/* Promptixa Help Center Stylesheet - Fully Adaptive, Responsive & System Theme-Aware */

/* ==========================================================================
   Theme Variables & Automatic System Theme Switching
   ========================================================================== */

/* Default / Dark Theme (System Dark Mode) */
:root {
  --font-brand: 'Righteous', cursive, sans-serif;
  --bg-color: #090e1a;
  --card-bg: #111827;
  --card-bg-elevated: #1a2234;
  --card-bg-hover: #1f293d;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: rgba(59, 130, 246, 0.12);
  --accent-border: rgba(59, 130, 246, 0.35);
  --success-color: #10b981;
  --success-light: rgba(16, 185, 129, 0.12);
  --warning-color: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.12);
  --danger-color: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.12);
  --border-color: #1f2937;
  --border-subtle: #2d3748;
  --header-bg: rgba(9, 14, 26, 0.88);
  --category-nav-bg: rgba(9, 14, 26, 0.95);
  --hero-bg: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.16) 0%, rgba(9, 14, 26, 0) 72%);
  --hero-gradient-text: linear-gradient(135deg, #60a5fa 0%, #3b82f6 50%, #93c5fd 100%);
  --notice-bg: linear-gradient(135deg, rgba(30, 41, 59, 0.7) 0%, rgba(17, 24, 39, 0.9) 100%);
  --simulator-bg: linear-gradient(145deg, #111827 0%, #172033 100%);
  --sim-input-focus: #0c1222;
  --sim-preview-mark-bg: rgba(59, 130, 246, 0.25);
  --sim-preview-mark-color: #93c5fd;
  --article-body-bg: #0c1220;
  --callout-info-bg: rgba(59, 130, 246, 0.12);
  --callout-info-color: #bfdbfe;
  --callout-info-border: rgba(59, 130, 246, 0.35);
  --callout-tip-bg: rgba(16, 185, 129, 0.12);
  --callout-tip-color: #a7f3d0;
  --callout-tip-border: rgba(16, 185, 129, 0.3);
  --callout-warning-bg: rgba(245, 158, 11, 0.12);
  --callout-warning-color: #fde68a;
  --callout-warning-border: rgba(245, 158, 11, 0.35);
  --callout-important-bg: rgba(239, 68, 68, 0.1);
  --callout-important-color: #fca5a5;
  --callout-important-border: rgba(239, 68, 68, 0.35);
  --contact-bg: linear-gradient(145deg, #111827 0%, #151e30 100%);
  --footer-bg: #070b14;
  --footer-text: #9ca3af;
  --footer-border: #1f2937;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

/* Polished Light Theme (System Light Mode) */
@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --card-bg-elevated: #f1f5f9;
    --card-bg-hover: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-dim: #64748b;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: rgba(37, 99, 235, 0.08);
    --accent-border: rgba(37, 99, 235, 0.25);
    --success-color: #059669;
    --success-light: rgba(5, 150, 105, 0.08);
    --warning-color: #d97706;
    --warning-light: rgba(217, 119, 6, 0.08);
    --danger-color: #dc2626;
    --danger-light: rgba(220, 38, 38, 0.08);
    --border-color: #e2e8f0;
    --border-subtle: #cbd5e1;
    --header-bg: rgba(255, 255, 255, 0.92);
    --category-nav-bg: rgba(248, 250, 252, 0.95);
    --hero-bg: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.09) 0%, rgba(248, 250, 252, 0) 75%), #ffffff;
    --hero-gradient-text: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #3b82f6 100%);
    --notice-bg: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
    --simulator-bg: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    --sim-input-focus: #ffffff;
    --sim-preview-mark-bg: rgba(37, 99, 235, 0.14);
    --sim-preview-mark-color: #1d4ed8;
    --article-body-bg: #f8fafc;
    --callout-info-bg: #eff6ff;
    --callout-info-color: #1e40af;
    --callout-info-border: #bfdbfe;
    --callout-tip-bg: #f0fdf4;
    --callout-tip-color: #166534;
    --callout-tip-border: #bbf7d0;
    --callout-warning-bg: #fffbeb;
    --callout-warning-color: #92400e;
    --callout-warning-border: #fde68a;
    --callout-important-bg: #fef2f2;
    --callout-important-color: #991b1b;
    --callout-important-border: #fecaca;
    --contact-bg: linear-gradient(145deg, #ffffff 0%, #f1f5f9 100%);
    --footer-bg: #f1f5f9;
    --footer-text: #64748b;
    --footer-border: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    color-scheme: light;
  }
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  width: 100%;
  word-break: break-word;
  overflow-wrap: break-word;
  transition: background-color 0.25s ease, color 0.25s ease;
}

