:root {
  --bg: #0b1220;
  --panel: #131c31;
  --panel2: #1f2a44;
  --fg: #f5f7fb;
  --muted: #9aa7bf;
  --accent: #22c55e;
  --danger: #ef4444;
  --warn: #facc15;
  --cap-size: 30px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); overscroll-behavior: none; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC",
    "Microsoft YaHei", "Segoe UI", Roboto, system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}
#app { height: 100%; height: 100dvh; display: flex; flex-direction: column; }
.screen {
  flex: 1; display: flex; flex-direction: column; min-height: 0;
  padding: max(20px, env(safe-area-inset-top)) 20px max(20px, env(safe-area-inset-bottom));
}
.hidden { display: none !important; }
h1 { font-size: 30px; margin: 8px 0 16px; text-align: center; }
.hint { color: var(--muted); font-size: 17px; text-align: center; line-height: 1.5; }
form label { display: block; margin: 14px 0; font-size: 18px; }
form label.check { display: flex; align-items: center; gap: 10px; }
form label.check input { width: 24px; height: 24px; margin: 0; }
input, select {
  width: 100%; font: inherit; font-size: 20px; padding: 12px; margin-top: 6px;
  border-radius: 10px; border: 1px solid #2c3a5a; background: var(--panel); color: var(--fg);
}
button { font: inherit; cursor: pointer; }
.primary {
  display: block; width: 100%; margin-top: 20px; padding: 18px; border: 0; border-radius: 14px;
  background: var(--accent); color: #04120a; font-size: 24px; font-weight: 700;
}
.primary.huge { font-size: 36px; padding: 40px 20px; margin: auto 0; }
.secondary {
  display: block; width: 100%; margin-top: 12px; padding: 14px; border-radius: 14px;
  background: var(--panel); color: var(--fg); border: 1px solid #2c3a5a; font-size: 19px;
}
.link { background: none; border: 0; color: var(--muted); font-size: 18px; padding: 16px; }
#quick { justify-content: center; }
#quick h1 { font-size: 36px; }
#quick .hint { font-size: 20px; }

/* Full-screen call: the remote video fills the screen; the caption bar,
   captions and controls are translucent overlays stacked at the bottom. */
#call { padding: 0; position: relative; }
#videos { position: absolute; inset: 0; background: #000; }
#remoteVideo { width: 100%; height: 100%; object-fit: cover; display: block; background: #000; }
#localVideo {
  position: absolute; right: 10px; top: max(10px, env(safe-area-inset-top)); width: 26%; aspect-ratio: 3 / 4;
  object-fit: cover; border-radius: 10px; border: 2px solid #ffffff44; background: #222; transform: scaleX(-1);
}
#localVideo.rear { transform: none; }
#callStatus {
  position: absolute; left: 50%; top: 34%; transform: translate(-50%, -50%); max-width: 86%;
  padding: 12px 18px; background: #000000aa; border-radius: 14px;
  font-size: 20px; text-align: center;
}
#capBar {
  position: relative; z-index: 1; margin-top: auto;
  display: flex; align-items: center; gap: 8px; padding: 4px 14px;
  font-size: 15px; color: #dbe3f0dd; text-shadow: 0 1px 2px #000;
}
.dot { width: 12px; height: 12px; border-radius: 50%; background: #64748b; display: inline-block; }
.dot.ok { background: var(--accent); }
.dot.bad { background: var(--danger); }
#captions {
  position: relative; z-index: 1; max-height: 42%; overflow-y: auto;
  padding: 2px 10px; font-size: var(--cap-size); line-height: 1.12;
  display: flex; flex-direction: column; gap: 2px; -webkit-overflow-scrolling: touch;
}
.cap {
  background: #000000b0; border-radius: 8px; padding: 2px 8px; color: #fff;
  width: fit-content; max-width: 100%; align-self: flex-start;
  transition: opacity 10s ease;
}
.cap.fadeout { opacity: 0; }
.cap .txt { word-break: break-word; }
.cap-self { align-self: flex-end; }
.cap.interim .txt { color: #f2f5fa; }
#controls {
  position: relative; z-index: 1;
  display: flex; gap: 6px; padding: 8px 8px max(10px, env(safe-area-inset-bottom));
}
#controls button {
  flex: 1; font-size: 26px; padding: 12px 0; border-radius: 12px; border: 0;
  background: #00000073; color: #fff; min-width: 0;
}
#controls button.active { background: var(--warn); color: #000; }
#controls button.danger { background: var(--danger); }
#toast {
  position: fixed; left: 50%; bottom: 110px; transform: translateX(-50%); max-width: 90%;
  background: #000000dd; color: #fff; padding: 12px 18px; border-radius: 12px; font-size: 18px; z-index: 10;
  text-align: center;
}