/* ============================================================
   Baby Formula Tool — Global Stylesheet
   Prefix: bft-
   Domain: babyformulatool.com
   ============================================================ */

/* ---- Google Fonts ---- */
/* ---- CSS Variables ---- */
:root {
  --bft-primary: #FF6B6B;
  --bft-primary-dark: #e85555;
  --bft-primary-light: #ffe0e0;
  --bft-secondary: #4ECDC4;
  --bft-secondary-light: #e0f7f5;
  --bft-accent: #FFE66D;
  --bft-accent-light: #fff8d6;
  --bft-bg: #FFF5F5;
  --bft-bg-alt: #ffeded;
  --bft-text: #2D3436;
  --bft-text-secondary: #636e72;
  --bft-text-muted: #b2bec3;
  --bft-white: #ffffff;
  --bft-border: #e8e4df;
  --bft-border-light: #f0ede8;
  --bft-shadow: 0 2px 8px rgba(45, 52, 54, 0.06);
  --bft-shadow-hover: 0 4px 12px rgba(45, 52, 54, 0.10);
  --bft-radius-sm: 1px;
  --bft-radius-md: 1px;
  --bft-radius-lg: 1px;
  --bft-radius-xl: 1px;
  --bft-font-heading: 'Oswald', sans-serif;
  --bft-font-body: 'Roboto', 'Segoe UI', system-ui, sans-serif;
  --bft-font-mono: 'Ubuntu Mono', monospace;
  --bft-max-width: 1200px;
  --bft-ad-bg: #f5f5f5;
}

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

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

body {
  font-family: var(--bft-font-body);
  color: var(--bft-text);
  background: var(--bft-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--bft-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--bft-primary-dark);
}

/* ---- Container ---- */
.bft-container {
  width: 100%;
  max-width: var(--bft-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.bft-container-narrow {
  max-width: 800px;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--bft-font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--bft-text);
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }

p {
  margin-bottom: 1.2rem;
  color: var(--bft-text-secondary);
}

.bft-section-title {
  font-family: var(--bft-font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
}

.bft-section-subtitle {
  text-align: center;
  color: var(--bft-text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 3rem;
}

/* ---- Navigation ---- */
.bft-nav {
  background: var(--bft-white);
  border-bottom: 1px solid var(--bft-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 10px rgba(0,0,0,0.03);
}

.bft-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.bft-logo {
  font-family: var(--bft-font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--bft-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bft-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--bft-primary), var(--bft-secondary));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  font-weight: 700;
}

.bft-nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.bft-nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--bft-text-secondary);
  padding: 0.5rem 0;
  position: relative;
}

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

.bft-nav-links a.bft-active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--bft-primary);
  border-radius: 2px;
}

.bft-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--bft-text);
  cursor: pointer;
}

/* ---- Buttons ---- */
.bft-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  font-family: var(--bft-font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--bft-radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

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

.bft-btn-primary:hover {
  background: var(--bft-primary-dark);
  color: var(--bft-white);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(74, 144, 164, 0.3);
}

.bft-btn-secondary {
  background: var(--bft-secondary);
  color: var(--bft-white);
}

.bft-btn-secondary:hover {
  background: #e08c4a;
  color: var(--bft-white);
}

.bft-btn-outline {
  background: transparent;
  color: var(--bft-primary);
  border: 2px solid var(--bft-primary);
}

.bft-btn-outline:hover {
  background: var(--bft-primary);
  color: var(--bft-white);
}

.bft-btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
}

.bft-btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.05rem;
}

/* ---- Cards ---- */
.bft-card {
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  overflow: hidden;
  transition: all 0.3s ease;
}

.bft-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--bft-shadow-hover);
}

/* ---- Article Cards (整卡片可点击) ---- */
.bft-article-card {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1.2rem;
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  overflow: hidden;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  margin-bottom: 1rem;
}

.bft-article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bft-shadow-hover);
}

