/* Writing System Explorer - Main Stylesheet */

/* ===== Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,500;1,8..60,300;1,8..60,400&family=Space+Grotesk:wght@500;600;700&display=swap');

/* ===== CSS Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --color-bg: #fcfcfc;
  --color-surface: #f5f5f5;
  --color-text: #111111;
  --color-text-muted: #666666;
  --color-border: #e0e0e0;
  --color-accent: #FF6A3D;
  --color-accent-hover: #e85a2f;
  --color-code-bg: #f5f5f5;
  --color-nav-bg: rgba(247, 247, 247, 0.85);
  --color-brand-orange: #FF6A3D;
  --color-trust-canonical: #059669;
  --color-trust-reference: #2563eb;
  --color-trust-draft: #d97706;
  --color-selection-bg: #FF6A3D;
  --color-selection-text: #000000;

  /* Survey theme */
  --color-survey-start: #667eea;
  --color-survey-end: #764ba2;
  --color-survey-bg: #f8f8f8;
  --color-survey-text: #111111;
  --color-survey-text-muted: rgba(0, 0, 0, 0.6);
  --color-survey-surface: rgba(0, 0, 0, 0.04);
  --color-survey-border: rgba(0, 0, 0, 0.12);

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;

  /* Shadows */
  --shadow-card-hover: 0 8px 24px rgba(255, 106, 61, 0.15);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --max-width-content: 65rem;
  --max-width-text: 42rem;
  --nav-height: 3.5rem;
}

/* ===== Dark Mode ===== */
html.dark {
  --color-bg: #0f0f0f;
  --color-surface: #1a1a1a;
  --color-text: #e8e8e8;
  --color-text-muted: #999999;
  --color-border: #2a2a2a;
  --color-accent: #FF6A3D;
  --color-accent-hover: #ff8560;
  --color-code-bg: #1a1a1a;
  --color-nav-bg: rgba(15, 15, 15, 0.85);
  --color-selection-text: #ffffff;
  --shadow-card-hover: 0 8px 24px rgba(255, 106, 61, 0.25);
  --color-survey-bg: #111111;
  --color-survey-text: #e8e8e8;
  --color-survey-text-muted: rgba(255, 255, 255, 0.6);
  --color-survey-surface: rgba(255, 255, 255, 0.06);
  --color-survey-border: rgba(255, 255, 255, 0.12);
}

/* ===== Selection ===== */
::selection {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

::-moz-selection {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

/* ===== Typography ===== */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.3;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--space-md);
}

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

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background-color: var(--color-code-bg);
  padding: var(--space-md);
  border-radius: 0.375rem;
  overflow-x: auto;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-border);
  line-height: 1.5;
}

pre code {
  background-color: transparent;
  padding: 0;
}

ul, ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

li {
  margin-bottom: var(--space-sm);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

/* ===== Layout ===== */
.site-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Navigation ===== */
.top-nav {
  background-color: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 3px solid var(--color-brand-orange);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
}

.top-nav-inner {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-brand-orange);
  border-radius: 50%;
  flex-shrink: 0;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
}

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

.nav-links a {
  font-family: var(--font-display);
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--color-accent);
}

/* Secondary Navigation */
.secondary-nav {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.secondary-nav-inner {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.secondary-nav ul {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  flex-wrap: wrap;
}

.secondary-nav a {
  font-family: var(--font-display);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.secondary-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.secondary-nav a.active {
  color: var(--color-accent);
  font-weight: 500;
}

/* Breadcrumbs */
.breadcrumbs {
  font-family: var(--font-display);
  padding: var(--space-md) 0;
  font-size: 0.875rem;
}

.breadcrumbs-inner {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.breadcrumbs ol {
  display: flex;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
}

.breadcrumbs li:not(:last-child)::after {
  content: "→";
  margin-left: var(--space-sm);
  color: var(--color-text-muted);
}

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

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  width: 100%;
}

.content-text {
  max-width: var(--max-width-text);
  position: relative;
}

.content-text::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

/* ===== File Metadata ===== */
.file-meta {
  background-color: var(--color-nav-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  padding: var(--space-md);
  margin-bottom: var(--space-xl);
  font-size: 0.875rem;
}

