/* ==========================================================================
   Static Website Toolkit - Modern Design System (Vanilla CSS)
   Typography: Native System Font Stack
   ========================================================================== */

:root {
  /* System Font Stacks */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Light Theme Palette */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-muted: #f1f5f9;
  --bg-code: #0f172a;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;

  /* Brand Accents */
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --accent-border: #bfdbfe;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);

  /* Status & Badge Colors */
  --badge-open-source-bg: #dcfce7;
  --badge-open-source-text: #166534;
  --badge-free-bg: #dcfce7;
  --badge-free-text: #15803d;
  --badge-freemium-bg: #dbeafe;
  --badge-freemium-text: #1e40af;
  --badge-paid-bg: #fef3c7;
  --badge-paid-text: #92400e;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 12px 24px -6px rgba(15, 23, 42, 0.12), 0 4px 8px -2px rgba(15, 23, 42, 0.06);

  /* Borders & Spacing */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --container-max: 1440px;
}

[data-theme="dark"] {
  --bg-body: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1a2234;
  --bg-muted: #1e293b;
  --bg-code: #030712;
  --text-main: #f9fafb;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --border-color: #1f293d;
  --border-focus: #60a5fa;

  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: rgba(59, 130, 246, 0.12);
  --accent-border: rgba(59, 130, 246, 0.3);

  --badge-open-source-bg: rgba(34, 197, 94, 0.15);
  --badge-open-source-text: #4ade80;
  --badge-free-bg: rgba(34, 197, 94, 0.15);
  --badge-free-text: #4ade80;
  --badge-freemium-bg: rgba(59, 130, 246, 0.15);
  --badge-freemium-text: #93c5fd;
  --badge-paid-bg: rgba(245, 158, 11, 0.15);
  --badge-paid-text: #fcd34d;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 12px 24px -6px rgba(0, 0, 0, 0.6);
}

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

html {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-body);
  color: var(--text-main);
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
  max-width: 100%;
  width: 100%;
  position: relative;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease, opacity 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
}

p {
  margin-bottom: 1.25rem;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code:not(pre code) {
  background-color: var(--bg-muted);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-main {
  flex: 1 0 auto;
  padding-bottom: 4rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

[data-theme="dark"] .site-header {
  background-color: rgba(17, 24, 39, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--text-main);
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.brand-icon svg {
  stroke: #ffffff;
  display: block;
}

.brand-badge {
  font-size: 0.75rem;
  background: #FAF9ED;
  color: #2367EA;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  margin-left: 0.25rem;
  border: 1px solid #EAE6B8;
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.nav-drawer {
  display: flex;
  align-items: center;
}

.mobile-menu-tools {
  display: none;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.5rem;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.925rem;
  font-weight: 500;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.nav-link:hover {
  color: var(--accent);
  background-color: var(--accent-light);
}

.nav-link.active {
  color: var(--accent);
  background-color: var(--accent-light);
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Search trigger button in header */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-trigger:hover {
  border-color: var(--border-focus);
  color: var(--text-main);
}

.search-shortcut {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* Theme Toggle Button */
.theme-btn {
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-btn:hover {
  background-color: var(--accent-light);
  border-color: var(--accent-border);
  color: var(--accent);
}

/* Mobile Toggle */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
  padding: 0;
  transition: all 0.15s ease;
}

.mobile-menu-btn:hover, .mobile-menu-btn.active {
  background-color: var(--accent-light);
  border-color: var(--accent-border);
  color: var(--accent);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 4.5rem 0 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent-light);
  border: 1px solid var(--accent-border);
  color: var(--accent);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  max-width: 850px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.25rem;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-muted);
  border-color: var(--border-focus);
}

/* Stats Row */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Section Headers & Cards
   ========================================================================== */
.section {
  padding: 3.5rem 0;
}

.section-header {
  margin-bottom: 2.25rem;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 650px;
}

/* Category Grid */
.category-grid,
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

.category-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-card);
  position: relative;
}

.category-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
}

.category-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.category-card-arrow {
  color: var(--accent);
  font-size: 1.15rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  transition: transform 0.2s ease;
}

.category-card:hover .category-card-arrow {
  transform: translateX(3px);
}

.category-icon {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: var(--radius-md);
  background-color: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.category-card:hover .category-icon {
  background-color: var(--accent);
  color: #ffffff;
}

.feature-icon {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-lg);
  background-color: var(--accent-light);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.category-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background-color: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-full);
}

