:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --accent: #d5ff3f;
  --dark-bg: #161b22;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
}

.todo-input-container input {
  flex: 1;
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-200);
  border-radius: 0.375rem;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.todo-input-container input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.1);
}

.event-card {
  padding: 1rem;
  border: 1px solid var(--gray-200);
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  position: relative;
}

.event-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  color: var(--gray-800);
}

.event-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.event-card .icon-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
}

#event-form {
  margin-bottom: 1.5rem;
}

#event-form.hidden {
  display: none;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--gray-200);
  border-radius: 0.375rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

.dark-mode .event-card {
  border-color: var(--accent);
}

.dark-mode .event-card h3 {
  color: var(--accent);
}

.dark-mode .event-card p {
  color: var(--gray-300);
}

.dark-mode .form-group input {
  background: #2d3748;
  border-color: var(--accent);
  color: var(--accent);
}

.dark-mode .button {
  background: var(--accent);
  color: var(--dark-bg);
}

.dark-mode .button:hover {
  background: #c2ed3d;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  color: var(--gray-600);
}

.introduction {
  padding: 1.5rem;
  margin-bottom: 2rem;
  background: var(--primary);
  color: white;
  border-radius: 0.75rem;
  text-align: center;
}

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

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

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.card {
  background: white;
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  padding: 1.5rem;
  height: fit-content;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.card-header h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  color: var(--gray-800);
}

.card-header svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--primary);
}

.icon-button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-600);
  padding: 0.25rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.icon-button:hover {
  color: var(--primary);
  background-color: var(--gray-100);
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 1rem;
  background: var(--gray-200);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress {
  height: 100%;
  background: var(--primary);
  transition: width 0.5s;
}

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

.percentage {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
}

.todo-container {
  margin-top: 1.5rem;
}

.todo-input-container {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.todo-lists {
  display: grid;
  gap: 1.5rem;
}

.todo-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  border: 1px solid var(--gray-200);
  border-radius: 0.375rem;
  margin-bottom: 0.5rem;
}

.todo-actions {
  display: flex;
  gap: 0.5rem;
}

.mind-map-canvas {
  height: 600px;
  border: 1px solid var(--gray-200);
  border-radius: 0.5rem;
  background: var(--gray-100);
  position: relative;
  overflow: hidden;
}

.node {
  position: absolute;
  background: white;
  padding: 0.5rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  cursor: move;
}

.node input {
  border: none;
  padding: 0.25rem;
  width: 8rem;
}

.connection-point {
  position: absolute;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

.connection-point.start {
  right: -0.5rem;
  bottom: -0.5rem;
}

.connection-point.end {
  left: -0.5rem;
  top: -0.5rem;
  background: #22c55e;
}


.dark-mode {
  background: var(--dark-bg);
  color: var(--accent);
}

.dark-mode .card {
  background: #1f2937;
  border: 1px solid var(--accent);
}

.dark-mode .introduction {
  background: #1f2937;
  border: 1px solid var(--accent);
}

.dark-mode .card-header h2,
.dark-mode .card-header svg,
.dark-mode .icon-button {
  color: var(--accent);
}

.dark-mode .progress-bar {
  background: #2d3748;
}

.dark-mode input {
  background: #2d3748;
  border-color: var(--accent);
  color: var(--accent);
}

.dark-mode .todo-item {
  border-color: var(--accent);
}

.dark-mode .mind-map-canvas {
  background: #1f2937;
  border-color: var(--accent);
}

.dark-mode .node {
  background: #2d3748;
  border: 1px solid var(--accent);
}

.dark-mode .node input {
  background: #2d3748;
  color: var(--accent);
}

.theme-toggle-container {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 1000;
}

.theme-toggle-button {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s;
}

.dark-mode .theme-toggle-button {
  background: var(--accent);
  color: var(--dark-bg);
}

.footer-section {
  margin-top: 3rem;
  padding: 2rem;
  background: white;
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.dark-mode .footer-section {
  background: #1f2937;
  border: 1px solid var(--accent);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.social-icon {
  color: var(--primary);
  transition: color 0.2s;
}

.dark-mode .social-icon {
  color: var(--accent);
}

.quote-container {
  text-align: center;
  font-style: italic;
  color: var(--gray-600);
}

.dark-mode .quote-container {
  color: var(--accent);
}