/* ==========================================================================
   HUZIKIT REGEX TESTER — ULTRA-RESPONSIVE PRODUCTION STYLESHEET
   Mobile-First Architecture & Design System
   Zero Horizontal Overflow at All Breakpoints (320px – 1920px)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Official Huzikit Purple / Indigo Brand Identity */
  --ink: #15132b;
  --ink-soft: #4d4a6b;
  --ink-faint: #8985a8;

  --bg: #fcfbff;
  --bg-soft: #f4f2ff;

  --line: #e7e4f6;
  --line-soft: #f0eefb;

  --primary: #4f46e5;
  --primary-dark: #3b33c4;
  --primary-light: #eeebff;

  --accent: #7c3aed;
  --accent-light: #f3e8ff;

  --white: #ffffff;

  /* Functional Status Colors */
  --success: #10b981;
  --success-dark: #059669;
  --success-light: #ecfdf5;
  --success-border: #a7f3d0;

  --error: #ef4444;
  --error-dark: #dc2626;
  --error-light: #fef2f2;
  --error-border: #fecaca;

  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --warning-border: #fde68a;

  /* Dark UI & Code Viewer Tokens */
  --code-bg: #14112e;
  --code-text: #f3f1fd;
  --code-line: #262153;
  --footer-bg: #0c0a1d;
  --footer-line: #1f1b40;

  /* Typography */
  --font-heading:
    "Lexend", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    monospace;

  /* Elevation Shadows */
  --shadow-xs: 0 1px 2px rgba(21, 19, 43, 0.04);
  --shadow-sm: 0 2px 4px rgba(21, 19, 43, 0.06);
  --shadow-md: 0 4px 12px rgba(21, 19, 43, 0.08);
  --shadow-lg: 0 8px 24px rgba(21, 19, 43, 0.12);
  --shadow-xl: 0 16px 36px rgba(21, 19, 43, 0.16);

  /* Radius Tokens */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 9999px;

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

/* --------------------------------------------------------------------------
   2. Global Reset & Box Sizing
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
/* html,
body {
 
} */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100%;
}

/* Media Elements Must Never Break Viewport */
img,
svg,
video,
canvas,
iframe {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Form Controls Reset */
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

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

/* Accessible Screen Reader Only Utility */
.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;
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--primary);
  color: var(--white);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* --------------------------------------------------------------------------
   3. Responsive Container Architecture
   -------------------------------------------------------------------------- */
.container {
  width: min(100% - 32px, 1200px);
  margin-inline: auto;
  min-width: 0;
  max-width: 100%;
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 24px, 1200px);
  }
}

/* --------------------------------------------------------------------------
   4. Top Announcement / Engine Badge
   -------------------------------------------------------------------------- */
.announcement-banner {
  background-color: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  padding: 8px 0;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

.announcement-content {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.banner-pill {
  display: inline-flex;
  align-items: center;
  background-color: var(--primary);
  color: var(--white);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.banner-text {
  flex: 1 1 200px;
  min-width: 0;
}

/* --------------------------------------------------------------------------
   5. Site Header & Navbar
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background-color: rgba(252, 251, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: all var(--transition-fast);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
  min-width: 0;
}

/* Brand Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.logo-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  background-color: var(--primary-light);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

/* Desktop Navigation (Hidden on small screens) */
.desktop-nav {
  display: none;
}

@media (min-width: 992px) {
  .desktop-nav {
    display: block;
  }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-item {
  position: relative;
}

.dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--ink-soft);
  transition: all var(--transition-fast);
}

.dropdown-trigger:hover,
.dropdown-trigger.active,
.dropdown-trigger[aria-expanded="true"] {
  color: var(--primary);
  background-color: var(--bg-soft);
}

.dropdown-trigger .chevron {
  transition: transform var(--transition-fast);
}

.dropdown-trigger[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.nav-direct-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

