/* bedtimecycle.com — Sleep Science Tools */
/* Prefix: btc- | Palette: Midnight Blue + Warm Amber */

:root {
  --btc-primary: #1a237e;
  --btc-primary-dark: #0d1642;
  --btc-primary-light: #3949ab;
  --btc-accent: #ff6f00;
  --btc-accent-light: #ff9e40;
  --btc-accent-bg: #fff3e0;
  --btc-bg: #faf8f5;
  --btc-surface: #ffffff;
  --btc-text: #2d2d2d;
  --btc-text-muted: #6b6b6b;
  --btc-border: #e8e4df;
  --btc-border-light: #f0ece7;
  --btc-success: #2e7d32;
  --btc-warning: #ed6c02;
  --btc-error: #d32f2f;
  --btc-radius: 12px;
  --btc-radius-sm: 8px;
  --btc-shadow: 0 4px 20px rgba(26,35,126,0.08);
  --btc-shadow-lg: 0 8px 40px rgba(26,35,126,0.12);
  --btc-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --btc-font-heading: 'Playfair Display', Georgia, serif;
  --btc-max-width: 1200px;
  --btc-transition: all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--btc-font-body);
  color: var(--btc-text);
  background: var(--btc-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--btc-primary); text-decoration: none; transition: var(--btc-transition); }
a:hover { color: var(--btc-accent); }

/* Container */
.btc-container {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.btc-nav {
  background: var(--btc-surface);
  border-bottom: 1px solid var(--btc-border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.btc-nav-inner {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.btc-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--btc-font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--btc-primary);
  text-decoration: none;
}

.btc-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--btc-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.btc-nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.btc-nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--btc-text);
  padding: 4px 0;
  position: relative;
}

.btc-nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--btc-accent);
  transition: var(--btc-transition);
}

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

.btc-nav-links a.btc-active { color: var(--btc-primary); font-weight: 600; }

.btc-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--btc-primary);
  padding: 8px;
}

/* Mobile Nav */
@media (max-width: 768px) {
  .btc-nav-links {
    display: none !important;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--btc-surface);
    flex-direction: column !important;
    padding: 16px 24px;
    gap: 0;
    border-top: 1px solid var(--btc-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    z-index: 999;
  }
  .btc-nav-links.btc-mobile-open {
    display: flex !important;
  }
  .btc-nav-links li { width: 100%; border-bottom: 1px solid var(--btc-border-light); }
  .btc-nav-links li:last-child { border-bottom: none; }
  .btc-nav-links a { display: block; padding: 12px 0; }
  .btc-nav-links a::after { display: none; }
  .btc-nav-toggle { display: block; }
}

/* Hero — Story Narrative Style */
.btc-hero {
  background: var(--btc-primary);
  color: #fff;
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}

.btc-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255,111,0,0.08);
  border-radius: 50%;
  pointer-events: none;
}

.btc-hero-inner {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.btc-hero-label {
  display: inline-block;
  background: rgba(255,111,0,0.15);
  color: var(--btc-accent-light);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.btc-hero h1 {
  font-family: var(--btc-font-heading);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  max-width: 700px;
}

.btc-hero p {
  font-size: 1.15rem;
  opacity: 0.85;
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.btc-hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Buttons */
.btc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--btc-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--btc-transition);
  border: 2px solid transparent;
  text-decoration: none;
}

.btc-btn-primary {
  background: var(--btc-accent);
  color: #fff;
  border-color: var(--btc-accent);
}

.btc-btn-primary:hover {
  background: var(--btc-accent-light);
  border-color: var(--btc-accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,111,0,0.3);
}

.btc-btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}

.btc-btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

.btc-btn-secondary {
  background: var(--btc-surface);
  color: var(--btc-primary);
  border-color: var(--btc-border);
}

.btc-btn-secondary:hover {
  background: var(--btc-primary);
  color: #fff;
  border-color: var(--btc-primary);
}

.btc-btn-lg { padding: 16px 36px; font-size: 1.05rem; }

/* Stats Bar */
.btc-stats-bar {
  background: var(--btc-surface);
  border-bottom: 1px solid var(--btc-border);
  padding: 32px 0;
}

.btc-stats-inner {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.btc-stat-value {
  font-family: var(--btc-font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--btc-primary);
  line-height: 1;
}

.btc-stat-label {
  font-size: 0.85rem;
  color: var(--btc-text-muted);
  margin-top: 8px;
}

@media (max-width: 768px) {
  .btc-stats-inner { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .btc-hero h1 { font-size: 2.2rem; }
  .btc-hero { padding: 60px 0 50px; }
}

/* Section */
.btc-section {
  padding: 80px 0;
}

.btc-section-alt {
  background: var(--btc-surface);
}

.btc-section-title {
  font-family: var(--btc-font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--btc-primary);
  margin-bottom: 16px;
  text-align: center;
}

