:root {
  color-scheme: light dark;
  --color-bg: #0f1016;
  --color-surface: rgba(23, 25, 38, 0.92);
  --color-surface-alt: rgba(32, 34, 52, 0.78);
  --color-border: rgba(255, 255, 255, 0.12);
  --color-primary: #bb7bff;
  --color-primary-dark: #8a4dd1;
  --color-text: #e7e9f5;
  --color-text-muted: rgba(231, 233, 245, 0.72);
  --color-text-inverse: #1a1931;
  --shadow-soft: 0 18px 36px rgba(0, 0, 0, 0.35);
  --shadow-inner: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --transition: 180ms ease-in-out;
  font-size: clamp(15px, 0.92vw + 0.8rem, 18px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  font-family: 'Work Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top, rgba(97, 77, 155, 0.28), transparent 55%), var(--color-bg);
  color: var(--color-text);
  padding: clamp(1.5rem, 4vw, 3rem) 1.5rem;
}

.app-shell {
  width: min(100%, 640px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 28px;
  box-shadow: var(--shadow-soft);
  padding: clamp(2rem, 5vw, 3rem);
  display: grid;
  gap: 2rem;
}

.app-header {
  text-align: center;
  display: grid;
  gap: 0.75rem;
}

.overline {
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  margin: 0;
}

h1 {
  font-family: 'Playfair Display', 'Times New Roman', serif;
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0;
}

label {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.3rem;
}

.input-row,
.toggle-row {
  display: grid;
  gap: 0.75rem;
}

.input-row {
  text-align: center;
}

input[type="date"],
input[type="time"] {
  width: 100%;
  font-size: 1.2rem;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(17, 19, 30, 0.65);
  color: var(--color-text);
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input[type="date"]:focus,
input[type="time"]:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(187, 123, 255, 0.25);
}

.toggle-wrapper {
  display: grid;
  justify-items: center;
  gap: 0.5rem;
}

.toggle-switch {
  position: relative;
  width: 90px;
  height: 40px;
}

.toggle-switch input {
  display: none;
}

.slider {
  position: absolute;
  inset: 0;
  background: rgba(187, 123, 255, 0.25);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-inner);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.slider::before {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-text);
  top: 50%;
  left: 6px;
  transform: translateY(-50%);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
  transition: transform 220ms cubic-bezier(0.4, 0.14, 0.3, 1.2);
}

.toggle-switch input:checked + .slider {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-color: transparent;
}

.toggle-switch input:checked + .slider::before {
  transform: translate(48px, -50%);
}

.toggle-labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

#lenic-date {
  text-align: center;
  border-radius: 20px;
  padding: 1.5rem;
  background: var(--color-surface-alt);
  color: var(--color-text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 12px 32px rgba(0, 0, 0, 0.23);
  font-size: 1.65rem;
  font-weight: 600;
  line-height: 1.4;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.button-row button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(187, 123, 255, 0.16);
  color: var(--color-text);
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.button-row button:hover,
.button-row button:focus-visible {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(187, 123, 255, 0.35);
  transform: translateY(-1px);
  outline: none;
}

.button-row button.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(187, 123, 255, 0.35);
}

#info-output {
  background: rgba(17, 19, 30, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: var(--shadow-inner);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
}

.info-title {
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.info-list {
  margin: 0;
  padding-left: 1.2em;
}

.holiday {
  display: block;
  margin-top: 0.5rem;
  color: var(--color-text-muted);
}

.len,
.month {
  font-style: italic;
}

.len-group-label {
  margin: 0.6em 0 0.25em;
  font-weight: 600;
  color: var(--color-primary);
}

@media (max-width: 520px) {
  body {
    padding-inline: 1rem;
  }

  .app-shell {
    border-radius: 22px;
    padding: clamp(1.75rem, 6vw, 2.5rem);
  }

  .toggle-labels {
    width: 100%;
  }
}