@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Poppins:wght@500;600;700;800&display=swap');

/* ==========================================================================
   LIGHT MODE (DEFAULT) - Color Tokens from prompt/color_pallet.md
   ========================================================================== */
:root,
[data-theme="light"] {
  --primary-blue: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-active: #1E40AF;
  
  --secondary-light-blue: #60A5FA;
  --secondary-sky-blue: #0284C7;
  --secondary-soft-blue: #DBEAFE;
  --secondary-very-light: #EFF6FF;
  
  --bg-dark: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-input: #FFFFFF;
  --bg-alt: #F1F5F9;
  
  --text-heading: #0F172A;
  --text-body: #334155;
  --text-secondary: #64748B;
  --text-disabled: #94A3B8;
  
  --border-color: #E2E8F0;
  --border-hover: #CBD5E1;
  --border-focus: #2563EB;
  
  --success-color: #16A34A;
  --success-bg: #DCFCE7;
  --success-border: #86EFAC;
  --success-text: #15803D;
  
  --error-color: #DC2626;
  --error-bg: #FEE2E2;
  --error-border: #FCA5A5;
  --error-text: #B91C1C;
  
  --warning-color: #D97706;
  --warning-bg: #FEF3C7;
  
  --info-color: #0284C7;
  --info-bg: #E0F2FE;
  
  --gradient-brand: linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
  --gradient-hero: linear-gradient(135deg, #1D4ED8 0%, #2563EB 50%, #60A5FA 100%);
  --gradient-btn: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
  --gradient-btn-hover: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 24px rgba(15, 23, 42, 0.06);
  
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ==========================================================================
   DARK MODE - Color Tokens from prompt/color_pallet.md
   ========================================================================== */
[data-theme="dark"] {
  --primary-blue: #3B82F6;
  --primary-hover: #2563EB;
  --primary-active: #1D4ED8;
  
  --secondary-light-blue: #60A5FA;
  --secondary-sky-blue: #93C5FD;
  --secondary-soft-blue: rgba(37, 99, 235, 0.2);
  --secondary-very-light: rgba(37, 99, 235, 0.15);
  
  --bg-dark: #0F172A;
  --bg-card: #1E293B;
  --bg-card-hover: #334155;
  --bg-input: #0F172A;
  --bg-alt: #1E293B;
  
  --text-heading: #F8FAFC;
  --text-body: #CBD5E1;
  --text-secondary: #94A3B8;
  --text-disabled: #64748B;
  
  --border-color: #334155;
  --border-hover: #475569;
  --border-focus: #3B82F6;
  
  --success-color: #16A34A;
  --success-bg: rgba(22, 163, 74, 0.15);
  --success-border: rgba(22, 163, 74, 0.4);
  --success-text: #4ADE80;
  
  --error-color: #DC2626;
  --error-bg: rgba(220, 38, 38, 0.15);
  --error-border: rgba(220, 38, 38, 0.4);
  --error-text: #FCA5A5;
  
  --warning-color: #D97706;
  --warning-bg: rgba(217, 119, 6, 0.15);
  
  --info-color: #0284C7;
  --info-bg: rgba(2, 132, 199, 0.15);
  
  --gradient-brand: linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
  --gradient-hero: linear-gradient(135deg, #1D4ED8 0%, #2563EB 50%, #60A5FA 100%);
  --gradient-btn: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
  --gradient-btn-hover: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
  
  --shadow-card: 0 8px 24px rgba(15, 23, 42, 0.3);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-body);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Background Ambient Glow */
body::before {
  content: '';
  position: fixed;
  top: -250px;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  height: 700px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, rgba(96, 165, 250, 0.04) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
  position: relative;
  z-index: 1;
}

/* Header & Navbar */
header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-heading);
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient-brand);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand:hover .brand-icon {
  transform: rotate(8deg) scale(1.1);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-heading);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-body);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.25s ease;
  user-select: none;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

.theme-toggle-btn:hover {
  color: var(--text-heading);
  background-color: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.badge-tag {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.75rem;
  background: var(--secondary-very-light);
  color: var(--primary-blue);
  border: 1px solid var(--secondary-soft-blue);
  border-radius: 30px;
}

.nav-link {
  font-family: var(--font-body);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all 0.25s ease;
}

.nav-link:hover {
  color: var(--text-heading);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateX(-3px);
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 3.5rem;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 2.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-family: var(--font-body);
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto;
}

/* Home Page Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  text-decoration: none;
  color: var(--text-body);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.card:hover {
  transform: translateY(-8px) scale(1.015);
  border-color: var(--border-focus);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
  background-color: var(--bg-card-hover);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}

.category-pill {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--secondary-very-light);
  color: var(--primary-blue);
  border: 1px solid var(--secondary-soft-blue);
  transition: all 0.3s ease;
}

.category-pill.yaml {
  background: rgba(2, 132, 199, 0.1);
  color: var(--info-color);
  border-color: rgba(2, 132, 199, 0.25);
}

.card:hover .category-pill {
  transform: scale(1.05);
}

.card h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  letter-spacing: -0.02em;
  color: var(--text-heading);
}

.card p {
  font-family: var(--font-body);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 1.75rem;
}

.card-footer {
  font-family: var(--font-body);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary-blue);
  transition: color 0.3s ease;
}

.card-footer span:last-child {
  font-size: 1.2rem;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card:hover .card-footer {
  color: var(--primary-hover);
}

.card:hover .card-footer span:last-child {
  transform: translateX(8px);
}

/* ==========================================================================
   TOOL CONTAINER (Solid Card BG with Top Primary Accent Line)
   ========================================================================== */
.tool-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-top: 4px solid var(--primary-blue);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.tool-header-info {
  margin-bottom: 2rem;
}

