/* ==========================================================================
   FixWikiHub — Main Stylesheet v2.0
   Modern, polished design for a bilingual troubleshooting knowledge base.
   ========================================================================== */

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

/* ==========================================================================
   1. CSS Custom Properties
   ========================================================================== */

:root {
  /* Brand Colors — Rich Teal */
  --color-bg: #FAFBFC;
  --color-surface: #FFFFFF;
  --color-primary: #0D9488;
  --color-primary-hover: #0F766E;
  --color-primary-dark: #134E4A;
  --color-primary-darkest: #042F2E;
  --color-primary-light: #CCFBF1;
  --color-primary-lighter: #F0FDFA;
  --color-primary-light-bg: #F0FDFA;

  /* Text */
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #94A3B8;

  /* Borders */
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  /* Status Colors */
  --color-success: #16A34A;
  --color-success-light: #F0FDF4;
  --color-warning: #D97706;
  --color-warning-light: #FFFBEB;
  --color-error: #DC2626;
  --color-error-light: #FEF2F2;
  --color-info: #2563EB;
  --color-info-light: #EFF6FF;

  /* Accent */
  --color-accent: #F59E0B;

  /* Gray Scale */
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #0F172A;

  /* Alpha variants */
  --color-primary-5: rgba(13, 148, 136, 0.05);
  --color-primary-10: rgba(13, 148, 136, 0.10);
  --color-primary-20: rgba(13, 148, 136, 0.20);

  /* Spacing */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-10: 40px;
  --spacing-12: 48px;
  --spacing-16: 64px;
  --spacing-20: 80px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Liberation Mono', 'Courier New', monospace;

  /* Layout */
  --container-max: 1200px;
  --navbar-height: 64px;

  /* Shadows — Layered for depth */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.10), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  --shadow-primary: 0 4px 14px rgba(13, 148, 136, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}


/* ==========================================================================
   2. Reset & Base
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--navbar-height) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

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

ul,
ol {
  list-style: none;
}

button,
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

p {
  margin-bottom: var(--spacing-4);
}

p:last-child {
  margin-bottom: 0;
}

::selection {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}


/* ==========================================================================
   3. Layout
   ========================================================================== */

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-6);
  padding-right: var(--spacing-6);
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-6); }

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


/* ==========================================================================
   4. Typography Helpers
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }


/* ==========================================================================
   5. Buttons
   ========================================================================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  background: var(--color-primary);
  color: #FFFFFF;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
  transition: all var(--transition-fast);
  white-space: nowrap;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-5);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: transparent;
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  background: var(--color-gray-100);
  color: var(--color-text);
}


/* ==========================================================================
   6. Navbar
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

body.scrolled .navbar {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--spacing-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

.nav-logo:hover {
  color: var(--color-primary-hover);
}

.nav-logo svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  list-style: none;
}

.nav-links > li {
  position: relative;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

/* Dropdown */
.nav-dropdown-trigger {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  margin-top: 2px;
  transition: transform var(--transition-fast);
}

.nav-links > li:hover .nav-dropdown-trigger::after {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -12px;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2);
  list-style: none;
  z-index: 100;
  margin-top: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-links > li:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown li a {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-dropdown li a:hover {
  background: var(--color-primary-lighter);
  color: var(--color-primary);
}

/* Nav Right */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  margin-left: auto;
  flex-shrink: 0;
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
}

.lang-switch button {
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  background: var(--color-gray-100);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  cursor: pointer;
}

.lang-switch button:hover {
  color: var(--color-primary);
  background: var(--color-primary-lighter);
}

.lang-switch button.active {
  background: var(--color-primary);
  color: #FFFFFF;
}

.lang-switch a {
  text-decoration: none;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* Mobile Nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-4) var(--spacing-6);
  z-index: 49;
  max-height: calc(100vh - var(--navbar-height));
  overflow-y: auto;
}

.nav-mobile.open {
  display: block;
  animation: fadeIn 200ms ease;
}

.nav-mobile a {
  display: block;
  padding: var(--spacing-3) 0;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border-light);
}

.nav-mobile a:last-child {
  border-bottom: none;
}

.nav-mobile a:hover {
  color: var(--color-primary);
}


/* ==========================================================================
   7. Hero
   ========================================================================== */

.hero {
  position: relative;
  padding: var(--spacing-20) var(--spacing-6) var(--spacing-16);
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary-dark) 50%, var(--color-primary-darkest) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 30% 20%, rgba(204, 251, 241, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(13, 148, 136, 0.20) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-4);
  color: #FFFFFF;
  line-height: 1.1;
}

