:root {
  color-scheme: light dark;
  --lab-bg: #f7f7f4;
  --lab-surface: #ffffff;
  --lab-text: #20211f;
  --lab-muted: #666a63;
  --lab-line: #d9ddd2;
  --lab-accent: #116466;
  --lab-accent-dark: #0b4546;
  --lab-danger: #a33434;
  --lab-success: #1d6b3a;
  --lab-radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  max-width: none;
  background: var(--lab-bg);
  color: var(--lab-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

select,
textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 18%);
  color: var(--lab-text);
}

select {
  min-height: 42px;
}

textarea {
  min-height: 96px;
  resize: vertical;
}

select:focus,
textarea:focus {
  border-color: var(--lab-accent);
  outline: 3px solid color-mix(in srgb, var(--lab-accent), transparent 78%);
}

.crypto-tools {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.crypto-tool {
  min-width: 0;
  max-width: 100%;
  padding: 18px;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 20%);
}

.crypto-tool h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.2;
}

.stego-input-label {
  display: block;
  margin-top: 18px;
  color: var(--lab-muted);
  font-size: 0.9rem;
  font-weight: 650;
}

.stego-input {
  width: min(100%, 400px);
  margin-top: 6px;
}

.stego-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.stego-actions .lab-button {
  min-height: 30px;
  padding: 4px 9px;
  font-size: 0.75rem;
}

.stego-results {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  margin-top: 16px;
}

.stego-byte {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  padding: 6px 8px;
  border: 1px solid var(--lab-line);
  border-radius: 6px;
  background: #0c0c0e;
  color: #e4e4e7;
  font: 0.82rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.stego-byte-meta,
.stego-bits {
  display: flex;
  align-items: center;
  min-width: 0;
}

.stego-byte-meta {
  flex: 0 1 auto;
  gap: 10px;
}

.stego-index,
.stego-decimal {
  color: #71717a;
}

.stego-character {
  color: #f43f5e;
  font-weight: 700;
}

.stego-hex {
  color: #a1a1aa;
}

.stego-bits {
  flex: 0 0 auto;
  gap: 2px;
}

.stego-bit {
  display: inline-block;
  width: 20px;
  height: 26px;
  padding: 2px 0;
  border: 1px solid #3f3f46;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.05);
  color: #e4e4e7;
  cursor: pointer;
  font: inherit;
  line-height: 20px;
  text-align: center;
  transition: transform 0.1s ease, background 0.15s ease;
}

.stego-bit:hover {
  transform: translateY(-1px);
}

.stego-bit:focus-visible {
  outline: 2px solid var(--lab-accent);
  outline-offset: 2px;
}

.stego-bit--lsb {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}

.stego-lsb {
  margin-top: 16px;
  padding: 8px 12px;
  border: 1px solid var(--lab-line);
  border-radius: 6px;
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 18%);
  font: 0.8rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.stego-lsb-label {
  color: var(--lab-muted);
}

.stego-lsb-stream {
  overflow-wrap: anywhere;
  color: #22c55e;
}

.stego-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.stego-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--lab-muted);
}

.stego-metrics strong {
  color: #38bdf8;
}

#stego-hamming-distance {
  color: #71717a;
}

header {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 2rem 0;
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: 2rem;
  font-weight: 600;
  color: var(--lab-text);
}

header .subtitle {
  margin: 0;
  color: var(--lab-muted);
  font-size: 1.05rem;
}

header nav {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.95rem;
}

header .site-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
  align-items: center;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

header .site-links a {
  color: var(--lab-accent);
  text-decoration: none;
}

header nav a {
  color: var(--lab-muted);
  margin-right: 1rem;
  font-weight: 500;
  text-decoration: none;
}

header nav a:hover,
header nav a.active {
  color: var(--lab-accent);
}

.lab-shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0;
}

.lab-hero {
  max-width: 720px;
  margin-bottom: 28px;
}

.lab-kicker,
.lab-eyebrow {
  margin: 0 0 6px;
  color: var(--lab-accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.lab-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 3.2rem, 3.8rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.lab-intro {
  max-width: 640px;
  margin: 18px 0 0;
  color: var(--lab-muted);
  font-size: 1.05rem;
}

.lab-filter-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 18px;
  padding: 10px 0;
  background: var(--lab-bg);
}

.lab-filter-btn {
  border-radius: 999px;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.lab-panel {
  min-width: 0;
  padding: 22px;
  background: var(--lab-surface);
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
}

.lab-panel--wide {
  grid-column: 1 / -1;
}

.lorenz-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.lorenz-step-counter {
  color: var(--lab-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.lorenz-canvas-wrap {
  display: flex;
  justify-content: center;
  min-width: 0;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  background: #0a0a0c;
}

#lorenz-canvas {
  display: block;
  width: 100%;
  max-width: min(600px, 100%);
  min-width: 0;
  height: auto;
  aspect-ratio: 600 / 380;
  touch-action: none;
}

@media (max-width: 560px) {
  .lorenz-canvas-wrap {
    margin-inline: -1px;
  }

  #lorenz-canvas {
    width: 100%;
  }
}

.lab-panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.lab-panel h2 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.2;
}

.lab-info-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.lab-info-list div {
  display: grid;
  grid-template-columns: minmax(96px, 0.35fr) minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--lab-line);
}

.lab-info-list div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.lab-info-list dt {
  color: var(--lab-muted);
  font-size: 0.9rem;
  font-weight: 650;
}

