/* ============================================
   451C.com - 数字能量分析网站
   干净清爽 · 现代设计
   ============================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --accent: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1200px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .2s;
}
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

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

/* --- Header / Navigation --- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,.95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--gray-900);
  letter-spacing: -0.5px;
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-sub {
  font-size: .75rem;
  color: var(--gray-400);
  font-weight: 400;
  margin-left: 4px;
  letter-spacing: 0;
}

.main-nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.main-nav a {
  color: var(--gray-600);
  font-size: .925rem;
  font-weight: 500;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width .25s ease;
  border-radius: 2px;
}

.main-nav a:hover::after,
.main-nav a.active::after { width: 100%; }

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .875rem !important;
  transition: all .2s;
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-700);
  padding: 4px;
}

/* --- Hero / 首页大标题 --- */
.hero {
  text-align: center;
  padding: 80px 20px 60px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  opacity: .9;
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* --- 分析器卡片 --- */
.analyzer-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-width: 520px;
  margin: -60px auto 60px;
  padding: 40px 36px;
  position: relative;
  z-index: 10;
}

.analyzer-card .input-group {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.analyzer-card input {
  flex: 1;
  padding: 14px 18px;
  font-size: 1.1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  font-family: var(--font-sans);
  letter-spacing: 2px;
}

.analyzer-card input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.analyzer-card input::placeholder {
  letter-spacing: normal;
  color: var(--gray-400);
}

.btn-analyze {
  padding: 14px 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}

.btn-analyze:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-analyze:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

.analyzer-hint {
  font-size: .8rem;
  color: var(--gray-500);
  text-align: center;
}

/* --- 分析结果 --- */
#result-area {
  display: none;
  animation: fadeUp .4s ease;
}

#result-area.visible { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-summary {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.result-score {
  display: flex;
  align-items: center;
  gap: 16px;
}

.score-ring {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.score-ring.excellent { background: linear-gradient(135deg, #10b981, #059669); }
.score-ring.good { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.score-ring.medium { background: linear-gradient(135deg, #f59e0b, #d97706); }
.score-ring.poor { background: linear-gradient(135deg, #ef4444, #dc2626); }

.result-verdict h3 {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.result-verdict p {
  color: var(--gray-500);
  font-size: .9rem;
}

.phone-display {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--gray-800);
  background: var(--gray-100);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
}

/* --- 磁场分段可视化 --- */
.segment-visualization {
  margin-bottom: 24px;
}

.segment-visualization h4 {
  font-size: .95rem;
  color: var(--gray-500);
  margin-bottom: 12px;
  font-weight: 600;
}

.segment-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.segment-block {
  flex: 1;
  min-width: 36px;
  text-align: center;
  padding: 8px 4px;
  border-radius: 6px;
  font-size: .8rem;
  font-weight: 600;
  transition: transform .15s;
  cursor: default;
}

.segment-block:hover {
  transform: translateY(-2px);
}

.segment-block .pair-num {
  display: block;
  font-size: .9rem;
}

.segment-block .field-label {
  display: block;
  font-size: .6rem;
  font-weight: 400;
  margin-top: 2px;
  opacity: .8;
}

/* --- 磁场统计 --- */
.field-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.field-stat-item {
  padding: 14px;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: all .2s;
}

.field-stat-item:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.field-stat-item .count {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.field-stat-item .label {
  font-size: .8rem;
  color: var(--gray-500);
}

/* --- 分析结果中的亮点和警告 --- */
.result-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.detail-card {
  padding: 20px;
  border-radius: var(--radius-sm);
}

.detail-card.highlights {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
}

.detail-card.warnings {
  background: #fef2f2;
  border: 1px solid #fecaca;
}

.detail-card h4 {
  font-size: .9rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.detail-card ul {
  list-style: none;
}

.detail-card li {
  font-size: .85rem;
  padding: 4px 0;
  color: var(--gray-600);
  line-height: 1.5;
}

.detail-card li::before {
  content: '•';
  margin-right: 8px;
  font-weight: bold;
}

.detail-card.highlights li::before { color: var(--success); }
.detail-card.warnings li::before { color: var(--danger); }

.tail-analysis {
  background: var(--gray-50);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  font-size: .9rem;
  color: var(--gray-600);
}

.tail-analysis strong {
  color: var(--gray-800);
}

/* --- 区域标题 --- */
.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.section-title p {
  color: var(--gray-500);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* --- 磁场知识卡片 --- */
.fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minMax(280px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.field-card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  padding: 24px;
  transition: all .25s;
  cursor: default;
}

.field-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.field-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.field-card-name {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.field-badge {
  font-size: .7rem;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 600;
}

.field-badge.auspicious {
  background: #d1fae5;
  color: #065f46;
}

.field-badge.inauspicious {
  background: #fee2e2;
  color: #991b1b;
}

.field-badge.neutral {
  background: #e2e8f0;
  color: #475569;
}

.field-numbers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.field-number-chip {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 600;
  color: #fff;
  transition: transform .15s;
}

.field-number-chip:hover {
  transform: scale(1.1);
}

.field-card p {
  font-size: .875rem;
  color: var(--gray-500);
  line-height: 1.6;
}

.field-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.field-keyword-tag {
  font-size: .7rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--gray-100);
  color: var(--gray-600);
}

/* --- 博客文章区域 --- */
.articles-section {
  background: #fff;
  border-top: 1px solid var(--gray-200);
  padding: 60px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--gray-200);
  transition: all .2s;
}

.article-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--gray-300);
}

.article-card .tag {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.article-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--gray-800);
}

.article-card h3 a:hover {
  color: var(--primary);
}

.article-card p {
  font-size: .85rem;
  color: var(--gray-500);
  line-height: 1.6;
}

.article-card .meta {
  font-size: .75rem;
  color: var(--gray-400);
  margin-top: 12px;
}

/* --- Footer --- */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: .85rem;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col h4 {
  color: #fff;
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-col a {
  display: block;
  color: var(--gray-400);
  font-size: .85rem;
  padding: 3px 0;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 20px;
  text-align: center;
  font-size: .8rem;
}

/* --- 加载动画 --- */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 3px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- 滚动到顶部 --- */
.scroll-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  display: none;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  z-index: 50;
}

.scroll-top.visible {
  display: flex;
}

.scroll-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* --- 尾号分析补充区 --- */
.result-footer-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn-secondary {
  padding: 10px 24px;
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}

.btn-secondary:hover {
  background: var(--gray-200);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .header-inner {
    height: 56px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 20px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--gray-200);
  }

  .main-nav.open {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 48px 20px 32px;
  }

  .analyzer-card {
    margin: -40px 16px 40px;
    padding: 24px 20px;
  }

  .analyzer-card .input-group {
    flex-direction: column;
  }

  .result-summary {
    flex-direction: column;
    align-items: stretch;
  }

  .result-details {
    grid-template-columns: 1fr;
  }

  .field-stats {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  .fields-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .segment-block {
    min-width: 28px;
    font-size: .7rem;
    padding: 6px 2px;
  }

  .segment-block .pair-num {
    font-size: .75rem;
  }

  .segment-block .field-label {
    font-size: .5rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .analyzer-card {
    padding: 20px 16px;
  }

  .phone-display {
    font-size: 1rem;
    letter-spacing: 2px;
  }

  .score-ring {
    width: 56px;
    height: 56px;
    font-size: 1.1rem;
  }
}

/* --- 打印样式 --- */
@media print {
  .site-header, .hero, .site-footer, .scroll-top {
    display: none !important;
  }

  .analyzer-card {
    box-shadow: none;
    border: 1px solid #ddd;
    margin-top: 0;
  }
}