.file-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.file-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.file-meta-label {
  font-family: var(--font-display);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.file-meta-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.trust-badge {
  font-family: var(--font-display);
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-weight: 500;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.trust-canonical {
  background-color: rgba(5, 150, 105, 0.1);
  color: var(--color-trust-canonical);
}

.trust-reference {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-trust-reference);
}

.trust-draft {
  background-color: rgba(217, 119, 6, 0.1);
  color: var(--color-trust-draft);
}

/* ===== JSON Display ===== */
.json-container {
  margin: var(--space-lg) 0;
}

.json-formatter-row {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* ===== Collapsible Sections ===== */
.collapsible {
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  margin-bottom: var(--space-md);
}

.collapsible-header {
  padding: var(--space-md);
  background-color: var(--color-nav-bg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 500;
  user-select: none;
}

.collapsible-header:hover {
  background-color: var(--color-code-bg);
}

.collapsible-header:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}


.collapsible-icon {
  transition: transform 0.2s;
}

.collapsible.expanded .collapsible-icon {
  transform: rotate(90deg);
}

.collapsible-content {
  display: none;
  padding: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.collapsible.expanded .collapsible-content {
  display: block;
}

/* ===== Tables ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: 0.9375rem;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-nav-bg);
  font-weight: 600;
  color: var(--color-text);
}

tr:hover {
  background-color: var(--color-nav-bg);
}

/* ===== Cards ===== */
.card {
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  background-color: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

html.dark .card {
  background-color: var(--color-surface);
}

.card-title {
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

/* Card Icon System (knowledge trust-level icons) */
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  transition: background-color var(--transition-fast);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon-canonical {
  background-color: rgba(5, 150, 105, 0.1);
  color: var(--color-trust-canonical);
}

.card:hover .card-icon-canonical {
  background-color: var(--color-trust-canonical);
  color: white;
}

.card-icon-reference {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-trust-reference);
}

.card:hover .card-icon-reference {
  background-color: var(--color-trust-reference);
  color: white;
}

.card-icon-draft {
  background-color: rgba(217, 119, 6, 0.1);
  color: var(--color-trust-draft);
}

.card:hover .card-icon-draft {
  background-color: var(--color-trust-draft);
  color: white;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .main-content {
    padding: var(--space-lg) var(--space-md);
  }

  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .file-meta-grid {
    grid-template-columns: 1fr;
  }

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

  .theme-toggle {
    display: none;
  }
}

@media (max-width: 480px) {
  table {
    font-size: 0.875rem;
  }

  th, td {
    padding: var(--space-sm);
  }
}

/* ===== Utility Classes ===== */
.text-muted {
  color: var(--color-text-muted);
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mb-sm { margin-bottom: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mb-md { margin-bottom: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ===== Dropdown Navigation ===== */
.nav-dropdown {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: none;
  border: none;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.9375rem;
  font-family: var(--font-display);
  line-height: 1.6;
  cursor: pointer;
  padding: 0;
  margin: 0;
  vertical-align: middle;
}

.nav-dropdown-trigger:hover {
  color: var(--color-accent);
}

.nav-dropdown-trigger.active {
  color: var(--color-accent);
}

.nav-dropdown-trigger svg {
  width: 10px;
  height: 10px;
  transition: transform 0.2s;
  flex-shrink: 0;
}

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

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  min-width: 200px;
  padding: var(--space-sm) 0;
  list-style: none;
  margin: var(--space-xs) 0 0 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
  z-index: 200;
}

.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-menu li {
  margin: 0;
}

.nav-dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text);
  font-size: 0.875rem;
  text-decoration: none;
}

.nav-dropdown-menu a:hover {
  background-color: var(--color-nav-bg);
  color: var(--color-accent);
  text-decoration: none;
}

.nav-dropdown-menu a.active {
  color: var(--color-accent);
  background-color: var(--color-code-bg);
}

/* ===== Mobile Menu ===== */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
  color: var(--color-text);
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.mobile-menu-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 280px;
  max-width: 80vw;
  background-color: var(--color-nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
}

