/**
 * QuickTask v2 - Main Styles
 * Minimalist grey design (ftre.co style)
 */

/* === CSS Variables (Design System) === */
:root {
  /* Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #F3F4F6;

  --text-primary: #1A1A1A;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;

  --accent: #6366F1;
  --accent-hover: #5558E3;

  --success: #10B981;
  --success-light: #D1FAE5;

  --warning: #F59E0B;
  --warning-light: #FEF3C7;

  --error: #EF4444;
  --error-light: #FEE2E2;

  --border: #E5E7EB;
  --border-light: #F3F4F6;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  margin: 0;
}

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

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

/* === Layout === */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl);
  width: 100%;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
}

.view {
  flex: 1;
  background-color: var(--bg-secondary);
  padding-top: 70px; /* Nav height */
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0;
}

.nav-menu {
  display: flex;
  gap: var(--space-md);
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.nav-link.active {
  background: var(--bg-tertiary);
  color: var(--accent);
}

.nav-actions {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

/* Sync Controls */
.sync-controls {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
}

.auto-sync-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toggle-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.last-synced-text {
  font-size: 0.625rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
  cursor: pointer;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border);
  transition: var(--transition-base);
  border-radius: 20px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-base);
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--success);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(20px);
}

.toggle-switch:hover .toggle-slider {
  opacity: 0.9;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  color: var(--text-primary);
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

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

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #059669;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

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

.btn-text {
  color: var(--text-secondary);
}

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

.btn-icon {
  padding: var(--space-sm);
  font-size: 1.25rem;
}

.btn-large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
}

.btn-small {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
}

/* === Forms === */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.textarea {
  resize: vertical;
  min-height: 100px;
}

.textarea-large {
  min-height: 300px;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* === Cards === */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.card-hover {
  transition: all var(--transition-base);
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* === Loading === */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  z-index: 9999;
}

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

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

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  top: 90px;
  right: var(--space-xl);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  min-width: 300px;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast-success {
  border-left: 4px solid var(--success);
}

.toast-error {
  border-left: 4px solid var(--error);
}

.toast-warning {
  border-left: 4px solid var(--warning);
}

.toast-message {
  flex: 1;
  font-size: 0.875rem;
}

/* === Empty States === */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-tertiary);
}

.empty-state p {
  margin-bottom: var(--space-md);
}

/* === Utilities === */
.text-small {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.text-success {
  color: var(--success);
}

.text-error {
  color: var(--error);
}

.text-warning {
  color: var(--warning);
}

/* === Mobile Responsive === */
@media (max-width: 768px) {
  .container {
    padding: var(--space-md);
  }

  .nav {
    padding: 0 var(--space-md);
  }

  .nav-menu {
    display: none; /* Will be shown in mobile menu */
  }

  .toast-container {
    right: var(--space-md);
    left: var(--space-md);
  }

  .toast {
    min-width: auto;
  }
}