:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f232c;
  --line: #2a2f3a;
  --fg: #e6e9ef;
  --muted: #8b93a3;
  --accent: #4c8dff;
  --accent-2: #3576e8;
  --ok: #3ecf8e;
  --warn: #ffb020;
  --err: #ff6b6b;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 16px 16px;
}

.shell { width: 100%; max-width: 660px; flex: 1; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .35);
}

.title { margin: 0 0 6px; font-size: 22px; font-weight: 650; letter-spacing: .2px; }
.title-sm { font-size: 18px; }
.sub { margin: 0 0 20px; color: var(--muted); font-size: 13.5px; }
.sub-tight { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.center { text-align: center; }

/* ---------- buttons ---------- */
.btn {
  font: inherit;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s;
  white-space: nowrap;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover:not(:disabled) { background: var(--accent-2); }
.btn-secondary { background: var(--panel-2); color: var(--fg); border-color: var(--line); }
.btn-secondary:hover:not(:disabled) { border-color: #3d4557; }
.btn-ghost { background: transparent; color: var(--muted); border-color: var(--line); text-decoration: none; display: inline-block; }
.btn-ghost:hover:not(:disabled) { color: var(--fg); border-color: #3d4557; }
.btn-block { width: 100%; padding: 13px 16px; font-size: 15.5px; }
.btn-sm { padding: 5px 10px; font-size: 12.5px; border-radius: 8px; }

/* ---------- inputs ---------- */
.join { display: flex; gap: 8px; }
.input {
  flex: 1; min-width: 0; font: inherit;
  background: var(--panel-2); color: var(--fg);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 14px; outline: none;
}
.input:focus { border-color: var(--accent); }

.msg { margin: 14px 0 0; font-size: 13.5px; }
.msg.err { color: var(--err); }
.msg.ok { color: var(--ok); }

/* ---------- room head ---------- */
.room-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.room-meta { display: flex; align-items: center; gap: 7px; font-size: 12.5px; margin-bottom: 4px; }
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted); flex: none;
  transition: background .2s;
}
.dot.on { background: var(--ok); box-shadow: 0 0 8px rgba(62, 207, 142, .7); }
.dot.off { background: var(--warn); }

/* ---------- created link ---------- */
.created {
  margin-top: 16px; padding: 14px;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius);
}
.created-title { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.share-row { display: flex; align-items: center; gap: 10px; }
.share-url {
  flex: 1; min-width: 0; font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--accent); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
#created-expiry { margin-top: 8px; }

/* ---------- drop zone ---------- */
.drop {
  border: 1.5px dashed #394154;
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  outline: none;
  margin-top: 16px;
}
.drop:hover, .drop:focus-visible { border-color: var(--accent); background: rgba(76, 141, 255, .05); }
.drop.over { border-color: var(--accent); background: rgba(76, 141, 255, .1); }
.drop-icon { font-size: 20px; color: var(--accent); margin-bottom: 6px; }
.link { color: var(--accent); text-decoration: underline; }

/* ---------- uploads ---------- */
.uploads { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.up {
  background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 10px; padding: 9px 12px;
}
.up-top { display: flex; justify-content: space-between; gap: 10px; font-size: 12.5px; }
.up-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.up-stat { color: var(--muted); flex: none; font-variant-numeric: tabular-nums; }
.bar { height: 5px; background: #0e1116; border-radius: 3px; overflow: hidden; margin-top: 7px; }
.bar > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .15s linear; }
.up.done .bar > i { background: var(--ok); }
.up.fail .bar > i { background: var(--err); }
.up.fail .up-stat { color: var(--err); }

/* ---------- lists ---------- */
.section-title {
  font-size: 13px; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: .06em;
  margin: 22px 0 10px;
}
.files { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.file {
  display: flex; align-items: center; gap: 12px;
  background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px;
}
.file:hover { border-color: #3d4557; }
.file-main { flex: 1; min-width: 0; }
.file-name {
  display: block; color: var(--fg); text-decoration: none;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
a.file-name:hover { color: var(--accent); }
.file-sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.file-actions { display: flex; gap: 6px; flex: none; }
.empty { font-size: 13.5px; margin: 4px 0 0; }
.foot { color: #545c6b; font-size: 12px; padding: 22px 0 6px; }

@media (max-width: 480px) {
  .card { padding: 18px; border-radius: 14px; }
  .title { font-size: 20px; }
  .share-url { font-size: 11.5px; }
}