:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-sub: #6b7280;
  --primary: #667eea;
  --primary-hover: #5a6fd6;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f23;
    --surface: #1a1a2e;
    --text: #e2e8f0;
    --text-sub: #94a3b8;
    --border: #2d2d44;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

header { padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); }
nav { max-width: 900px; margin: 0 auto; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--primary); text-decoration: none; }

main { flex: 1; max-width: 900px; margin: 0 auto; padding: 2rem 1.5rem; width: 100%; }
h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.25rem; }
.subtitle { color: var(--text-sub); margin-bottom: 1.5rem; }

/* 드롭존 */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background: rgba(102, 126, 234, 0.05);
}
.dropzone-content svg { color: var(--text-sub); margin-bottom: 1rem; }
.dropzone-content p { font-size: 1rem; margin-bottom: 0.25rem; }
.hint { font-size: 0.8rem; color: var(--text-sub); }

/* 에디터 */
.editor { margin-top: 1rem; }

.toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.toolbar label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar select {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
}

.size-inputs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.size-inputs label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.size-inputs input[type="number"] {
  width: 70px;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.size-sep {
  color: var(--text-sub);
  font-size: 0.85rem;
}

.size-unit {
  font-size: 0.75rem;
  color: var(--text-sub);
}

.toolbar-actions {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
}

.btn-primary {
  padding: 0.45rem 1rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
  padding: 0.45rem 1rem;
  background: none;
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }

/* 캔버스 */
.canvas-container {
  position: relative;
  display: inline-block;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: crosshair;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.canvas-container canvas {
  display: block;
  max-width: 100%;
}

/* 결과 */
.result { margin-top: 2rem; }
.result h2 { font-size: 1.25rem; margin-bottom: 1rem; }

.result-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: inline-block;
  margin-bottom: 0.75rem;
}

.result-preview img {
  display: block;
  max-width: 100%;
  max-height: 400px;
}

.result-info {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 1rem;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
}

footer {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-sub);
  border-top: 1px solid var(--border);
}

@media (max-width: 480px) {
  main { padding: 1.5rem 1rem; }
  .dropzone { padding: 2rem 1rem; }
  .toolbar { gap: 0.5rem; }
  .toolbar-actions { margin-left: 0; width: 100%; }
  .toolbar-actions button { flex: 1; }
}