.mobile-menu.open {
  transform: translateX(0);
}

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

.mobile-menu-header .nav-brand {
  font-size: 1rem;
}

.mobile-menu-close {
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
  color: var(--color-text);
}

.mobile-menu-close svg {
  width: 24px;
  height: 24px;
}

.mobile-menu-nav {
  padding: var(--space-md) 0;
}

.mobile-menu-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-menu-nav li {
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu-nav a {
  font-family: var(--font-display);
  display: block;
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text);
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
}

.mobile-menu-nav a:hover,
.mobile-menu-nav a.active {
  background: var(--color-nav-bg);
  color: var(--color-accent);
  text-decoration: none;
}

.mobile-menu-section {
  font-family: var(--font-display);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-nav-bg);
}

.mobile-menu-nav .submenu a {
  padding-left: calc(var(--space-lg) + var(--space-md));
  font-size: 0.9375rem;
}

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

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

  .mobile-menu,
  .mobile-menu-overlay {
    display: block;
  }
}

/* ===== Survey Components (Typeform-style) ===== */

/* Full-screen Survey App */
.survey-app {
  position: fixed;
  inset: 0;
  background: var(--color-survey-bg);
  z-index: 1000;
  overflow: hidden;
}

/* Progress Bar - Fixed at top */
.survey-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-survey-border);
  z-index: 1001;
}

.survey-progress-fill {
  height: 100%;
  background: var(--color-accent);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Header - Fixed with step counter */
.survey-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1001;
}

.survey-step-indicator {
  font-family: var(--font-display);
  color: var(--color-survey-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.survey-close-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-survey-surface);
  border: none;
  color: var(--color-survey-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.survey-close-btn:hover {
  background: var(--color-survey-border);
}

.survey-close-btn svg {
  width: 20px;
  height: 20px;
}

/* Question Slides Container */
.survey-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

/* Individual Slide */
.survey-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px var(--space-xl) 120px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(30px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.survey-slide.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.survey-slide.exit-up {
  transform: translateY(-30px);
}

.survey-slide.exit-down {
  transform: translateY(30px);
}

/* Slide Content */
.survey-slide-content {
  width: 100%;
  max-width: 640px;
  color: var(--color-survey-text);
}

.survey-slide[data-slide="complete"] {
  overflow-y: auto;
  align-items: flex-start;
  padding-top: 60px;
  padding-bottom: 60px;
}

.survey-slide[data-slide="complete"] .survey-slide-content {
  max-width: 700px;
}

/* Question Meta (step indicator row) */
.survey-question-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-survey-text-muted);
  margin-bottom: var(--space-md);
}

.survey-step-number {
  font-weight: 600;
  color: var(--color-survey-text);
}

.survey-step-arrow {
  color: var(--color-survey-text-muted);
}

.survey-section-name {
  color: var(--color-survey-text-muted);
}

/* Question Label */
.survey-question-label {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
  color: var(--color-survey-text);
}

/* Inline Navigation (under input field) */
.survey-inline-nav {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.survey-question-hint {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-survey-text-muted);
  margin-bottom: var(--space-xl);
  line-height: 1.5;
}

/* Input Styles - Large and Touch-friendly */
.survey-text-input,
.survey-textarea {
  width: 100%;
  background: var(--color-survey-surface);
  border: 2px solid var(--color-survey-border);
  border-radius: 8px;
  padding: var(--space-lg);
  font-family: inherit;
  font-size: 1.125rem;
  color: var(--color-survey-text);
  transition: border-color 0.2s, background 0.2s;
}

.survey-text-input::placeholder,
.survey-textarea::placeholder {
  color: var(--color-survey-text-muted);
}

.survey-text-input:focus,
.survey-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-survey-surface);
}

.survey-textarea {
  min-height: 140px;
  resize: none;
}

.survey-char-count {
  text-align: right;
  font-size: 0.8125rem;
  color: var(--color-survey-text-muted);
  margin-top: var(--space-sm);
}

.survey-char-count.warning {
  color: #fbbf24;
}

.survey-char-count.over {
  color: #f87171;
}

/* Slider Styles */
.survey-slider-container {
  padding: var(--space-lg) 0;
}

.survey-slider {
  width: 100%;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-survey-border);
  border-radius: 4px;
  cursor: pointer;
}

