/* MultiDrop web edition. One radar of nearby devices on top, everything else in
   panels below. Light and dark follow the system. */
:root {
  --bg: #f4f5f8; --fg: #14161c; --muted: #646a78; --card: #fff; --line: #e2e5ec;
  --accent: #1f6feb; --accent-2: #5ac8fa; --ok: #1a9e4b; --bad: #d23c3c;
  --stage: radial-gradient(120% 90% at 50% 45%, #1b3a78 0%, #0e1d3f 55%, #0b1020 100%);
  --ring: rgba(140, 180, 255, .18); --on-stage: #eef3ff; --on-stage-muted: #9fb2d9;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 18px;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b0d12; --fg: #e9ecf3; --muted: #9098aa; --card: #151922; --line: #252b38;
          --accent: #5a9cff; --ok: #47c97a; --bad: #ff6b6b;
          --stage: radial-gradient(120% 90% at 50% 45%, #183466 0%, #0d1a38 55%, #080c18 100%);
          --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px rgba(0, 0, 0, .35); }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); min-height: 100vh; }
a { color: var(--accent); }
[hidden] { display: none !important; }

/* Header */
header.top { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: .9rem;
             padding: .7rem max(1rem, env(safe-area-inset-right)) .7rem max(1rem, env(safe-area-inset-left));
             background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px);
             border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .5rem; color: var(--fg); text-decoration: none;
         font-weight: 700; font-size: 1.1rem; letter-spacing: .01em; }
.brand em { font-style: normal; font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
            color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
            border-radius: 999px; padding: .05rem .45rem; }
#status { margin-left: auto; display: inline-flex; align-items: center; gap: .45rem; color: var(--muted);
          font-size: .85rem; max-width: 50vw; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#status::before { content: ""; width: .5rem; height: .5rem; border-radius: 50%; background: var(--muted); flex: none; }
#status.ready::before { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent); }

main { max-width: 64rem; margin: 0 auto; padding: 1.2rem 1rem 3rem; }
h2 { margin: 0 0 .7rem; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.hint, .meta { color: var(--muted); font-size: .85rem; }
.hint:empty { display: none; }
.center { text-align: center; }
.row { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.name { font-weight: 600; overflow-wrap: anywhere; }

/* Controls */
button { font: inherit; font-weight: 600; padding: .5rem 1rem; border-radius: 12px; cursor: pointer;
         border: 1px solid var(--line); background: var(--card); color: var(--fg);
         transition: background .15s, border-color .15s, transform .1s, filter .15s; }
button.primary { background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 88%, #fff), var(--accent));
                 border-color: transparent; color: #fff; }
button.primary:hover:not(:disabled) { filter: brightness(1.08); }
button:hover:not(:disabled):not(.primary) { border-color: var(--accent); }
button:active:not(:disabled) { transform: translateY(1px); }
button.danger { color: var(--bad); }
button.small { padding: .35rem .8rem; font-size: .85rem; }
button:disabled, input:disabled, select:disabled { opacity: .45; cursor: not-allowed; }
input, select, textarea { font: inherit; padding: .55rem .7rem; border-radius: 12px; border: 1px solid var(--line);
                          background: var(--bg); color: var(--fg); transition: border-color .15s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
textarea { width: 100%; resize: vertical; margin-bottom: .5rem; }
select { flex: 1; min-width: 10rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: .8rem 1rem; }