.bft-article-card img,
.bft-article-card p,
.bft-article-card span,
.bft-article-card h3,
.bft-article-card .bft-meta {
  pointer-events: none;
}

.bft-article-card .bft-card-img {
  width: 160px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--bft-radius-sm);
  flex-shrink: 0;
}

.bft-article-card .bft-card-body {
  flex: 1;
  min-width: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.bft-article-card .bft-card-title {
  font-family: var(--bft-font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--bft-text);
  line-height: 1.4;
}

.bft-article-card .bft-card-excerpt {
  font-size: 0.9rem;
  color: var(--bft-text-secondary);
  line-height: 1.5;
  margin-bottom: 0.6rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bft-article-card .bft-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--bft-text-muted);
}

.bft-article-card .bft-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

@media (max-width: 600px) {
  .bft-article-card {
    gap: 0.8rem;
    padding: 0.8rem;
  }
  .bft-article-card .bft-card-img {
    width: 100px;
    height: 75px;
  }
  .bft-article-card .bft-card-title {
    font-size: 1rem;
  }
  .bft-article-card .bft-card-excerpt {
    font-size: 0.85rem;
  }
}

/* ---- Tool Cards (整卡片可点击) ---- */
.bft-tool-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  padding: 2rem;
  transition: all 0.3s ease;
  border: 1px solid var(--bft-border-light);
}

.bft-tool-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--bft-shadow-hover);
  border-color: var(--bft-primary-light);
}

.bft-tool-card img,
.bft-tool-card p,
.bft-tool-card span,
.bft-tool-card h3 {
  pointer-events: none;
}

.bft-tool-card .bft-tool-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--bft-primary-light), var(--bft-secondary-light));
  border-radius: var(--bft-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.2rem;
  font-size: 1.5rem;
  color: var(--bft-primary);
}

.bft-tool-card .bft-tool-title {
  font-family: var(--bft-font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--bft-text);
}

.bft-tool-card .bft-tool-desc {
  font-size: 0.9rem;
  color: var(--bft-text-secondary);
  line-height: 1.6;
}

/* ---- Ad Boxes (改造计划标准) ---- */
.bft-ad-box {
  width: 100% !important;
  height: 250px;
  display: none;
  margin: 1rem 0;
  grid-column: 1 / -1;
  background: var(--bft-ad-bg, #f5f5f5);
  border-radius: 1px;
  overflow: hidden;
  position: relative;
}

.bft-ad-box.has-content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.bft-ad-label {
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--bft-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.bft-ad-content {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---- Grids ---- */
.bft-grid {
  display: grid;
  gap: 1.5rem;
}

.bft-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.bft-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.bft-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.bft-blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.bft-tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ---- Hero Section ---- */
.bft-hero {
  background: linear-gradient(135deg, var(--bft-primary-light) 0%, var(--bft-bg) 50%, var(--bft-secondary-light) 100%);
  padding: 5rem 0 4rem;
  text-align: center;
  border-radius: 0 0 var(--bft-radius-lg) var(--bft-radius-lg);
  margin-bottom: 3rem;
}

.bft-hero-title {
  font-family: var(--bft-font-heading);
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 700;
  color: var(--bft-text);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.bft-hero-subtitle {
  font-size: 1.15rem;
  color: var(--bft-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.bft-hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Stats Bar ---- */
.bft-stats {
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  padding: 2rem;
  margin: 2rem 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.bft-stat-item .bft-stat-number {
  font-family: var(--bft-font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--bft-primary);
  display: block;
}

.bft-stat-item .bft-stat-label {
  font-size: 0.88rem;
  color: var(--bft-text-secondary);
  margin-top: 0.3rem;
}

/* ---- Sections ---- */
.bft-section {
  padding: 4rem 0;
}

.bft-section-alt {
  background: var(--bft-bg-alt);
  border-radius: var(--bft-radius-lg);
  margin: 2rem 0;
  padding: 4rem 0;
}

/* ---- Footer ---- */
.bft-footer {
  background: var(--bft-text);
  color: var(--bft-text-muted);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
  border-radius: var(--bft-radius-lg) var(--bft-radius-lg) 0 0;
}

