:root {
  color-scheme: dark;
  --bg: #0b0f1a;
  --panel: #141a2b;
  --panel-alt: #111625;
  --card: #1a2035;
  --text: #e2e8ff;
  --muted: #9aa3c7;
  --accent: #7c8cff;
  --accent-strong: #9aa6ff;
  --success: #2dd4bf;
  --danger: #f97316;
  --warning: #facc15;
  --border: #232b44;
  --focus: #f0f5ff;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
}

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

body {
  background: radial-gradient(circle at top, #1b2340 0%, var(--bg) 45%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--accent);
  color: #0b0f1a;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  z-index: 20;
}

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

a:hover {
  color: var(--accent-strong);
}

header {
  background: rgba(11, 15, 26, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 5vw;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand .logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fdf5ff 0%, #b7c0ff 35%, #3940a5 100%);
  box-shadow: 0 0 16px rgba(124, 140, 255, 0.6);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
  font-weight: 500;
  position: relative;
  padding-bottom: 0.4rem;
}

.nav-links a[aria-current="page"] {
  color: var(--text);
}

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 4px;
}

main {
  padding: 3rem 5vw 4rem;
}

.hero {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: center;
}

.hero-card {
  background: linear-gradient(145deg, rgba(20, 26, 43, 0.9), rgba(15, 20, 36, 0.9));
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.hero-card h1 {
  font-size: clamp(2.4rem, 3.5vw, 3.5rem);
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 50%, var(--accent-strong) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s ease-in-out infinite;
  background-size: 200% auto;
}

.hero-card p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  background: var(--accent);
  color: #0b0f1a;
  border: none;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(124, 140, 255, 0.35);
}

.section-title {
  margin-bottom: 1.5rem;
  font-size: 1.6rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.4rem;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(124, 140, 255, 0.6);
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.4);
}

.card h3 {
  font-size: 1.1rem;
}

.card p {
  color: var(--muted);
  flex: 1;
}

.card button,
.card .button-link {
  align-self: flex-start;
}

.badge {
  background: rgba(124, 140, 255, 0.15);
  color: var(--accent-strong);
  border: 1px solid rgba(124, 140, 255, 0.35);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  width: fit-content;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.panel h2 {
  margin-bottom: 0.75rem;
}

.panel p {
  color: var(--muted);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

label {
  font-size: 0.9rem;
  color: var(--muted);
}

input,
textarea,
select {
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  color: var(--text);
  font-size: 0.95rem;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.helper-text {
  font-size: 0.8rem;
  color: var(--muted);
}

.list {
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.list li {
  background: var(--panel-alt);
  padding: 0.6rem 0.8rem;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 5vw;
  color: var(--muted);
  text-align: center;
}

.notice {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px dashed var(--border);
  color: var(--muted);
  background: rgba(17, 22, 37, 0.6);
  margin-top: 0.75rem;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

.game-shell {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr 320px;
}

.game-board {
  background: #0d1222;
  border: 1px solid var(--border);
  border-radius: 18px;
  min-height: 360px;
  padding: 1.5rem;
}

.game-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

dialog {
  background: transparent;
  border: none;
  padding: 0;
}

dialog::backdrop {
  background: rgba(5, 8, 16, 0.7);
}

@media (max-width: 900px) {
  .navbar {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .game-shell {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   ANIMATIONS & ENHANCED UI
   ============================================ */

/* Keyframe Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInFromRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 16px rgba(124, 140, 255, 0.6);
  }
  50% {
    box-shadow: 0 0 28px rgba(124, 140, 255, 0.9);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Page load animations */
main {
  animation: fadeIn 0.6s ease-out;
}

.hero-card {
  animation: fadeInUp 0.8s ease-out;
}

.hero-card + .panel {
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* Staggered card animations */
.card-grid .card {
  opacity: 0;
  animation: fadeInUp 0.5s ease-out forwards;
}

.card-grid .card:nth-child(1) { animation-delay: 0.1s; }
.card-grid .card:nth-child(2) { animation-delay: 0.2s; }
.card-grid .card:nth-child(3) { animation-delay: 0.3s; }
.card-grid .card:nth-child(4) { animation-delay: 0.4s; }
.card-grid .card:nth-child(5) { animation-delay: 0.5s; }
.card-grid .card:nth-child(6) { animation-delay: 0.6s; }

