/* IU Hub - Modern Dark Theme with Electric Blue Accents */

:root {
  /* Colors - Dark Intelligence Theme */
  --color-primary: #0066ff;
  --color-primary-bright: #3388ff;
  --color-primary-glow: rgba(0, 102, 255, 0.4);
  --color-primary-subtle: rgba(0, 102, 255, 0.1);

  --color-bg-deep: #0a0e17;
  --color-bg: #0f1419;
  --color-bg-elevated: #161b22;
  --color-bg-card: #1c2128;
  --color-bg-hover: #21262d;

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-bright: rgba(255, 255, 255, 0.15);

  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-muted: #6e7681;

  --color-success: #3fb950;
  --color-warning: #d29922;

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

  /* Typography */
  --font-display: "Outfit", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;

  /* Effects */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-glow: 0 0 40px var(--color-primary-glow);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 8px 32px rgba(0, 0, 0, 0.5);

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

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Animated Background */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  top: -200px;
  right: -100px;
  background: var(--color-primary);
  animation: float 20s ease-in-out infinite;
}

.bg-glow-2 {
  bottom: -200px;
  left: -100px;
  background: #6366f1;
  animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(40px, 20px);
  }
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 1;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.logo-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%,
  100% {
    filter: drop-shadow(0 0 8px var(--color-primary-glow));
  }
  50% {
    filter: drop-shadow(0 0 16px var(--color-primary-glow));
  }
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.logo-subtitle {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* View Toggle - Segmented Control */
.view-toggle {
  position: relative;
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 0;
  padding: var(--space-1);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  position: relative;
  font-family: inherit;
}

.toggle-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
  position: relative;
  z-index: 2;
}

.toggle-option svg {
  opacity: 0.7;
}

.toggle-option[data-view="simple"] {
  color: var(--color-text);
}

.toggle-option[data-view="simple"] svg {
  opacity: 1;
}

body.advanced-view .toggle-option[data-view="simple"] {
  color: var(--color-text-secondary);
}

body.advanced-view .toggle-option[data-view="simple"] svg {
  opacity: 0.7;
}

body.advanced-view .toggle-option[data-view="advanced"] {
  color: var(--color-text);
}

body.advanced-view .toggle-option[data-view="advanced"] svg {
  opacity: 1;
}

.toggle-indicator {
  position: absolute;
  top: var(--space-1);
  left: var(--space-1);
  width: calc(50% - var(--space-1));
  height: calc(100% - var(--space-2));
  background: var(--color-primary);
  border-radius: var(--radius-md);
  transition: transform var(--transition-normal);
  z-index: 1;
  box-shadow: 0 0 20px var(--color-primary-glow);
}

body.advanced-view .toggle-indicator {
  transform: translateX(100%);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Main Content */
.main {
  flex: 1;
  padding: var(--space-8) 0 var(--space-16);
}

/* Categories Grid - Masonry Layout */
.categories-grid {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.masonry-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  min-width: 0;
}

/* Category Card */
.category-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
  position: relative;
}

.category-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, var(--color-primary) 0%, transparent 50%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

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

.category-card:hover::before {
  opacity: 1;
}

/* Staggered animation for cards */
.category-card:nth-child(1) {
  animation-delay: 0.1s;
}
.category-card:nth-child(2) {
  animation-delay: 0.15s;
}
.category-card:nth-child(3) {
  animation-delay: 0.2s;
}
.category-card:nth-child(4) {
  animation-delay: 0.25s;
}
.category-card:nth-child(5) {
  animation-delay: 0.3s;
}
.category-card:nth-child(6) {
  animation-delay: 0.35s;
}
.category-card:nth-child(7) {
  animation-delay: 0.4s;
}

.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5);
  background: linear-gradient(
    135deg,
    var(--color-primary-subtle) 0%,
    transparent 100%
  );
  border-bottom: 1px solid var(--color-border);
}

.category-icon {
  font-size: var(--text-2xl);
  line-height: 1;
}

.category-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.category-items {
  padding: var(--space-3);
}

/* Link Item */
.link-item {
  padding: var(--space-2);
}

.link-main {
  display: flex;
  align-items: center;
}

.link-name {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.link-name::after {
  content: "→";
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition-fast);
}

.link-name:hover {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary-bright);
  box-shadow: 0 0 20px rgba(0, 102, 255, 0.15);
}

.link-name:hover::after {
  opacity: 1;
  transform: translateX(0);
  color: var(--color-primary-bright);
}

/* Advanced Links */
.link-advanced {
  display: none;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding: 0 var(--space-2);
}

body.advanced-view .link-advanced {
  display: flex;
}

.advanced-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.advanced-link:hover {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary-bright);
  box-shadow: 0 0 12px rgba(0, 102, 255, 0.1);
}

.advanced-link-icon {
  font-size: 12px;
}

/* Sub-pages */
.sub-pages {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding: 0 var(--space-2);
}

.sub-page-link {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.sub-page-link:hover {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary-bright);
  box-shadow: 0 0 12px rgba(0, 102, 255, 0.1);
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16);
  color: var(--color-text-secondary);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--space-4);
}

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

.loading[hidden],
.error[hidden] {
  display: none;
}

/* Error State */
.error {
  text-align: center;
  padding: var(--space-16);
  color: var(--color-text-secondary);
}

/* Contact Section */
.contact-section {
  margin-top: var(--space-12);
  padding: var(--space-6);
  text-align: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.contact-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.contact-options {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.contact-item {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

.contact-item strong {
  color: var(--color-primary-bright);
  font-weight: 600;
}

.contact-divider {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Help Section */
.help-section {
  margin-top: var(--space-12);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.help-header {
  padding: var(--space-5) var(--space-6);
  font-weight: 500;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.help-header svg {
  flex-shrink: 0;
}

.help-header span {
  flex: 1;
}

.help-content {
  padding: var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.help-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.help-step {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.help-step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: 50%;
  flex-shrink: 0;
}

.help-step-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.help-step-content strong {
  color: var(--color-text);
  font-weight: 500;
}

.help-step-content span,
.help-step-content a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.help-step-content a {
  color: var(--color-primary-bright);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.help-step-content a:hover {
  color: var(--color-text);
}

.help-example {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.help-example-label {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.help-example pre {
  padding: var(--space-4);
  margin: 0;
  overflow-x: auto;
}

.help-example code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  margin-top: auto;
  position: relative;
  z-index: 1;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.last-updated {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.legacy-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.legacy-link:hover {
  color: var(--color-primary-bright);
}

/* Responsive */
@media (max-width: 900px) {
  .categories-grid {
    flex-direction: column;
  }

  .masonry-column {
    width: 100%;
  }

  .help-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-4);
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .container {
    padding: 0 var(--space-4);
  }
}

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.toggle-btn:focus-visible {
  outline-offset: 4px;
}

.link-name:focus-visible,
.advanced-link:focus-visible,
.sub-page-link:focus-visible {
  outline-offset: -2px;
}

/* Selection styling */
::selection {
  background: var(--color-primary);
  color: var(--color-text);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-bright);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

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

  html {
    scroll-behavior: auto;
  }

  .bg-glow {
    animation: none;
  }

  .logo-icon {
    animation: none;
  }
}