.mission-shell { display: grid; grid-template-columns: 220px minmax(0, 800px); gap: 48px; padding-block: 48px 85px; }
.mission-sidebar { position: sticky; top: 100px; align-self: start; }
.back-link { display: inline-block; margin-bottom: 28px; color: var(--muted); font-size: 13px; text-decoration: none; }
.back-link:hover { color: var(--accent); }
.mission-sidebar ol { margin: 0 0 20px; padding: 0; list-style: none; }
.mission-sidebar ol a { display: grid; grid-template-columns: 25px 1fr; gap: 8px; padding: 7px 0; color: var(--muted); font-size: 12px; text-decoration: none; }
.mission-sidebar ol a[aria-current="step"], .mission-sidebar a:hover { color: var(--text); }
.mission-sidebar ol a[data-complete="true"] .side-number { color: var(--accent); }
.side-number { font-family: var(--mono); }
.mission-content { min-width: 0; }
.mission-hero { padding: 12px 0 40px; border-bottom: 1px solid var(--border); }
.mission-hero h1 { margin: 0 0 16px; font-size: clamp(38px, 6vw, 65px); line-height: 1; letter-spacing: -.055em; }
.mission-hero .lead { max-width: 700px; }
.lesson-panel { margin-top: 18px; padding: 26px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.lesson-panel h2 { margin: 0 0 10px; font-size: 24px; letter-spacing: -.035em; }
.lesson-panel h3 { margin: 22px 0 7px; }
.lesson-panel > p:last-child { margin-bottom: 0; }
.lesson-panel p, .lesson-panel li { color: var(--muted); }
.lesson-panel strong { color: var(--text); }
.split-panel { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.concept-list { display: grid; gap: 8px; padding-left: 20px; }
.note { padding: 14px 16px; border-left: 3px solid var(--accent); background: var(--accent-dark); color: #c7e8d4 !important; }
.code-block { overflow-x: auto; margin: 18px 0 0; padding: 18px; border: 1px solid #26343d; border-radius: var(--radius-sm); background: #070b0f; color: #d4e7da; font: 13px/1.7 var(--mono); white-space: pre; }
.quiz-options { display: grid; gap: 9px; margin-top: 18px; }
.quiz-option { width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; background: var(--surface-2); color: var(--text); text-align: left; cursor: pointer; }
.quiz-option:hover { border-color: #5a7467; }
.quiz-option.is-correct { border-color: var(--success); background: #143024; }
.quiz-option.is-wrong { border-color: var(--error); background: #321b1d; }
.quiz-actions, .form-actions, .toolbar, .mission-pager { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.quiz-actions { margin-top: 14px; }
.sequence-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; margin-top: 16px; }
.sequence-list { min-height: 75px; margin: 15px 0; padding: 15px 15px 15px 38px; border: 1px dashed #41505a; border-radius: var(--radius-sm); color: var(--muted); }
.demo-dashboard { display: grid; grid-template-columns: 150px 1fr; min-height: 270px; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius); background: #0b1117; transition: max-width .2s ease; }
.demo-dashboard.is-narrow { grid-template-columns: 1fr; max-width: 350px; }
.demo-dashboard.is-narrow .demo-sidebar { display: none; }
.demo-sidebar { padding: 18px; background: #15212a; }
.demo-sidebar strong { color: var(--accent); }
.demo-main { padding: 18px; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.stat { padding: 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface-2); }
.stat strong { display: block; font: 700 20px var(--mono); }
.stat span { color: var(--muted); font-size: 11px; }
.check-list { display: grid; gap: 8px; margin-block: 15px; }
.check-list label { display: flex; gap: 9px; align-items: flex-start; color: var(--muted); }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.field { display: grid; gap: 6px; }
.field-full { grid-column: 1 / -1; }
label, .field-label { color: var(--text); font-size: 13px; font-weight: 700; }
input, select { width: 100%; min-height: 44px; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 9px 11px; background: #0b1117; color: var(--text); }
input::placeholder { color: #6f7d79; }
.table-scroll { overflow-x: auto; margin-top: 18px; }
.data-table { width: 100%; min-width: 580px; border-collapse: collapse; }
.data-table caption { margin-bottom: 10px; color: var(--muted); text-align: left; }
.data-table th, .data-table td { padding: 13px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.data-table th { color: var(--muted); font: 600 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.data-table tbody tr:hover { background: var(--surface-2); }
.difficulty-easy { color: var(--success); }
.difficulty-medium { color: var(--warning); }
.difficulty-hard { color: var(--error); }
.empty-state { padding: 28px; border: 1px dashed var(--border); border-radius: var(--radius-sm); color: var(--muted); text-align: center; }
.article-grid { display: grid; gap: 10px; margin-top: 18px; }
.article-card { padding: 20px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface-2); }
.article-card h3 { margin: 0 0 6px; font-size: 17px; }
.article-meta { margin: 0 0 15px; color: var(--muted); font-size: 12px; }
.article-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.article-actions a { color: var(--accent); font-weight: 750; text-underline-offset: 4px; }
.review-box { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); }
.mission-pager { justify-content: space-between; margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--border); }
.mission-pager a { color: var(--muted); font-size: 13px; }
.mission-pager a:hover { color: var(--accent); }
noscript { display: block; padding: 13px; background: #342318; color: #ffd9a3; }

@media (max-width: 820px) {
  .mission-shell { grid-template-columns: 1fr; gap: 25px; }
  .mission-sidebar { position: static; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
  .mission-sidebar ol { display: none; }
}
@media (max-width: 600px) {
  .split-panel, .form-grid, .sequence-options, .stats-grid { grid-template-columns: 1fr; }
  .field-full { grid-column: auto; }
  .lesson-panel { padding: 20px; }
  .demo-dashboard { grid-template-columns: 1fr; }
  .demo-sidebar { display: none; }
}