:root {
  --surface: #fcf8ff;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f6f1ff;
  --on-surface: #19124a;
  --on-surface-variant: #47464b;
  --outline-variant: #c8c5cc;
  --primary: #5e5d69;
  --primary-container: #f3f0ff;
  --secondary: #6050af;
  --secondary-fixed-dim: #c9beff;
  --error: #ba1a1a;

  --radius-card: 3rem;
  --radius-pill: 9999px;
  --space-unit: 8px;
  --space-container: 32px;
  --space-gutter: 24px;
  --space-section: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  font-family: Quicksand, "Segoe UI", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  width: 100%;
  max-width: 800px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px var(--space-container);
  font-family: Outfit, sans-serif;
  font-size: 24px;
  font-weight: 500;
}

header .brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

main {
  width: 100%;
  max-width: 800px;
  padding: var(--space-section) var(--space-container);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-section);
}

.planner {
  width: 100%;
  max-width: 32rem;
  background: var(--surface-container-lowest);
  border-radius: var(--radius-card);
  padding: var(--space-container);
  box-shadow: 0 10px 30px rgba(46, 41, 96, 0.04);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.time-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-gutter);
}

.time-field {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.time-field label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.time-field input[type="time"] {
  font-family: Outfit, sans-serif;
  font-size: 32px;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--primary);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--outline-variant);
  text-align: center;
  width: 100%;
  max-width: 100%;
  padding-bottom: 8px;
}

.time-field input[type="time"]:focus {
  outline: none;
  border-bottom-color: var(--secondary);
}

.calculate-btn {
  margin-top: 12px;
  background: var(--primary-container);
  color: var(--primary);
  font-family: Outfit, sans-serif;
  font-size: 24px;
  font-weight: 500;
  padding: 16px 32px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(201, 190, 255, 0.3);
  box-shadow: 0 0 20px rgba(157, 141, 241, 0.15);
  cursor: pointer;
  width: 100%;
}

.calculate-btn:hover,
.calculate-btn:focus-visible {
  transform: scale(1.05);
  background: var(--secondary-fixed-dim);
}

.calculate-btn:active {
  transform: scale(0.97);
}

.warning {
  color: var(--error);
  text-align: center;
  margin: 8px 0 0;
}

.warning[hidden] {
  display: none;
}

.results {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-gutter);
}

.results[hidden] {
  display: none;
}

.nap-card {
  background: var(--surface-container-low);
  border-radius: 2rem;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nap-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(46, 41, 96, 0.08);
}

.nap-card.unavailable {
  opacity: 0.5;
}

.nap-card h3 {
  font-family: Outfit, sans-serif;
  font-size: 24px;
  font-weight: 500;
  margin: 0;
}

.nap-card p {
  color: var(--on-surface-variant);
  margin: 0;
  flex-grow: 1;
}

.nap-card .label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  margin-top: 12px;
}

.nap-card .alarm {
  font-family: Outfit, sans-serif;
  font-size: 32px;
  font-weight: 500;
  color: var(--primary);
}

.nap-card.unavailable .alarm {
  font-size: 18px;
  font-family: Quicksand, sans-serif;
}

footer {
  width: 100%;
  max-width: 800px;
  padding: var(--space-section) var(--space-container);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--on-surface-variant);
  opacity: 0.6;
}

footer .links {
  display: flex;
  gap: var(--space-gutter);
}

footer a {
  color: inherit;
  text-decoration: none;
}

@media (min-width: 640px) {
  .time-field input[type="time"] {
    font-size: 48px;
  }
}

@media (max-width: 639px) {
  .results {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: no-preference) {
  @keyframes fade-slide-in {
    from {
      opacity: 0;
      transform: translateY(12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes pulse {
    0%, 100% {
      transform: scale(1);
    }
    35% {
      transform: scale(1.12);
      color: var(--secondary);
    }
  }

  @keyframes shake {
    10%, 90% { transform: translateX(-1px); }
    20%, 80% { transform: translateX(2px); }
    30%, 50%, 70% { transform: translateX(-4px); }
    40%, 60% { transform: translateX(4px); }
  }

  .results.visible .nap-card {
    animation: fade-slide-in 0.4s ease both;
  }

  .results.visible .nap-card:nth-child(2) {
    animation-delay: 0.08s;
  }

  .results.visible .nap-card:nth-child(3) {
    animation-delay: 0.16s;
  }

  .nap-card .alarm.pulse {
    animation: pulse 0.4s ease;
  }

  .warning.shake {
    animation: shake 0.4s ease;
  }
}