:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --accent: #059669;
  --accent-hover: #047857;
  --accent-light: #ecfdf5;
  --border: #e2e8f0;
  --border-focus: #10b981;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 6px;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* App Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  width: 260px;
  background-color: #ffffff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
}

.sidebar-header {
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #ffffff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: bold;
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sidebar-nav {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
}

.nav-item:hover, .nav-item.active {
  background-color: var(--accent-light);
  color: var(--accent);
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Mobile Header */
.top-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
}

.menu-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  width: 44px;
  height: 44px;
  font-size: 1.35rem;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-main);
  transition: var(--transition);
}

.menu-btn:hover {
  background-color: var(--bg-main);
}

.header-title-box h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent);
}

.status-dot.saving {
  background-color: #f59e0b;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Content Container */
.content-body {
  padding: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

/* Section Cards */
.section-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.75rem;
  overflow: hidden;
}

.section-header {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background-color: #ffffff;
}

.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.badge-count {
  background-color: var(--bg-main);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.btn-add {
  background-color: var(--accent);
  color: #ffffff;
  border: none;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
  min-height: 40px;
}

.btn-add:hover {
  background-color: var(--accent-hover);
}

/* Task List Items */
.task-list {
  list-style: none;
  divide-y: 1px solid var(--border);
}

.task-item {
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.task-item:last-child {
  border-bottom: none;
}

.task-item:hover {
  background-color: #fcfdfe;
}

.task-checkbox-wrap {
  margin-top: 0.15rem;
}

.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  display: grid;
  place-content: center;
  transition: var(--transition);
  background-color: #ffffff;
}

.task-checkbox:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}

.task-checkbox:checked::before {
  content: "✓";
  font-size: 14px;
  font-weight: bold;
  color: #ffffff;
}

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

.task-text {
  font-size: 0.95rem;
  color: var(--text-main);
  word-break: break-word;
  transition: var(--transition);
}

.task-item.checked .task-text {
  text-decoration: line-through;
  color: var(--text-light);
}

.task-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.25rem;
}

.wikilink-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background-color: var(--accent-light);
  color: var(--accent);
  border: 1px solid rgba(5, 150, 105, 0.2);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  margin-left: 0.5rem;
  transition: var(--transition);
}

.wikilink-badge:hover {
  background-color: var(--accent);
  color: #ffffff;
}

/* Notes Section */
.notes-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.25rem;
}

.note-box {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  padding: 1rem;
  transition: var(--transition);
}

.note-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.note-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.note-title {
  font-size: 1rem;
  font-weight: 700;
  font-style: italic;
  color: var(--text-main);
}

.note-textarea {
  width: 100%;
  min-height: 90px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-main);
  resize: vertical;
  outline: none;
  line-height: 1.5;
  background-color: var(--bg-main);
}

.note-textarea:focus {
  background-color: #ffffff;
  border-color: var(--border-focus);
}

.note-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.note-status {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Modal Dialog */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(2px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  animation: modalIn 0.15s ease-out;
}

@keyframes modalIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-close:hover {
  background-color: var(--bg-main);
}

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: var(--bg-main);
}

.btn-secondary {
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-secondary:hover {
  background-color: var(--bg-main);
}

.btn-primary {
  background: var(--accent);
  border: none;
  color: #ffffff;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

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

/* Mobile responsive drawer */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    transition: transform 0.25s ease-in-out;
    box-shadow: var(--shadow-md);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-btn {
    display: flex;
  }

  .content-body {
    padding: 1rem;
  }

  .section-header {
    padding: 0.875rem 1rem;
  }

  .task-item {
    padding: 0.75rem 1rem;
  }
}