/* Prefix: mbn- */
/* my-bmi.net - Personal BMI Tracker */
/* Author: Alex, Software Engineer, Denver */

:root {
  --mbn-primary: #7c3aed;
  --mbn-primary-dark: #6d28d9;
  --mbn-secondary: #f5f3ff;
  --mbn-accent: #a78bfa;
  --mbn-text: #1e1b4b;
  --mbn-text-light: #6b7280;
  --mbn-bg: #ffffff;
  --mbn-bg-alt: #f9fafb;
  --mbn-border: #e5e7eb;
  --mbn-success: #10b981;
  --mbn-warning: #f59e0b;
  --mbn-danger: #ef4444;
  --mbn-radius: 12px;
  --mbn-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --mbn-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--mbn-text);
  background: var(--mbn-bg);
  line-height: 1.6;
}

/* ====== 导航 ====== */
.mbn-nav {
  background: var(--mbn-bg);
  border-bottom: 1px solid var(--mbn-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.mbn-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.mbn-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--mbn-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.mbn-logo-icon {
  width: 32px;
  height: 32px;
  color: var(--mbn-primary);
}

.mbn-nav-links {
  display: flex;
  gap: 32px;
}

.mbn-nav-links a {
  text-decoration: none;
  color: var(--mbn-text-light);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
  padding: 8px 0;
}

.mbn-nav-links a:hover,
.mbn-nav-links a.mbn-active {
  color: var(--mbn-primary);
}

.mbn-hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--mbn-text);
  cursor: pointer;
  padding: 8px;
}

/* ====== 主内容区 ====== */
.mbn-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* ====== 工具卡片 ====== */
.mbn-tool-card {
  background: var(--mbn-bg);
  border: 1px solid var(--mbn-border);
  border-radius: var(--mbn-radius);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: var(--mbn-shadow);
}

.mbn-tool-card h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  color: var(--mbn-text);
}

/* ====== 表单 ====== */
.mbn-form-group {
  margin-bottom: 20px;
}

.mbn-form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--mbn-text);
  font-size: 0.9rem;
}

.mbn-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--mbn-border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
  font-family: inherit;
}

.mbn-input:focus {
  outline: none;
  border-color: var(--mbn-primary);
}

.mbn-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: inherit;
}

.mbn-btn-primary {
  background: var(--mbn-primary);
  color: white;
}

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

.mbn-btn-secondary {
  background: var(--mbn-secondary);
  color: var(--mbn-primary);
}

.mbn-btn-secondary:hover {
  background: var(--mbn-accent);
}

/* ====== 结果展示 ====== */
.mbn-result {
  background: var(--mbn-secondary);
  border-radius: var(--mbn-radius);
  padding: 24px;
  margin-top: 24px;
  text-align: center;
}

.mbn-result-value {
  font-size: 3rem;
  font-weight: 700;
  color: var(--mbn-primary);
  line-height: 1;
}

.mbn-result-label {
  color: var(--mbn-text-light);
  margin-top: 8px;
  font-size: 0.9rem;
}

.mbn-result-category {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.85rem;
  margin-top: 12px;
}

.mbn-category-normal { background: #d1fae5; color: #065f46; }
.mbn-category-overweight { background: #fef3c7; color: #92400e; }
.mbn-category-obese { background: #fee2e2; color: #991b1b; }
.mbn-category-underweight { background: #dbeafe; color: #1e40af; }

/* ====== 历史记录 ====== */
.mbn-history {
  margin-top: 32px;
}

.mbn-history h3 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.mbn-history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.mbn-history-table th,
.mbn-history-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--mbn-border);
}

.mbn-history-table th {
  font-weight: 600;
  color: var(--mbn-text-light);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mbn-history-table tr:hover {
  background: var(--mbn-bg-alt);
}

/* ====== 图表区 ====== */
.mbn-chart-container {
  background: var(--mbn-bg);
  border: 1px solid var(--mbn-border);
  border-radius: var(--mbn-radius);
  padding: 24px;
  margin-top: 24px;
  height: 300px;
  position: relative;
}

/* ====== 文章板块 ====== */
.mbn-articles-section {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 2px solid var(--mbn-border);
}

.mbn-articles-section h2 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.mbn-articles-sub {
  color: var(--mbn-text-light);
  margin-bottom: 24px;
}

.mbn-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}

.mbn-article-card {
  background: var(--mbn-bg);
  border: 1px solid var(--mbn-border);
  border-radius: var(--mbn-radius);
  padding: 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.mbn-article-card:hover {
  box-shadow: var(--mbn-shadow-lg);
  transform: translateY(-2px);
}

.mbn-article-card h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.mbn-article-card h4 a {
  color: var(--mbn-text);
  text-decoration: none;
}

.mbn-article-card h4 a:hover {
  color: var(--mbn-primary);
}

.mbn-article-card p {
  color: var(--mbn-text-light);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.mbn-article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--mbn-text-light);
}

.mbn-loading {
  text-align: center;
  color: var(--mbn-text-light);
  padding: 40px;
  font-style: italic;
}

.mbn-articles-more {
  text-align: center;
  margin-top: 24px;
}

/* ====== 页脚 ====== */
.mbn-footer {
  background: var(--mbn-bg-alt);
  border-top: 1px solid var(--mbn-border);
  margin-top: 64px;
  padding: 40px 20px;
}

.mbn-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.mbn-footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.mbn-footer-links a {
  color: var(--mbn-text-light);
  text-decoration: none;
  font-size: 0.9rem;
}

.mbn-footer-links a:hover {
  color: var(--mbn-primary);
}

.mbn-footer-copy {
  color: var(--mbn-text-light);
  font-size: 0.85rem;
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .mbn-nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--mbn-bg);
    flex-direction: column;
    padding: 16px 20px;
    gap: 0;
    border-bottom: 1px solid var(--mbn-border);
    box-shadow: var(--mbn-shadow);
  }

  .mbn-nav-links.mbn-open {
    display: flex;
  }

  .mbn-nav-links a {
    padding: 12px 0;
    border-bottom: 1px solid var(--mbn-border);
  }

  .mbn-hamburger {
    display: block;
  }

  .mbn-main {
    padding: 20px 16px;
  }

  .mbn-tool-card {
    padding: 20px;
  }

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

  .mbn-result-value {
    font-size: 2.5rem;
  }

  .mbn-history-table {
    font-size: 0.8rem;
  }

  .mbn-history-table th,
  .mbn-history-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  .mbn-logo span {
    display: none;
  }

  .mbn-result-value {
    font-size: 2rem;
  }
}