:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1b1b1d;
  background: #f5f4f1;
  font-synthesis: none;
  --surface: #ffffff;
  --surface-soft: #f7f6f3;
  --line: rgba(27, 27, 29, 0.10);
  --line-strong: rgba(27, 27, 29, 0.16);
  --muted: rgba(27, 27, 29, 0.58);
  --shadow: 0 10px 32px rgba(27, 27, 29, 0.08);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  background: #f5f4f1;
}

button,
input,
select {
  font: inherit;
}

button,
select,
input[type="search"] {
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 420px);
}

.stage {
  min-width: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.topbar-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.eyebrow,
.question-label {
  margin: 0 0 5px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 11px;
  font-weight: 760;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(30px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.025em;
}

.score {
  display: none !important;
}

.mode-switch {
  display: inline-flex;
  padding: 3px;
  border-radius: 13px;
  background: rgba(27, 27, 29, .055);
}

.mode-switch button {
  border: 0;
  background: transparent;
  padding: 8px 12px;
  border-radius: 10px;
  font-weight: 650;
}

.mode-switch button.active {
  background: #fff;
  box-shadow: 0 1px 6px rgba(27, 27, 29, .12);
}

.viewer-wrap {
  position: relative;
  flex: 1;
  min-height: 640px;
  overflow: hidden;
  border-radius: 24px;
  background: #dedbd4;
  box-shadow:
    inset 0 0 0 1px rgba(27, 27, 29, .06),
    0 8px 28px rgba(27, 27, 29, .055);
}

#viewer {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  outline: none;
}

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  background: rgba(245, 244, 241, .9);
  font-weight: 680;
  z-index: 7;
}

.loading.is-hidden {
  display: none;
}

.viewer-tools {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  z-index: 5;
  pointer-events: none;
}

.viewer-tools button,
.viewer-tools > select,
.viewer-settings > summary {
  pointer-events: auto;
  min-height: 36px;
  padding: 7px 11px;
  border-radius: 999px;
  border: 1px solid rgba(27, 27, 29, .11);
  background: rgba(255, 255, 255, .90);
  color: inherit;
  backdrop-filter: blur(12px);
  font-size: 12px;
  font-weight: 620;
  box-shadow: 0 2px 10px rgba(27, 27, 29, .055);
}

.viewer-tools button:disabled {
  display: none;
}

.viewer-settings {
  position: relative;
  pointer-events: auto;
}

.viewer-settings > summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.viewer-settings > summary::-webkit-details-marker {
  display: none;
}

.viewer-settings[open] > summary {
  background: #fff;
}

.viewer-settings-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: min(330px, calc(100vw - 44px));
  display: grid;
  gap: 11px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.97);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.viewer-setting-field {
  display: grid;
  gap: 6px;
  min-width: 0;
  font-size: 12px;
  font-weight: 680;
  color: var(--muted);
}

.viewer-setting-field select,
.viewer-setting-field input[type="range"] {
  width: 100%;
}

.viewer-setting-field select {
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  color: #1b1b1d;
  padding: 7px 9px;
}

.viewer-hint {
  position: absolute;
  left: 12px;
  bottom: 12px;
  max-width: calc(100% - 24px);
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(10px);
  color: rgba(27,27,29,.66);
  font-size: 11px;
  line-height: 1.25;
  pointer-events: none;
}

.panel {
  min-width: 0;
  border-left: 1px solid var(--line);
  background: var(--surface-soft);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.question-card,
.debug {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  padding: 18px;
}

.question-card {
  box-shadow: 0 3px 16px rgba(27,27,29,.035);
}

.question-card h2 {
  margin: 0;
  font-size: clamp(23px, 2.25vw, 31px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  overflow-wrap: anywhere;
}

.feedback {
  min-height: 2.9em;
  line-height: 1.45;
  margin: 12px 0 0;
  color: rgba(27,27,29,.78);
}

