:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #e5e5e5;
  --card-shadow: 0 2px 8px rgba(0,0,0,0.08);
  --danger: #ef4444;
  --danger-hover: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --border: #3a3a3a;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --danger: #f87171;
    --danger-hover: #ef4444;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100dvh;
  line-height: 1.5;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 1rem;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 0.5rem 0;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.counter-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--card-shadow);
  position: relative;
}

.counter-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.counter-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  display: flex;
  align-items: baseline;
  gap: 0.1em;
}

.counter-value .days {
  color: var(--accent);
}

.counter-value .separator {
  color: var(--text-secondary);
  font-weight: 400;
}

.counter-value .hours,
.counter-value .minutes {
  color: var(--text-primary);
}

.counter-value .minutes {
  font-size: 0.7em;
  color: var(--text-secondary);
}

.counter-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.counter-actions {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}

.edit-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.edit-btn svg {
  width: 16px;
  height: 16px;
}

.hide-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.show-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.show-btn svg {
  width: 16px;
  height: 16px;
}

.counter-collapsed .counter-value,
.counter-collapsed .counter-label {
  display: none;
}

.counter-collapsed {
  opacity: 0.6;
}

.counter-collapsed .counter-name {
  font-size: 0.75rem;
}

.hide-btn svg {
  width: 16px;
  height: 16px;
}

.delete-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Add button */
.add-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.add-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.add-btn svg {
  width: 24px;
  height: 24px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

.modal {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 1.5rem;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal h2 {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group input[type="datetime-local"] {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
}

.form-group input[type="date"],
.form-group input[type="datetime-local"] {
  outline: none;
}

.form-group input[type="date"]:focus,
.form-group input[type="datetime-local"]:focus {
  border-color: var(--accent);
}

input[type="datetime-local"]::-webkit-calendar-picker-indicator {
  opacity: 0.5;
  cursor: pointer;
  filter: var(--calendar-icon-filter, none);
}

@media (prefers-color-scheme: dark) {
  input[type="datetime-local"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
  }
}

.radio-group {
  display: flex;
  gap: 0.5rem;
}

.radio-option {
  flex: 1;
}

.radio-option input {
  display: none;
}

.radio-option label {
  display: block;
  padding: 0.75rem;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.875rem;
  font-weight: 500;
}

.radio-option input:checked + label {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  flex: 1;
  padding: 0.875rem 1.5rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

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

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

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

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

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}

.empty-state p {
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

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

.counter-card {
  animation: fadeIn 0.3s ease-out;
}