:root {
  --bg: #f6f7fa;
  --card: #ffffff;
  --text: #16181d;
  --muted: #5f6775;
  --line: #e2e5ea;
  --accent: #1f6feb;
  --accent-ink: #ffffff;
  --ok: #1a7f37;
  --warn: #b35c00;
  --bad: #c62828;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1117;
    --card: #181b23;
    --text: #e8eaf0;
    --muted: #9aa3b2;
    --line: #2a2f3a;
    --accent: #5b9dff;
    --accent-ink: #0b1220;
    --ok: #4cc26a;
    --warn: #ffb04d;
    --bad: #ff6b6b;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
a { color: var(--accent); }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; max-width: 640px; width: 100%; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; font-weight: 600; }
.brand img { border-radius: 8px; }

.wrap { max-width: 640px; width: 100%; margin: 0 auto; padding: 0 16px 24px; flex: 1; }
.foot { text-align: center; font-size: 13px; padding: 16px; }
.muted { color: var(--muted); }
.note { padding: 16px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px; margin: 14px 0;
}
.card h1, .card h2 { margin: 0 0 8px; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }
p { margin: 8px 0; }

.btn {
  appearance: none; border: 1px solid var(--line); background: var(--card); color: var(--text);
  border-radius: 12px; padding: 10px 16px; font: inherit; font-weight: 600; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; transition: transform .05s ease, background .15s ease;
}
.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-lg { font-size: 1.15rem; padding: 14px 24px; min-height: 56px; }
.btn-block { width: 100%; }
.btn-sm { min-height: 32px; padding: 4px 10px; font-size: 13px; }
.overlay-card .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); margin-top: 20px; }
.btn-ring {
  font-size: 1.4rem; min-height: 96px; border-radius: 24px; width: 100%;
  background: var(--accent); color: var(--accent-ink); border-color: transparent;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn-ring:disabled { box-shadow: none; }

.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.stack { display: grid; gap: 10px; }

label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; }
input[type="text"] {
  width: 100%; font: inherit; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text); min-height: 44px;
}
input[type="text"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.pill {
  font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); white-space: nowrap;
}
.pill-muted { color: var(--muted); }
.pill-ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.pill-warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.pill-bad { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }

.qr { display: grid; place-items: center; padding: 12px; background: #fff; border-radius: 12px; margin: 12px auto; max-width: 320px; }
.qr svg { width: 100%; height: auto; display: block; }
.url { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; word-break: break-all; }
.code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.6rem; letter-spacing: .12em; font-weight: 700; }

.sounds { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.sound {
  border: 2px solid var(--line); border-radius: 12px; padding: 10px 12px; background: var(--card);
  cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 52px;
  font: inherit; color: inherit; text-align: left;
}
.sound[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--card)); }
.sound .play { font-size: 13px; color: var(--muted); }

.log { list-style: none; margin: 0; padding: 0; }
.log li { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-top: 1px solid var(--line); }
.log li:first-child { border-top: 0; }
.log time { color: var(--muted); font-size: 13px; white-space: nowrap; }
.empty { color: var(--muted); font-style: italic; }

.status { font-size: 14px; }
.ok { color: var(--ok); } .warn { color: var(--warn); } .bad { color: var(--bad); }

.overlay {
  position: fixed; inset: 0; background: color-mix(in srgb, var(--accent) 92%, black);
  display: grid; place-items: center; padding: 24px; z-index: 50;
  animation: flash .6s ease-in-out 3;
}
.overlay[hidden] { display: none; }
.overlay-card { text-align: center; color: #fff; max-width: 420px; }
.overlay-card h2 { font-size: 2rem; margin: 8px 0; }
.overlay-card .muted { color: rgba(255,255,255,.8); font-size: 1.1rem; }
.overlay-card .btn-primary { background: #fff; color: #0b1220; margin-top: 20px; }
.ring-icon { font-size: 72px; animation: swing 1s ease-in-out infinite; display: inline-block; transform-origin: top center; }
@keyframes swing { 0%,100% { transform: rotate(-12deg); } 50% { transform: rotate(12deg); } }
@keyframes flash { 0%,100% { filter: brightness(1); } 50% { filter: brightness(1.35); } }
@media (prefers-reduced-motion: reduce) { .ring-icon, .overlay { animation: none; } }

.kbd { font-family: ui-monospace, monospace; font-size: 13px; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
details summary { cursor: pointer; font-weight: 600; }
.small { font-size: 13px; }