/* Enhanced Logo Animation */
.brand .logo {
  animation: float 3s ease-in-out infinite, pulse 2s ease-in-out infinite;
  transition: transform 0.3s ease;
}

.brand:hover .logo {
  transform: scale(1.1);
}

/* Enhanced Navigation */
.nav-links a {
  position: relative;
  transition: color 0.3s ease, transform 0.2s ease;
}

.nav-links a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-links a:hover::before {
  width: 100%;
  left: 0;
}

.nav-links a:hover {
  color: var(--text);
  transform: translateY(-2px);
}

/* Enhanced Buttons */
.button {
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.button:active::before {
  width: 300px;
  height: 300px;
}

.button:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 24px rgba(124, 140, 255, 0.4);
}

.button.secondary:hover {
  background: rgba(124, 140, 255, 0.1);
  border-color: var(--accent);
}

.button:active {
  transform: translateY(-1px) scale(0.98);
}

/* Enhanced Cards */
.card {
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(124, 140, 255, 0.05),
    transparent
  );
  transition: left 0.5s ease;
}

.card:hover::before {
  left: 100%;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: rgba(124, 140, 255, 0.8);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.4),
    0 0 40px rgba(124, 140, 255, 0.1);
}

.card:hover .badge {
  background: rgba(124, 140, 255, 0.25);
  transform: scale(1.05);
}

.badge {
  transition: all 0.3s ease;
}

/* Enhanced Panels */
.panel {
  position: relative;
  transition: all 0.3s ease;
}

.panel:hover {
  border-color: rgba(124, 140, 255, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* Input focus animations */
input,
textarea,
select {
  transition: all 0.3s ease;
  background: linear-gradient(145deg, var(--panel-alt), var(--panel));
}

input:hover,
textarea:hover,
select:hover {
  border-color: rgba(124, 140, 255, 0.4);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 140, 255, 0.2);
  transform: translateY(-1px);
}

/* List item animations */
.list li {
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.list li:hover {
  transform: translateX(5px);
  border-color: rgba(124, 140, 255, 0.4);
  background: var(--panel);
}

.list li:hover::before {
  transform: scaleY(1);
}

/* Tool Modal - Fly-in from bottom right animation */
@keyframes flyInFromBottomRight {
  0% {
    opacity: 0;
    transform: translate(100vw, 100vh) scale(0.5);
  }
  100% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
}

@keyframes fadeOut {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

#tool-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  overflow: visible;
}

#tool-modal[open] {
  display: flex;
  align-items: center;
  justify-content: center;
}

#tool-modal[open]::backdrop {
  background: rgba(5, 8, 16, 0.85);
  backdrop-filter: blur(8px);
}

/* Inner container - starts from bottom right, flies to center */
.tool-modal-inner {
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  width: 90vw;
  max-width: 700px;
  max-height: 85vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  opacity: 0;
}

#tool-modal[open] .tool-modal-inner {
  animation: flyInFromBottomRight 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Modal header */
.tool-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}

.tool-modal-header h2 {
  margin: 0;
  font-size: 1.5rem;
}

/* Modal content area */
#tool-modal-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 1.5rem;
  width: 100%;
  box-sizing: border-box;
}

/* Form groups in modal */
#tool-modal-content .form-group {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  margin-bottom: 1rem;
}

#tool-modal-content .form-group > label {
  text-align: left;
  margin-bottom: 0.5rem;
  font-weight: 500;
  display: block;
}

#tool-modal-content input,
#tool-modal-content textarea,
#tool-modal-content select {
  width: 100%;
  box-sizing: border-box;
  max-width: 100%;
}

#tool-modal-content textarea {
  min-height: 120px;
  resize: vertical;
  text-align: left;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.9rem;
}

#tool-modal-content input[type="color"] {
  height: 48px;
  cursor: pointer;
  padding: 4px;
}

#tool-modal-content input[type="number"] {
  text-align: center;
}

#tool-modal-content select {
  cursor: pointer;
}

#tool-modal-content .helper-text {
  margin-top: 0.25rem;
  font-size: 0.85rem;
}

