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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #f5f5f0;
  color: #1f2933;
}

body {
  display: flex;
}

#app {
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: flex;   /* let the active screen stretch */
  min-height: 0;   /* important on mobile so it can shrink/expand correctly */
}

/* Top bar */

#top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  background-color: #e8ecf0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.4);
}

#clock {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.icon-button {
  border: none;
  background-color: #dce4ea;
  color: #2f3c48;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(31, 41, 51, 0.18);
  transition: transform 0.1s ease-out, box-shadow 0.1s ease-out, background-color 0.1s ease-out;
}

.icon-button:hover {
  background-color: #cfd8df;
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(31, 41, 51, 0.22);
}

/* Screens */

.screen {
  flex: 1;
  display: none;
  position: relative;
  padding: 1.5rem;
  background-color: #f5f5f0;
  width: 100%;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

#home-screen {
  align-items: stretch;
}

/* Home screen layout */

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

.home-logo-row {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.app-logo {
  width: 52px;
  height: 52px;
  object-fit: contain;
}

.home-header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.04em;
}

.home-header p {
  margin: 0.6rem 0 0;
  opacity: 0.75;
  font-size: 0.95rem;
}

.mode-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 640px) {
  .mode-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.mode-card {
  border: none;
  border-radius: 1.3rem;
  padding: 1.5rem 1.2rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: 0 12px 28px rgba(31, 41, 51, 0.18);
  transition: transform 0.12s ease-out, box-shadow 0.12s ease-out, filter 0.12s ease-out;
  color: #0f1720;
}

.mode-card .mode-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.mode-card .mode-subtitle {
  font-size: 0.85rem;
  opacity: 0.85;
}

/* Bold, flat colours */

.mode-card.directions {
  background-color: #8bcb9c; /* muted green */
}

.mode-card.numbers {
  background-color: #a7c7e7; /* soft blue */
}

.mode-card.colours {
  background-color: #e3b183; /* warm clay */
}

.mode-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 38px rgba(31, 41, 51, 0.24);
  filter: brightness(1.03);
}

/* Settings */

.settings-button {
  position: absolute;
  right: 1.5rem;
  bottom: 1.5rem;
}

.settings {
  position: absolute;
  left: 1.5rem;
  right: 1.5rem;
  bottom: 4rem;
  background-color: #ffffff;
  padding: 1.1rem 1.2rem;
  border-radius: 1.1rem;
  width: min(520px, calc(100% - 3rem));
  max-width: min(520px, calc(100% - 3rem));
  max-height: 72vh;
  overflow-x: hidden;
  overflow-y: auto;
  box-shadow: 0 18px 42px rgba(31, 41, 51, 0.26);
  font-size: 0.9rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.settings h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.settings-section {
  padding: 0.35rem 0;
  border-top: 1px solid rgba(148, 163, 184, 0.3);
}

.settings-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

.settings-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
}

.settings-heading h3 {
  margin: 0;
  font-size: 0.95rem;
}

.settings-label {
  display: block;
  margin-bottom: 0.4rem;
  opacity: 0.9;
}

.settings-hint {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
  color: #6b7280;
}

.settings-hint.error {
  color: #b91c1c;
}

.pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 0.9rem;
  margin-top: 0.55rem;
}

.checkbox-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0;
  border-radius: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.88rem;
  user-select: none;
  transition: transform 120ms ease;
}

.colour-pill {
  gap: 0.75rem;
  padding: 0;
  min-height: auto;
  font-size: 0.88rem;
}

.checkbox-pill input[type="checkbox"] {
  accent-color: #1f2937;
  margin: 0 0.25rem 0 0;
  flex-shrink: 0;
}

.checkbox-pill:hover {
  transform: translateY(-1px);
}

.pill-text {
  line-height: 1.2;
  font-weight: 400;
  color: #1f2937;
}

.pill-icon {
  font-size: 1.25rem;
  display: inline-block;
  width: 1.35em;
  text-align: center;
  color: #111827;
}

.pill-swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4);
  flex-shrink: 0;
  margin-right: 0.25rem;
}


.number-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.7rem;
  margin-top: 0.4rem;
}

.inline-label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.9rem;
  color: #374151;
}

.inline-label input[type="number"] {
  padding: 0.5rem 0.65rem;
  border-radius: 0.6rem;
  border: 1px solid rgba(148, 163, 184, 0.9);
  font-size: 1rem;
  background-color: #f8fafc;
  width: 100%;
}

.settings .inline-label input[type="number"]:focus,
.checkbox-pill input[type="checkbox"]:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

.settings .inline-label input[type="number"]:focus {
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.input-error {
  border-color: #b91c1c !important;
}

.settings label {
  display: block;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

#interval-input {
  width: 100%;
}

.interval-display {
  margin-top: 0.4rem;
  font-variant-numeric: tabular-nums;
}

/* Mode screen */

#mode-screen {
  overflow: hidden;
}

.mode-label {
  position: absolute;
  inset-inline: 0;
  top: 4.5rem;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.65;
}

/* Flat base colours per mode (initialization / paused) */

.mode-directions {
  background-color: #8bcb9c;
}

.mode-numbers {
  background-color: #a7c7e7;
}

.mode-numbers .display-main {
  font-size: clamp(7rem, 26vw, 10rem);
}

.mode-colours {
  background-color: #ced4da; /* gets overridden by random colours */
}

.mode-colours .display-sub {
  font-size: clamp(2.5rem, 8vw, 3.2rem);
  letter-spacing: 0.22em;
}

/* Center layers */

.center-layer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 1.5rem; /* keeps some breathing space from the top bar */
}

.big-icon {
  font-size: 5rem;
  opacity: 0.9;
}

.display-main {
  font-size: clamp(4rem, 16vw, 6rem);
  font-weight: 700;
  text-align: center;
}

/* Mode-specific sizing */
.mode-directions .display-main {
  font-size: clamp(6rem, 24vw, 9rem);
}

.display-sub {
  margin-top: 1rem;
  font-size: 1.4rem;
  text-align: center;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* Helpers */

.hidden {
  display: none !important;
}

/* Transition cues */
#mode-screen {
  position: relative;
}

.switch-cue {
  animation: switchPop 240ms ease-out;
}

@keyframes switchPop {
  0% {
    transform: scale(0.96);
    opacity: 0.7;
    filter: drop-shadow(0 0 0 rgba(255, 255, 255, 0.4));
  }
  55% {
    transform: scale(1.04);
    opacity: 1;
    filter: drop-shadow(0 10px 32px rgba(255, 255, 255, 0.35));
  }
  100% {
    transform: scale(1);
    opacity: 1;
    filter: drop-shadow(0 0 0 rgba(255, 255, 255, 0));
  }
}

#mode-screen.mode-screen-cue::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0) 55%);
  animation: flashFade 260ms ease-out;
}

@keyframes flashFade {
  0% {
    opacity: 0.9;
  }
  80% {
    opacity: 0.25;
  }
  100% {
    opacity: 0;
  }
}