/* ==========================================================================
   Qubi Certification - exam UI + certificate (theme-aware, print-aware)
   Loaded on every /qubi/ page; only renders inside #qubiCertApp.
   ========================================================================== */

.qcert {
  --qc-accent: var(--color-secondary, #0687c9);
  --qc-accent-2: #7c3aed;
  --qc-ok: #16a34a;
  --qc-bad: #dc2626;
  --qc-warn: #d97706;
  --qc-card: var(--bg-card, #141428);
  --qc-line: var(--border-subtle, rgba(255, 255, 255, 0.08));
  --qc-line-2: var(--border-default, rgba(255, 255, 255, 0.14));
  color: var(--text-primary, #f1f5f9);
}

/* ---- Hero / intro ---- */
.qcert-hero {
  text-align: center;
  padding: 0.5rem 0 1.25rem;
}
.qcert-kicker {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--qc-accent);
  background: rgba(6, 135, 201, 0.12);
  border: 1px solid rgba(6, 135, 201, 0.25);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}
.qcert-hero h1 {
  font-family: var(--font-display, 'Khand', sans-serif);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.5rem;
  color: var(--text-primary, #f1f5f9);
}
.qcert-lead {
  color: var(--text-secondary, #94a3b8);
  font-size: 1.02rem;
  line-height: 1.6;
  max-width: 44rem;
  margin: 0 auto;
}
.qcert-early-note {
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  color: var(--text-secondary, #94a3b8);
  border-left: 3px solid rgba(220, 38, 38, 0.6);
  padding-left: 0.7rem;
}

.qcert-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 14px;
  margin: 1rem 0;
  border: 1px solid var(--qc-line);
  background: var(--qc-card);
  flex-wrap: wrap;
}
.qcert-banner-success {
  border-color: rgba(22, 163, 74, 0.4);
  background: linear-gradient(135deg, rgba(22, 163, 74, 0.12), rgba(6, 135, 201, 0.08));
}
.qcert-banner-icon { font-size: 2rem; line-height: 1; }
.qcert-banner p { margin: 0.15rem 0 0; color: var(--text-secondary, #94a3b8); font-size: 0.9rem; }
.qcert-banner-actions { margin-left: auto; }

.qcert-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}
@media (min-width: 820px) {
  .qcert-grid { grid-template-columns: 1.2fr 1fr; }
}

.qcert-card {
  background: var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: 16px;
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow-card, 0 8px 30px rgba(0, 0, 0, 0.25));
}
.qcert-card h3 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display, 'Khand', sans-serif);
  font-weight: 600;
  font-size: 1.2rem;
}
.qcert-facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.qcert-facts li {
  position: relative;
  padding-left: 1.2rem;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text-secondary, #94a3b8);
}
.qcert-facts li::before {
  content: "";
  position: absolute;
  left: 0.05rem;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-secondary, #0687c9);
}
.qcert-facts b { color: var(--text-primary, #f1f5f9); }

.qcert-start-card { display: flex; flex-direction: column; }
.qcert-field { display: block; margin-bottom: 0.35rem; }
.qcert-field span {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary, #94a3b8);
  margin-bottom: 0.35rem;
}
.qcert-field input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--qc-line-2);
  background: rgba(0, 0, 0, 0.18);
  color: var(--text-primary, #f1f5f9);
  font-size: 0.95rem;
}
.qcert-field input:focus {
  outline: none;
  border-color: var(--qc-accent);
  box-shadow: 0 0 0 3px rgba(6, 135, 201, 0.2);
}
.qcert-hint { font-size: 0.82rem; color: var(--qc-warn); min-height: 1.1em; margin: 0.15rem 0 0.5rem; }
.qcert-fineprint { font-size: 0.78rem; color: var(--text-muted, #64748b); margin: 0.75rem 0 0; }

/* ---- Buttons ---- */
.qcert-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, opacity 0.15s ease;
}
.qcert-btn:disabled { opacity: 0.55; cursor: not-allowed; }
.qcert-btn-primary {
  background: linear-gradient(135deg, var(--qc-accent), #1a9fe0);
  color: #fff !important;
  box-shadow: 0 8px 22px rgba(6, 135, 201, 0.3);
}
.qcert-btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(6, 135, 201, 0.42); }
.qcert-btn-ghost {
  background: rgba(127, 127, 160, 0.12);
  color: var(--text-primary, #f1f5f9) !important;
  border-color: var(--qc-line-2);
}
.qcert-btn-ghost:hover { background: rgba(127, 127, 160, 0.22); }
.qcert-btn-lg { padding: 0.8rem 1.4rem; font-size: 1rem; margin-top: 0.5rem; }