.survey-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s;
}

.survey-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.survey-slider::-moz-range-thumb {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.survey-slider:focus {
  outline: none;
}

.survey-slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-survey-text-muted);
}

.survey-slider-value {
  text-align: center;
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: var(--space-lg);
}

/* Choice Options (Radio) */
.survey-choice-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.survey-choice-option {
  display: flex;
  align-items: center;
  padding: var(--space-lg);
  background: var(--color-survey-surface);
  border: 2px solid var(--color-survey-border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.survey-choice-option:hover {
  background: var(--color-survey-surface);
  border-color: var(--color-accent);
}

.survey-choice-option.selected {
  background: var(--color-survey-surface);
  border-color: var(--color-accent);
}

.survey-choice-option input {
  display: none;
}

.survey-choice-key {
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-survey-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-survey-text-muted);
  margin-right: var(--space-md);
  flex-shrink: 0;
  transition: all 0.2s;
}

.survey-choice-option.selected .survey-choice-key {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.survey-choice-label {
  flex: 1;
}

.survey-choice-label-text {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-survey-text);
}

.survey-choice-label-desc {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-survey-text-muted);
  margin-top: var(--space-xs);
}

/* Multiselect Options (Checkbox) */
.survey-multiselect-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.survey-multiselect-hint {
  font-size: 0.875rem;
  color: var(--color-survey-text-muted);
  margin-bottom: var(--space-sm);
}

.survey-multiselect-option {
  display: flex;
  align-items: flex-start;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-survey-surface);
  border: 2px solid var(--color-survey-border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.survey-multiselect-option:hover:not(.disabled) {
  background: var(--color-survey-surface);
  border-color: var(--color-accent);
}

.survey-multiselect-option.selected {
  background: var(--color-survey-surface);
  border-color: var(--color-accent);
}

.survey-multiselect-option.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.survey-multiselect-option input {
  display: none;
}

.survey-checkbox-indicator {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-survey-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: var(--space-md);
  margin-top: 2px;
  flex-shrink: 0;
  transition: all 0.2s;
}

.survey-multiselect-option.selected .survey-checkbox-indicator {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.survey-checkbox-indicator svg {
  width: 14px;
  height: 14px;
  color: white;
  opacity: 0;
  transition: opacity 0.2s;
}

.survey-multiselect-option.selected .survey-checkbox-indicator svg {
  opacity: 1;
}

/* Footer - Auto-save indicator */
.survey-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  z-index: 1001;
  pointer-events: none;
}

.survey-nav-btn {
  padding: var(--space-sm) var(--space-lg);
  border-radius: 8px;
  background: var(--color-survey-surface);
  border: none;
  color: var(--color-survey-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.1s;
}

.survey-nav-btn.primary {
  background: var(--color-accent);
  color: white;
}

.survey-nav-btn:hover:not(:disabled) {
  background: var(--color-survey-border);
}

.survey-nav-btn.primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 16px rgba(255, 106, 61, 0.3);
}

.survey-nav-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.survey-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.survey-nav-btn svg {
  width: 18px;
  height: 18px;
}

.survey-submit-btn {
  padding: var(--space-md) var(--space-xl);
  background: var(--color-accent);
  border: none;
  border-radius: 8px;
  color: white;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: transform 0.1s, box-shadow 0.2s;
}

.survey-submit-btn:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 8px 24px rgba(255, 106, 61, 0.3);
}

.survey-submit-btn:active {
  transform: scale(0.98);
}

.survey-submit-btn svg {
  width: 18px;
  height: 18px;
}


/* Welcome Screen */
.survey-welcome {
  text-align: center;
}

.survey-welcome-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-xl);
  background: var(--color-survey-surface);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.survey-welcome-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-accent);
}

.survey-welcome h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-survey-text);
}

.survey-welcome p {
  font-family: var(--font-body);
  font-size: 1.125rem;
  color: var(--color-survey-text-muted);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

.survey-welcome-meta {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
  color: var(--color-survey-text-muted);
  font-size: 0.9375rem;
}

