:root {
  /* Palette derived from Trails of Ethiopia logo */
  --brand-green: #2f9e2f;
  --brand-green-dark: #227a22;
  --brand-brown: #5a2a1a;
  --brand-orange: #f2a71b;
  --brand-orange-dark: #d18f0d;
  --bg: #faf6ef;
  --surface: #ffffff;
  --text: #2a1a10;
  --muted: #7a6a5f;
  --border: #e6ddd0;
  --shadow: 0 4px 14px rgba(90, 42, 26, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Toolbar */
.toolbar {
  background: linear-gradient(135deg, var(--brand-green) 0%, var(--brand-green-dark) 100%);
  color: #fff;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; }
.logo {
  height: 42px;
  width: auto;
  background: #fff;
  padding: 4px 8px;
  border-radius: 8px;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  flex: 1;
  justify-content: flex-end;
}

.group {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.12);
  padding: 4px;
  border-radius: 10px;
}

.btn {
  background: var(--brand-orange);
  color: var(--brand-brown);
  border: none;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
  min-height: 42px;
  min-width: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover:not(:disabled) {
  background: var(--brand-brown);
  color: #fff;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-file {
  background: #fff;
  color: var(--brand-green-dark);
}
.btn-file:hover { background: var(--brand-orange); color: var(--brand-brown); }

.page-info, .zoom-info {
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 6px;
}

#pageNum {
  width: 56px;
  padding: 6px 8px;
  border-radius: 6px;
  border: none;
  text-align: center;
  font-weight: 600;
  color: var(--brand-brown);
}

/* Viewer */
.viewer {
  flex: 1;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: auto;
}

.canvas-wrap {
  background: var(--surface);
  box-shadow: var(--shadow);
  border-radius: 8px;
  padding: 8px;
  max-width: 100%;
  position: relative;
  min-height: 200px;
  min-width: 200px;
}

#pdfCanvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.empty-state {
  padding: 40px 24px;
  text-align: center;
  color: var(--muted);
}
.empty-state img { height: 100px; margin-bottom: 12px; }
.empty-state h2 { margin: 8px 0; color: var(--brand-brown); }

.empty-state[hidden] { display: none; }

/* Mobile */
@media (max-width: 640px) {
  .toolbar { padding: 8px; gap: 8px; }
  .logo { height: 36px; }
  .controls { justify-content: center; width: 100%; }
  .btn { padding: 10px 12px; font-size: 14px; }
  .viewer { padding: 10px; }
}

.status {
  padding: 40px 24px;
  text-align: center;
  color: var(--muted);
  line-height: 1.5;
}
.status.error { color: var(--brand-brown); }
.status[hidden] { display: none; }