/* =========================================================================
   Smart Calculators — Shared site-wide styles
   Used by: index.html and every tool page in /tools/
   ========================================================================= */

:root {
  --primary-color: #007bff;
  --secondary-color: #0056b3;
  --background-color: #f4f7f6;
  --card-bg-color: #ffffff;
  --text-color: #333;
  --text-light-color: #6c757d;
  --border-color: #e0e0e0;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --box-shadow-dark: 0 8px 30px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --input-border-color: #ced4da;
  --focus-glow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary-color); }

/* ---------- Site header (shared on every page) ---------- */
.site-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: var(--box-shadow);
}
.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: white;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.site-brand i { font-size: 1.6rem; }
.site-nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-nav a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}
.site-nav a:hover { color: white; text-decoration: underline; }

/* ---------- Hero (homepage only) ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 3rem 1.25rem 4rem;
  text-align: center;
}
.hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.15);
}
.hero .subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-top: 0.5rem;
}

/* ---------- Breadcrumb (tool pages) ---------- */
.breadcrumb {
  background-color: #fff;
  border-bottom: 1px solid var(--border-color);
}
.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text-light-color);
}
.breadcrumb-inner a { color: var(--text-light-color); text-decoration: none; }
.breadcrumb-inner a:hover { color: var(--primary-color); }
.breadcrumb-inner .separator { margin: 0 0.5rem; opacity: 0.6; }
.breadcrumb-inner .current { color: var(--text-color); font-weight: 500; }

/* ---------- Main layout ---------- */
main {
  flex: 1;
  padding: 2rem 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* ---------- Calculator grid (homepage) ---------- */
.button-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}
.tool-button {
  background-color: var(--card-bg-color);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.75rem 1rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.tool-button i {
  font-size: 2.25rem;
  margin-bottom: 0.85rem;
  color: var(--primary-color);
  transition: all 0.3s ease;
}
.tool-button:hover, .tool-button:focus {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  transform: translateY(-6px);
  box-shadow: 0 12px 25px rgba(0, 123, 255, 0.25);
  border-color: var(--primary-color);
  outline: none;
}
.tool-button:hover i, .tool-button:focus i { color: white; transform: scale(1.05); }

/* "NEW" banner on tool buttons */
.hot-banner {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: #e74c3c;
  color: white;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%   { transform: scale(1);    box-shadow: 0 0 0 0   rgba(231, 76, 60, 0.7); }
  70%  { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(231, 76, 60, 0);  }
  100% { transform: scale(1);    box-shadow: 0 0 0 0   rgba(231, 76, 60, 0);  }
}

/* ---------- Tool page container ---------- */
#tool-container {
  background-color: var(--card-bg-color);
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  border: 1px solid var(--border-color);
}

.tool-content { max-width: 600px; margin: auto; text-align: center; }
.tool-content h1, .tool-content h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-weight: 700;
}
.tool-content .tool-description {
  color: var(--text-light-color);
  margin-bottom: 1.75rem;
  font-size: 1rem;
}
.tool-content .input-group { margin-bottom: 1.25rem; text-align: left; }
.tool-content label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-color);
}
.tool-content .tool-input,
.tool-content select {
  width: 100%;
  padding: 0.75rem 0.875rem;
  border: 2px solid var(--input-border-color);
  border-radius: 8px;
  font-size: 1rem;
  background-color: #fff;
  color: var(--text-color);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.tool-content .tool-input:focus,
.tool-content select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: var(--focus-glow);
}
.tool-content .tool-action-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 0.875rem 2rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.2);
}
.tool-content .tool-action-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0, 123, 255, 0.3);
}
.tool-content .tool-result {
  margin-top: 1.75rem;
  padding: 1.25rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--background-color);
  min-height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-color);
}

/* SEO content section under each calculator */
.tool-content-plus {
  margin-top: 3rem;
  max-width: 100%;
  text-align: left;
}
.tool-content-plus h3 {
  color: var(--primary-color);
  margin: 2rem 0 0.75rem;
  font-size: 1.4rem;
}
.tool-content-plus h3:first-child { margin-top: 0; }
.tool-content-plus h4 { margin: 1.5rem 0 0.5rem; font-size: 1.1rem; color: var(--text-color); }
.tool-content-plus p, .tool-content-plus ul, .tool-content-plus ol { margin-bottom: 1rem; }
.tool-content-plus ul, .tool-content-plus ol { padding-left: 1.5rem; }
.tool-content-plus li { margin-bottom: 0.4rem; }

/* ---------- Related tools strip (tool pages) ---------- */
.related-tools {
  margin-top: 2.5rem;
  background-color: var(--card-bg-color);
  border-radius: var(--border-radius);
  padding: 2rem 1.5rem;
  border: 1px solid var(--border-color);
}
.related-tools h3 {
  text-align: center;
  margin-bottom: 1.25rem;
  color: var(--primary-color);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
}
.related-grid a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.92rem;
  transition: all 0.2s ease;
  background-color: #fff;
}
.related-grid a:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 123, 255, 0.1);
}
.related-grid a i { color: var(--primary-color); }

/* ---------- Footer ---------- */
.site-footer {
  background: linear-gradient(135deg, #2c3e50, #34495e);
  color: white;
  padding: 3rem 1.25rem 2rem;
  margin-top: auto;
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--primary-color));
}
.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-section h3 {
  color: var(--primary-color);
  margin-bottom: 0.85rem;
  font-size: 1.15rem;
}
.footer-section p, .footer-section ul {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.93rem;
}
.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: 0.4rem; }
.footer-section ul li a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-section ul li a:hover { color: var(--primary-color); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.88rem;
}
.social-links { margin-top: 0.75rem; }
.social-links a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.25rem;
  margin-right: 0.6rem;
  transition: color 0.2s ease;
}
.social-links a:hover { color: var(--primary-color); }

/* ---------- Modal (used on homepage for About/Privacy/Terms/Contact) ---------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-overlay.show { display: flex; }
.modal-content {
  background: white;
  border-radius: 14px;
  max-width: 720px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
.modal-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h2 { font-size: 1.3rem; margin: 0; }
.modal-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.8rem;
  cursor: pointer;
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background-color 0.2s ease;
}
.modal-close:hover { background-color: rgba(255, 255, 255, 0.2); }
.modal-body {
  padding: 1.5rem 1.75rem;
  overflow-y: auto;
  max-height: calc(85vh - 80px);
  line-height: 1.65;
}
.modal-body h3 { color: var(--primary-color); margin: 1.5rem 0 0.6rem; }
.modal-body h3:first-child { margin-top: 0; }
.modal-body p { margin-bottom: 0.85rem; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .button-container { grid-template-columns: 1fr 1fr; gap: 0.85rem; }
  .hero h1 { font-size: 2rem; }
  .hero { padding: 2.25rem 1rem 3rem; }
  .tool-button { padding: 1.4rem 0.6rem; }
  .tool-button i { font-size: 1.85rem; }
  #tool-container { padding: 1.5rem; }
  .footer-content { grid-template-columns: 1fr; text-align: center; }
  .site-header-inner { padding: 0.85rem 1rem; }
  .site-brand { font-size: 1.2rem; }
}
@media (max-width: 480px) {
  .button-container { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.7rem; }
}