:root {
  --bg: #0c1110;
  --panel: #131b19;
  --panel2: #1a2422;
  --line: #263330;
  --text: #d8e2de;
  --dim: #7d8d88;
  --accent: #00d492;
  --accent2: #00b37a;
  --warn: #ffb454;
  --err: #ff6b6b;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font: 15px/1.6 -apple-system, "Segoe UI", "Noto Sans SC", sans-serif;
  min-height: 100vh;
}
header {
  display: flex; align-items: center; gap: 16px;
  padding: 10px 20px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: rgba(12,17,16,.92); backdrop-filter: blur(6px);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand .sub { color: var(--dim); font-size: 12px; margin-left: 4px; }
.logo { width: 22px; height: 22px; }
nav { display: flex; gap: 4px; flex: 1; }
nav button {
  background: none; border: none; color: var(--dim); padding: 6px 14px;
  font-size: 14px; cursor: pointer; border-radius: 6px;
}
nav button.active { color: var(--accent); background: var(--panel2); }
main { max-width: 780px; margin: 0 auto; padding: 20px 16px 60px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin-top: 16px; }
h2 { margin: 0 0 6px; font-size: 17px; }
h3 { margin: 0 0 4px; font-size: 15px; }
.hint { color: var(--dim); font-size: 13px; }
.hint.warn { color: var(--warn); }
textarea, input, select {
  width: 100%; background: var(--panel2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px;
  font: inherit; margin-top: 10px;
}
textarea { resize: vertical; }
.row { display: flex; gap: 10px; margin-top: 12px; align-items: center; flex-wrap: wrap; }
.row input, .row select { margin-top: 0; flex: 1; min-width: 120px; }
button {
  border: none; border-radius: 8px; padding: 10px 18px; font: inherit;
  cursor: pointer; color: #06120e; font-weight: 600;
}
button.primary { background: var(--accent); }
button.primary:hover { background: var(--accent2); }
button.ghost { background: transparent; color: var(--dim); border: 1px solid var(--line); }
button.ghost:hover { color: var(--text); }
button.danger { color: var(--err); }
button:disabled { opacity: .5; cursor: default; }
.result { margin-top: 16px; }
.link-box {
  background: var(--panel2); border: 1px solid var(--line); border-radius: 8px;
  padding: 12px; word-break: break-all;
}
.link-box code { color: var(--accent); font-size: 13px; }
#drop-file-zone { margin-top: 10px; }
#drop-file-zone.drag { outline: 2px dashed var(--accent); outline-offset: 4px; border-radius: 8px; }
#drop-file-name { color: var(--accent); font-size: 13px; margin-top: 4px; }
/* 读取视图 */
#read-text {
  background: var(--panel2); border: 1px solid var(--line); border-radius: 8px;
  padding: 14px; white-space: pre-wrap; word-break: break-all; font: 13px/1.5 ui-monospace, monospace;
  max-height: 50vh; overflow: auto; margin-top: 10px;
}
#read-file-meta { margin-top: 10px; font-size: 14px; }
/* 聊天 */
.chat-head { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.chat-head span { color: var(--dim); font-size: 13px; flex: 1; }
#chat-msgs {
  height: 46vh; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px;
  background: var(--panel2); padding: 12px; display: flex; flex-direction: column; gap: 8px;
}
.msg { max-width: 85%; padding: 8px 12px; border-radius: 10px; background: var(--panel); border: 1px solid var(--line); font-size: 14px; word-break: break-word; }
.msg.mine { align-self: flex-end; border-color: var(--accent2); background: #10201a; }
.msg .meta { font-size: 11px; color: var(--dim); margin-bottom: 2px; }
.msg .filecard { display: flex; gap: 8px; align-items: center; color: var(--accent); cursor: pointer; }
.chat-input { margin-top: 10px; }
.filelabel { cursor: pointer; border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; color: var(--dim); }
/* 收件箱管理 */
.inbox-item { border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-top: 10px; background: var(--panel2); }
.inbox-item .meta { font-size: 12px; color: var(--dim); display: flex; gap: 8px; align-items: center; }
.inbox-item pre { background: var(--panel); padding: 10px; border-radius: 6px; white-space: pre-wrap; word-break: break-all; margin: 8px 0 0; max-height: 200px; overflow: auto; }
/* dialog */
dialog {
  background: var(--panel); color: var(--text); border: 1px solid var(--line);
  border-radius: 12px; padding: 20px; min-width: 300px;
}
dialog::backdrop { background: rgba(0,0,0,.6); }
/* toast */
#toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #06120e; padding: 10px 20px; border-radius: 8px;
  font-weight: 600; z-index: 10; box-shadow: 0 4px 20px rgba(0,0,0,.5);
}
#toast.err { background: var(--err); color: #fff; }
@media (max-width: 600px) {
  header { padding: 8px 12px; gap: 8px; }
  nav { order: 3; width: 100%; }
  main { padding: 12px 10px 40px; }
  .row { gap: 8px; }
}

/* 口令短语框：可口头转述的大字短语 */
.link-box.phrase code {
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  word-break: break-all;
}