.category-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.category-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.category-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.category-footer .category-listings,
.category-footer span:last-child {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.8rem;
}

/* ==========================================================================
   Archive Page Layout & Widened Sidebar
   ========================================================================== */
.archive-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 2.75rem;
  align-items: start;
  padding-top: 2rem;
}

.archive-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: sticky;
  top: 5.5rem;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
  padding-right: 0.75rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.archive-sidebar::-webkit-scrollbar {
  width: 5px;
}

.archive-sidebar::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--radius-full);
}

.toc-nav {
  list-style: none;
  border-left: 2px solid var(--border-color);
  padding-left: 0.85rem;
}

.toc-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  line-height: 1.35;
}

.toc-link:hover, .toc-link.active {
  color: var(--accent);
  background-color: var(--accent-light);
  font-weight: 600;
  transform: translateX(4px);
}

/* Mobile Category Pills for quick navigation on small screens */
.mobile-cat-chips {
  display: none;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 0 1rem;
  margin-bottom: 1.5rem;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.mobile-cat-chips::-webkit-scrollbar {
  display: none;
}

.mobile-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  white-space: nowrap;
  text-decoration: none;
  transition: all 0.15s ease;
}

.mobile-chip:hover {
  color: var(--accent);
  border-color: var(--accent);
  background-color: var(--accent-light);
}

.archive-content {
  min-width: 0;
}

/* Archive Controls & View Switcher */
.archive-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.archive-filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.archive-view-switch {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.2rem;
  gap: 0.25rem;
}

.view-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.view-toggle-btn:hover {
  color: var(--text-main);
}

.view-toggle-btn.active {
  background-color: var(--accent);
  color: #ffffff;
}

.archive-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.category-section {
  scroll-margin-top: 5.5rem;
  margin-bottom: 3.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.category-section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.category-post-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-sm);
  margin-top: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

thead {
  background-color: var(--bg-muted);
  border-bottom: 1px solid var(--border-color);
}

th {
  padding: 0.85rem 1rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

td {
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background-color: var(--accent-light);
}

/* Pricing Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge svg {
  flex-shrink: 0;
}

.badge-open-source {
  background-color: var(--badge-open-source-bg);
  color: var(--badge-open-source-text);
}

.badge-free {
  background-color: var(--badge-free-bg);
  color: var(--badge-free-text);
}

.badge-freemium {
  background-color: var(--badge-freemium-bg);
  color: var(--badge-freemium-text);
}

.badge-paid {
  background-color: var(--badge-paid-bg);
  color: var(--badge-paid-text);
}

/* ==========================================================================
   Category Post Page (Editorial / Post-like layout)
   ========================================================================== */
.category-post-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-top: 1.75rem;
  margin-bottom: 1.25rem;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--accent);
}

.category-post-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.category-post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.tool-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.tool-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
}

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

.tool-card-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.tool-card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.tool-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Tool Detail Page & Markdown Content
   ========================================================================== */
.tool-detail-hero {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.tool-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.tool-quote {
  font-size: 1.15rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 1.25rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
}

.tool-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.markdown-body {
  max-width: 820px;
  line-height: 1.7;
}

.markdown-body h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.markdown-body h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.markdown-body ul, .markdown-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

/* Code Blocks & Copy Button */
.code-block-wrapper {
  position: relative;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

pre {
  background-color: var(--bg-code);
  color: #f1f5f9;
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.5;
}

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.3rem 0.65rem;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   Contact Page
   ========================================================================== */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  padding-top: 2rem;
}

.contact-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 1.25rem;
}

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

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   Search Modal
   ========================================================================== */
.search-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 1.5rem 2rem;
}

.search-modal.active {
  display: flex;
}

.search-box {
  width: 100%;
  max-width: 640px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.search-input-wrapper {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-input {
  width: 100%;
  border: none;
  background: none;
  font-size: 1.1rem;
  color: var(--text-main);
  font-family: inherit;
}

.search-input:focus {
  outline: none;
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 0.75rem;
}

.search-result-item {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--text-main);
  transition: background-color 0.15s ease;
}

.search-result-item:hover, .search-result-item.highlighted {
  background-color: var(--accent-light);
}

.search-result-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.search-result-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

/* Pre-Footer Call to Action */
.pre-footer-cta {
  padding: 0 0 3.5rem;
  margin-top: 1rem;
}

.pre-footer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  background-image: radial-gradient(circle at top right, var(--accent-light) 0%, transparent 60%);
}

