/* WrapCalc — Gift Wrapping Paper Calculator Styles */
:root {
  --c-bg: #fdf8f0;
  --c-surface: #ffffff;
  --c-surface-alt: #f5ede2;
  --c-primary: #8b2252;
  --c-primary-light: #a83279;
  --c-primary-dark: #6b1a3f;
  --c-accent: #2e7d5e;
  --c-accent-light: #3da87e;
  --c-text: #2d2a26;
  --c-text-muted: #6b6560;
  --c-text-light: #9a948e;
  --c-border: #e0d6ca;
  --c-border-light: #ede5da;
  --c-error: #c0392b;
  --c-success: #27ae60;
  --c-focus: #8b2252;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --max-width: 1120px;
  --transition: 0.2s ease;
}

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

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

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

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

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* Header */
.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--c-primary);
  text-decoration: none;
  flex-shrink: 0;
}
.logo:hover, .logo:focus-visible { color: var(--c-primary-dark); text-decoration: none; }
.logo svg { color: var(--c-primary); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-text-muted);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.site-nav a:hover, .site-nav a:focus-visible {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
  text-decoration: none;
}
.site-nav .ecolink {
  color: var(--c-accent);
  border-bottom-color: transparent;
}
.site-nav .ecolink:hover { color: var(--c-accent-light); border-bottom-color: var(--c-accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Hero / Calculator Section */
.hero {
  padding: 3rem 0 4rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.hero-text h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-primary-dark);
  margin-bottom: 1rem;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--c-text-muted);
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.presets-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}
.presets-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-text-muted);
  margin-right: 0.25rem;
}
.preset-btn {
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--c-border);
  border-radius: 20px;
  background: var(--c-surface);
  color: var(--c-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.preset-btn:hover, .preset-btn:focus-visible {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
}

/* Calculator Panel */
.calc-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.unit-row {
  margin-bottom: 1.25rem;
}
.unit-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--c-text-muted);
}
.unit-row select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font);
  cursor: pointer;
}

.dims-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--c-text-muted);
}
.field input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(139,34,82,0.15);
}
.field input::placeholder { color: var(--c-text-light); }
.field-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-light);
  margin-top: 0.25rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: var(--c-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  font-family: var(--font);
}
.btn-primary:hover, .btn-primary:focus-visible {
  background: var(--c-primary-dark);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--c-surface-alt);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.btn-secondary:hover, .btn-secondary:focus-visible {
  background: var(--c-border-light);
  border-color: var(--c-text-light);
}

.btn-text-danger {
  background: none;
  border: none;
  color: var(--c-error);
  font-size: 0.85rem;
  cursor: pointer;
  font-family: var(--font);
  padding: 0.5rem 0;
  text-decoration: underline;
}
.btn-text-danger:hover { color: #a03025; }

/* Results */
.results-area { margin-top: 1.5rem; }
.results-area h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--c-primary-dark);
}

.method-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.25rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.tab-btn {
  flex: 1;
  padding: 0.6rem;
  background: var(--c-surface-alt);
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.tab-btn:not(:last-child) { border-right: 1px solid var(--c-border); }
.tab-btn.active {
  background: var(--c-primary);
  color: #fff;
}
.tab-btn:focus-visible { outline: 2px solid var(--c-focus); outline-offset: -2px; }

.tab-panel { animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.result-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.result-card {
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  text-align: center;
}
.result-card.highlight {
  background: #fef3e2;
  border-color: #e8c87a;
}
.rc-label {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-muted);
  margin-bottom: 0.25rem;
}
.rc-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-text);
}

.diagram-wrap {
  margin-bottom: 1.25rem;
}
.diagram-wrap h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.diagram {
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}
.diagram svg { max-width: 100%; height: auto; }
.diagram-caption {
  font-size: 0.8rem;
  color: var(--c-text-muted);
  margin-top: 0.5rem;
}