.feedback.correct {
  font-weight: 680;
}

.feedback.wrong {
  font-weight: 650;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 16px;
}

.actions.next-only {
  grid-template-columns: 1fr;
}

button {
  border: 1px solid var(--line-strong);
  background: #f4f3f0;
  color: inherit;
  border-radius: 11px;
  padding: 10px 13px;
  cursor: pointer;
}

button.primary,
.learning-start {
  background: #1b1b1d;
  color: #fff;
  border-color: #1b1b1d;
  font-weight: 720;
}

button:disabled {
  opacity: .42;
  cursor: default;
}

.learning-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px;
  align-items: end;
  margin-bottom: 8px;
}

.learning-field,
.learning-mode-field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.learning-field > span,
.learning-mode-field > span,
.search-field > span {
  font-size: 11px;
  font-weight: 720;
  color: var(--muted);
}

.learning-mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.learning-mode-buttons button {
  min-height: 40px;
  padding: 8px 9px;
  background: #fff;
  border-color: var(--line);
  font-size: 12px;
  font-weight: 680;
}

.learning-mode-buttons button.active {
  background: #1b1b1d;
  border-color: #1b1b1d;
  color: #fff;
}

.learning-mode-buttons button:disabled {
  opacity: .34;
}

.learning-field select {
  width: 100%;
  min-width: 0;
  min-height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  color: inherit;
  padding: 8px 9px;
}

.learning-start {
  min-height: 40px;
  align-self: end;
}

.learning-summary {
  margin: 0 0 14px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
}

.session-active .scope-controls,
.session-active .learning-controls,
.session-active .learning-summary,
.session-active #model-source-field {
  display: none;
}

.session-progress {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: 0 0 13px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(27,27,29,.045);
  color: rgba(27,27,29,.7);
  font-size: 11px;
  line-height: 1.35;
}

.session-progress::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 auto 0 0;
  width: var(--session-progress, 0%);
  background: rgba(27,27,29,.055);
  transition: width .2s ease;
}

.session-exit {
  width: fit-content;
  min-height: 36px;
  margin: -6px 0 9px;
  padding: 7px 2px;
  border: 0;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font-size: 12px;
  font-weight: 620;
  text-decoration: none;
}

.session-exit:hover {
  color: #1b1b1d;
}

.name-choices {
  display: grid;
  gap: 7px;
  margin: 12px 0 2px;
}

.name-choice {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #fff;
  padding: 10px 11px;
  color: inherit;
  cursor: pointer;
}

.name-choice:hover {
  background: #f8f7f4;
}

.name-choice.correct {
  border-color: rgba(22,129,72,.38);
  background: rgba(22,129,72,.07);
}

.name-choice.wrong {
  border-color: rgba(117,29,40,.35);
  background: rgba(117,29,40,.06);
}

#reveal-deeper {
  grid-column: 1 / -1;
}

.explore-controls {
  margin-top: 16px;
}

.search-field {
  display: grid;
  gap: 7px;
}

.search-field input {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  padding: 10px 11px;
  background: #fff;
  color: inherit;
}

.search-results {
  display: grid;
  gap: 5px;
  margin-top: 7px;
  max-height: 270px;
  overflow: auto;
}

.search-result {
  text-align: left;
  padding: 9px 10px;
  background: #faf9f7;
}

.search-empty {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.layer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 12px;
}

.debug summary {
  cursor: pointer;
  font-weight: 700;
}

.debug p,
.target-status,
.attribution {
  margin: 0;
  line-height: 1.45;
  font-size: 12px;
}

.target-status {
  margin: 10px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.debug pre {
  max-height: 230px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 10px;
}

.attribution {
  margin-top: auto;
  color: var(--muted);
}

.attribution a {
  color: inherit;
}

.embed-mode .stage,
.embed-mode .panel {
  padding-top: 12px;
  padding-bottom: 12px;
}

.embed-mode .eyebrow {
  display: none;
}

.embed-mode h1 {
  font-size: clamp(24px, 3vw, 36px);
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .panel {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 14px;
  }