/* ---- Exam ---- */
.qcert-exam-top { margin-bottom: 1rem; }
.qcert-progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--text-secondary, #94a3b8);
  margin-bottom: 0.4rem;
}
.qcert-progress-meta b { color: var(--text-primary, #f1f5f9); }
.qcert-progress-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--qc-line);
  overflow: hidden;
}
.qcert-progress-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--qc-accent), var(--qc-accent-2));
  transition: width 0.3s ease;
}
.qcert-diff {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}
.qcert-diff-easy { color: #16a34a; background: rgba(22, 163, 74, 0.14); }
.qcert-diff-medium { color: #d97706; background: rgba(217, 119, 6, 0.16); }
.qcert-diff-hard { color: #dc2626; background: rgba(220, 38, 38, 0.16); }

.qcert-qcard {
  background: var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: 16px;
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow-card, 0 8px 30px rgba(0, 0, 0, 0.25));
}
.qcert-qprompt {
  font-size: 1.08rem;
  line-height: 1.55;
  color: var(--text-primary, #f1f5f9);
  margin-bottom: 1rem;
}
.qcert-qprompt code {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.86em;
  background: rgba(127, 127, 160, 0.14);
  border: 1px solid var(--qc-line);
  border-radius: 5px;
  padding: 0.08rem 0.35rem;
  color: #c084fc;
}

/* code blocks inside prompts / fills */
.qcert-code,
.qcert-fill-code {
  background: var(--manual-code-bg, #0c0c18);
  border: 1px solid var(--qc-line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  margin: 0.6rem 0;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--manual-code-fg, #cbd5e1);
  overflow-x: auto;
  white-space: pre;
}
.qcert-code .token-gate, .qcert-fill-code .token-gate { color: #c084fc; font-weight: 600; }
.qcert-code .token-keyword, .qcert-fill-code .token-keyword { color: #9295ff; font-weight: 600; }
.qcert-code .token-preprocessor { color: #f472b6; font-weight: 500; }
.qcert-code .token-number, .qcert-fill-code .token-number { color: #fbbf24; }
.qcert-code .token-comment, .qcert-fill-code .token-comment { color: #96addb; font-style: italic; }
.qcert-code .token-target-qubits { color: #60a5fa; }
.qcert-code .token-control-qubits { color: #63d4b6; }

/* ---- Choices ---- */
.qcert-choices { display: grid; gap: 0.6rem; }
.qcert-choice {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  border: 1.5px solid var(--qc-line-2);
  background: rgba(127, 127, 160, 0.06);
  color: var(--text-primary, #f1f5f9);
  font-size: 0.95rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}
.qcert-choice:hover:not(.is-locked) { border-color: var(--qc-accent); background: rgba(6, 135, 201, 0.08); }
.qcert-choice-mark {
  flex: 0 0 auto;
  width: 1.7rem;
  height: 1.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  background: rgba(127, 127, 160, 0.18);
  font-weight: 700;
  font-size: 0.85rem;
}
.qcert-choice-text code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: rgba(127, 127, 160, 0.16);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  color: #c084fc;
}
.qcert-choice.is-selected { border-color: var(--qc-accent); background: rgba(6, 135, 201, 0.16); }
.qcert-choice.is-selected .qcert-choice-mark { background: var(--qc-accent); color: #fff; }
.qcert-choice.is-answer {
  border-color: var(--qc-ok);
  background: rgba(22, 163, 74, 0.16);
}
.qcert-choice.is-answer .qcert-choice-mark { background: var(--qc-ok); color: #fff; }
.qcert-choice.is-wrong {
  border-color: var(--qc-bad);
  background: rgba(220, 38, 38, 0.14);
}
.qcert-choice.is-wrong .qcert-choice-mark { background: var(--qc-bad); color: #fff; }
.qcert-choice.is-locked { cursor: default; }

/* ---- Fill blanks ---- */
.qcert-blank {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.95em;
  color: #fbbf24;
  background: rgba(6, 135, 201, 0.1);
  border: none;
  border-bottom: 2px solid var(--qc-accent);
  border-radius: 4px 4px 0 0;
  padding: 0.1rem 0.4rem;
  margin: 0 0.15rem;
}
.qcert-blank:focus { outline: none; background: rgba(6, 135, 201, 0.2); }
.qcert-blank.is-ok { border-bottom-color: var(--qc-ok); background: rgba(22, 163, 74, 0.14); color: #86efac; }
.qcert-blank.is-wrong { border-bottom-color: var(--qc-bad); background: rgba(220, 38, 38, 0.14); color: #fca5a5; }