.hero p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-8);
  line-height: 1.7;
}

.hero-search {
  display: flex;
  max-width: 576px;
  margin-left: auto;
  margin-right: auto;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.hero-search:focus-within {
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2), 0 0 0 4px rgba(204, 251, 241, 0.15);
}

.hero-search input {
  flex: 1;
  padding: var(--spacing-3) var(--spacing-4);
  border: none;
  outline: none;
  font-size: 1rem;
  color: var(--color-text);
  background: transparent;
  min-width: 0;
}

.hero-search input::placeholder {
  color: var(--color-text-muted);
}

.hero-search button {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: var(--spacing-3) var(--spacing-6);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.hero-search button:hover {
  background: var(--color-primary-hover);
}

.hero-search button svg {
  flex-shrink: 0;
}

.hero-tags {
  display: flex;
  gap: var(--spacing-2);
  justify-content: center;
  margin-top: var(--spacing-6);
  flex-wrap: wrap;
}

.hero-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-full);
  padding: var(--spacing-1) var(--spacing-4);
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.hero-tag:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.4);
  color: #FFFFFF;
}


/* ==========================================================================
   8. Stats Bar
   ========================================================================== */

.stats-bar {
  padding: var(--spacing-10) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-surface);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-6);
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--spacing-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}


/* ==========================================================================
   9. Section
   ========================================================================== */

.section {
  padding-top: var(--spacing-16);
  padding-bottom: var(--spacing-16);
}

.section-header {
  margin-bottom: var(--spacing-10);
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-2);
  max-width: 600px;
}

.section-header.text-center p {
  margin-left: auto;
  margin-right: auto;
}


/* ==========================================================================
   10. Category Grid
   ========================================================================== */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--spacing-5);
}

.category-card {
  display: block;
  padding: var(--spacing-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  color: inherit;
}

.category-card:hover::before {
  transform: scaleX(1);
}

.category-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-lighter);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  color: var(--color-primary);
  transition: all var(--transition-base);
}

.category-card:hover .category-icon {
  background: var(--color-primary);
  color: #FFFFFF;
  transform: scale(1.1);
}

.category-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--spacing-1);
}

.category-card p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}


/* ==========================================================================
   11. Article Cards
   ========================================================================== */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-6);
}

.article-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-base);
}

.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  color: inherit;
}

.article-card-image {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-lighter));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--color-primary);
}

.article-card-body {
  padding: var(--spacing-5);
}

.article-card-body h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--spacing-2);
}

.article-card-body p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tag {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background: var(--color-primary-lighter);
  border-radius: var(--radius-full);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-6);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border-light);
  flex-wrap: wrap;
}

.article-meta-bar .article-tag {
  margin-right: var(--spacing-1);
}


/* ==========================================================================
   12. Tool Pages
   ========================================================================== */

.tool-page {
  padding: var(--spacing-12) 0;
  min-height: calc(100vh - var(--navbar-height) - 300px);
}

.tool-container {
  max-width: 800px;
  margin: 0 auto;
}

.tool-header {
  margin-bottom: var(--spacing-8);
}

.tool-header h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--spacing-2);
}

.tool-description {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.tool-form {
  margin-bottom: var(--spacing-6);
}

.tool-input-group {
  display: flex;
  gap: var(--spacing-3);
}

.tool-input {
  flex: 1;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-width: 0;
}

.tool-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-10);
  outline: none;
}

.tool-input::placeholder {
  color: var(--color-text-muted);
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: 0.9375rem;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  box-shadow: var(--shadow-primary);
}

.tool-button:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.tool-button:active {
  transform: translateY(0);
}

.tool-result {
  min-height: 0;
  transition: opacity var(--transition-fast);
}

/* Tool Loading State */
.tool-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  padding: var(--spacing-8);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tool-loading::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--color-primary-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

/* Tool Error State */
.tool-error {
  padding: var(--spacing-6);
  background: var(--color-error-light);
  border: 1px solid #FECACA;
  border-left: 4px solid var(--color-error);
  border-radius: var(--radius-md);
}

.tool-error p {
  color: var(--color-error);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-3);
  font-weight: 500;
}

/* Tool Empty State */
.tool-empty {
  padding: var(--spacing-8);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

