/* ============================================
   Business Tools Network — Shared Styles
   Design: Clean utility. No decorative bloat.
   Goal: Fast load, high readability, mobile-first.
   ============================================ */

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #555;
  --color-primary: #0f5132;
  --color-primary-light: #e8f5e9;
  --color-accent: #1565c0;
  --color-border: #e0e0e0;
  --color-input-bg: #f5f5f5;
  --color-result-bg: #0f5132;
  --color-result-text: #ffffff;
  --color-cta: #e65100;
  --font-body: 'Libre Franklin', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 720px;
  --radius: 6px;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* === LAYOUT === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* === NAV === */
.site-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-nav__logo {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
}
.site-nav__links { display: flex; gap: 18px; }
.site-nav__links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
}
.site-nav__links a:hover { color: var(--color-primary); }

/* === PAGE HEADER === */
.page-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}
.page-header h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: 10px;
}
.page-header p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  max-width: 600px;
}

/* === TOOL CARD === */
.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 32px;
}

/* === FORM ELEMENTS === */
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group small {
  display: block;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin-top: 3px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 500px) {
  .form-row { grid-template-columns: 1fr; }
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-body);
  background: var(--color-input-bg);
  color: var(--color-text);
  transition: border-color 0.2s;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
  transition: transform 0.1s, opacity 0.2s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { opacity: 0.9; }
.btn-reset {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  margin-left: 10px;
}

/* === RESULTS === */
.results {
  background: var(--color-result-bg);
  color: var(--color-result-text);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-top: 24px;
  display: none;
}
.results.visible { display: block; }
.results h3 {
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
  margin-bottom: 12px;
}
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.15);
}
.result-row:last-child { border-bottom: none; }
.result-label {
  font-size: 0.9rem;
  opacity: 0.85;
}
.result-value {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
}
.result-value.large {
  font-size: 1.6rem;
}

/* === AD SLOTS === */
.ad-slot {
  background: var(--color-input-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  margin: 24px 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* === CONTENT SECTIONS === */
.content-section {
  margin-bottom: 36px;
}
.content-section h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 14px;
  color: var(--color-text);
}
.content-section p {
  margin-bottom: 12px;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* === CTA BOX (Affiliate) === */
.cta-box {
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-left: 4px solid var(--color-cta);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 28px 0;
}
.cta-box h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.cta-box p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}
.cta-box a.cta-link {
  display: inline-block;
  background: var(--color-cta);
  color: #fff;
  padding: 8px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
}
.cta-box a.cta-link:hover { opacity: 0.9; }

/* === FAQ === */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-question {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 6px;
  cursor: pointer;
}
.faq-answer {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* === RELATED TOOLS === */
.related-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.related-tool-link {
  display: block;
  padding: 14px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.88rem;
  transition: border-color 0.2s;
}
.related-tool-link:hover {
  border-color: var(--color-primary);
}
.related-tool-link small {
  display: block;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-top: 4px;
}

/* === FOOTER === */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 0;
  margin-top: 48px;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}
.site-footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}
.footer-links {
  display: flex;
  gap: 18px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.affiliate-disclosure {
  font-size: 0.75rem;
  font-style: italic;
  margin-top: 8px;
  opacity: 0.7;
}

/* === UTILITY === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}