.btc-section-subtitle {
  text-align: center;
  color: var(--btc-text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* Cards — Tool Cards */
.btc-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.btc-card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 992px) {
  .btc-card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .btc-card-grid-3 { grid-template-columns: 1fr; }
}

a.btc-tool-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius);
  padding: 32px;
  transition: var(--btc-transition);
  box-shadow: var(--btc-shadow);
}

a.btc-tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--btc-shadow-lg);
  border-color: var(--btc-accent);
}

a.btc-tool-card * { pointer-events: none; }

.btc-tool-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.btc-tool-card h3 {
  font-family: var(--btc-font-heading);
  font-size: 1.3rem;
  color: var(--btc-primary);
  margin-bottom: 10px;
}

.btc-tool-card p {
  color: var(--btc-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.btc-tool-tag {
  display: inline-block;
  background: var(--btc-accent-bg);
  color: var(--btc-accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  margin-top: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Article Cards */
a.btc-article-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  background: var(--btc-surface);
  border-radius: var(--btc-radius);
  overflow: hidden;
  box-shadow: var(--btc-shadow);
  transition: var(--btc-transition);
  border: 1px solid var(--btc-border);
}

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

a.btc-article-card * { pointer-events: none; }

.btc-article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.btc-article-card-body {
  padding: 24px;
}

.btc-article-card h3 {
  font-family: var(--btc-font-heading);
  font-size: 1.2rem;
  color: var(--btc-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.btc-article-card p {
  color: var(--btc-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.btc-article-meta {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--btc-text-muted);
}

/* Inline Tool Card in Articles */
a.btc-inline-tool {
  display: flex;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  background: var(--btc-accent-bg);
  border: 1px solid var(--btc-accent);
  border-radius: var(--btc-radius-sm);
  padding: 20px 24px;
  margin: 24px 0;
  gap: 16px;
  align-items: center;
  transition: var(--btc-transition);
}

a.btc-inline-tool:hover {
  background: #ffe8cc;
  transform: translateX(4px);
}

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

.btc-inline-tool-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.btc-inline-tool-content h4 {
  font-family: var(--btc-font-heading);
  font-size: 1.1rem;
  color: var(--btc-primary);
  margin-bottom: 4px;
}

.btc-inline-tool-content p {
  font-size: 0.9rem;
  color: var(--btc-text-muted);
  margin: 0;
}

.btc-inline-tool-arrow {
  margin-left: auto;
  font-size: 1.2rem;
  color: var(--btc-accent);
  flex-shrink: 0;
}

/* Privacy hint under inline tool */
.btc-privacy-hint {
  color: var(--btc-text-muted);
  font-size: 0.78rem;
  margin-top: 8px;
  font-style: italic;
}

/* Ad Slots */
.btc-ad-slot {
  display: none;
  max-width: var(--btc-max-width);
  margin: 32px auto;
  padding: 0 24px;
  min-height: 250px;
  background: var(--btc-border-light);
  border-radius: var(--btc-radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--btc-text-muted);
  font-size: 0.85rem;
  text-align: center;
}

.btc-ad-slot.has-content { display: flex; }

/* Footer */
.btc-footer {
  background: var(--btc-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 24px;
  margin-top: 80px;
}

.btc-footer-grid {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.btc-footer-brand {
  font-family: var(--btc-font-heading);
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 12px;
}

.btc-footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 300px;
}

.btc-footer h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.btc-footer li { margin-bottom: 10px; }

.btc-footer a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: var(--btc-transition);
}

.btc-footer a:hover { color: var(--btc-accent-light); }

.btc-footer-bottom {
  max-width: var(--btc-max-width);
  margin: 0 auto;
  padding: 24px 24px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

@media (max-width: 768px) {
  .btc-footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}

@media (max-width: 480px) {
  .btc-footer-grid { grid-template-columns: 1fr; }
}

/* Back to Top */
.btc-back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--btc-accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--btc-transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btc-back-to-top.visible { opacity: 1; visibility: visible; }
.btc-back-to-top:hover { background: var(--btc-accent-light); transform: translateY(-2px); }

/* Breadcrumb */
.btc-breadcrumb {
  max-width: var(--btc-max-width);
  margin: 16px auto;
  padding: 0 24px;
  font-size: 0.85rem;
  color: var(--btc-text-muted);
}

.btc-breadcrumb a { color: var(--btc-text-muted); }
.btc-breadcrumb a:hover { color: var(--btc-primary); }
.btc-breadcrumb-sep { margin: 0 8px; color: var(--btc-border); }