.nav-direct-link:hover {
  color: var(--primary);
  background-color: var(--bg-soft);
}

/* Desktop Dropdown Menus */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 12px;
  min-width: 250px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 1000;
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-soft);
}

.dropdown-link:hover,
.dropdown-link.active {
  background-color: var(--bg-soft);
  color: var(--primary);
}

.badge-curr {
  font-size: 0.6875rem;
  font-weight: 600;
  background-color: var(--primary);
  color: var(--white);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* Nav Actions (Search & Mobile Menu Toggle) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-full);
  padding: 7px 14px;
  font-size: 0.875rem;
  color: var(--ink-faint);
  transition: all var(--transition-fast);
}

.btn-search-trigger:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--white);
}

.search-label {
  display: none;
}

@media (min-width: 576px) {
  .search-label {
    display: inline;
  }
}

.search-kbd {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 6px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
}

@media (min-width: 768px) {
  .search-kbd {
    display: inline-block;
  }
}

/* Mobile Hamburger Button */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background-color: var(--white);
  gap: 5px;
  padding: 8px;
}

@media (min-width: 992px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.hamburger-bar {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--ink);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   6. Mobile Navigation Drawer Panel
   -------------------------------------------------------------------------- */
.mobile-nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: flex;
  visibility: hidden;
  opacity: 0;
  transition:
    visibility var(--transition-fast),
    opacity var(--transition-fast);
}

.mobile-nav-drawer.open {
  visibility: visible;
  opacity: 1;
}

.mobile-nav-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(21, 19, 43, 0.45);
  backdrop-filter: blur(4px);
}

.mobile-nav-content {
  position: relative;
  width: min(calc(100% - 32px), 360px);
  height: 100%;
  background-color: var(--white);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
  min-width: 0;
}

.mobile-nav-drawer.open .mobile-nav-content {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

.btn-close-mobile {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  background: var(--bg-soft);
}

.mobile-search-wrapper {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.mobile-search-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--ink-faint);
  text-align: left;
}

.mobile-nav-body {
  padding: 12px 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-accordion {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.mobile-accordion-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--bg);
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
}

.mobile-accordion-btn .chevron {
  transition: transform var(--transition-fast);
}

.mobile-accordion-btn.active .chevron {
  transform: rotate(180deg);
}

.mobile-accordion-content {
  display: none;
  flex-direction: column;
  padding: 6px 8px 10px;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.mobile-accordion-content.active {
  display: flex;
}

.mobile-link {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--ink-soft);
  font-weight: 500;
}

.mobile-link:hover,
.mobile-link.active {
  background: var(--bg-soft);
  color: var(--primary);
  font-weight: 600;
}

.mobile-direct-links {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* --------------------------------------------------------------------------
   7. Global Search Modal Dialog
   -------------------------------------------------------------------------- */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 10002;
  background-color: rgba(21, 19, 43, 0.5);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 16px;
  visibility: hidden;
  opacity: 0;
  transition: all var(--transition-fast);
}

.search-modal-backdrop.open {
  visibility: visible;
  opacity: 1;
}

.search-modal-box {
  width: min(calc(100% - 24px), 580px);
  background-color: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--line);
  margin-top: clamp(20px, 8vh, 80px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 80vh;
  min-width: 0;
}

.search-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}

.search-modal-header .search-icon {
  color: var(--primary);
  flex-shrink: 0;
}

.search-modal-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.0625rem;
  color: var(--ink);
  background: transparent;
  min-width: 0;
}

.search-modal-input::placeholder {
  color: var(--ink-faint);
}

.btn-clear-search {
  padding: 4px;
  color: var(--ink-faint);
}

.btn-close-modal {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-soft);
  color: var(--ink-soft);
  border: 1px solid var(--line);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.search-results-list {
  padding: 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 120px;
  max-height: 50vh;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--ink);
  transition: all var(--transition-fast);
  gap: 12px;
  min-width: 0;
}