/* Tool Note */
.tool-note {
  margin-top: var(--spacing-8);
  padding: var(--spacing-5);
  background: var(--color-info-light);
  border: 1px solid #BFDBFE;
  border-left: 4px solid var(--color-info);
  border-radius: var(--radius-md);
}

.tool-note p {
  font-size: 0.875rem;
  color: var(--color-gray-700);
  margin-bottom: 0;
  line-height: 1.6;
}

/* DNS Table */
.dns-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.dns-table thead {
  background: var(--color-gray-50);
}

.dns-table th {
  padding: var(--spacing-3) var(--spacing-4);
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.dns-table td {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
  word-break: break-all;
}

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

.dns-table tbody tr:hover {
  background: var(--color-primary-lighter);
}

/* Copy & Retry Buttons */
.btn-copy-results {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-top: var(--spacing-4);
  padding: var(--spacing-2) var(--spacing-5);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-lighter);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-results:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

.btn-retry {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-5);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-error);
  background: #FFFFFF;
  border: 1px solid #FECACA;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-retry:hover {
  background: var(--color-error);
  color: #FFFFFF;
  border-color: var(--color-error);
}

/* SSL Results */
.ssl-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.ssl-summary.green { border-left: 4px solid var(--color-success); }
.ssl-summary.yellow { border-left: 4px solid var(--color-warning); }
.ssl-summary.red { border-left: 4px solid var(--color-error); }

.ssl-field {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-5);
  border-bottom: 1px solid var(--color-border-light);
}

.ssl-field:last-child {
  border-bottom: none;
}

.ssl-field .result-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.ssl-field .result-value {
  font-size: 0.9375rem;
  color: var(--color-text);
  text-align: right;
  word-break: break-all;
}

/* HTTP Results */
.http-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-6);
}

.http-code {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-2);
}

.http-code.green { color: var(--color-success); }
.http-code.yellow { color: var(--color-warning); }
.http-code.red { color: var(--color-error); }
.http-code.grey { color: var(--color-text-muted); }

.http-field {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-4);
  padding: var(--spacing-3) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.http-field:last-child {
  border-bottom: none;
}

.http-field .result-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.http-field .result-value {
  font-size: 0.9375rem;
  color: var(--color-text);
  text-align: right;
  word-break: break-all;
}

.result-value.link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.result-value.link:hover {
  color: var(--color-primary-hover);
}

.http-explanation {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.http-explanation.green { color: var(--color-success); }
.http-explanation.yellow { color: var(--color-warning); }
.http-explanation.red { color: var(--color-error); }
.http-explanation.grey { color: var(--color-text-muted); }

/* WHOIS Results */
.whois-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.whois-field {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-5);
  border-bottom: 1px solid var(--color-border-light);
}

.whois-field:last-child {
  border-bottom: none;
}

.whois-field .result-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.whois-field .result-value {
  font-size: 0.9375rem;
  color: var(--color-text);
  text-align: right;
  word-break: break-all;
}

/* Generic Result Rows (legacy) */
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-border-light);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.result-value {
  font-size: 0.875rem;
  color: var(--color-text);
  font-weight: 500;
}

.result-status {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px var(--spacing-2);
  border-radius: var(--radius-sm);
}

.status-ok { color: var(--color-success); background: var(--color-success-light); }
.status-warn { color: var(--color-warning); background: var(--color-warning-light); }
.status-error { color: var(--color-error); background: var(--color-error-light); }

/* Color Coding Classes */
.green { color: var(--color-success); }
.yellow { color: var(--color-warning); }
.red { color: var(--color-error); }
.grey { color: var(--color-text-muted); }

.days-green { color: var(--color-success); font-weight: 700; }
.days-yellow { color: var(--color-warning); font-weight: 700; }
.days-red { color: var(--color-error); font-weight: 700; }

/* Search Messages */
.search-msg {
  display: block;
  margin-top: var(--spacing-2);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.search-msg.error {
  color: var(--color-error);
}

.search-no-results {
  padding: var(--spacing-12);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.search-highlight {
  background: #FEF3C7;
  color: var(--color-text);
  padding: 1px 3px;
  border-radius: 3px;
}


/* ==========================================================================
   13. Article Content
   ========================================================================== */

.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--spacing-12) 0;
}

.article-content h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-4);
  line-height: 1.2;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--spacing-10);
  margin-bottom: var(--spacing-4);
  padding-bottom: var(--spacing-2);
  border-bottom: 2px solid var(--color-primary-light);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: var(--spacing-8);
  margin-bottom: var(--spacing-3);
}