/* Radar: you in the middle, devices on rings around you, like AirDrop. */
.radar { position: relative; margin: 0 0 1.2rem; padding: 0 0 1rem; border-radius: 28px; overflow: hidden;
         background: var(--stage); color: var(--on-stage); box-shadow: var(--shadow); }
.radar .hint { color: var(--on-stage-muted); padding: 0 1rem; }
.stage { --r0: min(9.5rem, 27vw); --r1: min(14rem, 40vw); position: relative; height: 31rem; }
.stage.big { height: 36rem; }
.stage::before, .stage::after { content: ""; position: absolute; left: 50%; top: 50%; border-radius: 50%;
         border: 1px solid var(--ring); transform: translate(-50%, -50%); pointer-events: none; }
.stage::before { width: calc(2 * var(--r0)); height: calc(2 * var(--r0)); }
.stage::after { width: calc(2 * var(--r1)); height: calc(2 * var(--r1)); }
.me, .device { position: absolute; left: 50%; top: 50%; text-align: center; width: 9rem; z-index: 1; }
.me { transform: translate(-50%, -50%); }
.device { transform: translate(-50%, -50%) rotate(var(--a)) translateY(calc(-1 * var(--r))) rotate(calc(-1 * var(--a)));
          transition: transform .25s ease; }
.device.card { background: none; border: none; padding: 0; }
.stage .name { font-size: .92rem; color: var(--on-stage); }
.stage .meta { color: var(--on-stage-muted); font-size: .78rem; }
.avatar { position: relative; display: grid; place-items: center; width: 4.4rem; height: 4.4rem; margin: 0 auto .4rem;
          border-radius: 50%; color: #fff; font-weight: 700; font-size: 1.45rem;
          background: linear-gradient(160deg, hsl(var(--hue, 215) 70% 62%), hsl(var(--hue, 215) 65% 42%));
          box-shadow: 0 6px 18px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .25);
          transition: transform .15s, box-shadow .15s; }
.me .avatar { width: 5rem; height: 5rem; background: linear-gradient(160deg, var(--accent-2), var(--accent)); }
.me .avatar::before, .me .avatar::after { content: ""; position: absolute; inset: 0; border-radius: 50%;
          border: 2px solid var(--accent-2); animation: wave 3.2s ease-out infinite; }
.me .avatar::after { animation-delay: 1.6s; }
@keyframes wave { 0% { transform: scale(1); opacity: .55; } 100% { transform: scale(3.4); opacity: 0; } }
.device.drop { cursor: pointer; }
.device.drop:hover .avatar { transform: scale(1.06); }
.device.drop.over .avatar { transform: scale(1.12); box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent-2) 45%, transparent); }
.device.offline { opacity: .5; }
.device.offline .avatar { filter: grayscale(.85); }
.device.nearby .avatar::after { content: ""; position: absolute; right: .1rem; bottom: .1rem; width: .8rem; height: .8rem;
          border-radius: 50%; background: var(--ok); border: 2px solid #0e1d3f; }
.pairbubble { cursor: pointer; opacity: .75; }
.pairbubble:hover { opacity: 1; }
.pairbubble .avatar { background: none; box-shadow: none; border: 2px dashed var(--on-stage-muted);
                      color: var(--on-stage-muted); font-size: 1.8rem; width: 3.6rem; height: 3.6rem; }
.pairbubble .name { color: var(--on-stage-muted); font-weight: 500; font-size: .82rem; white-space: nowrap; }
.radar-empty { position: absolute; left: 0; right: 0; top: 21.5rem; display: grid; gap: .2rem;
               text-align: center; padding: 0 1rem; pointer-events: none; color: var(--on-stage-muted); font-size: .9rem; }
.radar-empty strong { color: var(--on-stage); font-weight: 600; }
.radar:has(.device.card) .radar-empty { display: none; }
.alias-edit { display: flex; align-items: center; justify-content: center; gap: .5rem; font-size: .85rem;
              color: var(--on-stage-muted); margin: 0 1rem .5rem; }
.alias-edit input { width: 12rem; background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .15);
                    color: var(--on-stage); text-align: center; }

