/* Stair Climb Haul Planner - Styles */

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-success: #16a34a;
  --color-success-bg: #f0fdf4;
  --color-success-border: #bbf7d0;
  --color-warn: #d97706;
  --color-warn-bg: #fffbeb;
  --color-warn-border: #fde68a;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;
  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --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, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 60px;
}

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

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

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 {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
}

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  flex-shrink: 0;
}

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

.main-nav a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

/* Hero */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: #fff;
  padding: 48px 0 40px;
}

.hero-section h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 8px;
}

.hero-sub {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 560px;
}

/* Planner Section */
.planner-section {
  padding: 40px 0;
}

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

/* Input Panel */
.input-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.input-panel h2 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary-light);
}

.input-group {
  border: none;
  padding: 0;
  margin: 0 0 20px;
}

.input-group legend {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  padding: 0;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.field {
  margin-bottom: 4px;
}

.field label {
  display: block;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 4px;
  color: var(--color-text);
}

.field input,
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input-with-unit {
  display: flex;
  gap: 8px;
}

.input-with-unit input {
  flex: 1;
  min-width: 0;
}

.input-with-unit select,
.unit-label {
  flex-shrink: 0;
  width: 80px;
  padding: 10px 8px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.unit-label {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 500;
}

.hint {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Presets */
.presets {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.presets h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-btn {
  padding: 8px 14px;
  border: 1px solid var(--color-border-strong);
  border-radius: 20px;
  background: var(--color-bg);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
  color: var(--color-text);
}

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

.preset-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Action Buttons */
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.btn-secondary {
  background: var(--color-bg);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

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

/* Results Panel */
.results-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.results-panel h2 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary-light);
}

/* Verdict */
.verdict {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  transition: all 0.3s;
}

.verdict.go {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
}

.verdict.caution {
  background: var(--color-warn-bg);
  border-color: var(--color-warn-border);
}

.verdict.no-go {
  background: var(--color-danger-bg);
  border-color: var(--color-danger-border);
}

.verdict-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.verdict.go .verdict-icon {
  background: var(--color-success);
  color: #fff;
}

.verdict.go .verdict-icon::after {
  content: "✓";
}

.verdict.caution .verdict-icon {
  background: var(--color-warn);
  color: #fff;
}

.verdict.caution .verdict-icon::after {
  content: "!";
}

.verdict.no-go .verdict-icon {
  background: var(--color-danger);
  color: #fff;
}

.verdict.no-go .verdict-icon::after {
  content: "✕";
}

.verdict-label {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
}

.verdict.go .verdict-label {
  color: var(--color-success);
}

.verdict.caution .verdict-label {
  color: var(--color-warn);
}

.verdict.no-go .verdict-label {
  color: var(--color-danger);
}

.verdict-detail {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* Result Cards */
.result-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.result-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.result-card h3 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.result-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
}

.result-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Visualizer */
.visualizer {
  margin-bottom: 24px;
}

.visualizer h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.corner-svg {
  width: 100%;
  max-width: 300px;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

/* Weight Guide */
.weight-guide {
  margin-bottom: 24px;
  padding: 16px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.weight-guide h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.weight-guide p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Tight Spots */
.tight-spots {
  margin-bottom: 24px;
}

.tight-spots h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.tight-spots ul {
  list-style: none;
  padding: 0;
}

.tight-spots li {
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-border-strong);
  margin-bottom: 6px;
  background: var(--color-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.tight-spots li.problem {
  border-left-color: var(--color-danger);
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.tight-spots li.warning {
  border-left-color: var(--color-warn);
  background: var(--color-warn-bg);
  color: var(--color-warn);
}

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

.guide-section h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.guide-card {
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.guide-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary-dark);
}

.guide-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Mistakes Section */
.mistakes-section {
  padding: 48px 0;
}

.mistakes-section h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.mistakes-list details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
}

.mistakes-list summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--color-text);
  transition: background 0.15s;
}

.mistakes-list summary:hover {
  background: var(--color-bg);
}

.mistakes-list details[open] summary {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.mistakes-list details p {
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Edge Cases Section */
.edge-cases-section {
  padding: 48px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.edge-cases-section h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.edge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.edge-card {
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.edge-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary-dark);
}

.edge-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* FAQ Section */
.faq-section {
  padding: 48px 0;
}

.faq-section h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.faq-list dt {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
  margin-top: 20px;
  color: var(--color-text);
}

.faq-list dd {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-left: 0;
  padding-left: 16px;
  border-left: 3px solid var(--color-primary-light);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer-inner {
  text-align: center;
}

.footer-note {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.footer-nav ul {
  display: flex;
  justify-content: center;
  gap: 20px;
  list-style: none;
  margin-bottom: 12px;
}

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

.footer-nav a:hover {
  color: var(--color-primary);
}

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

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--color-text);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: toast-in 0.3s ease;
}

.toast.hide {
  animation: toast-out 0.3s ease forwards;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toast-out {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(10px); }
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .action-row,
  .presets,
  .skip-link {
    display: none !important;
  }
  .planner-grid {
    grid-template-columns: 1fr;
  }
  .results-panel {
    position: static;
  }
  body {
    background: #fff;
  }
  .input-panel,
  .results-panel {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .planner-grid {
    grid-template-columns: 1fr;
  }
  .results-panel {
    position: static;
  }
  .guide-grid,
  .edge-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero-section {
    padding: 32px 0 28px;
  }
  .hero-section h1 {
    font-size: 1.6rem;
  }
  .hero-sub {
    font-size: 1rem;
  }
  .field-row {
    grid-template-columns: 1fr;
  }
  .result-cards {
    grid-template-columns: 1fr;
  }
  .input-panel,
  .results-panel {
    padding: 20px;
  }
  .main-nav ul {
    gap: 16px;
  }
  .main-nav a {
    font-size: 0.85rem;
  }
  .logo-text {
    font-size: 0.95rem;
  }
  .action-row {
    flex-direction: column;
  }
  .action-row .btn {
    width: 100%;
    text-align: center;
  }
}

/* Focus visible for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}


/* 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;
}