/* ==========================================================================
   TOOLVERSE UNIVERSAL DUAL-THEME STYLING SYSTEM (design.md)
   Tailored for Server Status Diagnostic Workspace
   ========================================================================== */

/* 1. Global Variables & Color Tokens */
:root {
  --bg-main: #F8FAFC;
  --bg-gradient-1: #EEF2FF;
  --bg-gradient-2: #F3E8FF;
  --bg-gradient-3: #E0E7FF;

  --glass-bg: rgba(255, 255, 255, 0.90);
  --glass-bg-subtle: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(226, 232, 240, 0.85);
  --glass-border-subtle: rgba(226, 232, 240, 0.50);

  --accent-indigo: #4F46E5;
  --accent-violet: #7C3AED;
  --accent-purple: #9333EA;
  --accent-cyan: #06B6D4;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #F43F5E;

  --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  --accent-gradient-hover: linear-gradient(135deg, #4338CA 0%, #6D28D9 100%);
  --accent-glow: rgba(79, 70, 229, 0.35);

  --text-primary: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-dim: #94A3B8;

  --input-bg: #FFFFFF;
  --input-border: #E2E8F0;
  --focus-ring: rgba(79, 70, 229, 0.15);

  --card-shadow: 0 10px 30px -5px rgba(79, 70, 229, 0.05), 0 4px 12px -2px rgba(0, 0, 0, 0.02);
  --card-shadow-hover: 0 20px 40px -10px rgba(99, 102, 241, 0.14);

  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* 2. Global Resets & Base Typography */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-body);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Ambient Radial Mesh Background */
.ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 10%, rgba(238, 242, 255, 0.85) 0%, transparent 42%),
    radial-gradient(circle at 80% 25%, rgba(243, 232, 255, 0.75) 0%, transparent 48%),
    radial-gradient(circle at 50% 80%, rgba(224, 231, 255, 0.55) 0%, transparent 52%);
  background-color: var(--bg-main);
  transition: background 0.3s ease;
}

/* Container & Max Width System */
.max-w-7xl {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
  width: 100%;
}

.max-w-5xl {
  max-width: 1024px;
  margin-left: auto;
  margin-right: auto;
}

.max-w-4xl {
  max-width: 896px;
  margin-left: auto;
  margin-right: auto;
}

.max-w-3xl {
  max-width: 768px;
  margin-left: auto;
  margin-right: auto;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.w-full {
  width: 100%;
}

/* 3. Universal Glass Cards & Surfaces */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: var(--card-shadow);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(99, 102, 241, 0.35);
}

.glass-card-subtle {
  background: var(--glass-bg-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border-subtle);
  border-radius: 18px;
}

/* Floating Dark / Light Theme Toggle */
.floating-theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 1000;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.floating-theme-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  color: var(--accent-indigo, #4F46E5);
  border-color: var(--accent-indigo, #4F46E5);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.2);
}

.floating-theme-toggle:active {
  transform: scale(0.96);
}

.floating-theme-toggle .material-symbols-outlined {
  font-size: 1.35rem;
}

.navbar-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-icon-box {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--accent-glow);
  flex-shrink: 0;
}

.brand-icon-box .material-symbols-outlined {
  font-size: 1.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-indigo);
}

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

.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-body);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  background: rgba(241, 245, 249, 0.9);
  color: var(--accent-indigo);
  transform: rotate(15deg);
}

.btn-secondary {
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(241, 245, 249, 0.8);
  border-color: #CBD5E1;
}

.btn-gradient-sm {
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.55rem 1.25rem;
  border-radius: 12px;
  background: var(--accent-gradient);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 4px 14px var(--accent-glow);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-gradient-sm:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--accent-glow);
}

/* Mobile Nav Toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.25rem;
}

/* 5. Tool Hero Header (Block 2) */
.tool-hero-section {
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.15rem;
}

