.portal-back { display: inline-flex; margin: 0 10px 18px; color: var(--muted); font: 750 11px var(--mono); text-decoration: none; text-transform: uppercase; }
.portal-back:hover { color: var(--ink); }
.brand-mark, .lesson-badge { background: var(--course-accent); }
.side-tip { background: var(--course-soft); }
.principles { background: var(--course-dark); }

.skill-visual { position: relative; width: 100%; max-width: 590px; min-width: 0; }
.skill-visual__back { position: absolute; inset: -18px 20px 20px -18px; border: 2px solid var(--ink); border-radius: 22px; background: var(--course-accent); transform: rotate(-4deg); }
.skill-visual__card { position: relative; min-height: 390px; padding: 24px; border: 2px solid var(--ink); border-radius: 18px; background: var(--white); box-shadow: 10px 12px 0 var(--ink); transform: rotate(1.5deg); }
.skill-visual__bar { display: flex; justify-content: space-between; gap: 16px; padding-bottom: 18px; border-bottom: 2px solid var(--ink); font: 800 11px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.skill-visual__rows { display: grid; gap: 13px; margin-top: 24px; }
.skill-visual__row { display: grid; grid-template-columns: 48px 1fr; align-items: center; gap: 14px; min-height: 62px; padding: 10px 14px; border: 2px solid var(--ink); border-radius: 11px; background: var(--paper); }
.skill-visual__row:nth-child(2) { margin-left: 20px; background: var(--course-soft); }
.skill-visual__row:nth-child(3) { margin-left: 40px; background: var(--lime); }
.skill-visual__row b { display: grid; place-items: center; width: 42px; height: 38px; border: 2px solid var(--ink); border-radius: 8px; background: var(--ink); color: white; font: 800 12px var(--mono); }
.skill-visual__row span { font-weight: 850; }
.skill-visual__sticker { position: absolute; right: -18px; bottom: -22px; display: grid; place-items: center; width: 100px; height: 100px; border: 2px solid var(--ink); border-radius: 50%; background: var(--course-accent); font: 900 12px/1.15 var(--mono); text-align: center; transform: rotate(-8deg); }

.practice-shell { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr) 260px; gap: 18px; margin-top: 34px; }
.practice-panel { min-width: 0; border: 2px solid var(--ink); border-radius: 14px; background: var(--white); box-shadow: 6px 6px 0 var(--ink); overflow: hidden; }
.practice-panel__bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 46px; padding: 9px 12px; border-bottom: 2px solid var(--ink); background: var(--paper-2); font: 800 10px var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.practice-panel__bar div { display: flex; gap: 7px; }
.practice-panel__bar button, .practice-presets button { padding: 6px 9px; border: 1.5px solid var(--ink); border-radius: 7px; background: var(--white); font: 750 10px var(--mono); cursor: pointer; }
.practice-panel__bar button.primary { background: var(--ink); color: white; }
.practice-editor { display: block; width: 100%; min-height: 400px; padding: 18px; border: 0; outline: 0; resize: vertical; background: #171916; color: #f7f3e8; font: 13px/1.7 var(--mono); tab-size: 2; }
.practice-editor:focus-visible { outline: 3px solid var(--blue); outline-offset: -5px; }
.practice-presets { display: flex; flex-wrap: wrap; gap: 7px; padding: 11px; border-top: 2px solid var(--ink); background: var(--paper-2); }
.practice-result { min-height: 450px; padding: 24px; }
.practice-result h2 { margin: 0 0 18px; font-size: 28px; line-height: 1.05; }
.practice-result ul { padding-left: 20px; }
.practice-result li { margin: 9px 0; }
.practice-preview { margin-top: 22px; padding: 18px; border: 2px solid var(--ink); border-radius: 11px; background: var(--course-soft); overflow-x: auto; }
.practice-preview table { font-size: 12px; }
.practice-preview .chart-bars { display: flex; align-items: end; gap: 12px; min-height: 220px; padding-top: 24px; }
.practice-preview .chart-bar { display: flex; flex: 1; flex-direction: column; justify-content: end; min-width: 42px; text-align: center; }
.practice-preview .chart-bar__fill { min-height: 4px; border: 2px solid var(--ink); background: var(--course-accent); }
.practice-preview .chart-bar b, .practice-preview .chart-bar span { margin-top: 6px; font: 700 10px var(--mono); }

@media (max-width: 1180px) {
  .practice-shell { grid-template-columns: 1fr 1fr; }
  .practice-shell .lab-guide { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .skill-visual { max-width: calc(100vw - 54px); margin-inline: auto; }
  .skill-visual__row:nth-child(2), .skill-visual__row:nth-child(3) { margin-left: 0; }
  .practice-shell { grid-template-columns: 1fr; }
  .practice-shell .lab-guide { grid-column: auto; order: -1; }
  .practice-editor { min-height: 330px; }
}