.savings-callout {
  background: #e8f8f0;
  border: 1px solid #a3d9c5;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--c-accent);
}

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

.empty-state {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--c-text-light);
}
.empty-state svg { margin-bottom: 0.75rem; opacity: 0.5; }

/* Methods Section */
.methods-section {
  padding: 4rem 0;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}
.methods-section h2,
.history-section h2,
.tips-section h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--c-primary-dark);
  margin-bottom: 0.5rem;
}
.section-intro {
  color: var(--c-text-muted);
  margin-bottom: 2rem;
  max-width: 600px;
}
.method-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.method-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.method-icon {
  color: var(--c-primary);
  margin-bottom: 0.75rem;
}
.method-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--c-text);
}
.method-card p {
  color: var(--c-text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}
.method-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--c-text-muted);
}
.method-list li {
  padding: 0.25rem 0;
  padding-left: 1.25rem;
  position: relative;
}
.method-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--c-accent);
  font-weight: 700;
}

/* History Section */
.history-section {
  padding: 4rem 0;
  border-top: 1px solid var(--c-border);
}
.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.history-empty {
  color: var(--c-text-light);
  font-style: italic;
  padding: 1rem 0;
}
.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  gap: 1rem;
  cursor: pointer;
  transition: all var(--transition);
}
.history-item:hover, .history-item:focus-visible {
  border-color: var(--c-primary);
  box-shadow: var(--shadow);
}
.history-item .hi-dims {
  font-weight: 600;
  font-size: 0.9rem;
}
.history-item .hi-result {
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.history-item .hi-date {
  font-size: 0.75rem;
  color: var(--c-text-light);
  white-space: nowrap;
}
.history-item .hi-delete {
  background: none;
  border: none;
  color: var(--c-text-light);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.25rem;
  line-height: 1;
  transition: color var(--transition);
}
.history-item .hi-delete:hover { color: var(--c-error); }

/* Tips Section */
.tips-section {
  padding: 4rem 0;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}
.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.tip-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.tip-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--c-primary-dark);
}
.tip-card p {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  line-height: 1.55;
}

.assumptions-block {
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.assumptions-block h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--c-text);
}
.assumptions-block ul {
  list-style: none;
  font-size: 0.9rem;
  color: var(--c-text-muted);
  margin-bottom: 1rem;
}
.assumptions-block ul li {
  padding: 0.2rem 0;
  padding-left: 1.25rem;
  position: relative;
}
.assumptions-block ul li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--c-primary);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1;
}
.last-updated {
  font-size: 0.8rem;
  color: var(--c-text-light);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 2rem 0;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer-grid strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--c-text);
}
.footer-grid p {
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-shrink: 0;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.footer-links a:hover { color: var(--c-primary); }

/* Focus styles */
*:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Print */
@media print {
  .site-header, .site-footer, .presets-bar, .result-actions, .nav-toggle, .history-section, .tips-section, .methods-section { display: none !important; }
  .hero { padding: 0; }
  .hero-grid { grid-template-columns: 1fr; }
  .calc-panel { box-shadow: none; border: 1px solid #ccc; }
  .diagram { border: 1px solid #ccc; }
  body { background: #fff; }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero-text h1 { font-size: 2rem; }
  .result-cards { grid-template-columns: repeat(2, 1fr); }
  .tips-grid { grid-template-columns: repeat(2, 1fr); }
  .method-cards { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-nav { display: none; }
  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    padding: 1rem 1.5rem;
    gap: 0.75rem;
    box-shadow: var(--shadow);
  }
  .nav-toggle { display: flex; }
  .dims-grid { grid-template-columns: 1fr; }
  .result-cards { grid-template-columns: 1fr 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 1.65rem; }
  .calc-panel { padding: 1.25rem; }
  .footer-grid { flex-direction: column; gap: 1rem; }
}

@media (max-width: 400px) {
  .result-cards { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; }
  .result-actions .btn-secondary { width: 100%; justify-content: center; }
}



/* 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;
}