/* ─────────────────────────── Chapter 8 components ─────────────────────────── */

/* Transaction timeline — two columns showing T1 / T2 interleaving */
.tx-timeline {
  display: grid;
  grid-template-columns: 60px 1fr 1fr;
  gap: 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  margin: 1.4rem 0;
  overflow: hidden;
}
.tx-timeline .tx-head {
  background: var(--paper-darker);
  padding: 0.6rem 0.8rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faded);
  border-bottom: 1px solid var(--line-soft);
}
.tx-timeline .tx-step,
.tx-timeline .tx-cell {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px dotted var(--line-soft);
}
.tx-timeline .tx-step {
  background: var(--paper-dark);
  color: var(--ink-faded);
  font-size: 0.75rem;
  text-align: center;
}
.tx-timeline .tx-cell.has-op { color: var(--ink); background: rgba(31, 78, 121, 0.04); }
.tx-timeline .tx-cell.write { color: var(--rust); font-weight: 500; }
.tx-timeline .tx-cell.commit { color: var(--green); font-weight: 600; }
.tx-timeline .tx-cell.abort { color: var(--blue); font-weight: 600; }
.tx-timeline .tx-cell.empty { color: var(--ink-ghost); }
.tx-timeline > div:nth-last-child(-n+3) { border-bottom: none; }

.tx-timeline.three-col { grid-template-columns: 60px 1fr 1fr 1fr; }
.tx-timeline.three-col > div:nth-last-child(-n+4) { border-bottom: none; }

/* Step-through animated transaction — buttons to step forward/back */
.tx-stepper {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
  margin: 1.4rem 0;
}
.tx-stepper-controls {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin-top: 1rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  flex-wrap: wrap;
}
.tx-stepper-controls button {
  font-family: var(--sans);
  font-size: 0.85rem;
  background: var(--rust);
  color: var(--paper);
  border: none;
  padding: 6px 14px;
  border-radius: 14px;
  cursor: pointer;
  transition: background .15s, opacity .15s;
}
.tx-stepper-controls button:hover { background: var(--rust-dark); }
.tx-stepper-controls button:disabled { opacity: 0.4; cursor: default; }
.tx-stepper-controls .step-counter { color: var(--ink-faded); font-family: var(--mono); font-size: 0.8rem; }
.tx-stepper-narration {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: var(--paper);
  border-left: 3px solid var(--ochre);
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--ink-soft);
  min-height: 2.4rem;
}

/* In timeline, steps highlight as we step */
.tx-timeline .tx-cell.active {
  background: var(--packet-hl);
  color: var(--rust-dark);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--rust);
}
.tx-timeline .tx-cell.past { opacity: 0.7; }
.tx-timeline .tx-cell.future { opacity: 0.35; }

/* Account state display for bank examples */
.state-display {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.state-box {
  flex: 1 1 120px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.92rem;
  text-align: center;
  transition: background .25s, color .25s, transform .15s;
}
.state-box .state-label { font-size: 0.7rem; color: var(--ink-faded); letter-spacing: 0.1em; text-transform: uppercase; display: block; margin-bottom: 4px; }
.state-box.changed { background: rgba(198, 138, 31, 0.18); color: var(--rust-dark); transform: scale(1.04); }

/* Lock compatibility matrix */
.lock-matrix {
  margin: 1.4rem 0;
}
.lock-matrix table {
  width: auto;
  margin: 0 auto;
  font-family: var(--mono);
  font-size: 0.95rem;
}
.lock-matrix th, .lock-matrix td {
  text-align: center;
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--line-soft);
}
.lock-matrix .yes { color: var(--green); font-weight: 600; }
.lock-matrix .no  { color: var(--rust); font-weight: 600; }

/* 2PL mountain figure caption */
.legend-row {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faded);
  margin-top: 0.4rem;
  justify-content: center;
}
.legend-row .swatch { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; vertical-align: middle; }

