:root {
  --bg: #0f1216;
  --card: #1a1f27;
  --fg: #e7ebf0;
  --muted: #9aa4b2;
  --accent: #4f8cff;
  --danger: #ff5c5c;
  --border: #2a313c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; font-size: 18px; }
.controls { display: flex; align-items: center; gap: 12px; }
.badge { color: var(--muted); font-size: 14px; }

main {
  max-width: 720px;
  margin: 28px auto;
  padding: 0 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  margin-bottom: 18px;
}

h2 { font-size: 16px; margin: 18px 0 10px; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  flex: 1;
  padding: 10px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.tab.active { color: var(--fg); border-color: var(--accent); }

.form { display: flex; flex-direction: column; gap: 12px; }
input, select {
  padding: 11px 12px;
  background: #0f1319;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}

button.primary, a.btn.primary {
  padding: 11px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}
button.primary:disabled { opacity: 0.5; cursor: not-allowed; }

button.link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
}

.preview { margin: 14px 0; }
.preview img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.kv { list-style: none; padding: 0; color: var(--muted); line-height: 1.9; }
.kv b { color: var(--fg); }

#detectBtn, #removeBtn, #downloadLink { margin-top: 12px; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #222a35;
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
}
.toast.error { border-color: var(--danger); color: var(--danger); }

.foot { color: var(--muted); font-size: 13px; margin-top: 18px; text-align: center; }
.foot a { color: var(--accent); }

.hidden { display: none !important; }