/* Reset e stile di base condiviso da tutti i tool.
   Identita visiva originale: palette teal/slate, nessuna somiglianza con Omni Calculator (blu). */

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

:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #1c1917;
  --color-text-muted: #57534e;
  --color-accent: #0d9488;
  --color-accent-hover: #0f766e;
  --color-accent-contrast: #ffffff;
  --color-border: #e7e5e4;
  --color-result-bg: #f0fdfa;
  --color-result-border: #99f6e4;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 10px;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
}

a {
  color: var(--color-accent-hover);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header__inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo span {
  color: var(--color-accent);
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 1.25rem;
}

.site-nav a:hover {
  color: var(--color-accent-hover);
}

/* Main content */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-accent-hover);
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.tool-subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin: 0 0 1.75rem;
}

h2 {
  font-size: 1.3rem;
  margin: 2rem 0 0.75rem;
}

.tool-content p {
  margin: 0 0 1rem;
}

.tool-content ul, .tool-content ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

/* Calculator card */
.calculator-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.form-field {
  flex: 1 1 160px;
  display: flex;
  flex-direction: column;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.form-field input,
.form-field select {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
}

.form-field input:focus,
.form-field select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.calculate-btn {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  border: none;
  border-radius: 6px;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.calculate-btn:hover {
  background: var(--color-accent-hover);
}

.result-box {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-result-bg);
  border: 1px solid var(--color-result-border);
  border-radius: var(--radius);
  display: none;
}

.result-box.is-visible {
  display: block;
}

.result-box .result-main {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent-hover);
  margin: 0 0 0.5rem;
}

.result-box .result-detail {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.breakdown-table th,
.breakdown-table td {
  text-align: left;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.error-text {
  color: #b91c1c;
  font-size: 0.9rem;
  margin-top: 0.5rem;
  display: none;
}

.error-text.is-visible {
  display: block;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.site-footer__inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-footer a {
  color: var(--color-text-muted);
}

.site-footer a:hover {
  color: var(--color-accent-hover);
}

/* Home hero */
.home-hero {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
}

.home-hero h1 {
  font-size: 2.1rem;
  margin: 0 0 0.6rem;
}

.home-hero p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* Category / tool card grids (home + category pages) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.card-grid a {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-decoration: none;
  color: var(--color-text);
  display: block;
  transition: border-color 0.15s;
}

.card-grid a:hover {
  border-color: var(--color-accent);
}

.card-grid h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  color: var(--color-text);
}

.card-grid p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.card-grid .card-meta {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--color-accent-hover);
  font-weight: 600;
}

@media (max-width: 480px) {
  .form-row {
    flex-direction: column;
  }
}