  .viewer-wrap {
    min-height: 56dvh;
  }

  .task-docked .viewer-wrap {
    min-height: 76dvh;
  }

  .task-docked .viewer-wrap > .question-card {
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: 10px;
    z-index: 6;
    max-height: min(52dvh, 58%);
    overflow: auto;
    border-radius: 16px;
    padding: 14px;
    background: rgba(255,255,255,.965);
    box-shadow: 0 12px 36px rgba(27,27,29,.18);
    backdrop-filter: blur(16px);
  }

  .task-docked:not(.session-active) .viewer-wrap > .question-card {
    max-height: min(46dvh, 52%);
  }

  .task-docked .viewer-hint {
    display: none;
  }

  .task-docked .viewer-tools {
    right: 10px;
  }

  .session-active.task-docked .question-card h2 {
    font-size: clamp(21px, 6vw, 27px);
  }
}

@media (max-width: 620px) {
  .stage,
  .panel {
    padding: 12px;
  }

  .stage {
    gap: 10px;
  }

  .topbar {
    align-items: flex-start;
    gap: 10px;
  }

  .topbar-tools {
    justify-content: flex-end;
  }

  .eyebrow {
    display: none;
  }

  h1 {
    font-size: clamp(26px, 8vw, 32px);
  }

  .viewer-wrap {
    min-height: 54dvh;
    border-radius: 18px;
  }

  .task-docked .viewer-wrap {
    min-height: 78dvh;
  }

  .viewer-tools {
    top: 9px;
    left: 9px;
    right: 9px;
    gap: 5px;
  }

  .viewer-tools button,
  .viewer-tools > select,
  .viewer-settings > summary {
    min-height: 36px;
    padding: 6px 9px;
    font-size: 11px;
  }

  .viewer-hint {
    left: 9px;
    bottom: 9px;
    max-width: calc(100% - 18px);
    border-radius: 12px;
    white-space: normal;
  }

  .learning-controls {
    grid-template-columns: 1fr 1fr;
  }

  .learning-start {
    width: 100%;
  }

  .session-exit {
    min-height: 40px;
  }

  .actions,
  .layer-actions {
    grid-template-columns: 1fr;
  }

  .panel {
    gap: 12px;
  }

  .attribution {
    font-size: 11px;
  }
}

@media (max-width: 430px) {
  .topbar {
    flex-direction: column;
  }

  .topbar-tools {
    width: 100%;
    justify-content: flex-start;
  }

  .learning-controls {
    grid-template-columns: 1fr;
  }

  .task-docked .viewer-wrap > .question-card {
    max-height: 55dvh;
  }
}


.hint-touch { display: none; }
.hint-pointer { display: inline; }

.feedback {
  white-space: pre-line;
}

@media (pointer: coarse) {
  .hint-touch { display: inline; }
  .hint-pointer { display: none; }
}

@media (max-width: 620px) {
  .session-active.task-docked .topbar,
  .session-active.task-docked .attribution,
  .session-active.task-docked .panel {
    display: none;
  }

  .session-active.task-docked #focus-full {
    display: none;
  }

  .session-active.task-docked .stage {
    padding-top: 8px;
  }

  .session-active.task-docked .viewer-wrap {
    min-height: 88dvh;
  }
}


.session-active .viewer-settings,
.session-active .viewer-hint,
.session-active .attribution {
  display: none;
}


.today-start {
  width: 100%;
  min-height: 40px;
  margin: -4px 0 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  font-weight: 700;
  text-align: left;
}

.today-start:hover {
  background: #f8f7f4;
}

.session-active .today-start {
  display: none !important;
}


.learning-progress {
  margin: -2px 0 14px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.learning-progress > summary {
  min-height: 40px;
  display: flex;
  align-items: center;
  cursor: pointer;
  list-style: none;
  font-size: 12px;
  font-weight: 720;
}