.survey-welcome-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.survey-welcome-meta svg {
  width: 18px;
  height: 18px;
}

.survey-start-btn {
  padding: var(--space-lg) var(--space-2xl);
  background: var(--color-accent);
  border: none;
  border-radius: 8px;
  color: white;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.2s;
}

.survey-start-btn:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 8px 24px rgba(255, 106, 61, 0.3);
}

.survey-start-btn:active {
  transform: scale(0.98);
}

/* Completion Screen */
.survey-complete {
  text-align: center;
  max-height: 100%;
  overflow-y: auto;
}

.survey-complete-header {
  margin-bottom: var(--space-xl);
}

.survey-complete-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  background: var(--color-survey-surface);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: scaleIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes scaleIn {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.survey-complete-icon svg {
  width: 50px;
  height: 50px;
  color: var(--color-accent);
}

.survey-complete h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-survey-text);
}

.survey-complete p {
  font-family: var(--font-body);
  font-size: 1.125rem;
  color: var(--color-survey-text-muted);
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

.survey-complete-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

/* Answers Summary */
.survey-answers-summary {
  text-align: left;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  max-height: 300px;
  overflow-y: auto;
  background: var(--color-survey-surface);
  border-radius: 12px;
  padding: var(--space-md);
}

.survey-answer-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.survey-answer-item:hover {
  background: var(--color-survey-surface);
}

.survey-answer-item + .survey-answer-item {
  border-top: 1px solid var(--color-survey-border);
}

.survey-answer-number {
  width: 28px;
  height: 28px;
  background: var(--color-survey-surface);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  flex-shrink: 0;
}

.survey-answer-content {
  flex: 1;
  min-width: 0;
}

.survey-answer-question {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-survey-text-muted);
  margin-bottom: 4px;
}

.survey-answer-value {
  font-size: 1rem;
  color: var(--color-survey-text);
  word-break: break-word;
}

.survey-answer-value em {
  color: var(--color-survey-text-muted);
  font-style: italic;
}

.survey-action-btn {
  padding: var(--space-md) var(--space-xl);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: transform 0.1s, background 0.2s;
}

.survey-action-btn:active {
  transform: scale(0.98);
}

.survey-action-btn.primary {
  background: var(--color-accent);
  border: none;
  color: white;
}

.survey-action-btn.secondary {
  background: var(--color-survey-surface);
  border: 2px solid var(--color-survey-border);
  color: var(--color-survey-text);
}

.survey-action-btn.secondary:hover {
  background: var(--color-survey-border);
}

.survey-action-btn svg {
  width: 18px;
  height: 18px;
}

/* Auto-save indicator */
.survey-autosave {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-survey-text-muted);
}

.survey-autosave-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ade80;
}

.survey-autosave-dot.saving {
  background: #fbbf24;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Toast notification */
.survey-toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: var(--space-md) var(--space-xl);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  border-radius: 8px;
  font-size: 0.9375rem;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1002;
}

.survey-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .survey-slide {
    padding: 70px var(--space-md) 140px;
  }

  .survey-question-label {
    font-size: 1.375rem;
  }

  .survey-welcome h1,
  .survey-complete h1 {
    font-size: 1.875rem;
  }

  .survey-slider-value {
    font-size: 2.5rem;
  }

  .survey-header {
    padding: var(--space-md);
  }

  .survey-footer {
    padding: var(--space-sm) var(--space-md);
  }

  .survey-inline-nav {
    flex-direction: column;
    width: 100%;
  }

  .survey-inline-nav .survey-nav-btn {
    width: 100%;
    justify-content: center;
  }
}

/* Survey card link styling */
a.card {
  display: block;
  text-decoration: none;
  color: inherit;
}

a.card:hover {
  text-decoration: none;
}

a.card h3 {
  color: var(--color-accent);
}

/* Badge styling */
.badge {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-reference {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-trust-reference);
}

.badge-survey {
  background-color: rgba(217, 119, 6, 0.1);
  color: var(--color-trust-draft);
}

