/* ============================================
   Aurora · 极光专注
   Premium Minimal Design System
   ============================================ */

:root {
  --bg-primary: rgba(10, 10, 20, 0.55);
  --bg-secondary: rgba(255, 255, 255, 0.06);
  --bg-hover: rgba(255, 255, 255, 0.1);
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(255, 255, 255, 0.5);
  --text-tertiary: rgba(255, 255, 255, 0.3);
  --accent: #7c7cf0;
  --accent-glow: rgba(124, 124, 240, 0.3);
  --accent-warm: #f0a87c;
  --border: rgba(255, 255, 255, 0.08);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #0a0a14;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
}

/* Aurora Background Canvas */
#aurora {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* App Container */
.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

/* Header */
.header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  opacity: 0.8;
}

.header-actions {
  display: flex;
  gap: 4px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

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

/* Timer Section */
.timer-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  width: 100%;
}

.timer-display {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timer-ring {
  position: relative;
  width: 220px;
  height: 220px;
}

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

.ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.06);
  stroke-width: 3;
}

.ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 628.32;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s ease;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.timer-inner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.timer-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.timer-value {
  font-size: 60px;
  font-weight: 300;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1;
}

/* Mode Selector */
.mode-selector {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.mode-btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

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

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

.mode-custom {
  opacity: 0.5;
}

/* Controls */
.controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.primary-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--radius-xl);
  border: none;
  background: var(--accent);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px var(--accent-glow);
}

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

.primary-btn.running {
  background: #e06060;
  box-shadow: 0 4px 20px rgba(224, 96, 96, 0.3);
}

.secondary-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.secondary-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.secondary-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Sessions Counter */
.sessions-counter {
  display: flex;
  gap: 6px;
}

.session-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-hover);
  transition: var(--transition);
}

.session-dot.filled {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Sound Panel */
.panel-overlay {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-top: 1px solid var(--border);
  padding: 20px 24px 32px;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
}

.panel-overlay.open {
  transform: translateY(0);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.close-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.sound-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}

.sound-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.sound-card:hover {
  background: var(--bg-hover);
}

.sound-card.active {
  border-color: var(--accent);
  background: rgba(124, 124, 240, 0.1);
}

.sound-icon {
  font-size: 24px;
  line-height: 1;
}

.sound-card span {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

.sound-card.active span {
  color: var(--accent);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vol-label {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
  min-width: 32px;
}

.volume-control input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-hover);
  border-radius: 2px;
  outline: none;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Stats Panel */
.panel-overlay {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-top: 1px solid var(--border);
  padding: 20px 24px 32px;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
}

.panel-overlay.open {
  transform: translateY(0);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 20px 8px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}

.stat-value {
  font-size: 28px;
  font-weight: 300;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 20;
}

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

.modal {
  background: rgba(20, 20, 35, 0.95);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 320px;
  animation: modalIn 0.3s ease;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 15px;
  font-weight: 600;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-group label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

.input-group input {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

/* Footer Badge */
.footer-badge {
  position: fixed;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  font-size: 11px;
  color: var(--text-tertiary);
  z-index: 1;
  white-space: nowrap;
}

/* Responsive */
@media (max-width: 480px) {
  .app { padding: 16px; gap: 24px; }
  .timer-ring { width: 180px; height: 180px; }
  .timer-value { font-size: 48px; }
  .panel-overlay, .panel-overlay { padding: 16px 16px 24px; }
  .sound-grid { gap: 6px; }
  .sound-card { padding: 12px 6px; }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.app { animation: fadeIn 0.6s ease; }
.timer-section { animation: slideUp 0.6s ease 0.1s both; }
.mode-selector { animation: slideUp 0.6s ease 0.2s both; }
.controls { animation: slideUp 0.6s ease 0.3s both; }
.sessions-counter { animation: slideUp 0.6s ease 0.35s both; }

/* Notification */
.notification {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 24px;
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-primary);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 30;
  white-space: nowrap;
}

.notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Panel Overlay shared */
.panel-overlay {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel-overlay.open {
  transform: translateY(0);
}

.panel-content {
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-top: 1px solid var(--border);
  padding: 20px 24px 32px;
}

/* Premium badge */
.premium-badge {
  position: fixed;
  top: 8px;
  right: 60px;
  padding: 4px 10px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(124,124,240,0.2), rgba(240,168,124,0.2));
  border: 1px solid rgba(124,124,240,0.3);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 1px;
  z-index: 2;
  cursor: pointer;
  transition: var(--transition);
}

.premium-badge:hover {
  background: linear-gradient(135deg, rgba(124,124,240,0.3), rgba(240,168,124,0.3));
}

/* Premium Indicator */
.premium-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(124, 124, 240, 0.1);
  animation: premiumPulse 2s ease-in-out infinite;
  cursor: pointer;
  transition: var(--transition);
}

.premium-indicator:hover {
  background: rgba(124, 124, 240, 0.2);
  transform: scale(1.1);
}

@keyframes premiumPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(124, 124, 240, 0.2); }
  50% { box-shadow: 0 0 0 6px rgba(124, 124, 240, 0); }
}

/* License info in stats */
.license-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  margin-top: 12px;
}

.license-info:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}