:root {
  --bg: #0f0f14;
  --bg-2: #1a1a24;
  --bg-3: #252535;
  --fg: #e8e8f0;
  --fg-dim: #8888a0;
  --accent: #7c5cff;
  --accent-2: #a890ff;
  --ok: #4ade80;
  --err: #f87171;
  --border: #2a2a3a;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
    Arial, "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, #0a0a12 100%);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 60px 20px 40px;
  background: radial-gradient(ellipse at top, rgba(124, 92, 255, 0.15) 0%, transparent 60%);
}
header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
header .sub {
  margin-top: 12px;
  color: var(--fg-dim);
  font-size: 0.95rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px 40px;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--bg-2);
}
.dropzone:hover, .dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(124, 92, 255, 0.08);
}
.dz-inner {
  cursor: pointer;
  display: block;
}
.dz-icon { font-size: 48px; margin-bottom: 12px; }
.dz-text strong { display: block; font-size: 1.1rem; margin-bottom: 6px; }
.dz-text small { color: var(--fg-dim); }

/* Status */
.status {
  margin-top: 20px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.status-msg { color: var(--fg-dim); margin-bottom: 12px; font-size: 0.9rem; }
.progress {
  height: 6px;
  background: var(--bg-3);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.3s ease;
}

/* Result */
.result {
  margin-top: 20px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.result-toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.btn {
  padding: 8px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { background: var(--accent-2); transform: translateY(-1px); }
.btn-secondary {
  padding: 8px 16px;
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover { color: var(--fg); border-color: var(--fg-dim); }
.meta { color: var(--fg-dim); font-size: 0.85rem; margin-left: auto; }
.canvas-wrap {
  background: #181825;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  justify-content: center;
}
canvas { max-width: 100%; height: auto; display: block; }

.adv {
  margin-top: 16px;
  color: var(--fg-dim);
  font-size: 0.85rem;
}
.adv summary { cursor: pointer; padding: 6px 0; }
.adv pre {
  margin-top: 8px;
  padding: 12px;
  background: var(--bg);
  border-radius: 6px;
  font-size: 0.8rem;
  overflow-x: auto;
  border: 1px solid var(--border);
}

/* Error */
.error {
  margin-top: 20px;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.error h3 { color: var(--err); margin-bottom: 8px; }
.error p { color: var(--fg-dim); margin-bottom: 16px; }

.hidden { display: none !important; }

footer {
  text-align: center;
  padding: 30px 20px;
  color: var(--fg-dim);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}
footer a { color: var(--accent-2); text-decoration: none; }
footer a:hover { text-decoration: underline; }