.breadcrumb-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  padding: 0.4rem 1.15rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.breadcrumb-pill a {
  text-decoration: none;
  color: var(--text-muted);
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.breadcrumb-pill a:hover {
  color: var(--accent-indigo);
}

.breadcrumb-sep {
  color: #CBD5E1;
  font-weight: 300;
}

.breadcrumb-active {
  color: var(--accent-indigo);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.live-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }

  70% {
    transform: scale(1);
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }

  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.hero-title-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.15rem;
  flex-wrap: wrap;
}

.hero-icon-box {
  width: 72px;
  height: 72px;
  border-radius: 22px;
  background: var(--accent-gradient);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 28px var(--accent-glow);
  border: 4px solid rgba(238, 242, 255, 0.9);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
  cursor: default;
}

.hero-icon-box .material-symbols-outlined {
  font-size: 2.5rem;
}

.hero-icon-box:hover {
  transform: rotate(6deg) scale(1.05);
  box-shadow: 0 16px 36px rgba(79, 70, 229, 0.45);
}

.hero-h1 {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-body);
  max-width: 680px;
  line-height: 1.65;
  font-weight: 400;
}

/* 6. Primary Workspace Canvas (Block 3) */
.workspace-wrapper {
  margin-top: 1.5rem;
  margin-bottom: 4rem;
}

.workspace-card {
  padding: 2.25rem;
}

/* Search Bar & Input Components */
.search-control-container {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ==========================================================================
   ENTER UP TO 10 URLS TITLE & BOX (Matching Screenshot in Universal Theme)
   ========================================================================== */
.urls-title-header {
  margin-bottom: 0.85rem;
  text-align: left;
}

.urls-box-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 0;
  text-align: left;
}

html.dark .urls-box-title {
  color: #F8FAFC;
}

.urls-title-divider {
  display: none;
}

.search-box-canvas-card {
  width: 100%;
  min-height: 200px;
  background: var(--input-bg);
  border: 1.5px solid var(--input-border);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  position: relative;
}

html.dark .search-box-canvas-card {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.4);
}

.search-box-canvas-card:focus-within {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 4px var(--focus-ring), 0 8px 25px rgba(79, 70, 229, 0.18);
}

/* Search Canvas Body & Textarea */
.search-canvas-body {
  display: flex;
  flex: 1;
  width: 100%;
}

.urls-canvas-textarea {
  width: 100%;
  min-height: 175px;
  padding: 0;
  background: transparent;
  border: none;
  outline: none;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.975rem;
  line-height: 1.75;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

html.dark .urls-canvas-textarea {
  color: #F8FAFC;
}

.urls-canvas-textarea::placeholder {
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  opacity: 0.65;
}

/* Scrollbar */
.urls-canvas-textarea::-webkit-scrollbar {
  width: 6px;
}

.urls-canvas-textarea::-webkit-scrollbar-track {
  background: transparent;
}

.urls-canvas-textarea::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 9999px;
}

.urls-canvas-textarea::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.65);
}

.url-counter-pill {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: 9999px;
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  border: 1px solid rgba(79, 70, 229, 0.2);
  transition: all 0.2s ease;
  user-select: none;
}

html.dark .url-counter-pill {
  background: rgba(99, 102, 241, 0.15);
  color: #A5B4FC;
  border-color: rgba(99, 102, 241, 0.3);
}

.url-counter-pill.badge-full {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.url-counter-pill.badge-warning {
  background: rgba(245, 158, 11, 0.12);
  color: #D97706;
  border-color: rgba(245, 158, 11, 0.35);
}

html.dark .url-counter-pill.badge-warning {
  color: #FBBF24;
}

.clear-all-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 0.25rem 0.65rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.clear-all-link-btn:hover {
  background: rgba(239, 68, 68, 0.08);
  color: var(--accent-rose);
  border-color: rgba(239, 68, 68, 0.25);
}

/* Input Helper Toolbar (Matching Universal Suite) */
.input-helper-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.85rem;
  padding: 0 0.25rem;
}