.bft-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2rem;
  align-items: start;
}

.bft-footer h4 {
  font-family: var(--bft-font-heading);
  font-size: 1.1rem;
  color: var(--bft-white);
  margin-bottom: 1rem;
}

.bft-footer ul {
  list-style: none;
}

.bft-footer li {
  margin-bottom: 0.6rem;
}

.bft-footer a {
  color: var(--bft-text-muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.bft-footer a:hover {
  color: var(--bft-secondary);
}

.bft-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

/* ---- Back to Top ---- */
.bft-back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--bft-primary);
  color: var(--bft-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 999;
  box-shadow: 0 4px 15px rgba(74, 144, 164, 0.3);
}

.bft-back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.bft-back-to-top:hover {
  background: var(--bft-primary-dark);
  transform: translateY(-3px);
}

/* ---- Breadcrumb ---- */
.bft-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--bft-text-muted);
  margin-bottom: 1.5rem;
  padding: 0.8rem 0;
}

.bft-breadcrumb a {
  color: var(--bft-text-secondary);
}

.bft-breadcrumb a:hover {
  color: var(--bft-primary);
}

.bft-breadcrumb-sep {
  color: var(--bft-text-muted);
}

.bft-breadcrumb-current {
  color: var(--bft-text);
  font-weight: 500;
}

/* ---- Article Content ---- */
.bft-article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--bft-text);
}

.bft-article-content h2 {
  font-family: var(--bft-font-heading);
  font-size: 1.6rem;
  margin: 2.5rem 0 1rem;
  color: var(--bft-text);
}

.bft-article-content p {
  margin-bottom: 1.5rem;
  color: var(--bft-text-secondary);
}

.bft-article-content img {
  border-radius: var(--bft-radius-md);
  margin: 2rem 0;
  box-shadow: var(--bft-shadow);
}

/* ---- Tool Card in Article ---- */
.bft-inline-tool {
  background: linear-gradient(135deg, var(--bft-primary-light), var(--bft-secondary-light));
  border-radius: var(--bft-radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  border-left: 4px solid var(--bft-primary);
}

.bft-inline-tool h4 {
  font-family: var(--bft-font-heading);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--bft-text);
}

.bft-inline-tool p {
  font-size: 0.95rem;
  color: var(--bft-text-secondary);
  margin-bottom: 1rem;
}

/* ---- Inline Tool Card (new structure: div+div+div+em) ---- */
a.bft-inline-tool {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.bft-inline-tool > div:first-child {
  font-size: 1.5rem;
  margin-bottom: 0.3rem;
}

.bft-inline-tool > div:nth-child(2) {
  font-family: var(--bft-font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bft-text);
}

.bft-inline-tool > div:nth-child(3) {
  font-size: 0.95rem;
  color: var(--bft-text-secondary);
  line-height: 1.6;
}

.bft-inline-tool em {
  font-size: 0.82rem;
  color: var(--bft-text-muted);
  font-style: normal;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(74, 144, 164, 0.15);
}

a.bft-inline-tool * {
  pointer-events: none;
}


/* ---- Author Box ---- */
.bft-author-box {
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin: 3rem 0;
}

.bft-author-box img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.bft-author-box h4 {
  font-family: var(--bft-font-heading);
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}

.bft-author-box .bft-author-role {
  font-size: 0.88rem;
  color: var(--bft-primary);
  font-weight: 500;
  margin-bottom: 0.8rem;
}

.bft-author-box p {
  font-size: 0.92rem;
  color: var(--bft-text-secondary);
  line-height: 1.7;
}

/* ---- Related Section (两栏视觉平衡) ---- */
.bft-related-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 3rem 0;
}

.bft-related-articles,
.bft-related-tools {
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  padding: 1.5rem;
}

.bft-related-section h3 {
  font-family: var(--bft-font-heading);
  font-size: 1.15rem;
  margin-bottom: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 2px solid var(--bft-border-light);
}

