:root {
  --bg: #0b0f14;
  --bg-panel: #121821;
  --bg-panel-raised: #171f2a;
  --line: #253141;
  --text: #dbe4ee;
  --text-dim: #7d8ba0;
  --accent: #2dd4bf;
  --accent-dim: #1a8577;
  --warn: #f2a65a;
  --danger: #f8717166;
  --danger-solid: #f87171;
  --success: #4ade80;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100%;
}

body {
  background-image:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.015) 0px, rgba(255,255,255,0.015) 1px, transparent 1px, transparent 3px),
    radial-gradient(ellipse at 50% -10%, rgba(45,212,191,0.09), transparent 60%);
  background-attachment: fixed;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

/* ---------- header / boot bar ---------- */
.boot-line {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.boot-line::before { content: "> "; color: var(--text-dim); }
.cursor {
  display: inline-block;
  width: 7px;
  height: 14px;
  background: var(--accent);
  margin-left: 4px;
  animation: blink 1s steps(1) infinite;
  vertical-align: text-bottom;
}
@keyframes blink { 50% { opacity: 0; } }

header h1 {
  font-family: var(--mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 4px 0 4px;
}
header h1 .brk { color: var(--accent); }
header .subtitle {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 28px;
}

/* ---------- progress rail ---------- */
.rail {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
}
.rail-seg {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--line);
  position: relative;
  overflow: hidden;
}
.rail-seg.done { background: var(--accent); }
.rail-seg.active { background: var(--line); }
.rail-seg.active::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 40%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: sweep 1.4s linear infinite;
}
@keyframes sweep {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(340%); }
}
.rail-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-top: -20px;
  margin-bottom: 26px;
  letter-spacing: 0.03em;
}

/* ---------- panel ---------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px 28px;
  margin-bottom: 20px;
}
.panel-locked {
  opacity: 0.45;
  filter: grayscale(0.4);
}
.panel-locked .lock-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.module-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.module-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
}
.module-brief {
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.55;
  margin: 0 0 20px;
}

.q-counter {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.q-score {
  color: var(--accent);
}

.scenario-card {
  background: var(--bg-panel-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 18px 20px;
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 20px;
}

.choices {
  display: grid;
  gap: 10px;
}
.choice-btn {
  text-align: left;
  background: var(--bg-panel-raised);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  padding: 13px 16px;
  border-radius: 7px;
  cursor: pointer;
  transition: border-color 0.12s ease, background 0.12s ease, transform 0.05s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--accent-dim);
  background: #182230;
}
.choice-btn:active:not(:disabled) { transform: scale(0.995); }
.choice-btn:disabled { cursor: default; }
.choice-btn .tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  flex-shrink: 0;
}
.choice-btn.correct {
  border-color: var(--success);
  background: rgba(74, 222, 128, 0.09);
}
.choice-btn.correct .tag { color: var(--success); border-color: var(--success); }
.choice-btn.incorrect {
  border-color: var(--danger-solid);
  background: rgba(248, 113, 113, 0.09);
}
.choice-btn.incorrect .tag { color: var(--danger-solid); border-color: var(--danger-solid); }
.choice-btn.dim { opacity: 0.45; }

.feedback {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 13px;
  min-height: 20px;
}
.feedback.ok { color: var(--success); }
.feedback.no { color: var(--danger-solid); }

.next-row { margin-top: 18px; display: flex; justify-content: flex-end; }

/* ---------- buttons ---------- */
.btn {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  padding: 10px 18px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover { background: var(--accent); color: #05130f; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.solid { background: var(--accent); color: #05130f; }
.btn.solid:hover { background: var(--accent-dim); border-color: var(--accent-dim); }
.btn.ghost { border-color: var(--line); color: var(--text-dim); }
.btn.ghost:hover { background: var(--bg-panel-raised); color: var(--text); }

/* ---------- stage result ---------- */
.result-block { text-align: center; padding: 10px 0 4px; }
.result-score {
  font-family: var(--mono);
  font-size: 42px;
  font-weight: 600;
  margin: 6px 0;
}
.result-score.pass { color: var(--success); }
.result-score.fail { color: var(--warn); }
.result-msg { color: var(--text-dim); font-size: 14.5px; margin-bottom: 18px; }

/* ---------- certificate section ---------- */
.cert-gate {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
}

.cert-form label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}
.cert-form input {
  width: 100%;
  background: var(--bg-panel-raised);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  padding: 11px 14px;
  border-radius: 7px;
  margin-bottom: 18px;
}
.cert-form input:focus {
  outline: none;
  border-color: var(--accent);
}
.cert-form .field-static {
  background: #0e1420;
  color: var(--text-dim);
}

.badge {
  background: linear-gradient(155deg, #101720, #0b1017);
  border: 1px solid var(--accent-dim);
  border-radius: 12px;
  padding: 30px 32px;
  position: relative;
  overflow: hidden;
}
.badge::before {
  content: "";
  position: absolute;
  top: -60%; left: -20%;
  width: 60%; height: 220%;
  background: linear-gradient(120deg, transparent, rgba(45,212,191,0.06), transparent);
  transform: rotate(12deg);
}
.badge-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 22px;
}
.badge-top .stamp {
  color: var(--success);
  border: 1px solid var(--success);
  padding: 3px 8px;
  border-radius: 4px;
}
.badge-name {
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 2px;
}
.badge-line {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 18px;
}
.badge-key {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--accent);
  background: #0a1119;
  border: 1px dashed var(--line);
  border-radius: 6px;
  padding: 10px 14px;
  letter-spacing: 0.06em;
  word-break: break-all;
}
.badge-meta {
  display: flex;
  gap: 24px;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
}
.badge-meta strong { color: var(--text); display: block; font-size: 13px; margin-bottom: 2px; }

.cert-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

footer {
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 40px;
  letter-spacing: 0.04em;
}

.hidden { display: none !important; }

@media (max-width: 600px) {
  .panel { padding: 20px 18px; }
  .badge { padding: 22px 20px; }
  .badge-meta { flex-direction: column; gap: 10px; }
}