.badge-url-count {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: 9999px;
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  border: 1px solid rgba(79, 70, 229, 0.2);
  transition: all 0.2s ease;
  user-select: none;
}

html.dark .badge-url-count {
  background: rgba(99, 102, 241, 0.15);
  color: #A5B4FC;
  border-color: rgba(99, 102, 241, 0.3);
}

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

.btn-helper-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: none;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-indigo);
  cursor: pointer;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.btn-helper-link:hover {
  background: rgba(99, 102, 241, 0.08);
}

/* ==========================================================================
   CENTERED ACTION ROW & PILL BUTTON (Underneath the box, matching reference)
   ========================================================================== */
.btn-action-centered-row {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 1.75rem;
}

.btn-pill-cta {
  min-width: 280px;
  height: 56px;
  padding: 0 2.75rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, #6366F1 0%, #7C3AED 100%);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  white-space: nowrap;
  box-shadow: 0 10px 25px -4px rgba(99, 102, 241, 0.45), 0 6px 10px -4px rgba(124, 58, 237, 0.35);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-pill-cta:hover {
  background: linear-gradient(135deg, #4F46E5 0%, #6D28D9 100%);
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -4px rgba(99, 102, 241, 0.55), 0 8px 14px -4px rgba(124, 58, 237, 0.45);
}

.btn-pill-cta:active {
  transform: translateY(0);
}

.btn-pill-cta:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

@media (max-width: 640px) {
  .btn-pill-cta {
    width: 100%;
    min-width: 0;
  }
}

.input-with-icon {
  position: relative;
  flex: 1;
}

.input-icon-prefix {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
  font-size: 1.35rem;
  display: flex;
  align-items: center;
}

.url-input-field {
  width: 100%;
  height: 58px;
  padding: 0 3.25rem 0 3.35rem;
  background: var(--input-bg);
  border: 1.5px solid var(--input-border);
  border-radius: 18px;
  font-size: 1.05rem;
  font-family: var(--font-body);
  color: var(--text-primary);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
}

.url-input-field:focus {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 4px var(--focus-ring);
  outline: none;
}

.input-clear-btn {
  position: absolute;
  right: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  padding: 4px;
  transition: color 0.2s ease;
}

.input-clear-btn:hover {
  color: var(--accent-rose);
}

.btn-action-row {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 1.25rem;
}

.btn-primary-cta {
  height: 58px;
  padding: 0 2rem;
  background: var(--accent-gradient);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  border-radius: 18px;
  box-shadow: 0 6px 20px var(--accent-glow);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  white-space: nowrap;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary-cta:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(79, 70, 229, 0.48);
}

.btn-primary-cta:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Preset Quick Chips */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

.preset-chip {
  background: rgba(241, 245, 249, 0.8);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 0.3rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-chip:hover {
  background: rgba(224, 231, 255, 0.8);
  color: var(--accent-indigo);
  border-color: rgba(79, 70, 229, 0.3);
  transform: translateY(-1px);
}

/* Diagnostic Option Toggles */
.diagnostic-options-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(248, 250, 252, 0.7);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 0.75rem 1.25rem;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.option-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.option-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.option-select {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 10px;
  padding: 0.4rem 0.85rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.option-select:focus {
  border-color: var(--accent-indigo);
}

/* Spinner */
.spinner-icon {
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* Initial Idle Showcase State */
.idle-showcase-state {
  margin-top: 2rem;
  text-align: center;
  padding: 3rem 1.5rem;
  border-radius: 20px;
  background: rgba(248, 250, 252, 0.6);
  border: 1.5px dashed var(--glass-border);
}

.idle-icon-sphere {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem auto;
}

.idle-icon-sphere .material-symbols-outlined {
  font-size: 2.25rem;
}

.idle-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.idle-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* Active Loading State */
.loading-diagnostic-state {
  display: none;
  margin-top: 2rem;
  padding: 3rem 1.5rem;
  text-align: center;
  border-radius: 20px;
  background: rgba(248, 250, 252, 0.8);
  border: 1px solid var(--glass-border);
}

