:root {
  --bg-1: #f7f4ef;
  --bg-2: #eadfcf;
  --ink: #1f2328;
  --brand: #9f1f1f;
  --brand-2: #742222;
  --card: #fff9f1;
  --ok: #176a43;
  --bad: #8f1f1f;
  --line: #d9cdbf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Roboto", sans-serif;
  background: linear-gradient(160deg, var(--bg-1) 0%, var(--bg-2) 100%);
}

.bg {
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 15% 15%, #ffffff88 0, transparent 40%), radial-gradient(circle at 85% 0%, #ffffff55 0, transparent 35%);
  pointer-events: none;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  position: relative;
}

.hero h1,
.hero .kicker,
.panel h2,
.panel h3,
.btn {
  font-family: "Roboto", sans-serif;
}

.hero {
  margin-bottom: 1.5rem;
}

.kicker {
  color: var(--brand-2);
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.03em;
}

h1 {
  margin: 0.3rem 0;
  color: var(--brand);
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 8px 20px #00000010;
}

.sub {
  margin-top: 0;
}

.match-row {
  display: grid;
  grid-template-columns: 1fr 170px;
  gap: 0.8rem;
  align-items: center;
  margin-bottom: 0.7rem;
}

.match-row label {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
}

.pdf-marking .match-row.good label,
.pdf-marking .match-row.good select {
  border-color: #2d8a57;
  background: #e8f6ee;
}

.pdf-marking .match-row.bad label,
.pdf-marking .match-row.bad select {
  border-color: #b94040;
  background: #fdeaea;
}

select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem;
  font: inherit;
  background: #fff;
}

.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.btn {
  border: 1px solid var(--brand-2);
  background: var(--brand);
  color: #fff;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}

.btn:disabled {
  background: #bdbdbd;
  border-color: #9a9a9a;
  color: #f3f3f3;
  cursor: not-allowed;
  opacity: 0.85;
}

#check-a4.ready {
  border-color: #1f6e46;
  box-shadow: 0 0 0 3px #1f6e4622;
}

.btn.ghost {
  background: transparent;
  color: var(--brand-2);
}

.feedback {
  min-height: 1.4rem;
  font-weight: 700;
  white-space: pre-line;
}

.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--bad); }

.sequence-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.dropzone {
  min-height: 140px;
  border: 2px dashed var(--line);
  border-radius: 10px;
  padding: 0.6rem;
  background: #ffffffaa;
}

.step {
  padding: 0.6rem 0.7rem;
  border: 1px solid #bca98d;
  border-radius: 8px;
  margin: 0.4rem 0;
  background: #fff;
  cursor: grab;
  user-select: none;
}

.step.dragging {
  opacity: 0.45;
}

.step.correct-seq {
  background: #dff6e8;
  border-color: #2d8a57;
}

.step.wrong-seq {
  background: #fde7e7;
  border-color: #b94040;
}

.glossary {
  margin-top: 0.8rem;
}

.slide-reference {
  margin: 0.8rem 0 1rem;
}

.slide-reference img {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 10px;
  display: block;
}

.stack-sim {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stack-panel {
  background: #ffffffc4;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
}

.board {
  display: grid;
  gap: 0.7rem;
}

.slot {
  border: 1px solid #c8b8a1;
  border-radius: 10px;
  background: #fff;
  padding: 0.5rem;
}

.slot-title {
  font-family: "Roboto", sans-serif;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: #5b4330;
}

.slot-body {
  min-height: 46px;
  border: 2px dashed #d5c8b6;
  border-radius: 8px;
  padding: 0.25rem;
}

.slot-body.good {
  border-color: #2d8a57;
  background: #e8f6ee;
}

.slot-body.bad {
  border-color: #b94040;
  background: #fdeaea;
}

.slot-body.bad .value-card {
  border-color: #b94040;
  background: #fdeaea;
}

.value-card {
  padding: 0.45rem 0.55rem;
  border: 1px solid #9e8a73;
  border-radius: 8px;
  background: #fffefb;
  cursor: grab;
  font-family: "Roboto", sans-serif;
  font-size: 0.92rem;
}

.value-card.dragging {
  opacity: 0.45;
}

.exam-block {
  margin-bottom: 1rem;
}

.exam-answer {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem;
  font: inherit;
  resize: vertical;
  background: #fff;
}

.pdf-actions {
  margin: 1.2rem 0 0;
  padding: 1rem;
  border: 2px solid #d8b470;
  border-radius: 14px;
  background: linear-gradient(145deg, #fff4db 0%, #f7e8c6 100%);
  box-shadow: 0 8px 20px #00000012;
}

.pdf-download {
  width: 100%;
  border: 1px solid #8a4a1e;
  background: #c45a1a;
  color: #fff;
  border-radius: 10px;
  padding: 0.9rem 1rem;
  font-family: "Roboto", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.pdf-download:disabled {
  opacity: 0.8;
  cursor: wait;
}

@media (max-width: 800px) {
  .sequence-layout { grid-template-columns: 1fr; }
  .stack-sim { grid-template-columns: 1fr; }
  .match-row { grid-template-columns: 1fr; }
}