:root {
  --colour-brand-primary: #2e5e4e;
  --colour-brand-secondary: #8cbf7b;
  --colour-brand-accent: #f2c879;
  --colour-neutral-900: #1c1c1c;
  --colour-neutral-700: #3c3c3c;
  --colour-neutral-600: #5a5a5a;
  --colour-neutral-500: #7a7a7a;
  --colour-neutral-200: #e5e5e5;
  --colour-neutral-050: #fafafa;
  --colour-bg-default: #fafafa;
  --colour-bg-elevated: #ffffff;
  --colour-bg-accent: #f6f3ea;
  --colour-text-primary: #1c1c1c;
  --colour-text-secondary: #5a5a5a;
  --colour-text-inverse: #ffffff;
  --colour-border-default: #e5e5e5;
  --shadow-1: 0 8px 20px rgba(18, 25, 22, 0.12);
  --colour-error: #b63e3e;
  --radius-2: 10px;
  --radius-3: 14px;
  --radius-pill: 999px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --font-heading: "Fraunces", "Iowan Old Style", "Palatino", serif;
  --font-body: "Source Sans 3", "Avenir Next", "Gill Sans", sans-serif;
  --action-bar-height: 100px;
  --motion-fast: 120ms;
  --motion-base: 180ms;
  --motion-slow: 240ms;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  line-height: 1.5;
  background: radial-gradient(circle at top, #f8f1e3 0%, #f0f5f0 35%, #f6f3ea 60%, #fafafa 100%);
  color: var(--colour-text-primary);
  min-height: 100vh;
  min-height: 100dvh;
}

.app {
  max-width: 520px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  min-height: 100vh;
  min-height: 100dvh;
}

.app__main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.header-actions {
  display: flex;
  gap: var(--space-2);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  color: var(--colour-text-secondary);
  margin: 0 0 var(--space-2);
}

h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0;
}

h2 {
  font-family: var(--font-heading);
  margin: 0;
  font-size: 1.5rem;
}

.screen {
  display: none;
  flex-direction: column;
  flex: 1;
  animation: fade var(--motion-slow) ease-out;
}

.screen.active {
  display: flex;
}

.screen__content {
  flex: 1;
  overflow-y: auto;
  padding-bottom: var(--space-4);
}

.screen__actions {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-4);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
  background: linear-gradient(to top, var(--colour-bg-default) 80%, transparent);
  display: flex;
  gap: var(--space-3);
  justify-content: center;
}

.screen__actions > .button {
  flex: 1;
  max-width: 240px;
}

.screen__actions > .button-row {
  width: 100%;
  max-width: 480px;
  justify-content: center;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.card {
  background: var(--colour-bg-elevated);
  border-radius: var(--radius-3);
  padding: var(--space-4);
  border: 1px solid var(--colour-border-default);
  box-shadow: var(--shadow-1);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.card.hero {
  text-align: center;
  gap: var(--space-4);
}

.card.progress {
  background: linear-gradient(145deg, rgba(140, 191, 123, 0.18), rgba(255, 255, 255, 0.95));
  border-color: rgba(140, 191, 123, 0.5);
}

.card.celebration {
  background: linear-gradient(135deg, rgba(46, 94, 78, 0.18), rgba(242, 200, 121, 0.25));
  border-color: rgba(46, 94, 78, 0.5);
}

.label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.75rem;
  color: var(--colour-text-secondary);
  margin: 0;
}

.value {
  font-size: 1.25rem;
  margin: 0;
}

.muted {
  color: var(--colour-text-secondary);
  margin: 0;
}

.error {
  margin: 0;
  color: var(--colour-error);
  min-height: 1.2em;
}

.progress-bar {
  background: rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-pill);
  height: 8px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  width: 0%;
  background: var(--colour-brand-primary);
  transition: width var(--motion-base) ease;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-align: left;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  color: var(--colour-text-secondary);
}

.feature-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--colour-brand-primary);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 0.55em;
}

.mode-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mode-option {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border-radius: var(--radius-3);
  border: 2px solid var(--colour-border-default);
  background: var(--colour-bg-elevated);
  text-align: left;
  cursor: pointer;
  transition:
    border-color var(--motion-fast) ease,
    background-color var(--motion-fast) ease;
}

.mode-option:hover:not(.active) {
  border-color: var(--colour-neutral-500);
  background: var(--colour-bg-accent);
}

.mode-option.active {
  border-color: var(--colour-brand-primary);
  background: linear-gradient(135deg, rgba(46, 94, 78, 0.08), rgba(140, 191, 123, 0.12));
}

.mode-option__title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--colour-text-primary);
}

.mode-option__desc {
  font-size: 0.9rem;
  color: var(--colour-text-secondary);
}

.pill-group {
  display: inline-flex;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--colour-bg-accent);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.pill {
  border: none;
  background: transparent;
  padding: 12px 18px;
  min-height: 44px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  color: var(--colour-text-secondary);
  cursor: pointer;
  transition: background-color var(--motion-fast) ease;
}

.pill:not(.active):hover {
  background: rgba(0, 0, 0, 0.04);
}

.pill.active {
  background: var(--colour-brand-secondary);
  color: var(--colour-neutral-900);
}