.radar-sweep-container {
  position: relative;
  width: 90px;
  height: 90px;
  margin: 0 auto 1.5rem auto;
  border-radius: 50%;
  border: 2px solid rgba(79, 70, 229, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.radar-sweep-blade {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0deg, transparent 270deg, rgba(79, 70, 229, 0.4) 360deg);
  animation: radar-sweep 1.4s linear infinite;
}

@keyframes radar-sweep {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.loading-steps-list {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.loading-step-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

.loading-step-item.active {
  color: var(--accent-indigo);
}

.loading-step-item.done {
  color: var(--accent-emerald);
}

/* Result Section Matching User Screenshot */
.result-showcase-section {
  margin-top: 2rem;
  animation: fadeIn 0.3s ease;
}

.result-center-heading {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.result-table-card {
  padding: 0;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  box-shadow: var(--card-shadow);
}

.status-result-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.status-result-table thead th {
  padding: 1.1rem 1.25rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--glass-border);
  background: rgba(248, 250, 252, 0.5);
  border-right: 1px solid var(--glass-border);
}

.status-result-table thead th:last-child {
  border-right: none;
}

.status-result-table tbody td {
  padding: 1.15rem 1.25rem;
  font-size: 0.925rem;
  color: var(--text-body);
  border-bottom: 1px solid var(--glass-border);
  border-right: 1px solid var(--glass-border);
  vertical-align: middle;
}

.status-result-table tbody td:last-child {
  border-right: none;
}

.status-result-table tbody tr:last-child td {
  border-bottom: none;
}

.col-sr,
.col-sr-cell {
  width: 10%;
  text-align: center;
  font-weight: 600;
}

.col-urls,
.col-urls-cell {
  width: 50%;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
}

.col-code,
.col-code-cell {
  width: 20%;
  text-align: center;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 1rem;
}

.col-status,
.col-status-cell {
  width: 20%;
  text-align: center;
}

.status-circle-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
}

/* Dark Mode Table Companion */
html.dark .status-result-table thead th {
  background: rgba(15, 23, 42, 0.65);
  border-color: rgba(255, 255, 255, 0.1);
  color: #F8FAFC;
}

html.dark .status-result-table tbody td {
  border-color: rgba(255, 255, 255, 0.08);
  color: #E2E8F0;
}

html.dark .result-table-card {
  background: rgba(19, 26, 46, 0.85);
  border-color: rgba(255, 255, 255, 0.1);
}

/* Result Workspace Output Panel */
.results-output-panel {
  display: none;
  margin-top: 2rem;
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.banner-online {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(5, 150, 105, 0.03) 100%);
  border-color: rgba(16, 185, 129, 0.3);
}

.banner-warning {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(217, 119, 6, 0.03) 100%);
  border-color: rgba(245, 158, 11, 0.3);
}

.banner-offline {
  background: linear-gradient(135deg, rgba(244, 63, 94, 0.08) 0%, rgba(225, 29, 72, 0.03) 100%);
  border-color: rgba(244, 63, 94, 0.3);
}

.status-headline-group {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.status-badge-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  flex-shrink: 0;
}

.badge-online {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  box-shadow: 0 6px 18px rgba(16, 185, 129, 0.35);
}

.badge-warning {
  background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.35);
}

.badge-offline {
  background: linear-gradient(135deg, #F43F5E 0%, #E11D48 100%);
  box-shadow: 0 6px 18px rgba(244, 63, 94, 0.35);
}

.status-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.status-summary-sub {
  font-size: 0.875rem;
  color: var(--text-body);
  margin-top: 0.15rem;
}

.status-meta-pills {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 0.4rem 0.85rem;
  border-radius: 12px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-body);
}

.meta-pill-highlight {
  color: var(--accent-indigo);
  border-color: rgba(79, 70, 229, 0.3);
  background: rgba(238, 242, 255, 0.7);
}

