:root {
  --green-matte: #4B705A;
  --white-accent: #FFFFFF;
  --dark-charcoal: #2C2C2C;
  --light-bg: #F3F5F4;
  --border-subtle: #D1D7D3;
  --danger: #B63B3B;
}

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Montserrat", system-ui, -apple-system, sans-serif;
  background-color: var(--light-bg);
  color: var(--dark-charcoal);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--green-matte);
  color: var(--white-accent);
  padding: 0.5rem 1rem;
  z-index: 999;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* App shell */
.app-shell {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem 1rem;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.logo-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--green-matte);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-e {
  color: var(--white-accent);
  font-weight: 700;
  font-size: 1.5rem;
}

.app-title-wrap {
  display: flex;
  flex-direction: column;
}

.app-title {
  font-size: 1.6rem;
  letter-spacing: 0.12em;
  margin: 0;
}

.app-subtitle {
  margin: 0.2rem 0 0;
  font-size: 0.9rem;
  color: #555;
}

/* Main */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Card */
.card {
  background-color: var(--white-accent);
  border-radius: 12px;
  padding: 1rem 1.1rem 1.2rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.04);
  border: 1px solid var(--border-subtle);
}

.section-title {
  font-size: 1rem;
  margin: 0 0 0.75rem;
}

.help-text {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: #666;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 0.95rem;
  border-radius: 999px;
  padding: 0.5rem 1.1rem;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

.btn:focus-visible {
  outline: 2px solid var(--dark-charcoal);
  outline-offset: 2px;
}

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

.btn-secondary {
  background-color: #E3E9E6;
  color: var(--dark-charcoal);
}

.btn-ghost {
  background-color: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--dark-charcoal);
}

.btn-chip {
  background-color: #E3E9E6;
  color: var(--dark-charcoal);
  min-width: 72px;
}

/* Quick presets */
.quick-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

/* Custom presets */
.custom-preset {
  margin-top: 0.5rem;
}

.field-label {
  font-size: 0.85rem;
  display: block;
  margin-bottom: 0.25rem;
}

.custom-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.input-minutes {
  flex: 1;
  padding: 0.4rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  font-size: 0.95rem;
}

/* Saved presets */
.saved-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* Sound grid */
.sound-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 0.5rem;
}

.sound-tile {
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background-color: #F7F9F8;
  padding: 0.65rem 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sound-tile:focus-visible {
  outline: 2px solid var(--dark-charcoal);
  outline-offset: 2px;
}

.sound-tile.selected {
  background-color: var(--dark-charcoal);
  color: var(--white-accent);
  border-color: var(--dark-charcoal);
}

.sound-label {
  display: block;
}

/* Timer */
.timer-display {
  font-size: 2.4rem;
  font-weight: 600;
  text-align: center;
  margin: 0.5rem 0 1rem;
}

.timer-controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* Footer */
.app-footer {
  margin-top: 1rem;
  text-align: center;
}

.footer-text {
  font-size: 0.8rem;
  color: #777;
  margin: 0;
}

/* Alert overlay */
.alert-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 50;
}

.alert-overlay.active {
  display: flex;
}

.alert-content {
  background-color: var(--white-accent);
  color: var(--dark-charcoal);
  max-width: 360px;
  width: 100%;
  border-radius: 16px;
  padding: 1.5rem 1.5rem 1.25rem;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.alert-content h2 {
  margin: 0 0 0.75rem;
  letter-spacing: 0.14em;
}

.alert-content p {
  margin: 0 0 1.25rem;
  line-height: 1.5;
}

/* Larger screens */
@media (min-width: 600px) {
  .app-shell {
    max-width: 640px;
    padding-inline: 1.5rem;
  }
}