/* The tutorial's one stylesheet. Zero framework, both color schemes, small screens last. */

:root {
  --bg: #faf8f4;
  --ink: #2b2620;
  --muted: #7a7264;
  --line: #e2dcd0;
  --card: #ffffff;
  --accent: #3e6b4f;
  --accent-ink: #ffffff;
  --green: #2e7d43;
  --amber: #b3760e;
  --code-bg: #f1ede4;
  --danger: #a53f2b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171512;
    --ink: #e8e2d6;
    --muted: #9a9184;
    --line: #35302a;
    --card: #201d19;
    --accent: #6fae87;
    --accent-ink: #10130f;
    --green: #6fae87;
    --amber: #d9a24a;
    --code-bg: #26221d;
    --danger: #d97b62;
  }
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font:
    16px/1.55 Georgia,
    "Times New Roman",
    serif;
  background: var(--bg);
  color: var(--ink);
}
code,
pre,
textarea,
.mono {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.82em;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
}
h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
}
.tagline {
  margin: 0;
  color: var(--muted);
  font-style: italic;
}
.identity {
  text-align: right;
  max-width: 40%;
}
.identity-label {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}
#author-chip {
  word-break: break-all;
  font-size: 0.7rem;
}

main {
  display: grid;
  grid-template-columns: 13rem minmax(24rem, 1.1fr) minmax(24rem, 1fr);
  gap: 0;
  min-height: calc(100vh - 4.5rem);
}
nav {
  border-right: 1px solid var(--line);
  padding: 0.75rem 0;
}
nav button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.45rem 1rem;
  border: 0;
  background: none;
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
nav button:hover {
  background: var(--code-bg);
}
nav button.current {
  background: var(--code-bg);
  font-weight: 700;
}
nav .mark {
  display: inline-block;
  width: 1.2rem;
  color: var(--green);
}
nav .mark.todo {
  color: var(--line);
}

#lesson {
  padding: 1.25rem 1.75rem 3rem;
  border-right: 1px solid var(--line);
  overflow-y: auto;
}
#lesson h2 {
  margin-top: 0.25rem;
}
#lesson .lesson-no {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
#lesson p {
  max-width: 46rem;
  white-space: pre-line;
}
.act {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
}
.act button,
.gql-controls button {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
}
.act button.secondary {
  background: none;
  color: var(--accent);
}
.act input[type="text"] {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  width: 100%;
  margin: 0.25rem 0;
}
.act .result {
  margin-top: 0.5rem;
  font-size: 0.85rem;
}
.act .result.ok {
  color: var(--green);
}
.act .result.bad {
  color: var(--danger);
}
.done-note {
  color: var(--green);
  font-size: 0.9rem;
}

#panes {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.tabs {
  display: flex;
  border-bottom: 1px solid var(--line);
}
.tabs button {
  flex: 1;
  font: inherit;
  padding: 0.5rem;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
}
.tabs button.active {
  color: var(--ink);
  font-weight: 700;
  box-shadow: inset 0 -2px 0 var(--accent);
}
.pane {
  display: none;
  padding: 0.75rem 1rem 2rem;
  overflow-y: auto;
  flex: 1;
}
.pane.active {
  display: block;
}
.pane-hint {
  color: var(--muted);
  font-size: 0.8rem;
  font-style: italic;
  margin-top: 0;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.75rem;
}
.card h3 {
  margin: 0 0 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 400;
}
.card pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.delta {
  border-bottom: 1px solid var(--line);
  padding: 0.45rem 0;
  font-size: 0.8rem;
}
.delta .id {
  color: var(--accent);
}
.delta .who {
  color: var(--muted);
}
.delta .who.you {
  color: var(--green);
}
.delta .who.foreign {
  color: var(--amber);
}
.delta pre {
  margin: 0.2rem 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--muted);
}

#pane-gql textarea {
  width: 100%;
  min-height: 7rem;
  background: var(--code-bg);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem;
}
.gql-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0.5rem 0;
  font-size: 0.85rem;
}
#gql-out {
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.6rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 3rem;
}

@media (max-width: 1100px) {
  main {
    grid-template-columns: 1fr;
  }
  nav {
    display: flex;
    flex-wrap: wrap;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  nav button {
    width: auto;
  }
  #lesson {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

/* ---- v2a instruments ---- */

.badge {
  display: inline-block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.1rem 0.45rem;
  border-radius: 99px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-right: 0.5rem;
}
.badge-constitution {
  border-color: var(--accent);
  color: var(--accent);
}
.badge-registration,
.badge-schema {
  border-color: var(--amber);
  color: var(--amber);
}
.badge-negation,
.badge-tombstone {
  border-color: var(--danger);
  color: var(--danger);
}
.badge-derived {
  border-color: var(--accent);
  color: var(--accent);
}
.badge-public,
.badge-trust,
.badge-grant {
  border-color: var(--green);
  color: var(--green);
}

.delta {
  cursor: pointer;
}
.delta.fresh {
  animation: settle 1.6s ease-out;
}
@keyframes settle {
  from {
    background: var(--code-bg);
  }
  to {
    background: transparent;
  }
}
.delta-line {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.delta-summary {
  margin: 0.15rem 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--muted);
}
.delta-note {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--accent);
  margin-top: 0.15rem;
}
.delta-wire {
  margin-top: 0.4rem;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.5rem;
  white-space: pre-wrap;
  word-break: break-all;
  font-size: 0.72rem;
}

.schema-row {
  padding: 0.25rem 0;
  border-top: 1px solid var(--line);
}
.schema-row:first-of-type {
  border-top: 0;
}
.card {
  position: relative;
}
.card .unpin {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  font: inherit;
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  background: none;
  border: 1px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
  cursor: pointer;
}
.card .unpin:hover {
  background: var(--danger);
  color: var(--bg);
}

#start-over {
  display: inline-block;
  margin-top: 0.4rem;
  font: inherit;
  font-size: 0.72rem;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: none;
  color: var(--muted);
  cursor: pointer;
}
#start-over:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* ---- step-through + in-order gating ---- */

/* One step per row: the button, and (once run) its look-line beneath. */
.step {
  margin: 0.45rem 0;
}
/* The frontier step is the only live one; earlier steps are done, later steps wait. */
.act button:disabled {
  cursor: not-allowed;
}
.act button:disabled:not(.step-done) {
  opacity: 0.45;
}
.act button.step-done {
  background: none;
  color: var(--green);
  border-color: var(--green);
  opacity: 1;
}
.step-look {
  max-width: 42rem;
  margin: 0.3rem 0 0.2rem;
  font-size: 0.82rem;
  font-style: italic;
  color: var(--muted);
}

/* Locked lessons in the nav: visible but unreachable until the earlier ones are green. */
nav button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
nav button:disabled:hover {
  background: none;
}
nav .mark.lock {
  color: var(--muted);
}

#gql-editor {
  border: 1px solid var(--line);
  border-radius: 6px;
  min-height: 7rem;
  background: var(--card);
}
#gql-editor .cm-editor {
  min-height: 7rem;
  font-size: 0.82rem;
}
#gql-editor .cm-editor.cm-focused {
  outline: 2px solid var(--accent);
}
.gql-pin-controls {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}
.gql-pin-controls input {
  font: inherit;
  font-size: 0.8rem;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  width: 8rem;
}
.gql-controls button.secondary {
  background: none;
  color: var(--accent);
}