:root {
  --bg: #f5f6f8;
  --card: #fff;
  --text: #1d2129;
  --muted: #6b7280;
  --border: #e3e5e8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --code-bg: #f8f9fb;
  --error: #dc2626;
  --ok: #16a34a;
  --warn-bg: #fffbeb;
  --warn-border: #fcd34d;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1a1d23;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2d3139;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --code-bg: #14161b;
    --error: #f87171;
    --ok: #4ade80;
    --warn-bg: #2a2310;
    --warn-border: #854d0e;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
/* .result 等元素自己声明了 display，会盖过 UA 样式里 [hidden] 的 display: none */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

header h1 { margin: 0 0 4px; font-size: 26px; }
.sub { margin: 0 0 24px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.dropzone {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  margin-bottom: 6px;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  background: var(--code-bg);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone:focus, .dropzone.dragover {
  border-color: var(--accent);
  outline: none;
}
.dropzone.dragover { background: var(--card); }
.dz-text { flex: 1; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.qr-target { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; margin: 2px 2px 4px; font-size: 13px; color: var(--muted); }
.qr-target label { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.relay-label { margin-top: 14px; }
.route { margin: -4px 0 8px; font-size: 13px; color: var(--muted); }
.route b { color: var(--text); font-weight: 600; }
.relay-all { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; margin-top: 6px; font-size: 14px; }

.summary { margin-bottom: 14px; }
.routes { list-style: none; margin: 0 0 8px; padding: 0; font-size: 14px; }
.routes li { display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: baseline; padding: 6px 0; border-bottom: 1px dashed var(--border); }
.routes li:last-child { border-bottom: 0; }
.routes .node { font-weight: 600; word-break: break-all; }
.routes .via { font-size: 13px; color: var(--muted); }
.routes .via.relayed { color: var(--accent); }
.tag { font-size: 12px; padding: 0 6px; border-radius: 4px; background: var(--code-bg); border: 1px solid var(--border); color: var(--muted); }
.note { margin: 0 0 8px; font-size: 13px; color: var(--muted); }
.note:empty, .warnings:empty { display: none; }
.warnings { margin: 0; padding: 10px 12px 10px 28px; border-radius: 8px; font-size: 13px; line-height: 1.6;
  background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--text); }
.warnings li + li { margin-top: 4px; }
.qr-status { min-height: 1.4em; margin: 0 0 10px; font-size: 13px; color: var(--muted); word-break: break-all; }
.qr-status.ok { color: var(--ok); }
.qr-status.fail { color: var(--error); }

.label { display: block; font-weight: 600; margin-bottom: 8px; }
.hint { color: var(--muted); font-size: 13px; font-weight: normal; }
.center { text-align: center; }

textarea, input, select {
  font: inherit;
  color: inherit;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

textarea {
  width: 100%;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13.5px;
  resize: vertical;
}

textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

select { padding: 4px 8px; margin-left: 4px; }

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin: 14px 0 4px;
  font-size: 14px;
}
.options .check { display: flex; align-items: center; gap: 6px; }

.actions { display: flex; align-items: center; gap: 16px; margin-top: 16px; }
.error { color: var(--error); font-size: 14px; }

button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 600;
  padding: 8px 18px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
button:hover, .button:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button:disabled { opacity: .6; cursor: wait; }

button.secondary, .button.secondary {
  background: transparent;
  color: var(--accent);
}
button.secondary:hover, .button.secondary:hover { background: var(--code-bg); }

.result {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  margin-top: 20px;
  align-items: start;
}
/* grid 子项默认 min-width: auto，会被 <pre> 里的长行撑得比屏幕还宽 */
.result > * { min-width: 0; }
@media (max-width: 760px) {
  .result { grid-template-columns: 1fr; }
}

.tabs { display: flex; gap: 4px; margin-bottom: 12px; }
.tab {
  flex: 1;
  padding: 6px 0;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  font-weight: 500;
}
.tab:hover { background: var(--code-bg); border-color: var(--border); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

#qr {
  display: block;
  width: 100%;
  max-width: 280px;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
  background: #fff;
}

.row { display: flex; gap: 8px; margin-bottom: 12px; }
.row input { flex: 1; min-width: 0; padding: 6px 10px; font-size: 13px; }
.row.buttons > * { flex: 1; }

.yaml-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.yaml-head .label { margin: 0; }

pre {
  margin: 0;
  padding: 14px 16px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: auto;
  max-height: 640px;
  font: 13px/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre;
}

footer { margin-top: 32px; text-align: center; color: var(--muted); font-size: 13px; }