/* ============================================
   INVOICEFORGE — SHARED STYLES
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --danger: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
}

/* NAV */
.nav {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-left { display: flex; align-items: center; gap: 32px; }
.logo { font-size: 20px; font-weight: 800; color: var(--primary); text-decoration: none; }
.logo span { color: var(--gray-800); }
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: all 0.15s;
}
.nav-links a:hover { background: var(--gray-100); color: var(--gray-800); }
.nav-links a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.nav-badge {
  background: var(--success);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav { padding: 10px 16px; }
}

/* HERO */
.hero {
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  color: white;
  text-align: center;
  padding: 40px 24px 36px;
}
.hero h1 { font-size: 28px; font-weight: 800; margin-bottom: 6px; letter-spacing: -0.5px; }
.hero p { font-size: 15px; opacity: 0.85; max-width: 500px; margin: 0 auto; }

/* PANELS */
.panel {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 16px;
}
.panel-header {
  padding: 14px 20px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-600);
}
.panel-body { padding: 20px; }

/* FORMS */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.form-row.full { grid-template-columns: 1fr; }
.form-row.three { grid-template-columns: 1fr 1fr 1fr; }

label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

input, textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  color: var(--gray-800);
  transition: border-color 0.2s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #15803d; }
.btn-outline { background: white; color: var(--gray-600); border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-50); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-group { display: flex; gap: 8px; margin-top: 16px; }

/* CALCULATOR SPECIFIC */
.calc-container {
  max-width: 600px;
  margin: 32px auto;
  padding: 0 24px;
}
.calc-result {
  text-align: center;
  padding: 24px;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  border-radius: var(--radius);
  color: white;
  margin-top: 20px;
}
.calc-result-label { font-size: 13px; opacity: 0.8; text-transform: uppercase; letter-spacing: 0.5px; }
.calc-result-value { font-size: 36px; font-weight: 800; margin-top: 4px; }
.calc-result-sub { font-size: 14px; opacity: 0.7; margin-top: 8px; }

.calc-breakdown {
  margin-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.calc-breakdown-item { text-align: center; }
.calc-breakdown-label { font-size: 11px; opacity: 0.7; text-transform: uppercase; }
.calc-breakdown-value { font-size: 20px; font-weight: 700; }

/* HOMEPAGE */
.tools-grid {
  max-width: 1000px;
  margin: 32px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.tool-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  border: 1px solid var(--gray-200);
}
.tool-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--primary);
}
.tool-card-icon { font-size: 32px; margin-bottom: 12px; }
.tool-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; color: var(--gray-800); }
.tool-card p { font-size: 13px; color: var(--gray-500); line-height: 1.5; }
.tool-card-badge {
  display: inline-block;
  margin-top: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

/* FOOTER */
.site-footer {
  text-align: center;
  padding: 32px;
  color: var(--gray-400);
  font-size: 12px;
  margin-top: 40px;
  border-top: 1px solid var(--gray-200);
}
.site-footer a { color: var(--primary); text-decoration: none; }

/* SEO CONTENT */
.seo-section {
  max-width: 700px;
  margin: 40px auto;
  padding: 0 24px;
}
.seo-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--gray-800);
}
.seo-section p {
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 12px;
  line-height: 1.7;
}
.seo-section ul {
  margin: 8px 0 16px 20px;
  color: var(--gray-600);
  font-size: 14px;
}
.seo-section li { margin-bottom: 4px; }
</style>