.bft-related-list {
  list-style: none;
}

.bft-related-list li {
  margin-bottom: 0.8rem;
}

.bft-related-list a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--bft-text-secondary);
  transition: color 0.2s;
}

.bft-related-list a:hover {
  color: var(--bft-primary);
}

/* ---- FAQ Accordion ---- */
.bft-faq-item {
  background: var(--bft-white);
  border-radius: var(--bft-radius-sm);
  margin-bottom: 1rem;
  box-shadow: var(--bft-shadow);
  overflow: hidden;
}

.bft-faq-question {
  padding: 1.2rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.bft-faq-question:hover {
  background: var(--bft-bg-alt);
}

.bft-faq-answer {
  padding: 0 1.5rem 1.2rem;
  font-size: 0.95rem;
  color: var(--bft-text-secondary);
  line-height: 1.7;
  display: none;
}

.bft-faq-item.open .bft-faq-answer {
  display: block;
}

.bft-faq-item.open .bft-faq-icon {
  transform: rotate(180deg);
}

/* ---- 404 Page ---- */
.bft-404 {
  text-align: center;
  padding: 6rem 0;
}

.bft-404-title {
  font-family: var(--bft-font-heading);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  color: var(--bft-primary);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: 1rem;
}

.bft-404-subtitle {
  font-family: var(--bft-font-heading);
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--bft-text);
}

.bft-404-joke {
  font-size: 1.1rem;
  color: var(--bft-text-secondary);
  margin-bottom: 0.5rem;
}

.bft-404-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* ---- Tool Page Layouts ---- */
.bft-tool-page {
  background: var(--bft-white);
  border-radius: var(--bft-radius-md);
  box-shadow: var(--bft-shadow);
  padding: 2rem;
  margin-bottom: 2rem;
}

.bft-tool-page h1 {
  font-family: var(--bft-font-heading);
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.bft-tool-page .bft-tool-desc {
  color: var(--bft-text-secondary);
  margin-bottom: 2rem;
}

.bft-input-group {
  margin-bottom: 1.2rem;
}

.bft-input-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bft-text);
  margin-bottom: 0.4rem;
}

.bft-input-group input,
.bft-input-group select,
.bft-input-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 2px solid var(--bft-border);
  border-radius: var(--bft-radius-sm);
  font-family: var(--bft-font-body);
  font-size: 0.95rem;
  color: var(--bft-text);
  background: var(--bft-white);
  transition: border-color 0.2s;
}

.bft-input-group input:focus,
.bft-input-group select:focus,
.bft-input-group textarea:focus {
  outline: none;
  border-color: var(--bft-primary);
}

.bft-input-group input[type="number"] {
  max-width: 200px;
}

.bft-form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.bft-result-box {
  background: var(--bft-primary-light);
  border-radius: var(--bft-radius-sm);
  padding: 1.5rem;
  margin: 1.5rem 0;
  border-left: 4px solid var(--bft-primary);
}

.bft-result-box h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--bft-text);
}

.bft-result-number {
  font-family: var(--bft-font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--bft-primary);
}

.bft-chart-container {
  width: 100%;
  height: 350px;
  margin: 2rem 0;
  background: var(--bft-bg);
  border-radius: var(--bft-radius-sm);
  padding: 1rem;
}

.bft-history-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.bft-history-table th,
.bft-history-table td {
  padding: 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--bft-border);
}

.bft-history-table th {
  font-weight: 600;
  color: var(--bft-text);
  background: var(--bft-bg-alt);
}

.bft-history-table td {
  color: var(--bft-text-secondary);
}

.bft-btn-danger {
  background: var(--bft-accent-light);
  color: var(--bft-accent);
  border: 1px solid var(--bft-accent);
}

.bft-btn-danger:hover {
  background: var(--bft-accent);
  color: var(--bft-white);
}