.learning-progress > summary::-webkit-details-marker {
  display: none;
}

.learning-progress-content {
  display: grid;
  gap: 14px;
  padding: 0 0 14px;
}

.progress-block {
  display: grid;
  gap: 7px;
}

.progress-block h3 {
  margin: 0;
  font-size: 12px;
  line-height: 1.3;
}

.progress-line,
.progress-history-line {
  margin: 0;
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}

.progress-region-list {
  display: grid;
  gap: 5px;
}

.progress-region-row {
  display: grid;
  grid-template-columns: minmax(120px, 1.2fr) 1fr;
  gap: 10px;
  padding: 6px 0;
  border-top: 1px solid rgba(27,27,29,.065);
  font-size: 11px;
  line-height: 1.35;
}

.progress-region-row:first-child {
  border-top: 0;
}

.progress-region-name {
  font-weight: 650;
}

.progress-region-stats {
  color: var(--muted);
  text-align: right;
}

.progress-weak-list,
.progress-confusion-list {
  display: grid;
  gap: 6px;
}

.progress-weak-item {
  font-size: 12px;
  line-height: 1.4;
}

.progress-weak-item strong {
  font-weight: 680;
}

.progress-confusion {
  width: 100%;
  min-height: 38px;
  text-align: left;
  background: #fff;
  border-color: var(--line);
  font-size: 12px;
}

.session-active .learning-progress {
  display: none;
}

@media (max-width: 430px) {
  .progress-region-row {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .progress-region-stats {
    text-align: left;
  }
}


.learning-mode-buttons [data-learning-mode="exam"] {
  grid-column: 1 / -1;
}


.connective-layer-options {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  display: grid;
  gap: 7px;
}

.connective-layer-options legend {
  margin: 0 0 2px;
  padding: 0;
  font-size: 11px;
  font-weight: 720;
  color: var(--muted);
}

.connective-layer-options label {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  line-height: 1.35;
  color: rgba(27,27,29,.78);
}

.connective-layer-options input {
  margin: 0;
  flex: 0 0 auto;
}

.viewer-setting-note {
  margin: 0;
  font-size: 11px;
  line-height: 1.4;
  color: var(--muted);
}


.learning-summary {
  white-space: pre-line;
}

.learning-field select optgroup {
  font-weight: 700;
}

.learning-field select option {
  font-weight: 400;
}

.session-active .name-choice:disabled:not(.correct):not(.wrong) {
  opacity: .72;
}


.scope-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  margin-bottom: 10px;
}

.scope-isolation {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 2px;
  font-size: 12px;
  line-height: 1.25;
  color: var(--muted);
  white-space: nowrap;
}

.scope-isolation input {
  margin: 0;
}

@media (max-width: 700px) {
  .scope-controls {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .scope-isolation {
    min-height: 28px;
  }
}


#peel-surface-layer {
  white-space: normal;
}


.deeper-structures {
  margin: 13px 0 2px;
  padding: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 13px;
  background: rgba(27, 27, 29, .035);
}

.deeper-structures-head {
  display: grid;
  gap: 3px;
  margin-bottom: 9px;
}

.deeper-structures-head strong {
  font-size: 13px;
  line-height: 1.25;
}

.deeper-structures-head span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.deeper-structure-list {
  display: grid;
  gap: 6px;
}

.deeper-structure {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(82px, auto) minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 8px 10px;
  text-align: left;
  background: #fff;
  border-color: var(--line);
}

.deeper-structure:hover {
  border-color: var(--line-strong);
  background: #f9f8f5;
}

.deeper-structure-depth {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .045em;
}

.deeper-structure strong {
  min-width: 0;
  font-size: 12px;
  line-height: 1.3;
}

.deeper-focus-feedback {
  color: rgba(27,27,29,.72);
}

@media (max-width: 430px) {
  .deeper-structure {
    grid-template-columns: 1fr;
    gap: 3px;
  }
}