/* 4-KPI Metric Grid */
.kpi-metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.15rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  padding: 1.35rem;
  border-radius: 18px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.85rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.kpi-card:hover {
  transform: translateY(-2px);
  border-color: rgba(79, 70, 229, 0.35);
}

.kpi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kpi-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.kpi-icon-box {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
}

.kpi-icon-box .material-symbols-outlined {
  font-size: 1.1rem;
}

.kpi-main-val {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.kpi-footer-sub {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Speed Bar Indicator */
.speed-bar-track {
  width: 100%;
  height: 6px;
  background: rgba(226, 232, 240, 0.8);
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.35rem;
}

.speed-bar-fill {
  height: 100%;
  border-radius: 9999px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Diagnostic Deep Dive Navigation Tabs */
.deep-dive-container {
  margin-top: 1.5rem;
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  overflow: hidden;
  background: var(--glass-bg);
}

.tabs-navigation-header {
  display: flex;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(248, 250, 252, 0.8);
  overflow-x: auto;
}

.tab-nav-btn {
  padding: 0.95rem 1.35rem;
  border: none;
  background: none;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.tab-nav-btn:hover {
  color: var(--text-primary);
}

.tab-nav-btn.active {
  color: var(--accent-indigo);
  border-bottom-color: var(--accent-indigo);
  background: var(--glass-bg);
}

.tab-content-panel {
  display: none;
  padding: 1.75rem;
}

.tab-content-panel.active {
  display: block;
}

/* Data Tables & Key Value Pairs */
.kv-table {
  width: 100%;
  border-collapse: collapse;
}

.kv-table th,
.kv-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
  font-size: 0.875rem;
}

.kv-table th {
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(248, 250, 252, 0.5);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.kv-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
  width: 32%;
}

.kv-mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-indigo);
}

/* Real-Time Live Ping Tester */
.live-ping-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.ping-chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  height: 120px;
  padding: 1rem;
  background: rgba(248, 250, 252, 0.8);
  border-radius: 14px;
  border: 1px solid var(--glass-border);
}

.ping-bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  height: 100%;
  justify-content: flex-end;
}

.ping-bar-visual {
  width: 100%;
  max-width: 36px;
  background: var(--accent-gradient);
  border-radius: 6px;
  transition: height 0.4s ease;
  min-height: 8px;
}

.ping-bar-val {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Quick Action Bar */
.action-buttons-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.action-btns-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.tool-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tool-action-btn:hover {
  background: rgba(238, 242, 255, 0.8);
  color: var(--accent-indigo);
  border-color: rgba(79, 70, 229, 0.3);
  transform: translateY(-1px);
}

/* Recent Checks History */
.recent-history-section {
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: 18px;
  background: rgba(248, 250, 252, 0.7);
  border: 1px solid var(--glass-border);
}

.recent-history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.recent-history-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.clear-history-btn {
  background: none;
  border: none;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  text-decoration: underline;
}

.clear-history-btn:hover {
  color: var(--accent-rose);
}

.history-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
}

.history-card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  border-radius: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-card-item:hover {
  border-color: var(--accent-indigo);
  transform: translateY(-1px);
}

.history-host-text {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 120px;
}

.history-status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
}

/* 7. Educational Content & SEO Section (Block 4) */
.guide-seo-section {
  margin-top: 2rem;
  margin-bottom: 5rem;
}

.section-h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  text-align: center;
}

.section-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2.5rem auto;
}

/* 3-Step Guide Grid */
.steps-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.step-card {
  padding: 1.85rem;
  border-radius: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.step-card:hover {
  transform: translateY(-3px);
  border-color: rgba(79, 70, 229, 0.3);
}

.step-number-badge {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--accent-gradient);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* 4-Feature Benefit Grid */
.feature-benefit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.feature-box {
  padding: 1.65rem;
  border-radius: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-box:hover {
  transform: translateY(-2px);
  border-color: rgba(79, 70, 229, 0.35);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
}