button,
a,
summary,
input,
label,
.topic-card,
.cat-tab-btn,
.quick-tag-btn,
.back-to-top-btn,
.reset-filter-link,
.article-header {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

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

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

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

.header-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: block;
}

.brand-name {
  font-family: var(--font-brand);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text-main);
  white-space: nowrap;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: var(--accent-light);
  color: var(--accent-color);
  padding: 0.18rem 0.45rem;
  border-radius: 9999px;
  border: 1px solid var(--accent-border);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
}

.site-nav a {
  color: var(--text-muted);
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text-main);
  text-decoration: none;
}

.nav-cta-btn {
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main) !important;
  padding: 0.35rem 0.75rem !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

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

/* ==========================================================================
   Main Layout Container
   ========================================================================== */
.help-main {
  flex: 1;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ==========================================================================
   Hero & Search Section
   ========================================================================== */
.help-hero {
  text-align: center;
  padding: 2.25rem 1.25rem 1.75rem;
  background: var(--hero-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.15rem;
  width: 100%;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.75rem;
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text-muted);
}

.hero-pill svg {
  color: var(--accent-color);
  flex-shrink: 0;
}

.help-hero h1 {
  font-size: clamp(1.65rem, 4.5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  max-width: 750px;
  color: var(--text-main);
}

.gradient-text {
  background: var(--hero-gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.help-hero p {
  color: var(--text-muted);
  font-size: clamp(0.9rem, 2vw, 1.025rem);
  max-width: 620px;
  line-height: 1.55;
}

/* Search Box */
.search-wrapper {
  width: 100%;
  max-width: 620px;
  position: relative;
  margin-top: 0.25rem;
}

.search-input-container {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-dim);
  pointer-events: none;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.help-search-input {
  width: 100%;
  padding: 0.9rem 4.5rem 0.9rem 2.75rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 16px; /* 16px prevents iOS Safari auto-zoom */
  font-family: inherit;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.help-search-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25), var(--shadow-lg);
  background-color: var(--card-bg-elevated);
}

.search-controls {
  position: absolute;
  right: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.clear-search-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem;
  border-radius: 4px;
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
}

.clear-search-btn:hover {
  color: var(--text-main);
  background-color: var(--card-bg-elevated);
}

.search-shortcut-badge {
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  user-select: none;
}

/* Quick Search Suggestions */
.quick-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  margin-top: 0.25rem;
  width: 100%;
}

.quick-tag-label {
  font-size: 0.775rem;
  color: var(--text-dim);
  font-weight: 500;
}

.quick-tag-btn {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.3rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.775rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}

.quick-tag-btn:hover {
  border-color: var(--accent-color);
  color: var(--text-main);
  background-color: var(--accent-light);
}

/* Search Results Bar */
.search-results-indicator {
  display: none;
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--accent-border);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-main);
}

.search-results-indicator span strong {
  color: var(--accent-color);
}

.reset-filter-link {
  color: var(--accent-color);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.825rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--accent-light);
  border: 1px solid var(--accent-border);
  font-family: inherit;
  transition: var(--transition);
  text-decoration: none;
}

.reset-filter-link:hover {
  text-decoration: none;
  background-color: var(--accent-border);
  color: #ffffff;
}

/* Clarification Banner */
.notice-card {
  display: flex;
  gap: 0.85rem;
  padding: 1.1rem 1.25rem;
  background: var(--notice-bg);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-color);
  border-radius: var(--radius-md);
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}

.notice-icon {
  flex-shrink: 0;
  color: var(--accent-color);
  margin-top: 0.1rem;
}