/* Panels */
.panels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; align-items: start; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem;
         box-shadow: var(--shadow); margin: 0; }
.panel.wide { grid-column: 1 / -1; }
details.panel > summary { list-style: none; cursor: pointer; display: flex; align-items: baseline; gap: .6rem; }
details.panel > summary::-webkit-details-marker { display: none; }
details.panel > summary h2 { margin: 0; }
details.panel > summary::after { content: "›"; margin-left: auto; color: var(--muted); font-size: 1.2rem;
                                 transition: transform .15s; }
details.panel[open] > summary { margin-bottom: .7rem; }
details.panel[open] > summary::after { transform: rotate(90deg); }
.pin { font: 700 1.8rem ui-monospace, monospace; letter-spacing: .18em; margin: .3rem 0; }
#pair-qr svg { display: block; margin: .6rem 0; background: #fff; border-radius: 10px; padding: 4px; }
#pair-code { width: 9rem; font-variant-numeric: tabular-nums; }
#pair-host { margin-top: .8rem; }

/* Transfers */
.job { display: grid; grid-template-columns: 1fr auto; gap: .3rem .75rem; align-items: center; margin-bottom: .5rem; }
.job .what { overflow-wrap: anywhere; font-weight: 500; }
.job progress { grid-column: 1 / -1; width: 100%; height: .4rem; appearance: none; border: none; border-radius: 999px;
                background: var(--line); overflow: hidden; }
.job progress::-webkit-progress-bar { background: var(--line); }
.job progress::-webkit-progress-value { background: linear-gradient(90deg, var(--accent-2), var(--accent)); border-radius: 999px; }
.job progress::-moz-progress-bar { background: var(--accent); }
.job .state { font-size: .8rem; color: var(--muted); }
.job.done .state { color: var(--ok); }
.job.failed .state { color: var(--bad); }
.job button { grid-column: 2; grid-row: 1; }

/* History */
#log { font-size: .85rem; color: var(--muted); max-height: 18rem; overflow: auto; padding-left: 1.4rem; margin: 0; }
#log li { margin: .15rem 0; overflow-wrap: anywhere; }
#log time { font-variant-numeric: tabular-nums; margin-right: .5rem; opacity: .7; }

/* Incoming transfers: a sheet over the page, like AirDrop's prompt. */
#offers-section { position: fixed; left: 50%; bottom: max(1rem, env(safe-area-inset-bottom)); transform: translateX(-50%);
                  z-index: 30; width: min(27rem, calc(100% - 2rem)); margin: 0; animation: rise .22s ease-out; }
@keyframes rise { from { transform: translate(-50%, 1rem); opacity: 0; } }
#offers-section h2 { display: none; }
.card.offer { margin: 0 0 .6rem; border-radius: 22px; padding: 1.1rem 1.2rem; box-shadow: 0 18px 50px rgba(0, 0, 0, .35); }
.card.offer .name { font-size: 1.05rem; }
.card.offer .meta { margin-bottom: .4rem; }
.offer ul { margin: .4rem 0 .8rem; padding-left: 1.2rem; max-height: 14rem; overflow: auto; }
.offer ul.selectable { list-style: none; padding-left: .2rem; }
.offer ul.selectable label { cursor: pointer; overflow-wrap: anywhere; }
.card.offer .row button { flex: 1; }

footer { margin-top: 2rem; color: var(--muted); font-size: .8rem; text-align: center; }
footer p { max-width: 40rem; margin: .4rem auto; }

@media (max-width: 44rem) {
  main { padding: .8rem .75rem 7rem; }
  .panels { grid-template-columns: 1fr; }
  .radar { border-radius: 22px; }
  .stage { --r0: 8rem; --r1: 11.6rem; height: 26rem; }
  .stage.big { height: 30rem; }
  .me, .device { width: 7.4rem; }
  .avatar { width: 3.7rem; height: 3.7rem; font-size: 1.25rem; }
  .me .avatar { width: 4.2rem; height: 4.2rem; }
  .radar-empty { top: 18rem; font-size: .85rem; }
  .radar-empty span { max-width: 15rem; margin: 0 auto; }
  #status { max-width: 40vw; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }