:root {
  /* Color Palette */
  --bg-gradient-start: #0a0e27;
  --bg-gradient-end: #1a1f3a;
  --bg-purple: #6366f1;
  --card-bg: rgba(30, 33, 57, 0.8);
  --card-border: rgba(255, 255, 255, 0.1);
  --primary-color: #ff6b6b;
  --primary-hover: #ff5252;
  --secondary-bg: #2a2d47;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --input-bg: rgba(255, 255, 255, 0.05);
  --input-border: rgba(255, 255, 255, 0.15);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: linear-gradient(
    135deg,
    var(--bg-gradient-start) 0%,
    var(--bg-gradient-end) 50%,
    var(--bg-purple) 100%
  );
  min-height: 100vh;
  color: var(--text-primary);
  padding: var(--spacing-lg);
  overflow-x: hidden;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.dot-indicator {
  width: 10px;
  height: 10px;
  background: var(--primary-color);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.9);
  }
}

.info-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s ease;
}

.info-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Customize Section */
.customize-section {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
}

.section-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: color 0.3s ease;
}

.section-title:hover {
  color: var(--primary-color);
}

.toggle-icon {
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.customize-panel.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.customize-panel {
  max-height: 1000px;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.customize-panel.collapsed {
  max-height: 0;
}

.control-group {
  margin-bottom: var(--spacing-lg);
}

.control-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Inputs */
.select-input,
.text-input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.3s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

/* Custom select arrow */
.select-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

/* Select dropdown options styling */
.select-input option {
  background: var(--secondary-bg);
  color: var(--text-primary);
  padding: var(--spacing-sm);
}

.select-input:focus,
.text-input:focus {
  outline: none;
  border-color: var(--primary-color);
  background: rgba(255, 255, 255, 0.08);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}

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

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--secondary-bg);
  transition: 0.3s;
  border-radius: 26px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

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

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(24px);
}

/* Important Dates */
.dates-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.date-item {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.date-item select,
.date-item input {
  flex: 1;
  padding: var(--spacing-sm);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.date-item .emoji-select {
  flex: 0 0 60px;
}

.date-item .remove-btn {
  background: rgba(255, 107, 107, 0.2);
  border: none;
  color: var(--primary-color);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
}

.date-item .remove-btn:hover {
  background: rgba(255, 107, 107, 0.3);
}

.add-date-btn {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--input-bg);
  border: 1px dashed var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.add-date-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  gap: var(--spacing-sm);
}

.theme-btn {
  flex: 1;
  padding: var(--spacing-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.theme-btn:hover {
  background: rgba(255, 255, 255, 0.08);
}

.theme-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.primary-btn,
.secondary-btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.primary-btn {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 4px 16px rgba(255, 107, 107, 0.3);
}

.primary-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

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

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

/* Preview Section */
.preview-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.phone-mockup {
  width: 280px;
  height: 580px;
  margin: 0 auto var(--spacing-md);
  background: #1a1a1a;
  border-radius: 40px;
  padding: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  position: relative;
}

.phone-mockup::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 20px;
  background: #1a1a1a;
  border-radius: 0 0 12px 12px;
  z-index: 2;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: #000;
  border-radius: 32px;
  overflow: hidden;
  position: relative;
}

#previewCanvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.success-message {
  color: #4ade80;
  font-size: 0.95rem;
  animation: fadeIn 0.5s ease;
}

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

/* Instructions */
.instructions {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
  margin-bottom: var(--spacing-xl);
}

.instructions h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.instructions h3:first-child {
  margin-top: 0;
}

.instructions p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.shortcut-link {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  background: #007aff;
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  margin: var(--spacing-md) 0;
  transition: all 0.3s ease;
}

.shortcut-link:hover {
  background: #0051d5;
  transform: translateY(-2px);
}

.tip {
  background: rgba(255, 215, 0, 0.1);
  border-left: 3px solid #ffd700;
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-top: var(--spacing-md);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 400px;
  width: 90%;
  position: relative;
  animation: slideUp 0.3s ease;
}

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

.close-modal {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 2rem;
  cursor: pointer;
  transition: color 0.3s ease;
  line-height: 1;
}

.close-modal:hover {
  color: var(--text-primary);
}

.modal-content h3 {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

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

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

.legend-item .dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Responsive */
@media (max-width: 640px) {
  body {
    padding: var(--spacing-md);
  }

  .title {
    font-size: 1.5rem;
  }

  .phone-mockup {
    width: 240px;
    height: 500px;
  }
}