input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.machine-card:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.machine-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.machine-cfm {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-group label {
  font-weight: 600;
  font-size: 0.9rem;
}

.input-group input,
.input-group select {
  padding: 0.55rem 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 94, 60, 0.15);
}

.help {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ===== Results ===== */
.calc-results {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: sticky;
  top: 80px;
}

.calc-results h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.result-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-align: center;
}

.result-card.highlight {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  grid-column: 1 / -1;
}

.result-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
}

.result-unit {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.result-notes {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  min-height: 1.5em;
}

.result-flags {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.flag {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.82rem;
  line-height: 1.4;
}

.flag-warn {
  background: #fef9e7;
  border: 1px solid #f0d78c;
  color: #7d6608;
}

.flag-info {
  background: #eaf4fe;
  border: 1px solid #a8d0f0;
  color: #1a5276;
}

.flag-ok {
  background: #e9f7ef;
  border: 1px solid #a9dfbf;
  color: #1e8449;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.saved-layouts h4 {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.saved-layouts ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.layout-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.82rem;
}

.layout-item button {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.layout-item button:hover {
  background: var(--color-primary-light);
}

/* ===== Scenarios ===== */
.scenarios-section {
  background: var(--color-bg);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.scenario-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.scenario-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
  font-size: 0.88rem;
  margin-bottom: 0.75rem;
}

.scenario-card dt {
  font-weight: 600;
  color: var(--color-text-muted);
}

.scenario-card dd {
  color: var(--color-text);
}

.scenario-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

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

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.ref-block {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.ref-block h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.ref-block p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

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

.ref-table-wrap h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.ref-table th,
.ref-table td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.ref-table th {
  background: var(--color-surface-alt);
  font-weight: 600;
  white-space: nowrap;
}

.ref-table tr:last-child td {
  border-bottom: none;
}

/* ===== About Section ===== */
.about-section {
  background: var(--color-bg);
}

.about-section p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
  max-width: 700px;
}

.last-updated {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 1.5rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-grid strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.footer-grid p,
.footer-grid a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-grid ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .header-inner { height: auto; flex-direction: column; padding: 0.75rem 0; gap: 0.5rem; }
  .site-nav ul { gap: 1rem; flex-wrap: wrap; justify-content: center; }
  .hero { padding: 2.5rem 0 2rem; }
  .result-cards { grid-template-columns: 1fr; }
  .result-card.highlight { grid-column: auto; }
  .machine-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
}

@media print {
  .site-header, .site-footer, .hero, .scenarios-section, .about-section, .result-actions, .saved-layouts { display: none; }
  .calc-results { position: static; border: none; padding: 0; }
  body { background: #fff; color: #000; }
}



/* 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;
}