.search-result-item:hover,
.search-result-item.selected {
  background-color: var(--bg-soft);
}

.search-item-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.search-item-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.search-item-category {
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.search-item-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--primary-light);
  color: var(--primary);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.search-no-results {
  padding: 32px 16px;
  text-align: center;
  color: var(--ink-faint);
  font-size: 0.9375rem;
}

.search-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  padding: 10px 20px;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  color: var(--ink-faint);
  flex-wrap: wrap;
}

.search-modal-footer kbd {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

/* --------------------------------------------------------------------------
   8. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: clamp(32px, 6vw, 64px) 0 28px;
  background: radial-gradient(
    circle at 50% 0%,
    var(--bg-soft) 0%,
    var(--bg) 80%
  );
  border-bottom: 1px solid var(--line);
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  max-width: 820px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow-xs);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--ink-soft);
  line-height: 1.55;
  max-width: 680px;
}

.hero-presets-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.quick-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-faint);
}

.preset-pill {
  font-size: 0.8125rem;
  font-weight: 600;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-xs);
}

.preset-pill:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--primary-light);
}

/* Hero 3D Pipeline Visual (Strictly Contained, Zero Overflow) */
.hero-visual {
  width: 100%;
  max-width: 820px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin-inline: auto;
  min-width: 0;
}

@media (min-width: 768px) {
  .hero-visual {
    flex-direction: row;
    justify-content: space-between;
    padding: 20px 24px;
  }
}

.pipeline-card {
  flex: 1 1 0;
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 12px 14px;
  text-align: left;
  min-width: 0;
  box-shadow: var(--shadow-xs);
}

.pipeline-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.pipeline-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

.pipeline-tag {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

.pipeline-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
  line-height: 1.4;
}

.pipeline-code .hl {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 1px 4px;
  border-radius: 3px;
}

.pipeline-connector {
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(90deg);
}

@media (min-width: 768px) {
  .pipeline-connector {
    transform: rotate(0deg);
  }
}

/* --------------------------------------------------------------------------
   9. Tool Workspace Section & Tabs Bar
   -------------------------------------------------------------------------- */
.tool-section {
  padding: 32px 0 64px;
}

.tool-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

/* Tool Navigation Tabs Bar (Scrollable on small screens) */
.tool-tabs-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-soft);
  padding: 6px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-soft);
  white-space: nowrap;
  transition: all var(--transition-fast);
  min-height: 40px;
}

.tab-btn:hover {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.6);
}

.tab-btn.active {
  background: var(--white);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.badge-count {
  font-size: 0.6875rem;
  font-weight: 700;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

/* Workspace Card Foundation */
.workspace-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: clamp(16px, 3vw, 24px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  max-width: 100%;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  min-width: 0;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
}

.card-step-num {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: var(--white);
  font-weight: 700;
  font-size: 0.75rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
}

.card-hint {
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

.card-hint code {
  font-family: var(--font-mono);
  background: var(--bg-soft);
  padding: 1px 4px;
  border-radius: 3px;
  color: var(--primary);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-text-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink-soft);
  background: var(--bg-soft);
  transition: all var(--transition-fast);
}

.btn-text-action:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.counter-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-faint);
  background: var(--bg-soft);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   10. Regex Pattern Card & Flags
   -------------------------------------------------------------------------- */
.pattern-input-row {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 6px 14px;
  gap: 8px;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
  min-width: 0;
}

.pattern-input-row:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  background: var(--white);
}

.regex-delimiter {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  user-select: none;
}

.pattern-input-container {
  flex: 1;
  min-width: 0;
}

.pattern-input {
  width: 100%;
  border: none;
  background: transparent;
  outline: none;
  font-family: var(--font-mono);
  font-size: clamp(0.9375rem, 2vw, 1.125rem);
  color: var(--ink);
  font-weight: 500;
}

.active-flags-badge {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--accent);
  user-select: none;
  flex-shrink: 0;
}