.feature-box-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.feature-box-desc {
  font-size: 0.85rem;
  color: var(--text-body);
  line-height: 1.55;
}

/* FAQ Accordion */
.faq-accordion-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  background: var(--glass-bg);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item.active {
  border-color: rgba(79, 70, 229, 0.4);
}

.faq-question-btn {
  width: 100%;
  padding: 1.15rem 1.45rem;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-icon-arrow {
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--accent-indigo);
}

.faq-answer-content {
  display: none;
  padding: 0 1.45rem 1.25rem 1.45rem;
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.65;
}

.faq-item.active .faq-answer-content {
  display: block;
}

/* 8. Related Tools Section (Block 5) */
.related-tools-section {
  margin-top: 3.5rem;
  margin-bottom: 5.5rem;
}

.related-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.related-tool-card {
  text-decoration: none;
  padding: 1.6rem 1.5rem;
  border-radius: 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.related-tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.45);
  box-shadow: 0 16px 36px -8px rgba(79, 70, 229, 0.18), 0 4px 14px rgba(0, 0, 0, 0.04);
}

.related-card-top {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.related-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  border: 1px solid rgba(79, 70, 229, 0.18);
  color: var(--accent-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.related-tool-card:hover .related-icon {
  transform: scale(1.08);
  background: var(--accent-gradient);
  border-color: transparent;
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
}

.related-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  transition: color 0.2s ease;
}

.related-tool-card:hover .related-title {
  color: var(--accent-indigo);
}

.related-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
  flex-grow: 1;
}

.related-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--glass-border-subtle);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-indigo);
  margin-top: auto;
  transition: color 0.2s ease;
}

.related-card-footer .arrow-icon {
  font-size: 1.05rem;
  transition: transform 0.25s ease;
}

.related-tool-card:hover .related-card-footer .arrow-icon {
  transform: translateX(4px);
}

/* Master Simple Footer */
#masterFooter {
  margin-top: auto;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--glass-border);
  padding: 1.5rem 1.25rem;
}

.footer-simple-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 320px;
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

.footer-link-item a {
  text-decoration: none;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.footer-link-item a:hover {
  color: var(--accent-indigo);
}

.footer-bottom-bar {
  border-top: 1px solid var(--glass-border);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-badge-pills {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.footer-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 8px;
  background: rgba(241, 245, 249, 0.8);
  color: var(--text-muted);
  border: 1px solid var(--glass-border);
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  background: #0F172A;
  color: #FFFFFF;
  padding: 0.85rem 1.45rem;
  border-radius: 14px;
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast-notification.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   9. UNIVERSAL DARK THEME COMPANION ENFORCER (html.dark)
   ========================================================================== */
html.dark {
  --bg-main: #090C15;
  --glass-bg: rgba(19, 26, 46, 0.78);
  --glass-bg-subtle: rgba(19, 26, 46, 0.55);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-border-subtle: rgba(255, 255, 255, 0.06);

  --text-primary: #F8FAFC;
  --text-body: #CBD5E1;
  --text-muted: #94A3B8;
  --text-dim: #64748B;

  --input-bg: rgba(15, 23, 42, 0.85);
  --input-border: rgba(255, 255, 255, 0.12);
  --focus-ring: rgba(99, 102, 241, 0.35);

  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 20px 40px -10px rgba(99, 102, 241, 0.25);
}

html.dark body {
  background-color: #090C15;
  color: #CBD5E1;
}

html.dark .ambient-bg {
  background:
    radial-gradient(circle at 20% 10%, rgba(99, 102, 241, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 80% 25%, rgba(168, 85, 247, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%);
  background-color: #090C15;
}

html.dark #mainNavbar {
  background: rgba(9, 12, 21, 0.85);
  border-bottom-color: rgba(255, 255, 255, 0.09);
}

html.dark .theme-toggle-btn {
  background: rgba(19, 26, 46, 0.8);
  border-color: rgba(255, 255, 255, 0.1);
  color: #F8FAFC;
}