.article-content p {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-4);
}

.article-content ul,
.article-content ol {
  list-style: disc;
  margin-bottom: var(--spacing-4);
  padding-left: var(--spacing-6);
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-2);
}

.article-content strong {
  font-weight: 700;
  color: var(--color-text);
}

/* Inline code */
.article-content code,
:not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--color-primary-lighter);
  color: var(--color-primary-dark);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* Code blocks */
.article-content pre {
  background: #1E293B;
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  overflow-x: auto;
  margin-bottom: var(--spacing-5);
  border: 1px solid #334155;
}

.article-content pre code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: #E2E8F0;
  background: none;
  padding: 0;
  border-radius: 0;
  font-weight: 400;
}


/* ==========================================================================
   14. Triage Section
   ========================================================================== */

.triage-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-6);
}

.triage-step {
  text-align: center;
  padding: var(--spacing-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.triage-step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.triage-num {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-4);
  font-size: 1.125rem;
  font-weight: 800;
  color: #FFFFFF;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-primary);
}

.triage-step h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--spacing-2);
}

.triage-step p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}


/* ==========================================================================
   15. Footer
   ========================================================================== */

.footer {
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-primary-darkest) 100%);
  color: #CBD5E1;
  padding: var(--spacing-12) 0 var(--spacing-6);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.footer h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FFFFFF;
  margin-bottom: var(--spacing-3);
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  margin-bottom: 0;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem;
  color: var(--color-gray-400);
}


/* ==========================================================================
   16. Ad Slots
   ========================================================================== */

.ad-slot {
  margin: var(--spacing-6) auto;
  max-width: 728px;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-50);
  border: 1px dashed var(--color-gray-300);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

.ad-placeholder {
  padding: var(--spacing-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}


/* ==========================================================================
   17. Animations
   ========================================================================== */

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

@keyframes spin {
  to { transform: rotate(360deg); }
}

.fade-in {
  animation: fadeIn 0.4s ease;
}


/* ==========================================================================
   18. Responsive
   ========================================================================== */

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-6);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-4);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-right .lang-switch,
  .nav-right .btn-outline {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    padding: var(--spacing-12) var(--spacing-6) var(--spacing-10);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-search {
    flex-direction: column;
    border-radius: var(--radius-md);
  }

  .hero-search input {
    padding: var(--spacing-3);
  }

  .hero-search button {
    padding: var(--spacing-3);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  }

  .hero-search:focus-within {
    flex-direction: column;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .section {
    padding-top: var(--spacing-10);
    padding-bottom: var(--spacing-10);
  }

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

  .tool-button {
    width: 100%;
  }

  .article-content {
    padding: var(--spacing-6) 0;
  }

  .article-content h1 {
    font-size: 1.75rem;
  }

  .article-content pre {
    padding: var(--spacing-3);
    font-size: 0.8125rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
  }

  .hero h1 {
    font-size: 1.625rem;
  }

  .hero-tag {
    font-size: 0.75rem;
    padding: var(--spacing-1) var(--spacing-3);
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .http-code {
    font-size: 2.25rem;
  }

  .ssl-field,
  .http-field,
  .whois-field {
    flex-direction: column;
    gap: var(--spacing-1);
  }

  .ssl-field .result-value,
  .http-field .result-value,
  .whois-field .result-value {
    text-align: left;
  }
}


/* ==========================================================================
   19. Print Styles
   ========================================================================== */

@media print {
  .navbar,
  .nav-mobile,
  .mobile-toggle,
  .hero-search,
  .hero-tags,
  .ad-slot,
  .footer {
    display: none !important;
  }

  .hero {
    background: none;
    color: var(--color-text);
    padding: var(--spacing-4) 0;
  }

  .hero h1,
  .hero p {
    color: var(--color-text);
  }

  .article-content pre {
    border: 1px solid #ccc;
    background: #f5f5f5;
    color: #333;
  }

  .article-content pre code {
    color: #333;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }
}


/* ==========================================================================
   20. Accessibility
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Cookie Consent Banner (GDPR / AdSense)
   ========================================================================== */

.cookie-consent {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--color-gray-900);
  color: #F1F5F9;
  font-size: 0.875rem;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.18);
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.cookie-consent.show {
  transform: translateY(0);
  opacity: 1;
}

.cookie-consent-text {
  flex: 1;
  line-height: 1.5;
}

.cookie-consent-link {
  color: var(--color-primary-light);
  text-decoration: underline;
  margin-left: 0.25rem;
}

