/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #1a1a2e;
  --bg-panel: #16213e;
  --bg-code: #0f0f23;
  --text: #e0e0e0;
  --text-dim: #8888aa;
  --accent: #4fc3f7;
  --accent-hover: #81d4fa;
  --border: #2a2a4a;
  --tab-active: #4fc3f7;
  --tab-inactive: #3a3a5a;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'SF Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
}

body {
  display: flex;
  flex-direction: column;
}

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

/* --- Header --- */
header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left h1 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.tagline {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.header-links {
  margin-left: auto;
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 0.5rem;
}

.tab {
  background: var(--tab-inactive);
  color: var(--text);
  border: none;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font);
}

.tab:hover { background: var(--border); }
.tab.active { background: var(--tab-active); color: #111; font-weight: 600; }

/* --- Main layout --- */
main {
  flex: 1;
  display: flex;
  min-height: 0;
}

#map {
  flex: 7;
  min-width: 0;
}

aside#panel {
  flex: 3;
  min-width: 280px;
  max-width: 400px;
  overflow-y: auto;
  padding: 1rem;
  border-left: 1px solid var(--border);
  background: var(--bg-panel);
}

/* --- Panel content --- */
.panel-content h2 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.field {
  margin-bottom: 0.75rem;
}

.field label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 0.2rem;
}

.mono {
  font-family: var(--mono);
  font-size: 0.85rem;
}

/* --- Code blocks --- */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 0.5rem;
  color: var(--text);
}

.code-block .str { color: #a5d6a7; }
.code-block .num { color: #ffcc80; }
.code-block .kw { color: #ce93d8; }

/* --- Controls --- */
input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

input[type="number"] {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  padding: 0.3rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  width: 100%;
}

select {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  padding: 0.3rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.btn {
  background: var(--tab-inactive);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.btn:hover { background: var(--border); }

.btn-finish {
  background: #1a3a1a;
  border-color: #66bb6a;
  color: #66bb6a;
  margin-left: 0.5rem;
}

.btn-finish:hover {
  background: #2a4a2a;
}

.btn-clear {
  background: #4a1a1a;
  border-color: #ef5350;
  color: #ef5350;
  width: 100%;
  margin-top: 1rem;
}

.btn-clear:hover {
  background: #6a2a2a;
}

#cover-drawing {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

/* --- Button groups --- */
.btn-group {
  display: flex;
  gap: 0.25rem;
}

.btn-sm {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  margin-top: 0;
  border-radius: 4px;
}

.btn-sm.active {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
  font-weight: 600;
}

.btn-sm.toggled {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
}

/* --- Scrollable code blocks --- */
.code-block-scroll {
  max-height: 150px;
  overflow-y: auto;
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* --- Utility --- */
.hidden { display: none !important; }

/* --- Responsive (mobile: stack vertically) --- */
@media (max-width: 768px) {
  header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  main {
    flex-direction: column;
  }

  #map {
    flex: none;
    height: 50vh;
  }

  aside#panel {
    flex: none;
    max-width: none;
    border-left: none;
    border-top: 1px solid var(--border);
  }
}