.notice-content h4 {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.notice-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Category Filter Tabs
   ========================================================================== */
.category-nav-wrapper {
  position: sticky;
  top: 54px;
  z-index: 90;
  background-color: var(--category-nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-color);
  margin: -1rem 0 0.5rem;
  width: 100%;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.category-tabs {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.category-tabs::-webkit-scrollbar {
  height: 3px;
}

.category-tabs::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 4px;
}

.cat-tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
  font-family: inherit;
  min-height: 36px;
  flex-shrink: 0;
}

.cat-tab-btn:hover {
  background-color: var(--card-bg-elevated);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.cat-tab-btn.active {
  background-color: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

/* ==========================================================================
   Explore by Topic Cards Grid (Responsive & Adaptive)
   ========================================================================== */
.topic-grid-section {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: 100%;
}

.section-title-wrap {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.65rem;
}

.section-title-wrap h2 {
  font-size: clamp(1.15rem, 3vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.85rem;
  width: 100%;
}

.topic-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: var(--transition);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.topic-card:hover,
.topic-card.active {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background-color: var(--card-bg-elevated);
  text-decoration: none;
}

.topic-card.active {
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.35), var(--shadow-md);
}

.topic-card-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.topic-icon-wrap {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-light);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  flex-shrink: 0;
}

.topic-card-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.3;
}

.topic-card p {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.45;
  flex: 1;
}

.topic-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.775rem;
  color: var(--accent-color);
  font-weight: 500;
  padding-top: 0.45rem;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Interactive Variable Simulator
   ========================================================================== */
.simulator-card {
  background: var(--simulator-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  box-shadow: var(--shadow-md);
  width: 100%;
}

.simulator-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.simulator-header h3 {
  font-size: clamp(1.05rem, 2.5vw, 1.2rem);
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.simulator-badge {
  font-size: 0.7rem;
  font-weight: 600;
  background-color: var(--accent-light);
  color: var(--accent-color);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid var(--accent-border);
}

.simulator-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.simulator-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  width: 100%;
}

.sim-input-column,
.sim-preview-column {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

.sim-field-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  width: 100%;
}

.sim-field-group label {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.sim-field-group label code {
  color: var(--accent-color);
  font-weight: 700;
  background: var(--card-bg-elevated);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}

.sim-input {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--text-main);
  font-size: 16px; /* 16px prevents iOS zoom */
  font-family: inherit;
  transition: var(--transition);
  width: 100%;
}

.sim-input:focus {
  outline: none;
  border-color: var(--accent-color);
  background-color: var(--sim-input-focus);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.sim-preview-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.95rem;
  font-size: 0.875rem;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
}

.sim-preview-text {
  word-break: break-word;
}

.sim-preview-text mark {
  background-color: var(--sim-preview-mark-bg);
  color: var(--sim-preview-mark-color);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-weight: 500;
}

.sim-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-color);
}

.sim-btn-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background-color: var(--accent-color);
  color: #ffffff;
  border: none;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  min-height: 38px;
}

.sim-btn-copy:hover {
  background-color: var(--accent-hover);
}

.sim-btn-reset {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.775rem;
  cursor: pointer;
  font-family: inherit;
  padding: 0.35rem;
}

.sim-btn-reset:hover {
  color: var(--text-muted);
}

/* ==========================================================================
   Detailed Knowledge Articles & Accordions
   ========================================================================== */
.articles-section {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  width: 100%;
}

.article-category-block {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  scroll-margin-top: 110px;
  width: 100%;
}

.category-block-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border-color);
}

.category-block-header h2 {
  font-size: clamp(1.15rem, 3vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.category-badge-count {
  font-size: 0.725rem;
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.12rem 0.45rem;
  border-radius: 9999px;
  font-weight: 600;
  white-space: nowrap;
}

/* Accordion Card (Native details/summary with class fallback) */
details.article-accordion,
.article-accordion {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  scroll-margin-top: 120px;
  width: 100%;
  box-shadow: var(--shadow-sm);
}

details.article-accordion:hover,
.article-accordion:hover {
  border-color: var(--border-subtle);
}

details.article-accordion[open],
.article-accordion.open {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-sm);
}

summary.article-header,
.article-header {
  padding: 1rem 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  background-color: var(--card-bg);
  transition: var(--transition);
  gap: 0.75rem;
  min-height: 52px;
  list-style: none;
  touch-action: manipulation;
}

