/* -- Programming page -- */
.prog-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #2563eb 100%);
  position: relative; overflow: visible; margin-bottom: 20px;
}
.prog-hero::after {
  content: ''; position: absolute; bottom: -40px; left: -5%; right: -5%;
  height: 60px; background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #2563eb 100%);
  border-radius: 0 0 50% 50%;
}
.prog-hero-inner {
  max-width: 820px; margin: 0 auto; padding: 3.5rem 2rem 4.5rem;
  position: relative; z-index: 1; text-align: center;
}
.prog-hero-badge {
  display: inline-block; font-size: 11px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: rgba(255,255,255,0.6); margin-bottom: 14px;
}
.prog-hero-title {
  font-family: 'DM Sans', sans-serif; font-size: 42px; font-weight: 700;
  line-height: 1.1; color: #fff; margin-bottom: 10px; letter-spacing: -0.02em;
}
.prog-hero-sub {
  font-size: 16px; color: rgba(255,255,255,0.7); max-width: 420px;
  margin: 0 auto; line-height: 1.5;
}
.prog-hero-exam {
  display: inline-block; margin-top: 16px; background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2); border-radius: 8px;
  padding: 8px 18px; font-size: 13px; color: rgba(255,255,255,0.8);
}
.prog-hero-exam strong { color: #93c5fd; }

/* progress */
.prog-progress { max-width: 820px; margin: 1.5rem auto 0; padding: 0 2rem; }
.prog-progress-bar {
  background: var(--border); border-radius: 99px; height: 8px; overflow: hidden;
}
.prog-progress-fill {
  height: 100%; width: 0%; border-radius: 99px;
  background: #2563eb; transition: width 0.5s ease;
}
.prog-progress-label {
  display: flex; justify-content: space-between; font-size: 11px;
  color: var(--muted); margin-top: 6px; font-weight: 500;
}

/* sections */
.prog-section {
  background: var(--white); border: 1px solid var(--border); border-radius: 16px;
  margin-bottom: 16px; overflow: hidden; transition: box-shadow 0.2s;
}
.prog-section.active { box-shadow: 0 8px 32px rgba(0,0,0,0.08); }
.prog-section.done { border-color: #bbf7d0; background: #f7fdf9; }
.prog-section-header {
  display: flex; align-items: center; gap: 16px; padding: 22px 24px;
  cursor: pointer;
}
.prog-section-num {
  width: 44px; height: 44px; border-radius: 50%; display: flex;
  align-items: center; justify-content: center; font-family: 'DM Sans', sans-serif;
  font-size: 18px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.prog-section-info { flex: 1; }
.prog-section-title {
  font-size: 17px; font-weight: 700; color: var(--ink); display: flex;
  align-items: center; gap: 8px; flex-wrap: wrap;
}
.prog-section-sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
.prog-section-chevron {
  font-size: 18px; color: var(--muted); transition: transform 0.2s; flex-shrink: 0;
}
.prog-section-chevron.open { transform: rotate(180deg); }
.prog-section-body {
  display: none; padding: 0 24px 24px; border-top: 1px solid var(--border);
}
.prog-section-body.open { display: block; }
.prog-section.done .prog-section-title { color: #065f46; }
.prog-section.done .prog-section-num { background: #16a34a !important; }
.prog-tick { display: none; font-size: 14px; }
.prog-section.done .prog-tick { display: inline; }

