/* ScrollGuard Styles - Coastal Fog Palette */
/* Palette: #D5D8DC, #8FA3B0, #4A6670, #F7F5F2 */

:root {
  /* Colors */
  --color-bg: #F7F5F2;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-border: #D5D8DC;
  --color-text-primary: #2C3E50;
  --color-text-secondary: #5D6D7E;
  --color-text-muted: #8FA3B0;
  --color-accent: #4A6670;
  --color-accent-light: #8FA3B0;
  --color-accent-lighter: #D5D8DC;
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-danger: #E74C3C;
  
  /* Typography */
  --font-display: 'Sentient', Georgia, serif;
  --font-body: 'Erode', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(74, 102, 112, 0.05);
  --shadow-md: 0 4px 12px rgba(74, 102, 112, 0.08);
  --shadow-lg: 0 8px 24px rgba(74, 102, 112, 0.12);
  --shadow-xl: 0 16px 48px rgba(74, 102, 112, 0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms 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-body);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* App Container */
.app-container {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navigation */
.nav-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.logo-icon svg {
  width: 18px;
  height: 18px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.nav-tabs {
  display: flex;
  gap: var(--spacing-xs);
}

.nav-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-tab svg {
  width: 16px;
  height: 16px;
}

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

.nav-tab.active {
  color: var(--color-accent);
  background: rgba(74, 102, 112, 0.08);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--spacing-lg);
}

/* Tab Content */
.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Page Header */
.page-header {
  margin-bottom: var(--spacing-xl);
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.subtitle {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* Cards */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.card h2 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

/* Progress Card */
.progress-card {
  text-align: center;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-xl);
  text-align: left;
}

.progress-header h2 {
  margin-bottom: var(--spacing-xs);
}

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

.limit-badge {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
}

.limit-label {
  display: block;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

.limit-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
}

/* Progress Ring */
.progress-ring-container {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto var(--spacing-xl);
}

.progress-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring-bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 12;
}

.progress-ring-fill {
  fill: none;
  stroke-width: 12;
  stroke-linecap: round;
  transition: stroke-dashoffset var(--transition-slow);
  filter: url(#glow);
}

.progress-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.time-used {
  display: block;
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1;
}

.time-unit {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-left: var(--spacing-xs);
}

.time-total {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

/* Progress Status */
.progress-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

.status-indicator.safe {
  background: var(--color-success);
}

.status-indicator.warning {
  background: var(--color-warning);
}

.status-indicator.danger {
  background: var(--color-danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.status-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* Quick Actions */
.quick-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  flex: 1;
  background: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background: #3A5660;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  flex: 1;
  background: var(--color-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

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

.btn-danger {
  width: 100%;
  background: rgba(231, 76, 60, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(231, 76, 60, 0.2);
}

.btn-danger:hover {
  background: rgba(231, 76, 60, 0.15);
}

.btn-timer {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: 1rem;
}

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

.btn-start:hover {
  background: #219A52;
}

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

.btn-pause:hover {
  background: #D68910;
}

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

.btn-stop:hover {
  background: #C0392B;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.stat-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--spacing-sm);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.stat-icon svg {
  width: 20px;
  height: 20px;
}

.stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

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

/* Chart */
.chart-card {
  padding: var(--spacing-lg);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.chart-header h2 {
  margin-bottom: 0;
}

.chart-legend {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.75rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text-secondary);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

.legend-dot.usage {
  background: var(--color-accent);
}

.legend-dot.limit {
  background: var(--color-border);
}

.chart-container {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--spacing-sm);
  height: 120px;
  margin-bottom: var(--spacing-md);
}

.chart-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.bar-fill {
  width: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  min-height: 4px;
  transition: height var(--transition-slow);
  position: relative;
}

.bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255,255,255,0.3);
}

.bar-fill.over-limit {
  background: var(--color-danger);
}

.bar-fill.today {
  box-shadow: 0 0 0 2px var(--color-accent-light);
}

.chart-labels {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.chart-label {
  flex: 1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.chart-label.today {
  color: var(--color-accent);
  font-weight: 500;
}

/* Insights */
.insights-card {
  padding: var(--spacing-lg);
}

.insight-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.insight-icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.insight-icon svg {
  width: 20px;
  height: 20px;
}

.insight-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Timer Tab */
.timer-card {
  text-align: center;
  padding: var(--spacing-2xl);
}

.timer-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.timer-hours,
.timer-minutes,
.timer-seconds {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 300;
  color: var(--color-text-primary);
  min-width: 2ch;
}

.timer-separator {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 300;
  color: var(--color-text-muted);
  margin-top: -0.5rem;
}

.timer-status {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.timer-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
}

.timer-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-full);
  width: 0%;
  transition: width var(--transition-normal);
}

.timer-progress-fill.warning {
  background: linear-gradient(90deg, var(--color-warning), #F5B041);
}

.timer-progress-fill.danger {
  background: linear-gradient(90deg, var(--color-danger), #EC7063);
}

.timer-limit-info {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}

.timer-controls {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* Sessions List */
.sessions-card {
  padding: var(--spacing-lg);
}

.sessions-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.session-time {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-primary);
  font-weight: 500;
}

.session-time svg {
  width: 16px;
  height: 16px;
  color: var(--color-accent);
}

.session-duration {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state p {
  font-size: 0.9375rem;
}

/* Settings */
.settings-card {
  padding: var(--spacing-lg);
}

.settings-card h2 {
  margin-bottom: var(--spacing-lg);
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.setting-item.toggle-item {
  padding: var(--spacing-md) 0;
}

.setting-info {
  flex: 1;
}

.setting-info label {
  display: block;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

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

.setting-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.setting-control input[type="range"] {
  width: 150px;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: var(--radius-full);
  outline: none;
}

.setting-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.setting-value {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-accent);
  min-width: 60px;
  text-align: right;
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

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

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-border);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.toggle-slider::before {
  content: "";
  position: absolute;
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

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

.toggle input:checked + .toggle-slider::before {
  transform: translateX(22px);
}

/* Setting Options */
.setting-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.option-card {
  cursor: pointer;
}

.option-card input {
  display: none;
}

.option-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
}

.option-card input:checked + .option-content {
  border-color: var(--color-accent);
  background: rgba(74, 102, 112, 0.05);
}

.option-icon {
  width: 48px;
  height: 48px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.option-icon svg {
  width: 24px;
  height: 24px;
}

.option-text {
  display: flex;
  flex-direction: column;
}

.option-title {
  font-weight: 600;
  color: var(--color-text-primary);
}

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

.danger-zone {
  border-color: rgba(231, 76, 60, 0.2);
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.3s ease;
}

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

.modal-content.warning .modal-icon {
  background: var(--color-warning);
}

.modal-content.limit .modal-icon {
  background: var(--color-danger);
}

.modal-icon {
  width: 64px;
  height: 64px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  color: white;
}

.modal-icon svg {
  width: 32px;
  height: 32px;
}

.modal-content h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.modal-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
}

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

/* Time Input */
.time-input-group {
  margin: var(--spacing-xl) 0;
}

.time-input {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.time-input input {
  width: 80px;
  padding: var(--spacing-md);
  font-family: var(--font-display);
  font-size: 2rem;
  text-align: center;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.time-input input:focus {
  border-color: var(--color-accent);
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1001;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
}

.toast {
  background: var(--color-text-primary);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s;
  pointer-events: auto;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateY(-20px); }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 400px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .quick-actions {
    flex-direction: column;
  }
  
  .timer-hours,
  .timer-minutes,
  .timer-seconds {
    font-size: 2.5rem;
  }
}