/* Hide default disclosure triangle on summary */
summary.article-header::-webkit-details-marker {
  display: none;
}
summary.article-header::marker {
  display: none;
}

summary.article-header:hover,
.article-header:hover {
  background-color: var(--card-bg-elevated);
}

.article-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex: 1;
  flex-wrap: wrap;
}

.article-topic-tag {
  font-size: 0.675rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
  background-color: var(--card-bg-elevated);
  color: var(--text-dim);
  border: 1px solid var(--border-color);
  white-space: nowrap;
}

.article-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.article-expand-icon {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

details[open] > summary .article-expand-icon,
.article-accordion.open .article-expand-icon {
  transform: rotate(180deg);
  color: var(--accent-color);
}

.article-body {
  padding: 1.15rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--article-body-bg);
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  width: 100%;
}

/* If used as non-details element */
.article-accordion:not(details) > .article-body {
  display: none;
}
.article-accordion.open:not(details) > .article-body {
  display: block;
}

.article-body p {
  margin-bottom: 0.75rem;
}

.article-body p:last-child {
  margin-bottom: 0;
}

.article-body h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0.85rem 0 0.4rem;
}

.article-body ul,
.article-body ol {
  margin: 0.4rem 0 0.85rem 1.15rem;
  color: var(--text-muted);
}

.article-body li {
  margin-bottom: 0.35rem;
}

.article-body strong {
  color: var(--text-main);
}

/* Callout Box inside Articles */
.callout {
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  margin: 0.75rem 0;
  font-size: 0.825rem;
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  line-height: 1.5;
}

.callout-icon {
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.callout.info {
  background-color: var(--callout-info-bg);
  border: 1px solid var(--callout-info-border);
  color: var(--callout-info-color);
}

.callout.info .callout-icon {
  color: var(--accent-color);
}

.callout.tip {
  background-color: var(--callout-tip-bg);
  border: 1px solid var(--callout-tip-border);
  color: var(--callout-tip-color);
}

.callout.tip .callout-icon {
  color: var(--success-color);
}

.callout.warning {
  background-color: var(--callout-warning-bg);
  border: 1px solid var(--callout-warning-border);
  color: var(--callout-warning-color);
}

.callout.warning .callout-icon {
  color: var(--warning-color);
}

.callout.important {
  background-color: var(--callout-important-bg);
  border: 1px solid var(--callout-important-border);
  color: var(--callout-important-color);
}

.callout.important .callout-icon {
  color: var(--danger-color);
}

/* Steps List */
.steps-list {
  list-style: none;
  margin: 0.65rem 0 0.85rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.steps-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-bottom: 0;
}

.step-number {
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--accent-color);
  font-weight: 700;
  font-size: 0.75rem;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* Feature Comparison Table */
.table-responsive {
  overflow-x: auto;
  margin: 0.75rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  -webkit-overflow-scrolling: touch;
  width: 100%;
}

.comparison-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: left;
}

.comparison-table th {
  background-color: var(--card-bg-elevated);
  padding: 0.6rem 0.75rem;
  color: var(--text-main);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
}

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

.badge-yes {
  color: var(--success-color);
  font-weight: 600;
}

.badge-no {
  color: var(--danger-color);
  font-weight: 600;
}

/* ==========================================================================
   Support & Contact Section
   ========================================================================== */
.contact-section {
  background: var(--contact-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
  box-shadow: var(--shadow-sm);
}

.contact-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.contact-header h2 {
  font-size: clamp(1.25rem, 3.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.contact-header p {
  color: var(--text-muted);
  max-width: 550px;
  font-size: 0.875rem;
  line-height: 1.5;
}

.contact-channels-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.contact-channel-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  text-align: center;
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.channel-icon-wrap {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-light);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
}

.contact-channel-card h4 {
  font-size: 0.975rem;
  font-weight: 600;
  color: var(--text-main);
}

.contact-channel-card p {
  font-size: 0.825rem;
  color: var(--text-muted);
  max-width: 440px;
  line-height: 1.45;
}