.pre-footer-content {
  max-width: 600px;
}

.pre-footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
  letter-spacing: 0.02em;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.pre-footer-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  line-height: 1.25;
}

.pre-footer-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 0;
}

.pre-footer-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.15fr 1.15fr;
  gap: 2.75rem;
  margin-bottom: 2.5rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 380px;
  line-height: 1.6;
}

.footer-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  margin-top: 1.15rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.footer-links {
  list-style: none;
  list-style-type: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links li {
  list-style: none;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.footer-links a svg {
  vertical-align: middle;
  opacity: 0.65;
  transition: opacity 0.2s, transform 0.2s;
}

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

.footer-links a:hover svg {
  opacity: 1;
  transform: translate(1px, -1px);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-subtle);
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .archive-layout {
    grid-template-columns: 1fr;
  }
  .archive-sidebar {
    display: none;
  }
  .mobile-cat-chips {
    display: flex;
  }
}

@media (max-width: 860px) {
  .header-actions {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
    margin-left: auto;
  }
  .nav-drawer {
    display: none;
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 1.25rem 1.5rem 1.75rem;
    box-shadow: var(--shadow-lg);
    gap: 1rem;
    z-index: 99;
  }
  .nav-drawer.active {
    display: flex;
    animation: menuSlideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    width: 100%;
    padding: 0;
  }
  .nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    width: 100%;
  }
  .mobile-menu-tools {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    width: 100%;
  }
  .mobile-search-btn {
    width: 100%;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
  }
  .mobile-theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-muted);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
  }
  .mobile-theme-btn:hover {
    background-color: var(--accent-light);
    border-color: var(--accent-border);
    color: var(--accent);
  }
  .contact-container {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
  .pre-footer-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
  }
  .pre-footer-actions {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .pre-footer-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .pre-footer-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .hero {
    padding: 3rem 0 2rem;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .tool-title-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .tool-meta-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .tool-meta-bar div:last-child {
    margin-left: 0;
    width: 100%;
  }
  .tool-meta-bar .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  /* Prevent iOS Safari 115% automatic zoom on form input focus */
  input, select, textarea {
    font-size: 16px !important;
  }
  .site-header {
    padding-top: env(safe-area-inset-top, 0px);
  }
  .hamburger-btn {
    display: inline-flex !important;
  }
  .nav-drawer {
    display: none !important;
  }
}

/* Hamburger Menu Button (Mobile) */
.hamburger-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
  flex-shrink: 0;
}

.hamburger-btn:hover,
.hamburger-btn:focus-visible {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

/* Full-Screen Mobile Navigation Overlay */
.mobile-nav-modal {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: var(--bg-surface);
  z-index: 99999;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px) scale(0.99);
  transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s;
  overflow: hidden;
  box-sizing: border-box;
}

.mobile-nav-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

body.mobile-nav-open {
  overflow: hidden !important;
  touch-action: none !important;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(env(safe-area-inset-top, 0px) + 0.85rem) 1.25rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.mobile-nav-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
  flex-shrink: 0;
}

.mobile-nav-close:hover,
.mobile-nav-close:focus-visible {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
  transform: rotate(90deg);
}

.mobile-nav-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1.25rem 1.25rem calc(env(safe-area-inset-bottom, 0px) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
}

.mobile-nav-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  transition: all 0.18s ease;
  text-decoration: none;
}

.mobile-nav-item a:hover,
.mobile-nav-item a:focus-visible {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateX(4px);
  outline: none;
}

.mobile-nav-item a.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.12);
}

.mobile-nav-link-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.mobile-nav-link-icon {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  color: var(--accent);
  flex-shrink: 0;
}

.mobile-nav-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-subtle);
}

.mobile-nav-item a.active .mobile-nav-badge {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

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

/* ==========================================================================
   Floating Back to Top Button
   ========================================================================== */
.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.05rem;
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.back-to-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.25);
  transform: translateY(-3px);
}

.back-to-top-btn .btt-icon {
  display: flex;
  align-items: center;
  transition: transform 0.2s ease;
}

.back-to-top-btn:hover .btt-icon {
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .back-to-top-btn {
    bottom: 1.25rem;
    right: 1.25rem;
    padding: 0.55rem 0.85rem;
    font-size: 0.8rem;
  }
}

/* Community Channel Cards */
.community-channel-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.community-channel-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent) !important;
  box-shadow: var(--shadow-card-hover);
}