/* Regex Error Alert Banner */
.regex-error-alert {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--error-light);
  border: 1px solid var(--error-border);
  border-radius: var(--radius-md);
  color: var(--error-dark);
  font-size: 0.875rem;
  font-weight: 500;
  overflow-wrap: anywhere;
}

/* Flags Row (Mobile-First Wrapping) */
.flags-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 4px;
}

.flags-label {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

.flags-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.flag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
  font-size: 0.8125rem;
  min-height: 34px;
}

.flag-chip input[type="checkbox"] {
  accent-color: var(--primary);
  cursor: pointer;
}

.flag-chip .chip-letter {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
}

.flag-chip .chip-name {
  color: var(--ink-soft);
  display: none;
}

@media (min-width: 576px) {
  .flag-chip .chip-name {
    display: inline;
  }
}

.flag-chip:has(input:checked) {
  background: var(--primary-light);
  border-color: var(--primary);
}

.flag-chip:has(input:checked) .chip-letter {
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   11. Test String Editor with Synchronized Highlighting Backdrop
   -------------------------------------------------------------------------- */
.editor-container {
  position: relative;
  width: 100%;
  min-height: 180px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.editor-container:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Both backdrop and textarea share IDENTICAL typographic and spatial rules */
.editor-backdrop,
.editor-textarea {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  padding: 16px;
  margin: 0;
  border: none;
  outline: none;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  tab-size: 2;
  box-sizing: border-box;
}

.editor-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  color: transparent;
  pointer-events: none;
  overflow: auto;
  z-index: 1;
}

/* Match Highlights in Backdrop */
.editor-backdrop mark.match-hl {
  background-color: #ddd6fe;
  color: transparent;
  border-radius: 3px;
  outline: 1px solid #a78bfa;
}

.editor-backdrop mark.match-hl:nth-of-type(even) {
  background-color: #c7d2fe;
  outline: 1px solid #818cf8;
}

.editor-textarea {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 180px;
  max-height: 480px;
  background: transparent;
  color: var(--ink);
  resize: vertical;
  z-index: 2;
  display: block;
}

/* --------------------------------------------------------------------------
   12. Statistics Dashboard Grid
   -------------------------------------------------------------------------- */
.stats-dashboard {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}

@media (min-width: 576px) {
  .stats-dashboard {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .stats-dashboard {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.stat-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.stat-value.status-ok {
  color: var(--success);
}

.stat-value.status-err {
  color: var(--error);
}

/* --------------------------------------------------------------------------
   13. Match Results Output & Cards
   -------------------------------------------------------------------------- */
.output-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 8px 0;
  min-width: 0;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.toolbar-heading {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
}

.badge-pill {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--primary);
  color: var(--white);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-outline-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-soft);
  transition: all var(--transition-fast);
  min-height: 36px;
}

.btn-outline-sm:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--bg-soft);
}

.btn-primary-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--primary);
  border: 1px solid var(--primary);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--white);
  transition: all var(--transition-fast);
  min-height: 36px;
}

.btn-primary-sm:hover {
  background: var(--primary-dark);
}

/* Matches List Container */
.matches-list-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.match-item-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-xs);
  min-width: 0;
  max-width: 100%;
}

.match-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 0;
}

.match-meta-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.75rem;
}

.match-idx-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.match-range-text {
  color: var(--ink-faint);
  font-family: var(--font-mono);
}

.btn-copy-match {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--ink-soft);
  background: var(--bg-soft);
  transition: all var(--transition-fast);
}

.btn-copy-match:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.match-text-block {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  background: var(--bg-soft);
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* Match Groups Details */
.match-groups-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 4px;
  border-top: 1px dashed var(--line);
}

.group-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  min-width: 0;
}

.group-tag {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

.group-val {
  font-family: var(--font-mono);
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* No Matches State */
.no-matches-box {
  padding: 40px 16px;
  text-align: center;
  background: var(--bg-soft);
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  color: var(--ink-faint);
  font-size: 0.9375rem;
}