/* ===== Survey Index Page ===== */
.survey-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.survey-card {
  position: relative;
  display: block;
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 12px;
  color: var(--color-text);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  overflow: hidden;
}

.survey-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
  text-decoration: none;
  color: var(--color-text);
}

.survey-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: rgba(255, 106, 61, 0.05);
  border-radius: 50%;
  transform: translate(40px, -40px);
}

.survey-card-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 106, 61, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

.survey-card-icon svg {
  width: 24px;
  height: 24px;
}

.survey-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm) 0;
  color: var(--color-accent);
}

.survey-card p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg) 0;
  line-height: 1.5;
}

.survey-card-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.survey-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.survey-card-meta svg {
  width: 14px;
  height: 14px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.feature-item {
  display: flex;
  gap: var(--space-md);
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-icon svg {
  width: 20px;
  height: 20px;
  color: white;
}

.feature-text h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs) 0;
}

.feature-text p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* Responsive Survey */
@media (max-width: 768px) {
  .survey-slider-labels {
    font-size: 0.875rem;
  }

  .survey-actions {
    flex-direction: column;
  }

  .survey-btn {
    width: 100%;
    justify-content: center;
  }

  .survey-autosave {
    margin-left: 0;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .nav-dropdown-menu {
    position: fixed;
    left: var(--space-md);
    right: var(--space-md);
    width: auto;
    min-width: auto;
  }
}

/* ===== Dark Mode Component Overrides ===== */
html.dark .nav-dropdown-menu {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

html.dark .nav-dropdown-menu a:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

html.dark .nav-dropdown-menu a.active {
  background-color: rgba(255, 255, 255, 0.08);
}

html.dark .collapsible-header {
  background-color: var(--color-surface);
}

html.dark .collapsible-header:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

html.dark .file-meta {
  background-color: var(--color-surface);
}

html.dark th {
  background-color: var(--color-surface);
}

html.dark tr:hover {
  background-color: var(--color-surface);
}

html.dark .mobile-menu-section {
  background-color: var(--color-surface);
}

html.dark .mobile-menu-nav a:hover,
html.dark .mobile-menu-nav a.active {
  background-color: rgba(255, 255, 255, 0.05);
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  padding: 0.375rem;
  cursor: pointer;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun {
  display: none;
}

html.dark .theme-toggle .icon-sun {
  display: block;
}

html.dark .theme-toggle .icon-moon {
  display: none;
}

/* Mobile menu theme toggle */
.mobile-theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  padding: 0.375rem;
  cursor: pointer;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-theme-toggle svg {
  width: 18px;
  height: 18px;
}

.mobile-theme-toggle .icon-sun {
  display: none;
}

html.dark .mobile-theme-toggle .icon-sun {
  display: block;
}

html.dark .mobile-theme-toggle .icon-moon {
  display: none;
}

/* ===== Arrow Link Pattern ===== */
.arrow-link::after {
  content: ' →';
  display: inline-block;
  transition: transform var(--transition-fast);
}

.arrow-link:hover::after {
  transform: translateX(4px);
}

/* ===== Survey Error Screen ===== */
.survey-error-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--color-survey-bg);
  color: var(--color-survey-text);
  text-align: center;
  padding: 2rem;
}

.survey-error-screen a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ===== 404 Page ===== */
.error-page {
  text-align: center;
  padding: 4rem 1rem;
}

.error-page .error-code {
  font-size: 6rem;
  margin: 0;
  color: var(--color-accent);
}

.error-page .error-title {
  margin-top: 1rem;
}

.error-page .error-description {
  margin-top: 2rem;
  font-size: 1.125rem;
}

.error-page .error-actions {
  margin-top: 3rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--color-accent);
  color: white;
  border-radius: 0.375rem;
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: white;
  text-decoration: none;
}

.btn-outline {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 0.375rem;
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: white;
  text-decoration: none;
}

.error-page .popular-links {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
}

.error-page .popular-links li {
  margin-bottom: 0.5rem;
}

.error-page .error-divider {
  margin: 3rem auto;
  max-width: 20rem;
}

/* ===== 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;
  }

  .card:hover {
    transform: none;
  }

  .arrow-link:hover::after {
    transform: none;
  }
}