.bft-btn-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* ---- Contact Page ---- */
.bft-contact-box {
  background: var(--bft-bg-alt);
  border-radius: var(--bft-radius-md);
  padding: 2rem;
  margin: 2rem 0;
  border-left: 4px solid var(--bft-secondary);
}

.bft-contact-box p {
  font-size: 1rem;
  color: var(--bft-text);
  line-height: 1.8;
}

.bft-contact-email {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bft-primary);
  margin: 1rem 0;
  display: inline-block;
}

.bft-contact-note {
  font-size: 0.9rem;
  color: var(--bft-text-muted);
  margin-top: 1rem;
}

/* ---- About Page ---- */
.bft-about-hero {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  margin-bottom: 3rem;
}

.bft-about-hero img {
  width: 200px;
  height: 250px;
  border-radius: var(--bft-radius-lg);
  object-fit: cover;
  box-shadow: var(--bft-shadow-hover);
  flex-shrink: 0;
}

.bft-about-hero h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.bft-about-hero .bft-role {
  font-size: 1rem;
  color: var(--bft-primary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.bft-about-hero p {
  font-size: 1.05rem;
  line-height: 1.8;
}

.bft-timeline {
  position: relative;
  padding-left: 2rem;
  margin: 2rem 0;
}

.bft-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--bft-primary), var(--bft-secondary));
  border-radius: 3px;
}

.bft-timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1.5rem;
}

.bft-timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.3rem;
  width: 12px;
  height: 12px;
  background: var(--bft-primary);
  border-radius: 50%;
  border: 3px solid var(--bft-white);
  box-shadow: 0 0 0 3px var(--bft-primary-light);
}

.bft-timeline-item h4 {
  font-family: var(--bft-font-heading);
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.bft-timeline-item .bft-year {
  font-size: 0.85rem;
  color: var(--bft-primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.bft-timeline-item p {
  font-size: 0.95rem;
  color: var(--bft-text-secondary);
}

/* ---- Responsive ---- */
@media (max-width: 992px) {
  .bft-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .bft-blog-grid { grid-template-columns: repeat(2, 1fr); }
  .bft-tools-grid { grid-template-columns: repeat(2, 1fr); }
  .bft-stats { grid-template-columns: repeat(2, 1fr); }
  .bft-related-section { grid-template-columns: 1fr; }
  .bft-about-hero { flex-direction: column; align-items: center; text-align: center; }
  .bft-about-hero img { width: 150px; height: 150px; }
}

@media (max-width: 768px) {
  .bft-nav-links { display: none; }
  .bft-nav-toggle { display: block; }
  .bft-grid-3,
  .bft-grid-2,
  .bft-blog-grid,
  .bft-tools-grid { grid-template-columns: 1fr; }
  .bft-grid-4 { grid-template-columns: 1fr; }
  .bft-stats { grid-template-columns: repeat(2, 1fr); }
  .bft-footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; text-align: left; }
  .bft-footer-grid > div:first-child { grid-column: 1 / -1; text-align: center; }
  .bft-hero { padding: 3rem 0; }
  .bft-section { padding: 2.5rem 0; }
  .bft-author-box { flex-direction: column; align-items: center; text-align: center; }
  .bft-form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .bft-stats { grid-template-columns: 1fr; }
  .bft-footer-grid { grid-template-columns: 1fr; text-align: center; }
  .bft-hero-cta { flex-direction: column; }
  .bft-hero-cta .bft-btn { width: 100%; }
  .bft-container { padding: 0 1rem; }
}

/* ---- Utility ---- */
.bft-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.bft-text-center { text-align: center; }
.bft-mt-2 { margin-top: 2rem; }
.bft-mb-2 { margin-bottom: 2rem; }
.bft-hidden { display: none; }