/* --------------------------------------------------------------------------
   14. Pattern Explanation Card
   -------------------------------------------------------------------------- */
.explanation-card {
  margin-top: 8px;
}

.explanation-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.token-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  min-width: 0;
}

.token-badge {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.token-desc {
  font-size: 0.875rem;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   15. Mode Panels (Tab Switching)
   -------------------------------------------------------------------------- */
.mode-panel {
  display: none;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.mode-panel.active {
  display: flex;
}

/* --------------------------------------------------------------------------
   16. Replace Mode Styles
   -------------------------------------------------------------------------- */
.replace-input-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
}

.replace-input {
  flex: 1 1 240px;
  padding: 10px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ink);
  min-width: 0;
}

.replace-input:focus {
  border-color: var(--primary);
  outline: none;
  background: var(--white);
}

.diff-comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  min-width: 0;
}

@media (min-width: 768px) {
  .diff-comparison-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.diff-pane {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.diff-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.diff-content {
  min-height: 180px;
  max-height: 360px;
  padding: 14px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  overflow-y: auto;
}

.diff-after {
  background: var(--primary-light);
  border-color: #c7d2fe;
  color: var(--ink);
}

.replace-footer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   17. Split Mode Styles
   -------------------------------------------------------------------------- */
.section-desc {
  font-size: 0.875rem;
  color: var(--ink-soft);
}

.split-results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  min-width: 0;
}

@media (min-width: 576px) {
  .split-results-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .split-results-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.split-item-card {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  min-width: 0;
}

.split-idx-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

.split-val-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* --------------------------------------------------------------------------
   18. Test Cases Suite Styles
   -------------------------------------------------------------------------- */
.testcases-status-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.tc-summary-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink);
}

.tc-progress-track {
  width: 100%;
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}

.tc-progress-fill {
  height: 100%;
  background: var(--success);
  transition: width var(--transition-normal);
}

.testcases-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.testcase-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-xs);
  min-width: 0;
}

.testcase-card.pass {
  border-left: 4px solid var(--success);
}

.testcase-card.fail {
  border-left: 4px solid var(--error);
}

.tc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.tc-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.tc-status-badge.pass {
  background: var(--success-light);
  color: var(--success-dark);
}

.tc-status-badge.fail {
  background: var(--error-light);
  color: var(--error-dark);
}

.tc-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
}

.tc-text-input {
  flex: 1 1 200px;
  padding: 8px 12px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink);
  min-width: 0;
}

.tc-expected-select {
  padding: 8px 12px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-soft);
  flex-shrink: 0;
}

.tc-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --------------------------------------------------------------------------
   19. Presets Grid Styles
   -------------------------------------------------------------------------- */
.search-preset-wrap {
  min-width: 200px;
}

.filter-input-sm {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  background: var(--bg-soft);
}

.preset-disclaimer-box {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--warning-light);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-size: 0.8125rem;
  color: #92400e;
}

.presets-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  min-width: 0;
}

@media (min-width: 768px) {
  .presets-cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.preset-card-item {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition-fast);
  min-width: 0;
}

.preset-card-item:hover {
  border-color: var(--primary);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.preset-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.preset-name {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
}

.preset-code-preview {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--primary);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* --------------------------------------------------------------------------
   20. Cheat Sheet Grid Styles
   -------------------------------------------------------------------------- */
.cheatsheet-sections-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  min-width: 0;
}

@media (min-width: 768px) {
  .cheatsheet-sections-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .cheatsheet-sections-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.cheatsheet-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.cheatsheet-heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

.cheatsheet-table {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cs-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  min-width: 0;
}

.cs-token {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 3px 6px;
  border-radius: 4px;
  color: var(--primary);
  flex-shrink: 0;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cs-token:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.cs-desc {
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   21. Code Generator Styles (Contained Code Viewer, Zero Page Overflow)
   -------------------------------------------------------------------------- */
.lang-selector-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.lang-btn {
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.lang-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