/* ---- Feedback ---- */
.qcert-feedback {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.55;
  border: 1px solid var(--qc-line);
}
.qcert-feedback strong { display: block; font-size: 1rem; margin-bottom: 0.25rem; }
.qcert-feedback-correct { border-color: rgba(22, 163, 74, 0.45); background: rgba(22, 163, 74, 0.1); }
.qcert-feedback-correct strong { color: var(--qc-ok); }
.qcert-feedback-wrong { border-color: rgba(220, 38, 38, 0.45); background: rgba(220, 38, 38, 0.1); }
.qcert-feedback-wrong strong { color: #f87171; }
.qcert-feedback-retry { border-color: rgba(217, 119, 6, 0.45); background: rgba(217, 119, 6, 0.1); }
.qcert-feedback-retry strong { color: var(--qc-warn); }
.qcert-solution { margin: 0.4rem 0; color: var(--text-secondary, #94a3b8); }
.qcert-solution code, .qcert-explain code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.86em;
  background: rgba(127, 127, 160, 0.16);
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
  color: #c084fc;
}
.qcert-explain { color: var(--text-secondary, #94a3b8); }
.qcert-attempts { margin-top: 0.6rem; font-size: 0.82rem; color: var(--qc-warn); min-height: 1em; }

.qcert-exam-actions { display: flex; justify-content: flex-end; gap: 0.75rem; margin-top: 1rem; }

/* ---- Circuit builder ---- */
.qcert-circuit { display: flex; flex-direction: column; gap: 0.75rem; }
.qcert-palette { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.qcert-palette-label { font-size: 0.82rem; color: var(--text-muted, #64748b); font-weight: 600; }
.qcert-pal {
  min-width: 2.6rem;
  padding: 0.4rem 0.7rem;
  border-radius: 9px;
  border: 1.5px solid var(--qc-line-2);
  background: rgba(127, 127, 160, 0.08);
  color: var(--text-primary, #f1f5f9);
  font-family: 'Consolas', monospace;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.qcert-pal:hover { border-color: var(--qc-accent); }
.qcert-pal.is-active {
  border-color: var(--qc-accent);
  background: var(--qc-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(6, 135, 201, 0.4);
}
.qcert-pal-clear { color: var(--qc-bad); font-family: inherit; font-weight: 600; font-size: 0.8rem; }

.qcert-circuit-stage {
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid var(--qc-line);
  border-radius: 12px;
  padding: 0.5rem;
  overflow-x: auto;
}
.qcert-circuit-svg { display: block; }
.qcert-wire { stroke: var(--text-muted, #64748b); stroke-width: 2; opacity: 0.6; }
.qcert-wire-label { fill: var(--text-secondary, #94a3b8); font-family: 'Consolas', monospace; font-size: 13px; }
.qcert-zone {
  fill: rgba(6, 135, 201, 0.06);
  stroke: var(--qc-accent);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  cursor: pointer;
  transition: fill 0.15s ease;
}
.qcert-zone:hover { fill: rgba(6, 135, 201, 0.18); }
.qcert-zone-link { stroke: var(--qc-accent); stroke-width: 1.5; stroke-dasharray: 4 4; opacity: 0.5; }
.qcert-zone-reject { fill: rgba(220, 38, 38, 0.25) !important; stroke: var(--qc-bad) !important; }

.qcert-gate-link { stroke: var(--text-primary, #e2e8f0); stroke-width: 2.5; }
.qcert-gate-ctrl { fill: var(--text-primary, #e2e8f0); }
.qcert-gate-x { fill: var(--text-primary, #e2e8f0); font-size: 22px; font-weight: 700; }
.qcert-gate-box { fill: #4b5563; stroke: rgba(255, 255, 255, 0.25); stroke-width: 1; }
.qcert-gate-box.gate-h { fill: #7c3aed; }
.qcert-gate-box.gate-x { fill: #dc2626; }
.qcert-gate-box.gate-y { fill: #16a34a; }
.qcert-gate-box.gate-z { fill: #2563eb; }
.qcert-gate-box.gate-s, .qcert-gate-box.gate-t,
.qcert-gate-box.gate-sdg, .qcert-gate-box.gate-tdg { fill: #0891b2; }
.qcert-gate-box.gate-cx, .qcert-gate-box.gate-cy { fill: #dc2626; }
.qcert-gate-box.gate-cz { fill: #2563eb; }
.qcert-gate-label { fill: #fff; font-family: 'Consolas', monospace; font-weight: 700; font-size: 14px; }

