:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;
  --secondary: #0f172a;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top navigation */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.125rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary-soft);
  border-radius: 8px;
}

.nav {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  background: transparent;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  color: var(--text-muted);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: var(--bg);
  color: var(--text);
}

.nav-link.active {
  background: var(--primary);
  color: #fff;
}

/* Main layout */
.main {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

/* Screens */
.screen {
  display: none;
  animation: fadeIn 0.2s ease;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero / capture */
.hero {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.subtitle {
  color: var(--text-muted);
  margin: 0 0 2rem;
}

.capture-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow-lg);
  text-align: left;
}

.capture-input {
  width: 100%;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 1.125rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.capture-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.capture-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.capture-hints {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.hint {
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

/* Page header */
.page-header {
  margin-bottom: 1.5rem;
}

.page-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border: none;
  border-radius: var(--radius);
  padding: 0.65rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--secondary);
  color: #fff;
}

.btn-secondary:hover {
  background: #334155;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: var(--bg);
  color: var(--text);
}

.btn-small {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  border-radius: 8px;
}

.text-btn {
  background: transparent;
  border: none;
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.text-btn:hover {
  text-decoration: underline;
}

/* Task list */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  margin: 0;
  font-size: 1.125rem;
}

.recent-captures {
  margin-top: 2rem;
}

.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.task-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: box-shadow 0.15s;
}

.task-item:hover {
  box-shadow: var(--shadow);
}

.task-item.done .task-title {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-checkbox {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  cursor: pointer;
}

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

.task-title {
  font-weight: 500;
  word-break: break-word;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-inbox {
  background: #f1f5f9;
  color: #475569;
}

.badge-today {
  background: #fef3c7;
  color: #92400e;
}

.badge-done {
  background: #dcfce7;
  color: #166534;
}

.task-actions {
  display: flex;
  gap: 0.35rem;
  flex-shrink: 0;
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  padding: 2rem;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* Inbox toolbar */
.inbox-toolbar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.filter-input {
  flex: 1;
  min-width: 200px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
  outline: none;
}

.filter-input:focus {
  border-color: var(--primary);
}

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

/* Today focus */
.focus-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 560px) {
  .topbar {
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.75rem;
  }

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

  .main {
    padding: 1rem;
  }

  .hero {
    padding: 1.5rem 0.5rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

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

  .capture-actions .btn {
    width: 100%;
  }

  .focus-summary {
    grid-template-columns: 1fr;
  }

  .inbox-toolbar {
    flex-direction: column;
  }

  .toolbar-actions {
    width: 100%;
  }

  .toolbar-actions .btn {
    flex: 1;
  }
}