:root {
  --linux-green: #5cff86;
  --linux-green-deep: #123b26;
  --linux-cyan: #00f7ff;
  --linux-gold: #ffd700;
  --linux-panel: rgba(7, 13, 25, 0.94);
  --linux-border: rgba(92, 255, 134, 0.55);
}

.linux-labs-body {
  min-height: 100vh;
  overflow-x: hidden;
}

.linux-labs-shell .hidden {
  display: none !important;
}

.linux-labs-shell {
  width: min(100% - 32px, 1120px);
  margin: 0 auto;
  padding: 32px 0 48px;
  position: relative;
  z-index: 1;
}

.linux-labs-hero {
  text-align: center;
  margin-bottom: 24px;
}

.linux-labs-hero > p:not(.tagline) {
  max-width: 760px;
  margin: 14px auto 0;
}

.linux-labs-dashboard,
.linux-lesson-status,
.linux-labs-panel,
.linux-terminal-panel,
.linux-kingdom-heading {
  border: 2px solid var(--linux-border);
  background: var(--linux-panel);
  box-shadow: 0 0 22px rgba(92, 255, 134, 0.12);
}

.linux-labs-dashboard,
.linux-lesson-status {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.7fr);
  gap: 24px;
  align-items: center;
  padding: 22px;
  margin-bottom: 24px;
}

.linux-labs-label,
.linux-mission-number {
  display: block;
  color: var(--linux-green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.linux-labs-progress {
  display: grid;
  gap: 8px;
}

.linux-labs-progress progress {
  width: 100%;
  height: 16px;
  accent-color: var(--linux-green);
}

.linux-kingdom-heading {
  padding: 20px;
  border-bottom: 0;
}

.linux-mission-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.linux-mission-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  padding: 22px;
  border: 2px solid var(--linux-border);
  background: linear-gradient(145deg, rgba(12, 27, 36, 0.98), rgba(8, 11, 24, 0.98));
}

.linux-mission-card h3,
.linux-mission-card p {
  overflow-wrap: anywhere;
}

.linux-mission-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: auto 0 4px;
}

.linux-mission-meta div {
  min-width: 0;
  padding: 10px;
  background: rgba(0, 0, 0, 0.28);
}

.linux-mission-meta dt {
  color: #a8b8c8;
  font-size: 0.75rem;
}

.linux-mission-meta dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
}

.linux-action-button,
.linux-secondary-button {
  display: inline-flex;
  min-height: 44px;
  padding: 10px 16px;
  border: 2px solid var(--linux-green);
  align-items: center;
  justify-content: center;
  background: var(--linux-green-deep);
  color: #fff;
  font: inherit;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.linux-secondary-button {
  border-color: var(--linux-cyan);
  background: rgba(0, 80, 90, 0.28);
}

.linux-action-button:hover,
.linux-action-button:focus-visible,
.linux-secondary-button:hover,
.linux-secondary-button:focus-visible,
.linux-terminal-command input:focus-visible,
.linux-terminal-command button:focus-visible,
.linux-command-example:focus-visible {
  outline: 3px solid var(--linux-gold);
  outline-offset: 3px;
}

.linux-action-button:disabled,
.linux-secondary-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.linux-lesson-status {
  margin-bottom: 18px;
}

.linux-labs-panel,
.linux-terminal-panel {
  padding: 24px;
}

.linux-lesson-panel {
  min-height: 280px;
}

.linux-safety-note,
.linux-big-idea,
.linux-takeaway {
  margin-top: 20px;
  padding: 16px;
  border-left: 4px solid var(--linux-green);
  background: rgba(92, 255, 134, 0.08);
}

.linux-big-idea {
  border-left-color: var(--linux-gold);
  background: rgba(255, 215, 0, 0.08);
}

.linux-concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.linux-concept-card {
  padding: 16px;
  border: 1px solid rgba(0, 247, 255, 0.45);
  background: rgba(0, 0, 0, 0.25);
}

.linux-concept-badge {
  display: block;
  margin-bottom: 8px;
  color: var(--linux-gold);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.linux-concept-card code,
.linux-command-example code,
.linux-terminal-help code {
  color: var(--linux-green);
  font-family: Consolas, "Courier New", monospace;
}

.linux-command-example {
  max-width: 100%;
  padding: 16px;
  overflow-x: auto;
  border: 1px solid var(--linux-green);
  background: #020706;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.linux-step-dots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
  margin-top: 20px;
  padding: 0;
  list-style-position: inside;
}

.linux-step-dots li {
  padding: 10px;
  border: 1px solid #526175;
}

.linux-step-dots .is-current {
  border-color: var(--linux-gold);
  color: var(--linux-gold);
}

.linux-step-dots .is-viewed {
  border-color: var(--linux-green);
}

.linux-terminal-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.linux-terminal-mode {
  padding: 8px 12px;
  border: 1px solid var(--linux-gold);
  color: var(--linux-gold);
}

.linux-terminal-workspace {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.65fr);
  gap: 18px;
  align-items: stretch;
}

.linux-terminal-guide {
  padding: 18px;
  border: 2px solid rgba(0, 247, 255, 0.48);
  background: rgba(0, 40, 48, 0.22);
}