.flavor-notice-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--primary-dark);
}

.code-viewer-container {
  background: var(--code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--code-line);
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 100%;
}

.code-viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid var(--code-line);
  min-width: 0;
}

.code-lang-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: #a5b4fc;
}

.btn-copy-code {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.btn-copy-code:hover {
  background: var(--primary);
}

/* CRITICAL: Scoped internal scrolling inside code block, NO page overflow! */
.code-viewer {
  padding: 16px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--code-text);
  overflow-x: auto;
  max-width: 100%;
  min-width: 0;
  white-space: pre;
}

/* --------------------------------------------------------------------------
   22. Saved Snippets & History Styles
   -------------------------------------------------------------------------- */
.subsection-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.snippets-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  min-width: 0;
}

@media (min-width: 768px) {
  .snippets-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.snippet-card-item {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.history-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
}

.history-pattern-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
  flex: 1 1 200px;
  min-width: 0;
}

/* --------------------------------------------------------------------------
   23. Educational Content Section
   -------------------------------------------------------------------------- */
.educational-section {
  padding: 64px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
}

.edu-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
  min-width: 0;
}

.edu-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  max-width: 780px;
  margin-inline: auto;
}

.edu-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.edu-main-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.edu-intro {
  font-size: 1.0625rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  min-width: 0;
}

@media (min-width: 768px) {
  .edu-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .edu-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.edu-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-xs);
  min-width: 0;
}

.edu-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.35;
}

.edu-card p {
  font-size: 0.9375rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.edu-card ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

.edu-card code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   24. FAQ Accordion Section
   -------------------------------------------------------------------------- */
.faq-section {
  padding: 64px 0;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.faq-container {
  display: flex;
  flex-direction: column;
  gap: 36px;
  max-width: 860px;
  min-width: 0;
}

.faq-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.faq-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 800;
  color: var(--ink);
}

.faq-subtitle {
  font-size: 1rem;
  color: var(--ink-soft);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg);
  transition: border-color var(--transition-fast);
  min-width: 0;
}

.faq-item.active {
  border-color: var(--primary);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  gap: 16px;
  min-width: 0;
}

.faq-chevron {
  color: var(--ink-faint);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  display: none;
  padding: 0 20px 18px;
  font-size: 0.9375rem;
  color: var(--ink-soft);
  line-height: 1.65;
  border-top: 1px solid var(--line-soft);
  min-width: 0;
}

.faq-item.active .faq-answer {
  display: block;
  padding-top: 14px;
}

.faq-answer code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   25. Premium Dark Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--footer-line);
  color: #d1cfe2;
  padding: 64px 0 32px;
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 48px;
  min-width: 0;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  min-width: 0;
}

@media (min-width: 576px) {
  .footer-top-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .footer-top-grid {
    grid-template-columns: 2fr repeat(3, minmax(0, 1fr));
  }
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  text-decoration: none;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.footer-bio {
  font-size: 0.875rem;
  color: #a39fb8;
  line-height: 1.6;
  max-width: 320px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #d1cfe2;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.social-link:hover {
  color: var(--white);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--white);
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  font-size: 0.875rem;
  color: #a39fb8;
  transition: color var(--transition-fast);
}

.footer-links-list a:hover,
.footer-links-list a.active {
  color: var(--white);
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--footer-line);
  font-size: 0.8125rem;
  color: #7d7898;
}

/* --------------------------------------------------------------------------
   26. Toast Notification Component
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10005;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: min(calc(100% - 32px), 360px);
}

.toast-msg {
  background: var(--ink);
  color: var(--white);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
  animation: toastIn 200ms ease forwards;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   27. Responsive Accessibility & Reduced Motion
   -------------------------------------------------------------------------- */
@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;
  }
}