.tool-header-info h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  letter-spacing: -0.025em;
  color: var(--text-heading);
}

.tool-header-info p {
  font-family: var(--font-body);
  color: var(--text-secondary);
  font-size: 1rem;
}

.input-group {
  margin-bottom: 1.75rem;
}

.input-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.input-header label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-heading);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.action-bar {
  display: flex;
  gap: 0.6rem;
}

.btn-secondary {
  font-family: var(--font-body);
  background: var(--secondary-very-light);
  border: 1px solid var(--secondary-soft-blue);
  color: var(--primary-blue);
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: var(--secondary-soft-blue);
  border-color: var(--primary-blue);
  color: var(--primary-hover);
  transform: translateY(-1px);
}

textarea {
  width: 100%;
  height: 230px;
  padding: 1.1rem;
  background-color: var(--bg-input);
  color: var(--text-heading);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.55;
  resize: vertical;
  transition: all 0.25s ease;
}

textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.btn-primary {
  width: 100%;
  background: var(--primary-blue);
  color: #FFFFFF;
  border: none;
  padding: 1rem 1.75rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px) scale(1.008);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45);
}

.btn-primary:active {
  background: var(--primary-active);
  transform: translateY(0);
}

/* Result Box */
.result-box {
  margin-top: 1.75rem;
  padding: 1.35rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-box.success {
  display: block;
  background-color: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.result-box.error {
  display: block;
  background-color: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
}

/* ==========================================================================
   USAGE INSTRUCTIONS SECTION
   ========================================================================== */
.usage-section {
  margin-top: 3.5rem;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
}

.usage-section h2 {
  font-family: var(--font-heading);
  font-size: 1.55rem;
  font-weight: 800;
  margin-bottom: 1.75rem;
  letter-spacing: -0.02em;
  color: var(--text-heading);
}

.usage-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.step-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 25px rgba(15, 23, 42, 0.08);
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  transition: transform 0.3s ease;
}

.step-card:hover .step-number {
  transform: scale(1.15) rotate(6deg);
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-heading);
}

.step-card p {
  font-family: var(--font-body);
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* ==========================================================================
   BLOG ARTICLE SECTION
   ========================================================================== */
.seo-article {
  margin-top: 3.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.75rem;
  color: var(--text-body);
  box-shadow: var(--shadow-card);
}

.seo-article header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.seo-article h1, .seo-article h2 {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.85rem;
  color: var(--text-heading);
}

.seo-article p {
  font-family: var(--font-body);
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1.35rem;
}

.seo-article h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 2.25rem;
  margin-bottom: 0.85rem;
  color: var(--text-heading);
}

.seo-article ul, .seo-article ol {
  font-family: var(--font-body);
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-body);
}

.seo-article li {
  margin-bottom: 0.6rem;
  line-height: 1.65;
}

.seo-article code {
  background: var(--secondary-very-light);
  color: var(--primary-blue);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  border: 1px solid var(--secondary-soft-blue);
}

pre {
  position: relative;
}

.seo-article pre {
  background: #0F172A;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.3);
  position: relative;
}

.seo-article pre code {
  background: transparent;
  padding: 0;
  color: #F8FAFC;
  border: none;
}

/* Copy Code Button */
.copy-code-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-body);
  color: #94A3B8;
  background: #1E293B;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transform: translateY(-4px) scale(0.95);
  transition: opacity 0.25s ease, transform 0.25s ease, background-color 0.2s ease, border-color 0.2s ease;
  backdrop-filter: blur(8px);
  z-index: 5;
  user-select: none;
}

pre:hover .copy-code-btn {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.copy-code-btn:hover {
  background: #334155;
  color: #F8FAFC;
  border-color: #475569;
}

.copy-code-btn.copied {
  opacity: 1 !important;
  transform: translateY(0) scale(1.05) !important;
  background: #16A34A !important;
  border-color: #15803D !important;
  color: #FFFFFF !important;
  animation: copyPulse 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes copyPulse {
  0% { transform: scale(0.92); }
  50% { transform: scale(1.12); }
  100% { transform: scale(1.05); }
}

.highlight-box {
  background: var(--secondary-very-light);
  border-left: 4px solid var(--primary-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.35rem 1.6rem;
  margin: 1.75rem 0;
  border-top: 1px solid var(--secondary-soft-blue);
  border-right: 1px solid var(--secondary-soft-blue);
  border-bottom: 1px solid var(--secondary-soft-blue);
}

.highlight-box p {
  font-family: var(--font-body);
  margin-bottom: 0;
  color: var(--text-heading);
  font-weight: 500;
}

/* Markdown Table Styling */
.seo-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.92rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.seo-article th,
.seo-article td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  border: 1px solid var(--border-color);
}

.seo-article th {
  font-family: var(--font-heading);
  background-color: var(--bg-alt);
  color: var(--text-heading);
  font-weight: 700;
  border-bottom: 2px solid var(--border-color);
}

.seo-article tr:nth-child(even) {
  background-color: var(--bg-alt);
}

.seo-article tr:hover {
  background-color: var(--secondary-very-light);
}

/* Footer */
footer.site-footer {
  font-family: var(--font-body);
  margin-top: auto;
  padding: 2.5rem 0 1.5rem;
  text-align: center;
  color: var(--text-disabled);
  font-size: 0.88rem;
}

/* Scroll to Top Button */
.scroll-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-blue);
  color: #FFFFFF;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(0.9);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.25s ease, box-shadow 0.25s ease;
  z-index: 99;
}

.scroll-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.scroll-to-top-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-3px) scale(1.08);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.55);
}

.scroll-to-top-btn:active {
  transform: translateY(0) scale(0.98);
}