.lab-info-list dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.lab-muted {
  margin: 0 0 18px;
  color: var(--lab-muted);
}

.status-badge {
  flex: 0 0 auto;
  min-width: 88px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--lab-line);
  color: var(--lab-muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-align: center;
}

.lab-health-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.status-badge--ok {
  border-color: color-mix(in srgb, var(--lab-success), transparent 60%);
  color: var(--lab-success);
  background: color-mix(in srgb, var(--lab-success), transparent 92%);
}

.status-badge--error {
  border-color: color-mix(in srgb, var(--lab-danger), transparent 60%);
  color: var(--lab-danger);
  background: color-mix(in srgb, var(--lab-danger), transparent 92%);
}

.lab-form {
  display: grid;
  gap: 12px;
}

.lab-form label {
  display: grid;
  gap: 6px;
  color: var(--lab-muted);
  font-size: 0.95rem;
  font-weight: 650;
}

.lab-form [hidden] {
  display: none;
}

.lab-inline,
.lab-actions,
.lab-auth-grid {
  display: grid;
  gap: 10px;
}

.lab-inline {
  grid-template-columns: minmax(0, 1fr) auto;
}

.lab-auth-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

input {
  width: 100%;
  min-height: 42px;
  padding: 9px 11px;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 18%);
  color: var(--lab-text);
}

input:focus {
  border-color: var(--lab-accent);
  outline: 3px solid color-mix(in srgb, var(--lab-accent), transparent 78%);
}

.lab-button {
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid var(--lab-accent);
  border-radius: var(--lab-radius);
  background: var(--lab-accent);
  color: #ffffff;
  cursor: pointer;
  font-weight: 750;
}

.lab-button--compact {
  min-height: 34px;
  padding: 6px 10px;
  font-size: 0.82rem;
}

.lab-button:hover {
  background: var(--lab-accent-dark);
  border-color: var(--lab-accent-dark);
}

.lab-button:disabled {
  cursor: progress;
  opacity: 0.7;
}

.lab-button--secondary {
  background: transparent;
  color: var(--lab-accent);
}

.lab-button--secondary:hover {
  background: color-mix(in srgb, var(--lab-accent), transparent 92%);
  color: var(--lab-accent-dark);
}

.lab-actions {
  grid-template-columns: auto auto;
  justify-content: start;
}

.lab-result {
  display: block;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  min-height: 46px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  color: var(--lab-muted);
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 28%);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.lab-result strong {
  color: var(--lab-text);
}

.lab-telemetry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  margin-top: 6px;
  padding: 3px 7px;
  border: 1px solid var(--lab-line);
  border-radius: 6px;
  background: color-mix(in srgb, var(--lab-surface), var(--lab-bg) 18%);
  color: var(--lab-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
}

.telemetry-meta {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 6px;
  overflow: hidden;
  white-space: nowrap;
}

.telemetry-icon {
  flex: 0 0 auto;
  color: var(--lab-accent);
}

.telemetry-separator {
  flex: 0 0 auto;
  color: var(--lab-line);
}

.telemetry-path {
  min-width: 0;
  overflow: hidden;
  color: var(--lab-text);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.curl-copy-btn {
  flex: 0 0 auto;
  padding: 2px 6px;
  border: 1px solid var(--lab-line);
  border-radius: 4px;
  background: transparent;
  color: var(--lab-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  transition: color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.curl-copy-btn:hover,
.curl-copy-btn--copied {
  border-color: var(--lab-accent);
  color: var(--lab-accent);
}

.curl-copy-btn:focus-visible {
  outline: 2px solid var(--lab-accent);
  outline-offset: 2px;
}

/* Keep the telemetry text and copy control readable on narrow screens. */
@media (max-width: 560px) {
  .crypto-tools {
    grid-template-columns: minmax(0, 1fr);
  }

  .stego-byte {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .lab-telemetry {
    gap: 8px;
  }

  .telemetry-meta {
    gap: 4px;
  }
}

.lab-code {
  min-height: 150px;
  max-height: 420px;
  overflow: auto;
  margin: 16px 0 0;
  padding: 14px;
  border: 1px solid var(--lab-line);
  border-radius: var(--lab-radius);
  background: #171b1a;
  color: #f4f7f2;
  font: 0.92rem/1.5 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  white-space: pre-wrap;
}

@media (prefers-color-scheme: dark) {
  :root {
    --lab-bg: #111413;
    --lab-surface: #191d1b;
    --lab-text: #f2f5ef;
    --lab-muted: #b0b7ac;
    --lab-line: #313830;
    --lab-accent: #55b6a9;
    --lab-accent-dark: #7acbc0;
  }
}

@media (max-width: 720px) {
  .lab-shell {
    width: min(100% - 24px, 1040px);
    padding: 36px 0;
  }

  .lab-grid,
  .crypto-tools,
  .lab-auth-grid,
  .lab-inline,
  .lab-actions {
    grid-template-columns: 1fr;
  }

  .lab-panel {
    padding: 18px;
  }

  .lab-panel-heading {
    align-items: flex-start;
  }
}

footer {
  width: min(1040px, calc(100% - 32px));
  margin: 64px auto 0;
  padding: 2rem 0;
  border-top: 1px solid var(--lab-line);
  text-align: center;
}

footer p {
  margin: 0;
  color: var(--lab-muted);
  font-size: 0.9rem;
}