.bft-post-header {
  margin-bottom: 24px;
}
.bft-post-header h1 {
  font-size: 2.2rem;
  line-height: 1.3;
  margin-bottom: 12px;
}
.bft-post-meta {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 12px;
}
.bft-category-badge {
  display: inline-block;
  padding: 4px 12px;
  background: #e8f0fe;
  color: #1a73e8;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}
.bft-article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}
.bft-post-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}
.bft-post-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #333;
}
.bft-post-content p {
  margin-bottom: 1.2em;
}
.bft-post-content h2 {
  font-size: 1.6rem;
  margin-top: 2em;
  margin-bottom: 0.8em;
}
.bft-post-content h3 {
  font-size: 1.3rem;
  margin-top: 1.6em;
  margin-bottom: 0.6em;
}
.bft-post-footer {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  max-width: 800px;
  margin: 40px auto 0;
  padding: 0 20px;
}
@media (max-width: 768px) {
  .bft-post-footer {
    grid-template-columns: 1fr;
  }
}
.bft-related-articles h3,
.bft-recommended-tools h3 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #eee;
}
.bft-related-list,
.bft-tool-rec-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bft-related-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  padding: 16px;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #eee;
  transition: box-shadow 0.2s, transform 0.2s;
}
.bft-related-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.bft-related-card * {
  pointer-events: none;
}
.bft-related-card h4 {
  font-size: 1rem;
  margin-bottom: 6px;
  color: #1a73e8;
}
.bft-related-card p {
  font-size: 0.85rem;
  color: #666;
  margin: 0;
}
.bft-author-box {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: #f8f9fa;
  border-radius: 12px;
  margin: 32px 0;
  align-items: flex-start;
}
@media (max-width: 768px) {
  .bft-author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}
.bft-author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.bft-author-info {
  flex: 1;
}
.bft-author-name {
  font-size: 1.1rem;
  margin-bottom: 4px;
}
.bft-author-title {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 8px;
}
.bft-author-bio {
  font-size: 0.95rem;
  line-height: 1.6;
  color: #444;
  margin-bottom: 8px;
}
.bft-author-location {
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 8px;
}
.bft-author-bio-link {
  font-size: 0.9rem;
  color: #1a73e8;
  text-decoration: none;
}
.bft-author-bio-link:hover {
  text-decoration: underline;
}


/* ---- Navigation Container Fix ---- */
.bft-nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--bft-max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  box-sizing: border-box;
}


/* ---- Breadcrumb Align Fix ---- */
.bft-breadcrumb {
  max-width: var(--bft-max-width, 1200px);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  width: 100%;
  box-sizing: border-box;
}


/* ---- Mobile Menu Active Fix ---- */
@media (max-width: 768px) {
  .bft-nav-links {
    display: none !important;
    flex-direction: column;
    width: 100%;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 1.5rem;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    z-index: 999;
  }
  .bft-nav-links.bft-mobile-open {
    display: flex !important;
  }
  .bft-nav-links li {
    width: 100%;
    list-style: none;
  }
  .bft-nav-links a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f0f0f0;
    text-decoration: none;
    color: inherit;
  }
  .bft-nav-links a:last-child {
    border-bottom: none;
  }
}


/* ---- Hamburger Button Fix ---- */
.bft-nav-hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}
@media (max-width: 768px) {
  .bft-nav-hamburger {
    display: block !important;
  }
}

/* === MOBILE NAV OVERRIDE === */
/* 强制覆盖所有前面的 display 定义，确保移动端导航正常展开 */
@media (max-width: 768px) {
  .bft-nav-toggle {
    display: block !important;
  }
  .bft-nav-links {
    display: none !important;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    flex-direction: column !important;
    gap: 0 !important;
    padding: 8px 0;
    box-shadow: 0 10px 25px rgba(15,23,42,0.1);
    z-index: 999;
    list-style: none;
    margin: 0;
  }
  .bft-nav-links.bft-mobile-open {
    display: flex !important;
  }
  .bft-nav-links li {
    width: 100%;
    list-style: none;
  }
  .bft-nav-links a {
    display: block;
    padding: 12px 24px;
    border-bottom: 1px solid #f0f0f0;
    text-decoration: none;
    color: inherit;
    width: 100%;
  }
  .bft-nav-links a:last-child {
    border-bottom: none;
  }
}