html, body { min-height: 100%; }
body { padding: 18px 14px 48px; background: radial-gradient(circle at 50% 0, #123154 0, transparent 38%), var(--bg); }
.sender-wrap { width: min(720px, 100%); margin: 0 auto; }
.sender-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 15px; }
.sender-brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.sender-brand h1 { margin: 0; font-size: 19px; }
.sender-brand small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; }
.top-actions { display: flex; gap: 7px; }
.sender-card { padding: 18px; }
.server-line { display: flex; align-items: center; gap: 9px; margin: 12px 1px 2px; font-size: 11px; }
.server-line #latencyText { margin-left: auto; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.meter-zone { display: grid; place-items: center; margin: 24px 0 14px; }
.meter { --level: 0; --signal: #ef4444; width: min(68vw, 300px); aspect-ratio: 1; display: grid; place-items: center; position: relative; border-radius: 50%; background: conic-gradient(var(--signal) calc(var(--level) * 1%), rgba(148, 163, 184, .12) 0); box-shadow: 0 24px 80px rgba(0, 0, 0, .38), 0 0 55px color-mix(in srgb, var(--signal) 18%, transparent); transition: background .12s linear; }
.meter::before { content: ""; position: absolute; inset: 17px; border: 1px solid var(--line); border-radius: 50%; background: radial-gradient(circle at 50% 34%, #142d48, #081421 72%); }
.meter-inner { z-index: 1; display: grid; grid-template-columns: auto auto; align-items: end; text-align: center; }
.meter-inner strong { font-size: clamp(56px, 14vw, 78px); line-height: .92; font-variant-numeric: tabular-nums; }
.meter-inner > span { margin: 0 0 8px 4px; color: var(--muted); font-size: 15px; }
.meter-inner small { grid-column: 1 / -1; margin-top: 10px; color: var(--muted); font-size: 12px; }
.meter-caption { width: min(68vw, 300px); display: flex; justify-content: space-between; margin-top: 10px; color: var(--muted); font-size: 9px; }
.signal-settings { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 8px; align-items: end; padding: 11px; border: 1px solid var(--line); border-radius: 13px; background: rgba(8, 20, 33, .58); }
.offset-field { margin: 0; }
.offset-field input { min-height: auto; padding: 0; accent-color: var(--accent); }
.signal-settings .btn { min-height: 35px; font-size: 10px; white-space: nowrap; }
.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 13px 0; }
.metric-card { min-width: 0; padding: 10px; border: 1px solid var(--line); border-radius: 11px; background: rgba(15, 23, 42, .48); }
.metric-card strong { display: block; overflow: hidden; font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.metric-card span { display: block; margin-top: 5px; color: var(--muted); font-size: 8px; }
.start-btn { width: 100%; min-height: 52px; border: 0; border-radius: 13px; background: linear-gradient(145deg, #16a34a, #22c55e); box-shadow: 0 13px 34px rgba(34, 197, 94, .24); color: white; cursor: pointer; font-size: 17px; font-weight: 850; }
.start-btn.stop { background: linear-gradient(145deg, #dc2626, #ef4444); box-shadow: 0 13px 34px rgba(239, 68, 68, .20); }
.start-btn:disabled { opacity: .48; cursor: not-allowed; }
.secondary-actions { display: flex; justify-content: center; gap: 8px; margin-top: 11px; }
.secondary-actions .btn { font-size: 10px; }
.privacy-note { margin-top: 13px; color: var(--muted); font-size: 9px; line-height: 1.6; text-align: center; }
@media (max-width: 680px) {
  body { padding: 12px 10px 38px; }
  .sender-top { align-items: flex-start; }
  .sender-brand h1 { font-size: 16px; }
  .sender-brand small { display: none; }
  .top-actions .btn { min-height: 34px; padding: 7px 9px; font-size: 10px; }
  .sender-card { padding: 14px; }
  .form-grid { grid-template-columns: 1fr; }
  .signal-settings { grid-template-columns: 1fr 1fr; }
  .offset-field { grid-column: 1 / -1; }
  .status-grid { grid-template-columns: 1fr 1fr; }
}