.button {
  border: none;
  border-radius: var(--radius-3);
  padding: 14px 18px;
  min-height: 44px;
  font-size: 1rem;
  cursor: pointer;
  transition:
    background-color var(--motion-fast) ease,
    transform var(--motion-fast) ease;
}

.button:active {
  transform: scale(0.98);
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.button:disabled:active {
  transform: none;
}

.button.primary {
  background: var(--colour-brand-primary);
  color: var(--colour-text-inverse);
}

.button.primary:hover:not(:disabled) {
  background: #245145;
}

.button.secondary {
  background: var(--colour-bg-accent);
  color: var(--colour-text-primary);
  border: 1px solid var(--colour-border-default);
}

.button.secondary:hover:not(:disabled) {
  background: #ede9df;
}

.button.ghost,
.ghost {
  background: transparent;
  color: var(--colour-text-secondary);
  border: 1px dashed var(--colour-border-default);
  padding: 12px 16px;
  min-height: 44px;
  border-radius: var(--radius-3);
  cursor: pointer;
  transition:
    background-color var(--motion-fast) ease,
    border-color var(--motion-fast) ease;
}

.button.ghost:hover:not(:disabled),
.ghost:hover {
  background: rgba(0, 0, 0, 0.02);
  border-color: var(--colour-neutral-500);
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--colour-text-secondary);
  font-size: 0.875rem;
  text-decoration: underline;
  cursor: pointer;
  transition: color var(--motion-fast) ease;
}

.link-button:hover {
  color: var(--colour-text-primary);
}

.undo-link {
  text-align: center;
  margin: 0;
  min-height: 1.5em;
}

.undo-link[data-hidden="true"] {
  visibility: hidden;
}

.button-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.notes-list {
  display: grid;
  gap: var(--space-3);
}

.notes-toolbar {
  display: grid;
  gap: var(--space-3);
}

.note-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.note-group__header {
  border: 1px solid var(--colour-border-default);
  border-radius: var(--radius-3);
  padding: var(--space-3) var(--space-4);
  background: var(--colour-bg-accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  cursor: pointer;
  text-align: left;
}

.note-group__title {
  font-weight: 600;
}

.note-group__count {
  color: var(--colour-text-secondary);
  font-size: 0.85rem;
}

.note-group__toggle {
  font-size: 0.8rem;
  color: var(--colour-text-secondary);
}

.note-group__list {
  display: grid;
  gap: var(--space-3);
}

.note-group[data-collapsed="true"] .note-group__list {
  display: none;
}

.note-item {
  border: 1px solid var(--colour-border-default);
  border-radius: var(--radius-3);
  padding: var(--space-4);
  background: var(--colour-bg-elevated);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  cursor: pointer;
  text-align: left;
}

.note-item:hover {
  border-color: rgba(46, 94, 78, 0.4);
}

.note-item__meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--colour-text-secondary);
}

.note-item__title {
  font-weight: 600;
  margin: 0;
}

.note-item__snippet {
  margin: 0;
  color: var(--colour-text-secondary);
}

.input {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.9rem;
  color: var(--colour-text-secondary);
}

.input input,
.input textarea {
  border-radius: var(--radius-2);
  border: 1px solid var(--colour-border-default);
  padding: 12px 14px;
  font-size: 1rem;
  font-family: var(--font-body);
  color: var(--colour-text-primary);
}

.ring {
  --ring-progress: 100%;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: conic-gradient(
    var(--colour-brand-primary) var(--ring-progress),
    rgba(0, 0, 0, 0.08) 0
  );
  display: grid;
  place-items: center;
  margin: 0 auto;
  transition: background var(--motion-slow) ease;
}

.ring.complete {
  animation: pulse 0.6s ease-in-out 3;
}

.ring.page-marked {
  animation: page-pulse 0.3s ease-out;
}

@keyframes page-pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(46, 94, 78, 0.4);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(46, 94, 78, 0);
  }
}

.ring__center {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--colour-bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  text-align: center;
}

.dots {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--colour-neutral-200);
}

.dot.active {
  background: var(--colour-brand-primary);
}

.step-indicator {
  font-size: 0.8rem;
  color: var(--colour-text-secondary);
  margin: 0;
  text-align: center;
}

@keyframes fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Accessibility utilities */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: var(--space-2) var(--space-4);
  background: var(--colour-brand-primary);
  color: var(--colour-text-inverse);
  text-decoration: none;
  border-radius: 0 0 var(--radius-2) var(--radius-2);
}

.skip-link:focus {
  left: 50%;
  transform: translateX(-50%);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */

:focus-visible {
  outline: 3px solid var(--colour-brand-secondary);
  outline-offset: 2px;
}

.button:focus-visible,
.pill:focus-visible,
.ghost:focus-visible,
.note-item:focus-visible,
.note-group__header:focus-visible,
.mode-option:focus-visible {
  outline: 3px solid var(--colour-brand-secondary);
  outline-offset: 2px;
}

.input input:focus-visible,
.input textarea:focus-visible {
  outline: 3px solid var(--colour-brand-secondary);
  outline-offset: 0;
  border-color: var(--colour-brand-primary);
}

.link-button:focus-visible {
  outline: 2px solid var(--colour-brand-secondary);
  outline-offset: 2px;
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  .screen {
    animation: none;
  }

  .progress-bar__fill {
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}