/* guide content styling */
.guide-content { margin-top: 16px; }
.guide-content p { margin-bottom: 8px; font-size: 14px; line-height: 1.6; }
.guide-content h3 {
  font-size: 16px; font-weight: 700; margin: 20px 0 10px;
  color: var(--ink);
}
.guide-content code {
  font-family: 'JetBrains Mono', 'DM Mono', monospace; font-size: 12px;
  background: #f1f5f9; padding: 2px 6px; border-radius: 4px;
  color: #2563eb; font-weight: 500;
}
.guide-content .code-block {
  background: #0f172a; color: #e2e8f0;
  font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 12.5px; line-height: 1.65; padding: 14px 18px;
  border-radius: 10px; margin: 8px 0 12px; white-space: pre;
  overflow-x: auto; border-left: 4px solid #2563eb;
}
.guide-content .code-block.python-style { border-left-color: #059669; }
.guide-content .kw { color: #93c5fd; font-weight: 600; }
.guide-content .str { color: #86efac; }
.guide-content .cmt { color: #64748b; font-style: italic; }
.guide-content .num { color: #fbbf24; }
.guide-content .code-label {
  display: inline-block; font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 10px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; padding: 3px 10px; border-radius: 6px 6px 0 0;
  margin-bottom: -1px; position: relative; top: 1px; color: #fff;
}
.guide-content .code-label.ocr { background: #2563eb; }
.guide-content .code-label.python { background: #059669; }
.guide-content .side-by-side {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 12px;
}
.guide-content .side-by-side .code-block { margin: 0; }
.guide-content .callout {
  padding: 12px 16px; border-radius: 10px; margin: 12px 0;
  display: flex; gap: 10px; align-items: flex-start; font-size: 13px;
}
.guide-content .callout-icon { font-size: 18px; flex-shrink: 0; }
.guide-content .callout-body { flex: 1; }
.guide-content .callout-body strong { display: block; margin-bottom: 2px; }
.guide-content .callout.key { background: #dbeafe; border-left: 3px solid #2563eb; }
.guide-content .callout.tip { background: #d1fae5; border-left: 3px solid #059669; }
.guide-content .callout.warning { background: #fef3c7; border-left: 3px solid #d97706; }
.guide-content .callout.danger { background: #fee2e2; border-left: 3px solid #dc2626; }
.guide-content .callout.purple { background: #ede9fe; border-left: 3px solid #7c3aed; }
.guide-content .table-wrap {
  border: 1px solid #e2e8f0; border-radius: 10px; overflow: hidden; margin: 8px 0 12px;
}
.guide-content table { width: 100%; border-collapse: collapse; font-size: 13px; }
.guide-content th {
  background: #f1f5f9; font-weight: 600; text-align: left;
  padding: 8px 12px; border-bottom: 2px solid #cbd5e1;
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; color: #334155;
}
.guide-content td { padding: 6px 12px; border-bottom: 1px solid #e2e8f0; }
.guide-content tr:last-child td { border-bottom: none; }
.guide-content .pattern-card {
  border: 2px solid #e2e8f0; border-radius: 10px; padding: 18px;
  margin: 12px 0; position: relative;
}
.guide-content .pattern-badge {
  position: absolute; top: -11px; left: 18px;
  font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 10px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1.5px; padding: 3px 12px; border-radius: 20px; color: #fff;
}
.guide-content .pattern-card.counting .pattern-badge { background: #2563eb; }
.guide-content .pattern-card.counting { border-color: #93bbfd; }
.guide-content .pattern-card.boolean .pattern-badge { background: #d97706; }
.guide-content .pattern-card.boolean { border-color: #fbbf24; }
.guide-content .pattern-card.algorithm .pattern-badge { background: #7c3aed; }
.guide-content .pattern-card.algorithm { border-color: #c4b5fd; }
.guide-content .mistakes-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 8px 0;
}
.guide-content .mistake-card { border-radius: 8px; padding: 10px 12px; font-size: 13px; }
.guide-content .mistake-card.wrong { background: #fee2e2; border: 1px solid #fca5a5; }
.guide-content .mistake-card.right { background: #d1fae5; border: 1px solid #6ee7b7; }
.guide-content .mistake-label {
  font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 3px;
}
.guide-content .mistake-card.wrong .mistake-label { color: #dc2626; }
.guide-content .mistake-card.right .mistake-label { color: #059669; }
.guide-content .ref-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 8px 0;
}
.guide-content .ref-card {
  background: #f1f5f9; border-radius: 10px; padding: 12px 14px;
}
.guide-content .ref-card h4 {
  margin: 0 0 6px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.5px; color: #334155;
}
.guide-content .ref-card .code-block {
  margin: 0; font-size: 11px; padding: 8px 12px;
}
.guide-content .steps { list-style: none; padding: 0; counter-reset: step-counter; }
.guide-content .steps li {
  counter-increment: step-counter; padding-left: 36px;
  position: relative; margin-bottom: 8px; font-size: 14px;
}
.guide-content .steps li::before {
  content: counter(step-counter); position: absolute; left: 0; top: 0;
  width: 24px; height: 24px; border-radius: 50%; background: #7c3aed;
  color: #fff; font-weight: 700; font-size: 12px;
  display: flex; align-items: center; justify-content: center;
}

