:root {
  color-scheme: light dark;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f7fa;
  color: #1f2933;
}

body {
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.chart {
  background: #ffffff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.chart h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.form-section {
  display: grid;
  gap: 1.25rem;
  background: #ffffff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

input[type="date"],
input[type="number"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid #d2d6dc;
  border-radius: 8px;
  font-size: 1rem;
  box-sizing: border-box;
}

input[type="date"]:focus,
input[type="number"]:focus {
  outline: none;
  border-color: #4299e1;
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.3);
}

.toggle-wrapper {
  display: grid;
  gap: 0.4rem;
}

.pill-toggle {
  position: relative;
  width: 100%;
  max-width: 240px;
}

.pill-toggle input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.pill-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  background: #e5e7eb;
  border-radius: 999px;
  padding: 0.35rem 0.4rem;
  position: relative;
  transition: background 0.2s ease;
  cursor: pointer;
  min-height: 42px;
}

.pill-option {
  flex: 1;
  text-align: center;
  font-size: 0.95rem;
  font-weight: 600;
  color: #6b7280;
  user-select: none;
  z-index: 1;
}

.pill-thumb {
  position: absolute;
  top: 4px;
  bottom: 4px;
  width: calc(50% - 4px);
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
  transition: transform 0.25s ease;
  transform: translateX(0);
}

.pill-toggle input:checked + .pill-track .pill-thumb {
  transform: translateX(100%);
}

.pill-toggle input:not(:checked) + .pill-track .pill-option-morning,
.pill-toggle input:checked + .pill-track .pill-option-evening {
  color: #1f2937;
}

.pill-toggle input:not(:checked) + .pill-track {
  background: linear-gradient(90deg, rgba(191, 219, 254, 0.4), rgba(219, 234, 254, 0.8));
}

.pill-toggle input:checked + .pill-track {
  background: linear-gradient(90deg, rgba(254, 215, 170, 0.7), rgba(251, 191, 36, 0.25));
}

.time-label {
  font-size: 0.95rem;
  font-weight: 500;
  color: #2563eb;
}

button {
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: white;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
}

button:active {
  transform: translateY(0);
  box-shadow: none;
}

@media (max-width: 640px) {
  .container {
    padding: 1.5rem 1rem 3rem;
  }

  header h1 {
    font-size: 1.5rem;
  }
}