:root {
  color-scheme: light;
  --paper: #f7eddf;
  --paper-elevated: #fffaf1;
  --ink: #18201f;
  --muted: #68716d;
  --line: #decfbd;
  --accent: var(--pack-accent, #7b4ed9);
  --accent-soft: color-mix(in srgb, var(--accent) 14%, white);
  --danger: #9d2d20;
  --shadow: 0 18px 55px rgb(49 34 17 / 14%);
  --radius-lg: 28px;
  --radius-md: 18px;
  --touch: 44px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

html {
  min-block-size: 100%;
  scroll-behavior: smooth;
}

html[data-reduced-motion="true"] {
  scroll-behavior: auto;
}

html[data-text-size="compact"] {
  font-size: 92%;
}

html[data-text-size="large"] {
  font-size: 112%;
}

body {
  min-block-size: 100dvh;
  margin: 0;
  background:
    radial-gradient(circle at top left, rgb(255 255 255 / 78%), transparent 34rem),
    linear-gradient(135deg, #f8eddc 0%, #efe0cc 100%);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a,
textarea,
select,
input {
  outline-color: var(--accent);
  outline-offset: 3px;
}

button {
  min-block-size: var(--touch);
  border: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

a {
  color: color-mix(in srgb, var(--accent) 70%, #101010);
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 0.75rem;
  z-index: 20;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  min-block-size: 100dvh;
}

.boot-panel,
.noscript-panel,
.recovery-view,
.library-view,
.panel-view {
  inline-size: min(1120px, 100%);
  margin-inline: auto;
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) max(2rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
}

.hero-card,
.onboarding-card,
.settings-card,
.pack-card,
.knowledge-card,
.recovery-view {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgb(255 250 241 / 88%);
  box-shadow: var(--shadow);
}

.hero-card {
  margin-block: 1rem 1.25rem;
  padding: clamp(1.3rem, 6vw, 4rem);
}

.onboarding-card {
  display: grid;
  gap: 1rem;
  margin-block-end: 1.25rem;
  padding: 1.2rem;
}

.onboarding-card ul {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding-inline-start: 1.25rem;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  margin-block: 0 0.7rem;
  line-height: 1.03;
}

h1 {
  font-size: clamp(2rem, 12vw, 5.8rem);
  letter-spacing: -0.07em;
}

h2 {
  font-size: clamp(1.45rem, 7vw, 3rem);
  letter-spacing: -0.045em;
}

h3 {
  font-size: 1rem;
}

p {
  line-height: 1.58;
}

.hero-copy {
  max-inline-size: 62ch;
  color: var(--muted);
  font-size: 1.12rem;
}

.small-copy {
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-actions,
.sheet-actions,
.feed-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.primary-button,
.secondary-button,
.ghost-button,
.danger-button,
.icon-button,
.understand-button {
  border-radius: 999px;
  padding: 0.7rem 1rem;
  font-weight: 800;
}

.primary-button {
  background: var(--accent);
  color: white;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--accent) 28%, transparent);
}

.secondary-button,
.icon-button,
.understand-button {
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  background: var(--accent-soft);
  color: var(--ink);
}

.ghost-button {
  background: transparent;
  color: var(--ink);
}

.danger-button {
  background: #ffe5de;
  color: var(--danger);
}

.is-selected {
  background: var(--ink);
  color: #fff;
}

.pack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: 1rem;
}

.pack-card {
  position: relative;
  display: grid;
  gap: 0.6rem;
  padding: 1.2rem;
}

.pack-card h2 {
  font-size: clamp(1.65rem, 3vw, 2.4rem);
}

.pack-card::before {
  content: "";
  position: absolute;
  inset: 0.8rem 0.8rem auto auto;
  inline-size: 3rem;
  block-size: 3rem;
  border-radius: 50%;
  background: var(--accent-soft);
}

.progress-track,
.session-meter {
  overflow: hidden;
  block-size: 0.55rem;
  border-radius: 999px;
  background: #e7dac8;
}

.progress-track span,
.session-meter span {
  display: block;
  block-size: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.feed-view {
  min-block-size: 100dvh;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 10%, transparent), transparent 24rem),
    var(--paper);
}

.feed-header,
.panel-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: calc(0.75rem + env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right)) 0.75rem max(0.75rem, env(safe-area-inset-left));
  border-block-end: 1px solid rgb(80 63 41 / 12%);
  background: rgb(247 237 223 / 88%);
  backdrop-filter: blur(18px);
}

.feed-header h1,
.panel-header h1 {
  margin: 0;
  overflow: hidden;
  font-size: clamp(1rem, 3.5vw, 1.35rem);
  letter-spacing: -0.03em;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-meter {
  position: sticky;
  inset-block-start: calc(3.9rem + env(safe-area-inset-top));
  z-index: 4;
  border-radius: 0;
}

.stopping-point {
  position: sticky;
  inset-block-start: calc(4.5rem + env(safe-area-inset-top));
  z-index: 4;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0.75rem;
  padding: 0.8rem;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: var(--radius-md);
  background: var(--paper-elevated);
  box-shadow: var(--shadow);
}