/* Q&A panel */
.qa-panel {
  margin-top: 20px; padding-top: 20px; border-top: 2px solid var(--border);
}
.qa-heading {
  font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.qa-item {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-bottom: 14px; padding: 16px; background: #f8fafc;
  border-radius: 12px; border: 1px solid #e2e8f0;
}
.qa-question { font-size: 14px; line-height: 1.6; }
.qa-question .q-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: #2563eb; margin-bottom: 6px;
}
.qa-question .code-block {
  background: #0f172a; color: #e2e8f0;
  font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 12px; line-height: 1.6; padding: 10px 14px;
  border-radius: 8px; margin: 6px 0; white-space: pre;
  border-left: 3px solid #2563eb;
}
.qa-answer textarea {
  width: 100%; min-height: 80px; border: 1px solid #e2e8f0;
  border-radius: 8px; padding: 10px 12px; font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 13px; color: var(--ink); background: #fff;
  resize: vertical; outline: none;
}
.qa-answer textarea:focus { border-color: #2563eb; }
.qa-answer .a-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--muted); margin-bottom: 6px;
}
.qa-model {
  display: none; margin-top: 8px; padding: 12px 14px;
  background: #d1fae5; border-radius: 8px; border-left: 3px solid #059669;
  font-size: 13px; line-height: 1.5; color: #14532d;
  grid-column: 1 / -1;
}
.qa-model.visible { display: block; }
.qa-model .model-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: #059669; margin-bottom: 4px;
}
.qa-model .code-block {
  background: #0f172a; color: #e2e8f0;
  font-family: 'JetBrains Mono', 'DM Mono', monospace;
  font-size: 12px; padding: 10px 14px; border-radius: 8px;
  margin: 6px 0; white-space: pre; border-left: 3px solid #059669;
}
.qa-reveal-btn {
  width: 100%; padding: 12px; border: none; border-radius: 8px;
  background: #2563eb; color: #fff; font-family: 'DM Sans', sans-serif;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background 0.15s; margin-top: 4px;
}
.qa-reveal-btn:hover { background: #1d4ed8; }
.qa-reveal-btn:disabled { background: #94a3b8; cursor: default; }

.prog-complete-btn {
  width: 100%; padding: 13px; border: none; border-radius: 8px;
  font-family: 'DM Sans', sans-serif; font-size: 14px; font-weight: 600;
  cursor: pointer; color: #fff; margin-top: 16px;
  transition: filter 0.15s;
}
.prog-complete-btn:hover { filter: brightness(1.1); }

/* -- Multiple choice questions (shared base styles) -- */
.qa-item-mc {
  display: block;
  padding: 18px 20px;
  background: #f8fafc;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  margin-bottom: 14px;
}
.qa-item-mc .qa-question {
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 12px;
}
.qa-item-mc .qa-question .q-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #2563eb;
  margin-bottom: 6px;
}
.mc-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.mc-option {
  padding: 12px 14px;
  background: #fff;
  border: 1.5px solid #e2e8f0;
  border-radius: 8px;
  text-align: left;
  font-family: 'DM Sans', sans-serif;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.mc-option .mc-letter {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: #64748b;
  background: #f1f5f9;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}
.mc-option:hover:not(:disabled) {
  border-color: #2563eb;
  background: #eff6ff;
}
.mc-option:disabled { cursor: default; opacity: 0.7; }
.mc-option.correct {
  border-color: #059669;
  background: #d1fae5;
  color: #14532d;
  font-weight: 600;
  opacity: 1;
}
.mc-option.correct .mc-letter {
  background: #059669;
  color: #fff;
}
.mc-option.incorrect {
  border-color: #dc2626;
  background: #fee2e2;
  color: #7f1d1d;
  opacity: 1;
}
.mc-option.incorrect .mc-letter {
  background: #dc2626;
  color: #fff;
}
.mc-explanation {
  display: none;
  margin-top: 12px;
  padding: 12px 14px;
  background: #d1fae5;
  border-radius: 8px;
  border-left: 3px solid #059669;
  font-size: 13px;
  line-height: 1.5;
  color: #14532d;
}
.mc-explanation.visible { display: block; }
.mc-explanation-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #059669;
  margin-bottom: 4px;
}

@media (max-width: 720px) {
  .mc-options { grid-template-columns: 1fr; }
}