/* Multiple-choice quiz */
.mcq {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
  margin: 1.4rem 0;
}
.mcq .q-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-bottom: 0.5rem;
}
.mcq .q-text { font-size: 1.05rem; color: var(--ink); margin-bottom: 0.9rem; }
.mcq-options { display: flex; flex-direction: column; gap: 0.5rem; }
.mcq-option {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  font-family: var(--serif);
  font-size: 0.98rem;
  color: var(--ink);
  transition: background .12s, border-color .12s;
}
.mcq-option:hover { background: rgba(31, 78, 121, 0.06); border-color: var(--rust); }
.mcq-option .marker {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--ink-ghost);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faded);
}
.mcq-option.correct {
  background: rgba(61, 107, 58, 0.12);
  border-color: var(--green);
  cursor: default;
}
.mcq-option.correct .marker {
  background: var(--green);
  color: var(--paper);
  border-color: var(--green);
}
.mcq-option.wrong {
  background: rgba(122, 74, 45, 0.10);
  border-color: var(--blue);
  cursor: default;
}
.mcq-option.wrong .marker {
  background: var(--blue);
  color: var(--paper);
  border-color: var(--blue);
}
.mcq-option.locked { cursor: default; opacity: 0.65; }
.mcq-feedback {
  display: none;
  margin-top: 0.9rem;
  padding: 0.8rem 1rem;
  background: var(--paper);
  border-left: 3px solid var(--green);
  border-radius: 0 4px 4px 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.mcq-feedback.show { display: block; }
.mcq-feedback.wrong-feedback { border-left-color: var(--blue); }

/* Anomaly cards (lost update, dirty read, etc.) */
.anomaly-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.8rem;
  margin: 1.4rem 0;
}
.anomaly-card {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--rust);
  border-radius: 0 5px 5px 0;
  padding: 0.9rem 1.1rem;
}
.anomaly-card h4 {
  margin: 0 0 0.4rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--rust);
}
.anomaly-card p { margin: 0; font-size: 0.94rem; color: var(--ink-soft); }

/* ARIES phases */
.aries-phases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin: 1.4rem 0;
}
.aries-phase {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 1rem 1.1rem;
  position: relative;
  transition: background .2s, border-color .2s, transform .2s;
}
.aries-phase.active {
  background: rgba(31, 78, 121, 0.10);
  border-color: var(--rust);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.05);
}
.aries-phase .phase-num {
  position: absolute;
  top: 0.5rem;
  right: 0.7rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-ghost);
  letter-spacing: 0.1em;
}
.aries-phase h4 { margin: 0 0 0.3rem; font-family: var(--serif); font-size: 1.05rem; text-transform: none; letter-spacing: 0; color: var(--rust); }
.aries-phase p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

@media (max-width: 720px) {
  .aries-phases { grid-template-columns: 1fr; }
  .tx-timeline { font-size: 0.82rem; }
}

/* Animated SVG strokes */
@keyframes drawStroke {
  to { stroke-dashoffset: 0; }
}

/* Concept hierarchy diagram */
.hierarchy {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
  margin: 1.4rem 0;
  font-family: var(--mono);
  font-size: 0.9rem;
}
.hierarchy .level {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 0.5rem 1.4rem;
  text-align: center;
  position: relative;
}
.hierarchy .level.l1 { background: rgba(61, 107, 58, 0.10); border-color: var(--green); width: 80%; }
.hierarchy .level.l2 { width: 65%; }
.hierarchy .level.l3 { width: 50%; }
.hierarchy .level.l4 { width: 36%; background: rgba(31, 78, 121, 0.10); border-color: var(--rust); }
.hierarchy .level small { display: block; font-family: var(--serif); font-size: 0.78rem; color: var(--ink-faded); margin-top: 2px; font-style: italic; }

/* Code-like SQL/log block with line numbers */
.numlog {
  background: var(--paper-dark);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 0.6rem 0.4rem;
  margin: 1.2rem 0;
  font-family: var(--mono);
  font-size: 0.86rem;
  overflow-x: auto;
}
.numlog table { width: 100%; border-collapse: collapse; }
.numlog th { background: transparent; font-size: 0.7rem; padding: 0.3rem 0.6rem; }
.numlog td { padding: 0.25rem 0.6rem; border-bottom: 1px dotted var(--line-soft); }
.numlog tr:last-child td { border-bottom: none; }
.numlog .lsn { color: var(--ink-faded); }
.numlog .op-update { color: var(--rust); }
.numlog .op-commit { color: var(--green); font-weight: 600; }
.numlog .op-abort  { color: var(--blue); font-weight: 600; }
.numlog .op-clr    { color: var(--ochre); font-weight: 600; }
.numlog .op-ckpt   { color: var(--ink-faded); font-style: italic; }
.numlog tr.highlight td { background: var(--packet-hl); }