/* FAQ */
.btc-faq-item {
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}

.btc-faq-question {
  padding: 20px 24px;
  font-weight: 600;
  color: var(--btc-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.btc-faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.btc-faq-answer.active {
  padding: 0 24px 20px;
  max-height: 500px;
}

.btc-faq-answer p {
  color: var(--btc-text-muted);
  line-height: 1.7;
}

/* Article Content */
.btc-article-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px;
}

.btc-article-content h2 {
  font-family: var(--btc-font-heading);
  font-size: 1.8rem;
  color: var(--btc-primary);
  margin: 40px 0 20px;
}

.btc-article-content h3 {
  font-family: var(--btc-font-heading);
  font-size: 1.4rem;
  color: var(--btc-primary);
  margin: 32px 0 16px;
}

.btc-article-content p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.btc-article-content ul, .btc-article-content ol {
  margin: 20px 0;
  padding-left: 28px;
}

.btc-article-content li { margin-bottom: 10px; }

.btc-article-content blockquote {
  border-left: 4px solid var(--btc-accent);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--btc-text-muted);
  font-style: italic;
}

/* Author Box */
.btc-author-box {
  display: flex;
  gap: 20px;
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius);
  padding: 24px;
  margin: 40px 0;
}

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

.btc-author-box h4 {
  font-family: var(--btc-font-heading);
  font-size: 1.2rem;
  color: var(--btc-primary);
  margin-bottom: 4px;
}

.btc-author-box p {
  font-size: 0.9rem;
  color: var(--btc-text-muted);
  margin: 0;
}

/* Tool Page Layout */
.btc-tool-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
}

.btc-tool-header {
  text-align: center;
  margin-bottom: 40px;
}

.btc-tool-header h1 {
  font-family: var(--btc-font-heading);
  font-size: 2.2rem;
  color: var(--btc-primary);
  margin-bottom: 12px;
}

.btc-tool-header p {
  color: var(--btc-text-muted);
  font-size: 1.05rem;
}

.btc-tool-box {
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius);
  padding: 32px;
  margin-bottom: 32px;
}

.btc-input-group {
  margin-bottom: 20px;
}

.btc-input-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--btc-primary);
  margin-bottom: 8px;
}

.btc-input-group input,
.btc-input-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius-sm);
  font-size: 1rem;
  font-family: var(--btc-font-body);
  transition: var(--btc-transition);
  background: var(--btc-bg);
}

.btc-input-group input:focus,
.btc-input-group select:focus {
  outline: none;
  border-color: var(--btc-primary);
  box-shadow: 0 0 0 3px rgba(26,35,126,0.1);
}

.btc-calculate-btn {
  background: var(--btc-primary);
  color: #fff;
  border: none;
  padding: 14px 32px;
  border-radius: var(--btc-radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--btc-transition);
  width: 100%;
}

.btc-calculate-btn:hover {
  background: var(--btc-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26,35,126,0.2);
}

.btc-reset-btn {
  background: transparent;
  color: var(--btc-text-muted);
  border: 1px solid var(--btc-border);
  padding: 10px 20px;
  border-radius: var(--btc-radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--btc-transition);
  margin-top: 12px;
}

.btc-reset-btn:hover {
  background: var(--btc-border-light);
  color: var(--btc-text);
}

.btc-result-box {
  background: var(--btc-accent-bg);
  border: 1px solid var(--btc-accent);
  border-radius: var(--btc-radius-sm);
  padding: 24px;
  margin-top: 24px;
  display: none;
}

.btc-result-box.active { display: block; }

.btc-result-box h4 {
  font-family: var(--btc-font-heading);
  color: var(--btc-primary);
  margin-bottom: 12px;
}

.btc-chart-container {
  margin-top: 24px;
  padding: 16px;
  background: var(--btc-bg);
  border-radius: var(--btc-radius-sm);
  border: 1px solid var(--btc-border);
}

.btc-chart-container canvas {
  width: 100% !important;
  height: 300px !important;
}

/* History Table */
.btc-history-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 0.9rem;
}

.btc-history-table th,
.btc-history-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--btc-border);
}

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

.btc-history-table tr:hover td {
  background: var(--btc-border-light);
}

/* Comparison Feature */
.btc-compare-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

@media (max-width: 600px) {
  .btc-compare-row { grid-template-columns: 1fr; }
}

/* Export Button */
.btc-export-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  padding: 10px 20px;
  border-radius: var(--btc-radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--btc-transition);
  color: var(--btc-primary);
}

.btc-export-btn:hover {
  background: var(--btc-primary);
  color: #fff;
  border-color: var(--btc-primary);
}

/* Related Articles & Tools — Post Footer */
.btc-post-footer {
  max-width: 720px;
  margin: 48px auto 0;
  padding: 0 24px;
}

.btc-post-footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 768px) {
  .btc-post-footer-grid { grid-template-columns: 1fr; }
}

