/* 订阅转换 —— 仪表盘式深色界面
   三段管线（输入 / 变换 / 输出）是页面结构，颜色只用于编码状态。 */

:root {
  --bg: #0e1419;
  --panel: #151d24;
  --panel-2: #1b252e;
  --line: #27333d;
  --line-2: #35434f;
  --text: #dbe3ea;
  --dim: #8695a3;
  --signal: #f0a202;   /* 控制态：选中 / 主操作 */
  --wire: #45b7ab;     /* 数据态：链接 / 载荷 */
  --warn: #e06a4a;

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;

  --radius: 10px;
  --maxw: 940px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 80px;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(69, 183, 171, .05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(69, 183, 171, .05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

code {
  font-family: var(--mono);
  font-size: .92em;
  color: var(--wire);
  background: rgba(69, 183, 171, .08);
  padding: 1px 5px;
  border-radius: 4px;
}

/* ── 页头 ── */

.masthead {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px 0 22px;
}

.masthead h1 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--signal);
}

.masthead p { margin: 0; max-width: 64ch; color: var(--dim); }

main { max-width: var(--maxw); margin: 0 auto; }

/* ── 管线段 ── */

.stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.stage__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.stage__head span {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--signal);
}

.stage__head em {
  font-style: normal;
  font-size: 12px;
  color: var(--dim);
}

/* 段标题右侧的细线 */
.stage__head::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line);
  transform: translateY(-2px);
}

.stage__head em + * { flex: none; }

/* ── 分段控件 ── */

.seg, .core {
  display: inline-flex;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel-2);
  margin-bottom: 14px;
}

.seg button, .core button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--dim);
  padding: 9px 18px 8px;
  cursor: pointer;
  text-align: center;
  line-height: 1.15;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  transition: background-color .16s ease, color .16s ease;
}

.seg button + button, .core button + button { border-left: 1px solid var(--line); }

.core__name { display: block; font-size: 13px; letter-spacing: .12em; }
.core__val { display: block; margin-top: 2px; font-size: 10px; letter-spacing: .06em; opacity: .55; }

.seg button[aria-selected="true"], .core button[aria-checked="true"] {
  background: var(--signal);
  color: #1a1206;
}
.core button[aria-checked="true"] .core__val { opacity: .7; }

.seg button:hover:not([aria-selected="true"]),
.core button:hover:not([aria-checked="true"]) { color: var(--text); background: #202b35; }

/* ── 表单 ── */

.field { display: block; }
.field + .field, .grid, .checks, .actions, .fold, .preview { margin-top: 16px; }
.stage .field:first-of-type { margin-top: 0; }

.field__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dim);
}

.hint { margin: 8px 0 0; font-size: 12px; color: var(--dim); }

textarea, input[type="text"] {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  font: 12.5px/1.65 var(--mono);
  resize: vertical;
}

textarea { min-height: 76px; }

textarea::placeholder, input::placeholder { color: #5d6b78; }

textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(240, 162, 2, .16);
}
button:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.checks { display: flex; flex-wrap: wrap; gap: 20px; }

.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--dim);
  font-size: 13px;
  cursor: pointer;
}
.check input { accent-color: var(--signal); width: 15px; height: 15px; }

/* ── 按钮 ── */

.actions { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  appearance: none;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .05em;
  cursor: pointer;
  transition: border-color .15s ease, background-color .15s ease, color .15s ease;
}
.btn:hover { border-color: var(--wire); color: var(--wire); }

.btn--primary { background: var(--signal); border-color: var(--signal); color: #1a1206; font-weight: 600; }
.btn--primary:hover { background: #ffb31c; border-color: #ffb31c; color: #1a1206; }

/* ── 输出 ── */

.rowhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.kv { font-family: var(--mono); font-size: 12px; letter-spacing: .04em; color: var(--dim); }

.fold summary {
  cursor: pointer;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.fold summary:hover { color: var(--wire); }

#out-json pre, .preview pre {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  margin: 12px 0 0;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  font: 11.5px/1.6 var(--mono);
  color: var(--dim);
}
#out-json .idx { color: var(--signal); margin-right: 8px; }

.preview__stat { font-family: var(--mono); font-size: 12px; color: var(--dim); margin: 0; }
.preview--bad .preview__stat { color: var(--warn); }

/* ── 页脚 ── */

.colophon {
  max-width: var(--maxw);
  margin: 34px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 12.5px;
}
.colophon p { margin: 6px 0; }

/* ── 响应式 ── */

@media (max-width: 640px) {
  body { padding: 0 14px 64px; }
  .masthead { padding-top: 30px; }

  .seg, .core { display: flex; width: 100%; margin-bottom: 14px; }
  .seg button, .core button { flex: 1; padding: 9px 10px 8px; }

  .grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}