html.dark .theme-toggle-btn:hover {
  background: rgba(30, 41, 59, 0.9);
}

html.dark .btn-secondary {
  border-color: rgba(255, 255, 255, 0.12);
  color: #F8FAFC;
}

html.dark .btn-secondary:hover {
  background: rgba(30, 41, 59, 0.8);
}

html.dark .breadcrumb-pill {
  background: rgba(15, 23, 42, 0.7);
  border-color: rgba(255, 255, 255, 0.1);
}

html.dark .hero-icon-box {
  border-color: rgba(99, 102, 241, 0.3);
}

html.dark .url-input-field {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(255, 255, 255, 0.12);
  color: #F8FAFC;
}

html.dark .preset-chip {
  background: rgba(30, 41, 59, 0.7);
  border-color: rgba(255, 255, 255, 0.08);
  color: #E2E8F0;
}

html.dark .preset-chip:hover {
  background: rgba(79, 70, 229, 0.25);
  border-color: rgba(99, 102, 241, 0.4);
  color: #FFFFFF;
}

html.dark .diagnostic-options-panel {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .option-select {
  background: rgba(30, 41, 59, 0.8);
  border-color: rgba(255, 255, 255, 0.12);
  color: #F8FAFC;
}

html.dark .idle-showcase-state {
  background: rgba(15, 23, 42, 0.4);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .loading-diagnostic-state {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .tabs-navigation-header {
  background: rgba(15, 23, 42, 0.7);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .kv-table th {
  background: rgba(15, 23, 42, 0.6);
}

html.dark .ping-chart-bars {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .tool-action-btn {
  background: rgba(19, 26, 46, 0.8);
  border-color: rgba(255, 255, 255, 0.1);
  color: #F8FAFC;
}

html.dark .tool-action-btn:hover {
  background: rgba(79, 70, 229, 0.25);
  border-color: rgba(99, 102, 241, 0.4);
}

html.dark .recent-history-section {
  background: rgba(15, 23, 42, 0.5);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .history-card-item {
  background: rgba(19, 26, 46, 0.75);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark #masterFooter {
  background: rgba(9, 12, 21, 0.85);
  border-top-color: rgba(255, 255, 255, 0.09);
}

html.dark .footer-pill {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .related-tool-card {
  background: rgba(19, 26, 46, 0.75);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.45);
}

html.dark .related-tool-card:hover {
  background: rgba(24, 33, 58, 0.88);
  border-color: rgba(99, 102, 241, 0.45);
  box-shadow: 0 16px 36px -8px rgba(79, 70, 229, 0.3);
}

html.dark .related-icon {
  background: rgba(79, 70, 229, 0.16);
  border-color: rgba(99, 102, 241, 0.28);
  color: #A5B4FC;
}

html.dark .related-title {
  color: #F8FAFC;
}

html.dark .related-desc {
  color: #94A3B8;
}

html.dark .related-card-footer {
  border-top-color: rgba(255, 255, 255, 0.06);
  color: #A5B4FC;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .kpi-metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {

  .nav-links,
  .nav-actions .btn-secondary,
  .nav-actions .btn-gradient-sm {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-h1 {
    font-size: 2.15rem;
  }

  .hero-icon-box {
    width: 60px;
    height: 60px;
  }

  .hero-icon-box .material-symbols-outlined {
    font-size: 2rem;
  }

  .workspace-card {
    padding: 1.5rem;
  }

  .input-bar-group {
    flex-direction: column;
  }

  .btn-primary-cta {
    width: 100%;
  }

  .steps-guide-grid {
    grid-template-columns: 1fr;
  }

  .feature-benefit-grid {
    grid-template-columns: 1fr;
  }

  .kpi-metric-grid {
    grid-template-columns: 1fr;
  }

  .related-cards-grid {
    grid-template-columns: 1fr;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
  }

  .main-status-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}