#tool-modal-content button {
  align-self: center;
  margin: 1.5rem 0;
  min-width: 150px;
}

#tool-modal-content .form-group button {
  margin: 0;
}

#tool-modal-content button.secondary {
  margin-top: 0.5rem;
}

/* Checkbox container styling */
#tool-modal-content .checkbox-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  width: 100%;
  max-width: 500px;
  margin-bottom: 1rem;
}

#tool-modal-content .checkbox-group label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

#tool-modal-content .checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 0;
}

/* Inline form groups (for RGB inputs etc) */
#tool-modal-content .form-group-inline {
  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  width: 100%;
  max-width: 500px;
}

#tool-modal-content .form-group-inline input {
  flex: 1;
}

/* Tool output display */
#tool-modal-content .output-display {
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
  font-family: 'Fira Code', 'Consolas', monospace;
  word-break: break-all;
  text-align: left;
  width: 100%;
  max-width: 500px;
}

/* Tool preview boxes (color swatches, gradient previews etc) */
#tool-modal-content .preview-box {
  width: 100%;
  max-width: 500px;
  height: 48px;
  border-radius: 8px;
  margin-top: 1rem;
  border: 1px solid var(--border);
}

/* Tool panels inside modal (JWT decoder etc) */
#tool-modal-content .panel {
  width: 100%;
  max-width: 500px;
  margin: 1rem 0;
  padding: 1rem;
}

#tool-modal-content .panel textarea {
  min-height: 100px;
}

/* Responsive adjustments */
@media (max-height: 700px) {
  .tool-modal-inner {
    max-height: 95vh;
    margin: 1rem;
  }
  
  #tool-modal-content {
    padding: 1rem;
  }
}

/* Section title animation */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 3px;
  animation: shimmer 2s infinite linear;
  background-size: 200% 100%;
}

/* Loading spinner */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Game board enhancements */
.game-board {
  transition: all 0.3s ease;
  position: relative;
}

.game-board:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 140, 255, 0.2);
}

/* Hero actions button stagger */
.hero-actions .button {
  animation: fadeInUp 0.5s ease-out backwards;
}

.hero-actions .button:nth-child(1) { animation-delay: 0.3s; }
.hero-actions .button:nth-child(2) { animation-delay: 0.4s; }

/* Tag animations */
.tag {
  transition: all 0.3s ease;
  cursor: pointer;
}

.tag:hover {
  background: rgba(124, 140, 255, 0.15);
  border-color: rgba(124, 140, 255, 0.5);
  transform: translateY(-2px);
}

/* Footer enhancements */
.footer {
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}

/* Scroll-triggered animations (using intersection observer classes) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.6s ease-out;
}

.reveal-left.active {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.6s ease-out;
}

.reveal-right.active {
  opacity: 1;
  transform: translateX(0);
}

/* Skeleton loading animation */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--panel-alt) 25%,
    var(--panel) 50%,
    var(--panel-alt) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

/* Success/Danger/Warning states with animation */
.notice.success {
  border-color: rgba(45, 212, 191, 0.5);
  background: rgba(45, 212, 191, 0.1);
  animation: fadeInUp 0.4s ease-out;
}

.notice.danger {
  border-color: rgba(249, 115, 22, 0.5);
  background: rgba(249, 115, 22, 0.1);
  animation: shake 0.5s ease-out;
}

.notice.warning {
  border-color: rgba(250, 204, 21, 0.5);
  background: rgba(250, 204, 21, 0.1);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* 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;
  }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Selection color */
::selection {
  background: rgba(124, 140, 255, 0.3);
  color: var(--text);
}

/* Focus visible improvements */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Game shell responsive animation */
@media (max-width: 900px) {
  .game-shell {
    animation: fadeIn 0.5s ease-out;
  }
  
  .game-sidebar {
    animation: fadeInUp 0.5s ease-out 0.2s backwards;
  }
}

/* Game score styling */
#game-score {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin: 0.5rem 0;
  text-shadow: 0 0 20px rgba(124, 140, 255, 0.3);
  transition: all 0.2s ease;
}