.btc-post-footer h3 {
  font-family: var(--btc-font-heading);
  font-size: 1.3rem;
  color: var(--btc-primary);
  margin-bottom: 20px;
}

.btc-related-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius-sm);
  padding: 16px 20px;
  margin-bottom: 12px;
  transition: var(--btc-transition);
}

.btc-related-card:hover {
  border-color: var(--btc-accent);
  transform: translateX(4px);
}

.btc-related-card h4 {
  font-size: 1rem;
  color: var(--btc-primary);
  margin-bottom: 4px;
}

.btc-related-card p {
  font-size: 0.85rem;
  color: var(--btc-text-muted);
  margin: 0;
}

/* Collection Page — Tools Index */
.btc-collection-header {
  text-align: center;
  padding: 60px 0 40px;
}

.btc-collection-header h1 {
  font-family: var(--btc-font-heading);
  font-size: 2.6rem;
  color: var(--btc-primary);
  margin-bottom: 12px;
}

.btc-collection-header p {
  color: var(--btc-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Blog Index */
.btc-blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

@media (max-width: 600px) {
  .btc-blog-grid { grid-template-columns: 1fr; }
}

/* Timeline — Story Narrative */
.btc-timeline {
  position: relative;
  padding-left: 32px;
}

.btc-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--btc-border);
}

.btc-timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.btc-timeline-dot {
  position: absolute;
  left: -28px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--btc-accent);
  border-radius: 50%;
  border: 3px solid var(--btc-surface);
  box-shadow: 0 0 0 2px var(--btc-accent);
}

.btc-timeline-content h4 {
  font-family: var(--btc-font-heading);
  font-size: 1.2rem;
  color: var(--btc-primary);
  margin-bottom: 8px;
}

.btc-timeline-content p {
  color: var(--btc-text-muted);
  font-size: 0.95rem;
}

/* About Page — Community Square */
.btc-about-hero {
  background: var(--btc-primary);
  color: #fff;
  padding: 80px 0 60px;
  text-align: center;
}

.btc-about-hero img {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255,255,255,0.2);
  margin: 0 auto 24px;
}

.btc-about-hero h1 {
  font-family: var(--btc-font-heading);
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.btc-about-hero p {
  opacity: 0.85;
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

.btc-credentials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 40px auto 0;
}

.btc-credential-item {
  text-align: center;
}

.btc-credential-item h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.btc-credential-item p {
  font-size: 0.85rem;
  opacity: 0.7;
  margin: 0;
}

@media (max-width: 600px) {
  .btc-credentials { grid-template-columns: 1fr; }
}

/* Contact Page — Minimal Card */
.btc-contact-card {
  max-width: 600px;
  margin: 0 auto;
  background: var(--btc-surface);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius);
  padding: 40px;
  text-align: center;
}

.btc-contact-card h2 {
  font-family: var(--btc-font-heading);
  font-size: 1.8rem;
  color: var(--btc-primary);
  margin-bottom: 16px;
}

.btc-contact-card p {
  color: var(--btc-text-muted);
  margin-bottom: 24px;
}

.btc-contact-email {
  display: inline-block;
  background: var(--btc-accent-bg);
  color: var(--btc-accent);
  padding: 12px 24px;
  border-radius: var(--btc-radius-sm);
  font-weight: 600;
  font-size: 1.1rem;
}

.btc-contact-declaration {
  max-width: 700px;
  margin: 40px auto 0;
  background: var(--btc-border-light);
  border: 1px solid var(--btc-border);
  border-radius: var(--btc-radius-sm);
  padding: 24px;
  color: var(--btc-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* 404 */
.btc-404 {
  text-align: center;
  padding: 120px 24px;
}

.btc-404 h1 {
  font-family: var(--btc-font-heading);
  font-size: 6rem;
  color: var(--btc-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.btc-404 p {
  color: var(--btc-text-muted);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

/* Utility */
.btc-text-center { text-align: center; }
.btc-mt-1 { margin-top: 8px; }
.btc-mt-2 { margin-top: 16px; }
.btc-mt-3 { margin-top: 24px; }
.btc-mt-4 { margin-top: 32px; }
.btc-mb-4 { margin-bottom: 32px; }

/* === Post Template V3.0 CSS Injection for btc === */

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


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


/* ---- Breadcrumb Align Fix ---- */
.btc-breadcrumb {
  max-width: var(--btc-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) {
  .btc-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;
  }
  .btc-nav-links.active {
    display: flex !important;
  }
  .btc-nav-links li {
    width: 100%;
    list-style: none;
  }
  .btc-nav-links a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f0f0f0;
    text-decoration: none;
    color: inherit;
  }
  .btc-nav-links a:last-child {
    border-bottom: none;
  }
}


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