.cookie-consent-link:hover {
  color: #5EEAD4;
}

.cookie-consent-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.cookie-btn {
  padding: 0.5rem 1.25rem;
  border: none;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.cookie-btn-accept {
  background: var(--color-primary);
  color: #FFFFFF;
}

.cookie-btn-accept:hover {
  background: var(--color-primary-hover);
}

.cookie-btn-decline {
  background: transparent;
  color: var(--color-gray-400);
  border: 1px solid var(--color-gray-700);
}

.cookie-btn-decline:hover {
  color: #F1F5F9;
  border-color: var(--color-gray-500);
}

@media (max-width: 640px) {
  .cookie-consent {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
    padding: 1rem;
  }

  .cookie-consent-actions {
    width: 100%;
    justify-content: center;
  }
}

/* ==========================================================================
   Breadcrumb Visual Navigation
   ========================================================================== */

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.breadcrumbs-separator {
  color: var(--color-gray-300);
  user-select: none;
}

.breadcrumbs-current {
  color: var(--color-text);
  font-weight: 500;
}

/* ==========================================================================
   Tool Page Content Sections (SEO enrichment)
   ========================================================================== */

.tool-page .tool-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1rem;
}

.tool-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem;
}

.tool-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--color-gray-900);
}

.tool-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--color-gray-800);
}

/* ========== Table of Contents ========== */
.toc {
  background: var(--color-gray-50, #f8fafc);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.toc details summary {
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-gray-900, #1e293b);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc details summary::before {
  content: '\25BC';
  font-size: 0.625rem;
  transition: transform 0.2s;
}

.toc details[open] summary::before {
  transform: rotate(0deg);
}

.toc details summary::-webkit-details-marker {
  display: none;
}

.toc ol {
  margin: 0.75rem 0 0;
  padding-left: 1.5rem;
  list-style: decimal;
}

.toc ol li {
  margin-bottom: 0.375rem;
  font-size: 0.9375rem;
}

.toc ol li a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s;
}

.toc ol li a:hover {
  text-decoration: underline;
  color: var(--color-primary-dark, #0f4c5c);
}

.tool-content p {
  line-height: 1.7;
  color: var(--color-gray-700);
  margin-bottom: 1rem;
}

.tool-content ul,
.tool-content ol {
  margin: 0 0 1.5rem 1.5rem;
}

.tool-content ul li,
.tool-content ol li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
  color: var(--color-gray-700);
}

.tool-content strong {
  color: var(--color-gray-900);
}

.tool-content code {
  background: var(--color-gray-100);
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.875em;
  color: var(--color-primary);
}

/* FAQ Accordion (native details/summary) */

.faq-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.faq-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.faq-item:hover {
  border-color: var(--color-primary-light);
}

.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.08);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-gray-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: color 0.2s;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: '\2212';
  transform: rotate(0deg);
}

.faq-item summary:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  line-height: 1.7;
  color: var(--color-gray-700);
}

.faq-answer p {
  margin-bottom: 0.75rem;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Info Grid for DNS types / HTTP codes / etc */

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  transition: border-color  0.2s, box-shadow 0.2s;
}

.info-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.info-card h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.info-card p {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-gray-600);
  margin: 0;
}

/* Related Guides on tool pages */

.related-guides {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.related-guides h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.related-guides .guide-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.related-guide-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.15s;
}

.related-guide-item:hover {
  border-color: var(--color-primary);
  transform: translateX(2px);
}

.related-guide-item .guide-badge {
  flex-shrink: 0;
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.related-guide-item .guide-info {
  flex: 1;
}

.related-guide-item .guide-info h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: 0.125rem;
}

.related-guide-item .guide-info span {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Tool page ad slot */

.tool-ad-slot {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
}

/* ==========================================================================
   Quick Reference Table (article pages)
   ========================================================================== */

.quick-reference-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.quick-reference-table thead {
  background: var(--color-primary);
  color: #FFFFFF;
}

.quick-reference-table thead th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
}

.quick-reference-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background 0.15s;
}

.quick-reference-table tbody tr:nth-child(even) {
  background: var(--color-surface);
}

.quick-reference-table tbody tr:hover {
  background: var(--color-primary-light);
}

.quick-reference-table tbody td {
  padding: 0.75rem 1rem;
  color: var(--color-gray-700);
  line-height: 1.5;
}

.quick-reference-table tbody td:first-child {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.8125rem;
  color: var(--color-gray-800);
}