:root {
  --bg: #0f1115;
  --panel: #171a21;
  --line: #2a2f3a;
  --text: #e7e9ee;
  --muted: #9aa1ad;
  --accent: #4f8cff;
  --accent-2: #ff5d5d;
  --ok: #41d18a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  padding: 24px 20px 8px;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0.5px;
}

header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

#dropzone {
  border: 2px dashed var(--line);
  border-radius: 14px;
  background: var(--panel);
  padding: 48px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

#dropzone:hover,
#dropzone:focus-visible,
#dropzone.drag {
  border-color: var(--accent);
  background: #1b2030;
  outline: none;
}

#dropzone .primary {
  margin: 0;
  font-size: 16px;
}

#dropzone .hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

#viewer {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

#toolbar button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.15s, opacity 0.15s;
}

#toolbar button:hover:not(:disabled) {
  border-color: var(--accent);
}

#toolbar button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#hint {
  color: var(--muted);
  font-size: 13px;
}

#canvasWrap {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0b0d11;
  padding: 12px;
  display: flex;
  justify-content: center;
  overflow: auto;
}

#page {
  max-width: 100%;
  touch-action: none;
  cursor: crosshair;
  background: #fff;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

#status {
  margin: 0;
  min-height: 20px;
  font-size: 14px;
  color: var(--ok);
}

#status.error {
  color: var(--accent-2);
}