/* tool.css — Shared styles for SinoGrind engineering tools */

:root {
  --tg-primary: #4a6cf7;
  --tg-primary-hover: #3a5ce5;
  --tg-primary-light: #f0f4ff;
  --tg-primary-ring: rgba(74,108,247,0.15);
  --tg-success: #198754;
  --tg-success-hover: #157347;
  --tg-warning: #ffc107;
  --tg-danger: #dc3545;
  --tg-bg: #f8f9fa;
  --tg-card: #ffffff;
  --tg-border: #dee2e6;
  --tg-text: #212529;
  --tg-text-muted: #6c757d;
  --tg-label: #495057;
  --tg-radius: 8px;
  --tg-radius-sm: 6px;
  --tg-radius-lg: 12px;
  --tg-shadow: 0 2px 12px rgba(0,0,0,0.06);
  --tg-shadow-hover: 0 8px 25px rgba(0,0,0,0.12);
  --tg-shadow-lg: 0 4px 20px rgba(0,0,0,0.08);
  --tg-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --tg-transition: all 0.2s ease;
}

/* === Section & Container === */
.tg-section { padding: 40px 0; }
.tg-container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* === Cards === */
.tg-card {
  background: var(--tg-card);
  border-radius: var(--tg-radius);
  box-shadow: var(--tg-shadow);
  padding: 30px;
  margin-bottom: 24px;
  border: 1px solid rgba(0,0,0,0.04);
}
.tg-card-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--tg-border);
}
.tg-card-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--tg-text);
  margin: 0;
}

/* === Form Elements === */
.tg-form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.tg-form-group {
  display: flex;
  flex-direction: column;
}
.tg-form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--tg-label);
  margin-bottom: 6px;
}
.tg-form-group input,
.tg-form-group select,
.tg-form-group textarea {
  padding: 10px 12px;
  border: 1px solid var(--tg-border);
  border-radius: var(--tg-radius-sm);
  font-size: 0.95rem;
  font-family: var(--tg-font);
  color: var(--tg-text);
  background: #fff;
  transition: var(--tg-transition);
  width: 100%;
}
.tg-form-group input:focus,
.tg-form-group select:focus,
.tg-form-group textarea:focus {
  outline: none;
  border-color: var(--tg-primary);
  box-shadow: 0 0 0 3px var(--tg-primary-ring);
}

/* === Radio/Check Card Groups === */
.tg-radio-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tg-radio-card {
  position: relative;
}
.tg-radio-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.tg-radio-card label {
  display: inline-block;
  padding: 8px 16px;
  border: 2px solid var(--tg-border);
  border-radius: var(--tg-radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--tg-transition);
  color: var(--tg-text);
  background: #fff;
}
.tg-radio-card input:checked + label {
  border-color: var(--tg-primary);
  background: var(--tg-primary-light);
  color: var(--tg-primary);
}

/* === Buttons === */
.tg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--tg-radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--tg-font);
  cursor: pointer;
  transition: var(--tg-transition);
  text-decoration: none;
}
.tg-btn:active { transform: scale(0.98); }
.tg-btn-primary {
  background: var(--tg-primary);
  color: #fff;
}
.tg-btn-primary:hover { background: var(--tg-primary-hover); color: #fff; }
.tg-btn-secondary {
  background: #f8f9fa;
  color: var(--tg-text);
  border: 1px solid var(--tg-border);
}
.tg-btn-secondary:hover { background: #e9ecef; }
.tg-btn-success {
  background: var(--tg-success);
  color: #fff;
}
.tg-btn-success:hover { background: var(--tg-success-hover); color: #fff; }
.tg-btn-outline {
  background: transparent;
  color: var(--tg-primary);
  border: 2px solid var(--tg-primary);
}
.tg-btn-outline:hover {
  background: var(--tg-primary);
  color: #fff;
}
.tg-btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}
.tg-btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}
.tg-btn-block {
  display: flex;
  width: 100%;
  max-width: 360px;
  margin: 24px auto 0;
}

/* === Results Panel === */
.tg-results {
  background: var(--tg-bg);
  border-radius: var(--tg-radius);
  padding: 30px;
  margin-top: 24px;
}
.tg-result-card {
  background: var(--tg-card);
  border-radius: var(--tg-radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--tg-shadow);
  border: 1px solid rgba(0,0,0,0.04);
}
.tg-result-card.primary {
  background: linear-gradient(135deg, var(--tg-primary-light) 0%, #fff 100%);
  border: 2px solid var(--tg-primary);
}
.tg-result-card h3 {
  font-size: 0.85rem;
  color: var(--tg-text-muted);
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tg-result-card .value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--tg-primary);
  line-height: 1.2;
}
.tg-result-card .unit {
  font-size: 0.85rem;
  color: var(--tg-text-muted);
  margin-top: 4px;
}
.tg-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

/* === Tables === */
.tg-table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}
.tg-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.tg-table th {
  background: var(--tg-primary);
  color: #fff;
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  font-size: 0.85rem;
}
.tg-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #f0f0f0;
}
.tg-table tr:hover td { background: #f8f9ff; }

/* === Warnings === */
.tg-warning {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--tg-radius-sm);
  padding: 16px 20px;
  margin-top: 16px;
  color: #664d03;
}
.tg-warning h4 { font-size: 0.95rem; margin-bottom: 8px; }
.tg-danger-box {
  background: #fff5f5;
  border: 1px solid #f5c2c7;
  border-radius: var(--tg-radius-sm);
  padding: 16px 20px;
}

/* === Breadcrumb === */
.tg-breadcrumb {
  text-align: center;
  margin-bottom: 20px;
}
.tg-breadcrumb ol {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 0;
  font-size: 14px;
  color: var(--tg-text-muted);
}
.tg-breadcrumb a { color: var(--tg-primary); text-decoration: none; }
.tg-breadcrumb a:hover { text-decoration: underline; }

/* === Tool Header === */
.tg-tool-header {
  text-align: center;
  margin-bottom: 32px;
}
.tg-tool-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--tg-text);
  margin-bottom: 8px;
}
.tg-tool-header .subtitle {
  color: var(--tg-text-muted);
  font-size: 16px;
}

/* === Divider === */
.tg-divider {
  font-size: 16px;
  font-weight: 600;
  color: var(--tg-text);
  margin: 28px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--tg-border);
}

/* === Tags === */
.tg-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tg-tag {
  background: var(--tg-primary-light);
  color: var(--tg-primary);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 500;
}

/* === Toast === */
.tg-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #333;
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--tg-radius-sm);
  font-size: 14px;
  z-index: 9999;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
}
.tg-toast.show { opacity: 1; transform: translateY(0); }

/* === About Box === */
.tg-about-box {
  margin-top: 24px;
  padding: 20px;
  background: var(--tg-bg);
  border-radius: var(--tg-radius);
}
.tg-about-box h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--tg-text);
}
.tg-about-box p {
  color: #555;
  line-height: 1.7;
}
.tg-about-box .tg-disclaimer {
  color: var(--tg-text-muted);
  font-size: 13px;
  margin-top: 12px;
}

/* === Responsive === */
@media (max-width: 768px) {
  .tg-form-grid { grid-template-columns: 1fr; }
  .tg-results-grid { grid-template-columns: 1fr 1fr; }
  .tg-card { padding: 20px; }
  .tg-results { padding: 20px; }
  .tg-tool-header h1 { font-size: 22px; }
}
@media (max-width: 480px) {
  .tg-results-grid { grid-template-columns: 1fr; }
}