:root {
  --bg: #0e0d0b;
  --bg-card: #1a1816;
  --bg-elev: #232020;
  --fg: #f1ece4;
  --muted: #9c9183;
  --accent: #b1281f;
  --accent-hover: #d63326;
  --accent-soft: rgba(177, 40, 31, 0.12);
  --border: #2a2622;
  --kbd-bg: #2d2722;
  --good: #6abf6a;
  --bad: #e57373;
  --warn: #e6b35a;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.logo {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 1.6rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  letter-spacing: -0.05em;
}

header h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.tagline {
  color: var(--muted);
  max-width: 640px;
  margin: 0.75rem auto 0;
  font-size: 1.05rem;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card.disabled { opacity: 0.45; pointer-events: none; }
.card.disabled .primary { cursor: not-allowed; }

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
}

.steps {
  padding-left: 1.25rem;
  margin: 0.5rem 0;
}
.steps li { margin-bottom: 0.4rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  background: var(--bg-elev);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

kbd {
  background: var(--kbd-bg);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  padding: 0.1em 0.45em;
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
}

button {
  background: var(--bg-elev);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.6em 1.2em;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  font-family: inherit;
}
button:hover:not(:disabled) { background: #2f2a25; }

button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
button.primary:hover:not(:disabled) { background: var(--accent-hover); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

button.link {
  background: none;
  border: none;
  color: var(--accent);
  padding: 0;
  font-weight: 500;
  text-decoration: underline;
  cursor: pointer;
}

.status {
  margin-top: 0.75rem;
  padding: 0.6rem 0.85rem;
  background: #0a0908;
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
}

progress {
  width: 100%;
  height: 6px;
  margin-top: 0.5rem;
  appearance: none;
  -webkit-appearance: none;
  border: none;
  border-radius: 3px;
  background: var(--bg-elev);
  overflow: hidden;
}
progress::-webkit-progress-bar { background: var(--bg-elev); }
progress::-webkit-progress-value { background: var(--accent); transition: width 0.2s; }
progress::-moz-progress-bar { background: var(--accent); }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  margin: 0.75rem 0;
  transition: all 0.15s ease;
  cursor: pointer;
}
.dropzone:hover, .dropzone:focus { border-color: var(--accent); outline: none; }
.dropzone.hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone p { margin: 0.25rem 0; }

.muted { color: var(--muted); font-size: 0.9rem; }
.center { text-align: center; }

#screen-container {
  margin-top: 0.75rem;
  background: black;
  border-radius: 6px;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

#screen { width: 100%; }
#canvas {
  display: block;
  max-width: 100%;
  background: black;
}
#canvas:focus { outline: 2px solid var(--accent); outline-offset: -2px; }

#screen-empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  color: #555;
  font-style: italic;
}
#screen-container.has-content #screen-empty-state { display: none; }

#logOutput {
  background: #08070a;
  color: #d4ccbe;
  padding: 1rem;
  border-radius: 6px;
  font-size: 0.78rem;
  max-height: 240px;
  overflow-y: auto;
  margin: 0;
  white-space: pre-wrap;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  border: 1px solid var(--border);
}

details {
  margin: 0.5rem 0;
  padding: 0.6rem 0.85rem;
  background: #100f0d;
  border-radius: 6px;
  border: 1px solid var(--border);
}
details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--fg);
  list-style: none;
}
details summary::-webkit-details-marker { display: none; }
details summary::before {
  content: "›";
  display: inline-block;
  margin-right: 0.5rem;
  transition: transform 0.15s ease;
  color: var(--accent);
}
details[open] summary::before { transform: rotate(90deg); }
details p, details ul { color: var(--muted); margin: 0.5rem 0 0; }
details ul { padding-left: 1.25rem; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
  padding: 2rem 1rem 2.5rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

@media (max-width: 540px) {
  header { padding: 1.5rem 1rem 1rem; }
  header h1 { font-size: 1.8rem; }
  .card { padding: 1.1rem; }
  h2 { font-size: 1.05rem; }
}