.channel-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  margin-top: 0.5rem;
  min-height: 40px;
}

.channel-action-btn:hover {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #ffffff;
  text-decoration: none;
}

.support-checklist-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  width: 100%;
}

.support-checklist-box h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.support-checklist-box ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.support-checklist-box li {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
}

.support-checklist-box li svg {
  color: var(--accent-color);
  flex-shrink: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--footer-border);
  padding: 2.25rem 1.25rem 1.75rem;
  background-color: var(--footer-bg);
  color: var(--footer-text);
  font-size: 0.825rem;
  width: 100%;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.footer-container {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.75rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  max-width: 320px;
}

.footer-brand-title {
  font-family: var(--font-brand);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text-main);
}

.footer-brand p {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.footer-nav-groups {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.footer-nav-col {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-nav-col h5 {
  color: var(--text-main);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.footer-nav-col a {
  color: var(--text-muted);
  font-size: 0.825rem;
}

.footer-nav-col a:hover {
  color: var(--text-main);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.15rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.775rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Floating Back to Top Button
   ========================================================================== */
.back-to-top-btn {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--card-bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 99;
}

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

.back-to-top-btn:hover {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ==========================================================================
   Adaptive Media Queries & Breakpoints
   ========================================================================== */

/* Medium Desktops & Laptops (up to 1024px) */
@media (max-width: 1024px) {
  .topic-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.75rem;
  }
  .footer-nav-groups {
    gap: 2rem;
  }
}

/* Tablets & Small Screens (up to 820px) */
@media (max-width: 820px) {
  .header-container {
    padding: 0.75rem 1rem;
  }
  .help-main {
    padding: 1.5rem 1rem 3.5rem;
    gap: 2rem;
  }
  .simulator-body {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile Devices (up to 600px) */
@media (max-width: 600px) {
  .header-container {
    flex-wrap: wrap;
    padding: 0.65rem 0.85rem;
    gap: 0.5rem;
  }
  .brand-name {
    font-size: 1.15rem;
    line-height: 1;
  }
  .site-nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
    gap: 0.4rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .site-nav::-webkit-scrollbar {
    display: none;
  }
  .site-nav a {
    font-size: 0.8rem;
    padding: 0.3rem 0.55rem;
  }
  .help-hero {
    padding: 1.5rem 0.85rem 1.25rem;
    border-radius: var(--radius-md);
  }
  .help-hero p {
    font-size: 0.85rem;
  }
  .help-search-input {
    padding: 0.8rem 2.85rem 0.8rem 2.5rem;
  }
  .search-shortcut-badge {
    display: none;
  }
  .category-nav-wrapper {
    top: 0;
    padding: 0.5rem 0;
    margin: -0.75rem 0 0.25rem;
  }
  .topic-grid {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }
  .topic-card {
    padding: 1rem;
  }
  .simulator-card {
    padding: 1.15rem 0.95rem;
    border-radius: var(--radius-md);
  }
  .sim-btn-copy {
    width: 100%;
  }
  .sim-actions {
    flex-direction: column-reverse;
    align-items: stretch;
  }
  .sim-btn-reset {
    text-align: center;
  }
  .article-header {
    padding: 0.85rem 0.95rem;
  }
  .article-header h3 {
    font-size: 0.875rem;
  }
  .article-body {
    padding: 0.95rem;
    font-size: 0.825rem;
  }
  .footer-nav-groups {
    gap: 1.5rem;
    width: 100%;
    justify-content: space-between;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .back-to-top-btn {
    bottom: 1rem;
    right: 1rem;
    width: 38px;
    height: 38px;
  }
}

/* Very Small Mobile Phones (up to 360px - e.g. Galaxy Fold, iPhone SE 1st gen) */
@media (max-width: 360px) {
  .brand-badge {
    display: none;
  }
  .notice-card {
    padding: 0.85rem;
  }
  .quick-tag-btn {
    font-size: 0.725rem;
    padding: 0.25rem 0.5rem;
  }
  .cat-tab-btn {
    font-size: 0.75rem;
    padding: 0.35rem 0.7rem;
  }
  .footer-nav-groups {
    flex-direction: column;
    gap: 1.25rem;
  }
}