/* Modern variables for consistent theming */
:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --background: #f8fafc;
  --card-background: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius: 1rem;
  --transition: all 0.2s ease-in-out;
}

/* Dark mode variables */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --danger: #f87171;
    --danger-hover: #fb7185;
    --background: #0f172a;
    --card-background: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
  }
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  background-color: var(--background);
  transition: var(--transition);
}

.container {
  background-color: var(--card-background);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 90%;
  width: 400px;
  transition: var(--transition);
}

h1 {
  color: var(--text);
  font-size: 1.875rem;
  margin: 0 0 1.5rem 0;
  font-weight: 700;
}

.timer {
  font-size: 5rem;
  font-weight: 800;
  margin: 1.5rem 0;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.05em;
  transition: var(--transition);
}

.buttons {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  background-color: var(--primary);
  color: white;
  font-weight: 500;
  transition: var(--transition);
  transform: translateY(0);
}

button:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled {
  background-color: var(--text-secondary);
  cursor: not-allowed;
  opacity: 0.7;
}

.custom-time {
  margin: 1.5rem 0;
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
}

input[type="number"] {
  padding: 0.75rem;
  font-size: 0.875rem;
  width: 100px;
  border: 1px solid var(--text-secondary);
  border-radius: 0.5rem;
  background-color: var(--card-background);
  color: var(--text);
  transition: var(--transition);
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.controls {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

#pause,
#reset {
  background-color: var(--danger);
}

#pause:hover:not(:disabled),
#reset:hover:not(:disabled) {
  background-color: var(--danger-hover);
}

/* Remove browser default spinner buttons from number input */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}

/* Smooth transitions when showing/hiding elements */
.buttons,
.custom-time,
.controls {
  transition: opacity 0.3s ease-in-out;
}

/* Optional: Add focus styles for better accessibility */
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}