/* ---- Results ---- */
.qcert-result-head {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 1.5rem;
  border-radius: 16px;
  border: 1px solid var(--qc-line);
  background: var(--qc-card);
  margin-bottom: 1rem;
}
.qcert-result-head.is-pass { border-color: rgba(22, 163, 74, 0.4); background: linear-gradient(135deg, rgba(22, 163, 74, 0.1), rgba(6, 135, 201, 0.06)); }
.qcert-result-head.is-fail { border-color: rgba(220, 38, 38, 0.35); }
.qcert-result-head h1 { font-family: var(--font-display, 'Khand', sans-serif); font-size: clamp(1.5rem, 4vw, 2.1rem); margin: 0 0 0.4rem; }
.qcert-ring { flex: 0 0 auto; }
.qcert-result-actions { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1rem; }

.qcert-bd { display: grid; gap: 0.75rem; }
.qcert-bd-row { display: grid; grid-template-columns: 5rem 1fr 3rem; align-items: center; gap: 0.75rem; }
.qcert-bd-label { font-size: 0.88rem; color: var(--text-secondary, #94a3b8); font-weight: 600; }
.qcert-bd-bar { height: 10px; border-radius: 999px; background: var(--qc-line); overflow: hidden; }
.qcert-bd-bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--qc-accent), var(--qc-accent-2)); }
.qcert-bd-num { font-size: 0.85rem; color: var(--text-primary, #f1f5f9); font-weight: 600; text-align: right; }

/* ---- Certificate view ---- */
.qcert-cert-toolbar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1rem; }
.qcert-cert-toolbar h2 { margin: 0; font-family: var(--font-display, 'Khand', sans-serif); }
.qcert-cert-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; }
.qcert-toggle { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; color: var(--text-secondary, #94a3b8); cursor: pointer; }
.qcert-toggle input { width: 16px; height: 16px; }
.qcert-cert-stage {
  background: repeating-linear-gradient(45deg, rgba(127, 127, 160, 0.05) 0 10px, transparent 10px 20px), var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  justify-content: center;
}
.qcert-cert-paper {
  width: 100%;
  max-width: 920px;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.4);
  border-radius: 8px;
  overflow: hidden;
}
.qcert-cert-paper svg { display: block; width: 100%; height: auto; }
.qcert-cert-back { margin-top: 1rem; }

/* ---- Overview promo ---- */
.docs-cert-promo {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  margin: 1.6rem 0 0.5rem;
  padding: 1.25rem 1.4rem;
  border-radius: 16px;
  border: 1px solid rgba(124, 58, 237, 0.35);
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.14), rgba(6, 135, 201, 0.1));
}
.docs-cert-promo-badge {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #0687c9);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
}
.docs-cert-promo-badge svg { width: 26px; height: 26px; }
.docs-cert-promo-body h2 { margin: 0 0 0.4rem; }
.docs-cert-promo-body p { margin: 0 0 0.85rem; color: var(--text-secondary, #94a3b8); }

/* ==========================================================================
   Print - show ONLY the certificate (scoped to certificate view)
   ========================================================================== */
@media print {
  body.qcert-show-cert .navbar,
  body.qcert-show-cert .docs-sidebar,
  body.qcert-show-cert .docs-sidebar-backdrop,
  body.qcert-show-cert .docs-mobile-menu-btn,
  body.qcert-show-cert .manual-footer,
  body.qcert-show-cert .theme-picker,
  body.qcert-show-cert .no-print {
    display: none !important;
  }
  body.qcert-show-cert,
  body.qcert-show-cert .docs-shell,
  body.qcert-show-cert .docs-main,
  body.qcert-show-cert .docs-content {
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    background: #fff !important;
    max-width: none !important;
    overflow: visible !important;
  }
  body.qcert-show-cert .qcert-cert-stage {
    background: #fff !important;
    border: none !important;
    padding: 0 !important;
  }
  body.qcert-show-cert .qcert-cert-paper {
    max-width: 100% !important;
    box-shadow: none !important;
  }
  @page { size: landscape; margin: 8mm; }
}