:root {
  color-scheme: dark;
  --bg: #0b1220;
  --surface: #121d2d;
  --surface-raised: #17263a;
  --line: #2a3b52;
  --ink: #edf4fb;
  --muted: #93a5b8;
  --teal: #2dd4bf;
  --teal-dark: #0f766e;
  --amber: #fbbf24;
  --danger: #fb7185;
  --radius: 12px;
  --gap: clamp(10px, 1.6vw, 18px);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-width: 320px; background: var(--bg); }
body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 "Segoe UI", system-ui, sans-serif;
}
button, select { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .45; }
button:focus-visible, select:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }

.shell { width: min(960px, 100%); min-width: 0; margin: 0 auto; padding: 30px clamp(16px, 4vw, 42px) 48px; }
.masthead, .message-heading, .status-heading, .control-heading,
.progress-head, .progress-meta, .action-row, .secondary-actions, .dialog-heading,
.dialog-actions { display: flex; align-items: center; }
.masthead { justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.eyebrow, .section-kicker { margin: 0; color: var(--teal); font: 700 11px/1.2 "Consolas", monospace; letter-spacing: .12em; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(28px, 5vw, 42px); line-height: 1.08; letter-spacing: 0; }
h2 { margin: 4px 0 0; font-size: 19px; line-height: 1.25; }
.lede { max-width: 58ch; margin-bottom: 0; color: var(--muted); }
.protocol-mark { flex: 0 0 auto; color: var(--teal); font: 800 21px/1 "Consolas", monospace; }
.protocol-mark span { color: var(--amber); }

.status-panel, .control-panel { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.message-heading { justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.message-count { color: var(--muted); font: 12px/1.2 "Consolas", monospace; }
.message-empty { margin: 0; padding: 22px 0; border-block: 1px solid var(--line); color: var(--muted); text-align: center; }
.message-list { display: grid; max-height: min(28vh, 240px); overflow-y: auto; border-top: 1px solid var(--line); }
.message-item {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 40px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.message-body {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  color: var(--ink);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.message-copy { flex: 0 0 auto; min-width: 44px; min-height: 36px; padding-inline: 8px; }
.status-panel { margin-top: var(--gap); padding: clamp(14px, 2vw, 22px); }
.status-heading, .control-heading { justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.mode-chip, .browser-note { padding: 5px 9px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 12px/1.2 "Consolas", monospace; white-space: nowrap; }
.status-body { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-width: 0; }
.status-line { display: flex; align-items: center; gap: 8px; min-width: 0; flex: 1 1 auto; color: var(--muted); }
.status-line span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status-dot { width: 8px; height: 8px; flex: 0 0 auto; border-radius: 50%; background: var(--muted); }
.status-dot.live { background: var(--teal); box-shadow: 0 0 0 4px rgba(45, 212, 191, .15); }
.status-dot.error { background: var(--danger); }
.status-metrics { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.scan-badge { padding: 5px 8px; border-radius: 6px; background: rgba(8, 14, 24, .85); border: 1px solid var(--line); color: var(--teal); font: 12px "Consolas", monospace; white-space: nowrap; }
.frame-rate { color: var(--muted); font: 12px "Consolas", monospace; white-space: nowrap; }
.status-hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
/* 隐藏采集节点：不影响 MediaStream 原始分辨率解码 */
.capture-host {
  position: fixed;
  width: 1px;
  height: 1px;
  left: -100vw;
  top: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}
.capture-host video,
.capture-host canvas {
  position: absolute;
  width: 1px;
  height: 1px;
}

.control-panel { margin-top: var(--gap); padding: clamp(14px, 2vw, 22px); }
.control-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--gap); }
.field { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.field select, .field-status strong { min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-raised); color: var(--ink); }
.field-status strong { display: flex; align-items: center; overflow: hidden; font-size: 14px; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.action-row { gap: 10px; margin-top: var(--gap); }
.button { min-height: 44px; padding: 9px 15px; border: 1px solid transparent; border-radius: 8px; font-weight: 700; transition: background-color .2s ease, border-color .2s ease, transform .2s ease; }
.button:active { transform: scale(.98); }
.button-primary { background: var(--teal); color: #042f2e; }
.button-primary:hover { background: #5eead4; }
.button-secondary { border-color: var(--line); background: var(--surface-raised); color: var(--ink); }
.button-secondary:hover { border-color: var(--teal-dark); }
.action-row .button { flex: 1; }
.progress-block { margin-top: 22px; }
.progress-head, .progress-meta { justify-content: space-between; gap: 12px; color: var(--muted); font-size: 13px; }
.progress-head strong { color: var(--ink); font: 700 14px "Consolas", monospace; }
.progress-track { height: 9px; margin: 8px 0 7px; overflow: hidden; border-radius: 999px; background: #25354b; }
.progress-fill { width: 0; height: 100%; border-radius: inherit; background: var(--teal); transition: width .2s ease; }
.progress-meta { font: 12px "Consolas", monospace; }
.secondary-actions { justify-content: flex-end; gap: 16px; margin-top: 17px; }
.text-button { padding: 2px 0; border: 0; background: transparent; color: var(--muted); font-size: 13px; text-decoration: underline; text-underline-offset: 3px; }
.text-button:hover { color: var(--teal); }
.notice { display: flex; gap: 10px; margin-top: var(--gap); padding: 12px 14px; border-left: 3px solid var(--amber); background: rgba(251, 191, 36, .08); color: var(--muted); font-size: 13px; }
.notice strong { flex: 0 0 auto; color: var(--amber); }

dialog { width: min(540px, calc(100% - 24px)); padding: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); box-shadow: 0 24px 70px rgba(0, 0, 0, .45); }
dialog::backdrop { background: rgba(3, 8, 16, .7); }
.dialog-heading { justify-content: space-between; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.icon-button { width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-raised); color: var(--muted); font-size: 24px; line-height: 1; }
.dialog-meta { margin: 18px 20px 10px; color: var(--muted); font-size: 13px; }
.missing-ranges { max-height: 240px; margin: 0 20px; overflow: auto; padding: 13px; border: 1px solid var(--line); border-radius: 8px; background: #0b1423; color: var(--teal); font: 13px/1.7 "Consolas", monospace; white-space: pre-wrap; word-break: break-word; }
.dialog-actions { justify-content: flex-end; gap: 10px; padding: 18px 20px; }

@media (max-width: 620px) {
  .shell { padding-top: 20px; }
  .masthead { align-items: flex-start; }
  .protocol-mark { display: none; }
  .message-heading, .status-heading, .control-heading { align-items: flex-start; flex-wrap: wrap; }
  .message-heading > div, .status-heading > div, .control-heading > div { min-width: 0; }
  .status-body { align-items: flex-start; flex-direction: column; }
  .mode-chip, .browser-note { max-width: 100%; white-space: normal; }
  .control-grid { grid-template-columns: 1fr; }
  .action-row { align-items: stretch; flex-direction: column; }
  .notice { align-items: flex-start; flex-direction: column; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}