.linux-terminal-guide h3 {
  margin-top: 8px;
}

.linux-terminal-guide ol {
  display: grid;
  gap: 10px;
  padding-left: 22px;
}

.linux-terminal-guide li {
  padding-left: 4px;
}

.linux-terminal-guide-note {
  margin-bottom: 0;
  padding: 12px;
  border-left: 3px solid var(--linux-gold);
  background: rgba(255, 215, 0, 0.07);
}

.linux-progressive-hints {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.linux-progressive-hints .linux-secondary-button {
  width: 100%;
}

.linux-hint-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 2px solid var(--linux-gold);
  background: rgba(255, 215, 0, 0.07);
}

.linux-hint-panel:focus-visible {
  outline: 3px solid var(--linux-cyan);
  outline-offset: 3px;
}

.linux-hint-level + .linux-hint-level {
  padding-top: 10px;
  border-top: 1px solid rgba(255, 215, 0, 0.35);
}

.linux-hint-level p {
  margin: 6px 0 0;
}

.linux-terminal-guide code {
  color: var(--linux-green);
}

.linux-terminal {
  border: 2px solid #416d50;
  border-radius: 4px;
  background: #020604;
  color: #e6ffed;
  font-family: Consolas, "Courier New", monospace;
}

.linux-terminal-output {
  height: 300px;
  padding: 16px;
  overflow: auto;
  overscroll-behavior: contain;
}

.linux-terminal-output p,
.linux-terminal-output pre {
  margin: 0 0 8px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.linux-terminal-system {
  color: #9bc5a7;
}

.linux-terminal-entry-prompt {
  color: var(--linux-green);
}

.linux-terminal-error {
  color: #ff9b9b;
}

.linux-terminal-command {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid #416d50;
}

.linux-terminal-command label {
  color: var(--linux-green);
  white-space: nowrap;
}

.linux-terminal-command input {
  min-width: 0;
  min-height: 44px;
  border: 1px solid #608d6d;
  padding: 8px;
  background: #07110a;
  color: #fff;
  font: inherit;
}

.linux-terminal-command button {
  min-height: 44px;
  border: 1px solid var(--linux-green);
  padding: 8px 12px;
  background: var(--linux-green-deep);
  color: #fff;
  font: inherit;
  cursor: pointer;
}

.linux-terminal-help {
  margin-bottom: 0;
  color: #b6c5d1;
}

.linux-practice-controls,
.linux-lesson-controls,
.linux-next-actions,
.linux-lab-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.linux-lesson-controls {
  justify-content: space-between;
}

.linux-feedback {
  margin-top: 18px;
  padding: 16px;
  border: 2px solid currentColor;
}

.linux-feedback.is-correct {
  color: var(--linux-green);
  background: rgba(92, 255, 134, 0.08);
}

.linux-feedback.is-incorrect {
  color: #ffb1b1;
  background: rgba(255, 80, 80, 0.08);
}

.linux-wolf-tip {
  margin-top: 20px;
  padding: 18px;
  border: 2px solid var(--linux-gold);
  background: rgba(255, 215, 0, 0.08);
}

.linux-graduation-badge {
  display: grid;
  gap: 6px;
  max-width: 520px;
  margin: 0 auto 24px;
  padding: 20px;
  border: 2px solid var(--linux-gold);
  background: rgba(255, 215, 0, 0.08);
  color: var(--linux-gold);
  text-align: center;
  letter-spacing: 0.08em;
}

.linux-graduation-badge strong {
  font-size: clamp(1.25rem, 4vw, 2rem);
}

.linux-graduation-badge span {
  color: #fff;
  font-weight: 700;
}

.linux-guide-name {
  display: block;
  font-size: 1.15rem;
  letter-spacing: 0.08em;
}

.linux-guide-title {
  display: block;
  margin-top: 3px;
  color: var(--linux-gold);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.linux-guide-advice {
  margin-top: 16px;
  padding: 14px;
  border: 2px solid var(--linux-green);
  background: rgba(92, 255, 134, 0.08);
  box-shadow: inset 0 0 14px rgba(92, 255, 134, 0.06);
}

.linux-guide-category {
  display: inline-block;
  color: var(--linux-green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.linux-guide-advice p {
  margin: 10px 0 0;
}

.linux-lab-footer {
  justify-content: space-between;
  padding: 20px 0;
}

.linux-lab-footer .back-link,
.linux-labs-shell > .arcade-footer .back-link {
  display: inline-flex;
  min-height: 44px;
  padding: 10px 12px;
  align-items: center;
  justify-content: center;
}

.linux-screen-reader-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 760px) {
  .linux-labs-dashboard,
  .linux-lesson-status,
  .linux-mission-grid {
    grid-template-columns: 1fr;
  }

  .linux-mission-meta {
    grid-template-columns: 1fr;
  }

  .linux-terminal-command {
    grid-template-columns: 1fr;
  }

  .linux-terminal-workspace {
    grid-template-columns: 1fr;
  }

  .linux-terminal-command label {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .linux-terminal-heading {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .linux-labs-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 18px;
  }

  .linux-labs-panel,
  .linux-terminal-panel,
  .linux-labs-dashboard,
  .linux-lesson-status,
  .linux-kingdom-heading,
  .linux-mission-card {
    padding: 16px;
  }

  .linux-practice-controls > *,
  .linux-lesson-controls > *,
  .linux-next-actions > *,
  .linux-lab-footer > * {
    width: 100%;
  }

  .linux-terminal-output {
    height: 250px;
  }
}