.snap-feed {
  padding: 0.75rem max(0.75rem, env(safe-area-inset-right)) 0 max(0.75rem, env(safe-area-inset-left));
}

.snap-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-block-size: calc(100dvh - 5rem);
  padding-block-end: calc(6rem + env(safe-area-inset-bottom));
  scroll-snap-align: start;
  scroll-margin-block-start: calc(5rem + env(safe-area-inset-top));
  gap: 0.75rem;
}

.knowledge-card {
  position: relative;
  overflow-x: clip;
  overflow-y: visible;
  align-self: start;
  min-block-size: calc(100dvh - 17rem);
  max-inline-size: 780px;
  inline-size: 100%;
  margin-inline: auto;
  padding: clamp(1rem, 5vw, 2rem);
}

.knowledge-card::after {
  content: "";
  position: absolute;
  inset: auto -4rem -4rem auto;
  inline-size: 12rem;
  block-size: 12rem;
  border-radius: 50%;
  background: var(--accent-soft);
  z-index: 0;
}

.knowledge-card > * {
  position: relative;
  z-index: 1;
}

.card-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block-end: 0.8rem;
}

.category-pill,
.difficulty-pill,
.saved-badge {
  display: inline-flex;
  align-items: center;
  min-block-size: 2rem;
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  background: var(--accent-soft);
  color: color-mix(in srgb, var(--accent) 65%, var(--ink));
  font-size: 0.8rem;
  font-weight: 800;
}

.core-idea {
  color: #28302e;
}

.example-box,
.takeaway,
.note-preview,
.revisit-reason {
  border-radius: var(--radius-md);
  padding: 0.85rem;
  background: rgb(255 255 255 / 58%);
}

.takeaway {
  border-inline-start: 4px solid var(--accent);
  font-weight: 900;
}

.detail-stack summary {
  min-block-size: var(--touch);
  cursor: pointer;
  font-weight: 900;
}

.connection-grid {
  display: grid;
  gap: 1rem;
}

.source-list,
.plain-list {
  padding-inline-start: 1.2rem;
}

.boundary-note,
.hint {
  color: var(--muted);
}

.action-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  max-inline-size: 780px;
  margin-inline: auto;
  padding: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgb(255 250 241 / 96%);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.action-bar button {
  padding-inline: 0.6rem;
}

.feed-controls {
  position: fixed;
  inset: auto max(0.75rem, env(safe-area-inset-right)) env(safe-area-inset-bottom) max(0.75rem, env(safe-area-inset-left));
  z-index: 12;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem;
  border: 1px solid rgb(80 63 41 / 12%);
  border-radius: 22px;
  background: rgb(247 237 223 / 94%);
  box-shadow: 0 10px 32px rgb(49 34 17 / 12%);
  backdrop-filter: blur(18px);
  pointer-events: none;
}

.feed-controls > * {
  pointer-events: auto;
}

.feed-controls > :first-child {
  justify-self: start;
}

.feed-controls > :last-child {
  justify-self: end;
}

.note-sheet {
  position: fixed;
  z-index: 30;
  inset: auto 0 0;
  display: grid;
  gap: 0.7rem;
  padding: 0.8rem max(1rem, env(safe-area-inset-right)) max(1rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  border-radius: 28px 28px 0 0;
  background: var(--paper-elevated);
  box-shadow: 0 -20px 60px rgb(32 22 12 / 24%);
}

.sheet-handle {
  inline-size: 3rem;
  block-size: 0.35rem;
  margin-inline: auto;
  border-radius: 999px;
  background: var(--line);
}

.note-textarea {
  inline-size: 100%;
  min-block-size: min(40dvh, 18rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  resize: vertical;
  background: white;
}

.panel-view {
  display: grid;
  gap: 1rem;
}

.settings-card {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.field-label {
  display: grid;
  gap: 0.4rem;
  font-weight: 800;
}

.field-label select,
.field-label input[type="number"],
.field-label input[type="file"] {
  min-block-size: var(--touch);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.5rem;
  background: white;
}

.plain-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgb(255 255 255 / 55%);
}

.field-label input[type="checkbox"] {
  inline-size: var(--touch);
  block-size: var(--touch);
}

.status-message {
  border-radius: var(--radius-md);
  padding: 0.8rem;
}

.status-message--warning {
  background: #fff1ce;
}

.status-message--error {
  background: #ffe1df;
  color: var(--danger);
}

.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (min-width: 760px) {
  .action-bar {
    grid-template-columns: repeat(6, auto);
    justify-content: center;
  }

  .connection-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .hero-card {
    padding: 1.25rem;
  }

  .hero-card h1 {
    font-size: clamp(2.35rem, 13vw, 3.2rem);
  }

  .hero-actions {
    flex-wrap: nowrap;
    padding-block-end: 0.25rem;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: none;
  }

  .hero-actions::-webkit-scrollbar {
    display: none;
  }

  .hero-actions button {
    flex: 0 0 auto;
    padding-inline: 0.85rem;
  }

  .feed-header {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .feed-header .ghost-button,
  .feed-controls button {
    padding-inline: 0.75rem;
  }

}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}