/* === 张家口旅游工具箱 — 全局样式 === */
:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #ccfbf1;
  --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;
  --amber-50: #fffbeb;
  --amber-500: #f59e0b;
  --red-500: #ef4444;
  --green-500: #10b981;
  --blue-500: #3b82f6;
  --purple-500: #8b5cf6;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.7;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.1);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { font-size: 1.2rem; font-weight: 700; color: #fff; text-decoration: none; }
.logo:hover { opacity: .85; }
.site-header nav { display: flex; gap: 16px; }
.nav-link { color: rgba(255,255,255,.85); font-size: .875rem; text-decoration: none; }
.nav-link:hover { color: #fff; }

/* Hero */
.hero {
  padding: 60px 0 40px;
  text-align: center;
  background: linear-gradient(135deg, #f0fdfa, #ccfbf1);
}
.hero h1 { font-size: 2.5rem; font-weight: 800; color: var(--gray-900); margin-bottom: 12px; }
.hero-subtitle { font-size: 1.15rem; color: var(--gray-600); max-width: 700px; margin: 0 auto 16px; }
.hero-desc { font-size: .95rem; color: var(--gray-500); max-width: 800px; margin: 0 auto; line-height: 1.8; }

/* Section titles */
.section-title { font-size: 1.5rem; font-weight: 700; color: var(--gray-900); margin-bottom: 12px; }
.section-subtitle { color: var(--gray-500); margin-bottom: 32px; font-size: .95rem; }
.tool-description { font-size: .95rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 24px; }

/* Tool Cards Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  padding: 40px 0;
}
.tool-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 28px;
  transition: all .2s;
}
.tool-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(13,148,136,.12);
  transform: translateY(-2px);
}
.tool-icon { font-size: 2rem; display: block; margin-bottom: 12px; }
.tool-card h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.tool-card h2 a { color: var(--gray-900); text-decoration: none; }
.tool-card h2 a:hover { color: var(--primary); }
.tool-card p { font-size: .9rem; color: var(--gray-600); line-height: 1.7; margin-bottom: 12px; }
.tool-stat { font-size: .8rem; color: var(--gray-400); margin-bottom: 16px; }
.tool-cta {
  display: inline-block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}
.tool-cta:hover { color: var(--primary-dark); }

/* Tool Page Layout */
.tool-page { padding: 40px 0 60px; }
.tool-header { margin-bottom: 40px; }
.tool-header h1 { font-size: 2rem; font-weight: 800; color: var(--gray-900); margin-bottom: 8px; }
.tool-header .breadcrumb { font-size: .85rem; color: var(--gray-400); margin-bottom: 16px; }
.tool-header .breadcrumb a { color: var(--primary); text-decoration: none; }
.tool-header .breadcrumb a:hover { text-decoration: underline; }

/* Tool Interface */
.tool-interface {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 40px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: .9rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.form-group select, .form-group input, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: .95rem;
  color: var(--gray-800);
  background: #fff;
  transition: border .2s;
}
.form-group select:focus, .form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 10px; }
.checkbox-group label {
  display: flex; align-items: center; gap: 6px;
  font-size: .9rem; font-weight: 400; cursor: pointer;
}
.checkbox-group input[type="checkbox"] {
  width: auto; accent-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 28px;
  font-size: .95rem; font-weight: 600;
  border: none; border-radius: 8px;
  cursor: pointer;
  transition: all .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-200); }

/* Tool Results */
.tool-result {
  display: none;
  margin-top: 24px;
  padding: 24px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
}
.tool-result.show { display: block; }
.result-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
}
.result-card h4 { font-size: .95rem; font-weight: 700; color: var(--gray-900); margin-bottom: 4px; }
.result-card .score { color: var(--primary); font-weight: 700; }
.result-card p { font-size: .85rem; color: var(--gray-500); }
.match-high { border-left: 4px solid var(--green-500); }
.match-mid { border-left: 4px solid var(--amber-500); }
.match-low { border-left: 4px solid var(--gray-300); }

/* Algorithm Section */
.algorithm-section {
  margin-top: 40px;
  padding: 32px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
}
.algorithm-section h2 {
  font-size: 1.3rem; font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
}
.algorithm-section h3 {
  font-size: 1.05rem; font-weight: 600;
  color: var(--gray-700);
  margin: 20px 0 10px;
}
.algorithm-section p { font-size: .9rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 10px; }
.algorithm-section ul { margin: 8px 0 16px 20px; }
.algorithm-section li { font-size: .9rem; color: var(--gray-600); margin-bottom: 6px; }
.algorithm-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: .875rem;
}
.algorithm-table th {
  background: var(--gray-50);
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 2px solid var(--gray-200);
}
.algorithm-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-600);
}
.algorithm-table tr:hover { background: var(--gray-50); }

/* About data */
.about-data {
  padding: 40px 0;
}
.about-data h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; }
.about-data p { font-size: .9rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 10px; }
.about-data ul { margin: 8px 0 16px 20px; }
.about-data li { font-size: .9rem; color: var(--gray-600); margin-bottom: 6px; }

/* CTA */
.cta-section {
  text-align: center;
  padding: 48px 0;
  border-top: 1px solid var(--gray-200);
}
.cta-section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 10px; }
.cta-section p { color: var(--gray-500); margin-bottom: 20px; }
.cta-btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  transition: all .2s;
}
.cta-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* Footer */
.site-footer {
  background: var(--gray-800);
  color: var(--gray-400);
  padding: 32px 0;
  text-align: center;
}
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 12px; flex-wrap: wrap; }
.footer-links a { color: var(--gray-400); font-size: .85rem; text-decoration: none; }
.footer-links a:hover { color: #fff; }
.footer-copy { font-size: .8rem; }

/* Tables in content */
.content-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: .875rem;
}
.content-table th {
  background: var(--primary-light);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid var(--primary);
  color: var(--gray-800);
}
.content-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-600);
}
.content-table tr:nth-child(even) { background: var(--gray-50); }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .tools-grid { grid-template-columns: 1fr; }
  .tool-interface { padding: 20px; }
}