/* Enhanced game board */
.game-board {
  position: relative;
  overflow: hidden;
}

.game-board::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(124, 140, 255, 0.03) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
  pointer-events: none;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Tool modal enhancements */
#tool-modal {
  max-width: 90vw;
  max-height: 90vh;
}

#tool-modal .panel {
  max-height: 85vh;
  overflow-y: auto;
}

/* Enhanced form inputs */
input[type="checkbox"],
input[type="radio"] {
  width: 1.2rem;
  height: 1.2rem;
  cursor: pointer;
  accent-color: var(--accent);
}

/* Custom checkbox styling */
input[type="checkbox"] {
  appearance: none;
  background: var(--panel-alt);
  border: 2px solid var(--border);
  border-radius: 4px;
  position: relative;
  transition: all 0.2s ease;
}

input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #0b0f1a;
  font-size: 0.8rem;
  font-weight: bold;
}

/* Tool category badges */
.card .badge {
  transition: all 0.3s ease;
}

.card:hover .badge {
  background: rgba(124, 140, 255, 0.25);
  transform: scale(1.05);
}

/* Active game message */
#game-message {
  min-height: 1.5rem;
  transition: all 0.3s ease;
}

/* Leaderboard list enhancements */
#leaderboard-list li {
  transition: all 0.3s ease;
  animation: fadeInUp 0.4s ease-out backwards;
}

#leaderboard-list li:nth-child(1) { animation-delay: 0.1s; }
#leaderboard-list li:nth-child(2) { animation-delay: 0.2s; }
#leaderboard-list li:nth-child(3) { animation-delay: 0.3s; }
#leaderboard-list li:nth-child(4) { animation-delay: 0.4s; }
#leaderboard-list li:nth-child(5) { animation-delay: 0.5s; }

/* Button ripple effect on click */
.button {
  position: relative;
  overflow: hidden;
}

.button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.button:active::after {
  width: 300px;
  height: 300px;
}

/* Enhanced section titles */
.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: 2rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 3px;
}

/* Helper text animation */
.helper-text {
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.card:hover .helper-text,
.panel:hover .helper-text {
  opacity: 1;
}

/* Card button alignment fix */
.card .button {
  margin-top: auto;
}

/* About page specific styles */
.about-content {
  animation: fadeInUp 0.6s ease-out;
}

.about-content h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.about-content p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

/* Responsive improvements */
@media (max-width: 600px) {
  .hero-card {
    padding: 1.5rem;
  }
  
  .card {
    padding: 1rem;
  }
  
  .panel {
    padding: 1rem;
  }
  
  #game-score {
    font-size: 2.5rem;
  }
}

/* File input styling */
input[type="file"] {
  padding: 0.5rem;
  cursor: pointer;
}

input[type="file"]::file-selector-button {
  background: var(--accent);
  color: #0b0f1a;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  margin-right: 1rem;
  transition: all 0.3s ease;
}

input[type="file"]::file-selector-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(124, 140, 255, 0.4);
}

/* Code/pre blocks */
pre.notice {
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.9rem;
  background: var(--panel-alt);
  padding: 1rem;
  border-radius: 12px;
  overflow-x: auto;
  line-height: 1.8;
}

/* Import/Export buttons container */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group .button {
  align-self: flex-start;
}

/* Status message positioning */
#import-status {
  margin-top: 0.5rem;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.3s ease;
}

/* Enhanced link styling */
a {
  position: relative;
  transition: all 0.3s ease;
}

a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

a:hover::after {
  width: 100%;
}

/* Prevent underline on buttons */
.button::after,
.card .button::after,
nav a::after {
  display: none;
}

/* Card link hover effect */
.card a {
  text-decoration: none;
}

/* Game sidebar score panel */
.game-sidebar .panel:first-child {
  background: linear-gradient(145deg, var(--panel), var(--panel-alt));
}

/* Main content padding adjustment */
main {
  padding-top: 2rem;
}

/* Hero section improvements */
.hero {
  margin-bottom: 2rem;
}

/* Section spacing */
section {
  margin-bottom: 1rem;
}

/* Ensure footer stays at bottom */
body {
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}