:root {
  color-scheme: light dark;
  --bg: #fbfbfa;
  --fg: #1d1d1b;
  --muted: #6b6b66;
  --line: #d9d9d4;
  --box: #ffffff;
  --accent: #2456d6;
  --ok: #1f7a3a;
  --bad: #b3261e;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #ececea;
    --muted: #9a9a94;
    --line: #34342f;
    --box: #1f1f1d;
    --accent: #7ea2ff;
    --ok: #6fcf8a;
    --bad: #ff8a80;
  }
}

* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
.bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--mono);
  font-size: 17px;
  color: inherit;
  text-decoration: none;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 8px 16px 48px;
}
section {
  margin-top: 28px;
}
h2 {
  margin: 0 0 10px;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
h3 {
  margin: 0 0 12px;
  font-size: 16px;
}
.muted {
  color: var(--muted);
}
.foot {
  margin-top: 32px;
  font-size: 13px;
}
code {
  font-family: var(--mono);
  font-size: 0.92em;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}
button {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--box);
  cursor: pointer;
}
button:hover:not(:disabled) {
  border-color: var(--accent);
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
@media (prefers-color-scheme: dark) {
  button.primary {
    color: #10131c;
  }
}
button.wide {
  width: 100%;
}
button.link {
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  text-decoration: underline;
}
input,
textarea {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--box);
}
textarea {
  display: block;
  width: 100%;
  resize: vertical;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
#join-code {
  width: 8.5em;
  font-family: var(--mono);
  letter-spacing: 0.12em;
}

/* =========================================
   设备列表 & 圆形卡片 (尺寸优化版)
   ========================================= */
.peers {
  list-style: none;
  margin: 0;
  padding: 15px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}
#code-peers {
  margin-top: 10px;
}

/* 圆形卡片核心设计 */
.device-card {
  position: relative;
  width: 110px;
  height: 110px;
  border: 2px solid var(--line);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--box);
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
  overflow: visible;
}
.device-card:hover {
  transform: scale(1.02);
  border-color: var(--accent);
}
.device-card.target {
  background-color: color-mix(in srgb, var(--accent) 10%, transparent);
  border-color: var(--accent);
  border-style: dashed;
}
.device-card.busy {
  background: conic-gradient(var(--accent) var(--p), var(--box) 0);
}

/* 图标样式 */
.device-icon svg {
  width: 32px;
  height: 32px;
  margin-bottom: 4px;
}
.device-icon.mobile svg {
  color: var(--accent); /* 手机蓝色 */
}
.device-icon.pc svg {
  color: #333;
}
.device-icon.tablet svg {
  color: #666;
}

/* 设备名称 */
.device-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  max-width: 85px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 悬浮右下角的操作按钮 */
.action-icons {
  position: absolute;
  bottom: -5px;
  right: -5px;
  display: flex;
  gap: 4px;
  background: var(--bg);
  padding: 3px;
  border-radius: 16px;
}
.action-btn {
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: bold;
  background: var(--box);
  cursor: pointer;
  color: var(--fg);
  transition: all 0.2s;
}
.action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.action-btn svg {
  width: 14px;
  height: 14px;
}

/* 空状态提示 */
.empty {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border: 1px dashed var(--line);
  border-radius: 8px;
}
.empty p {
  margin: 0;
  color: var(--muted);
}
.peers:not(:empty) + .empty {
  display: none;
}
.qr {
  flex: none;
  width: 112px;
  color: var(--fg);
}
.qr svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Code */
.code-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--box);
}
.code-box p {
  margin: 0;
}
.code {
  margin: 4px 0 12px !important;
  font: 700 40px/1.1 var(--mono);
  letter-spacing: 0.06em;
}

/* Transfers */
.transfers {
  list-style: none;
  margin: 0;
  padding: 0;
}
.transfer {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.t-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 12px;
}
.t-title {
  font-weight: 600;
  overflow-wrap: anywhere;
}
.via {
  margin-right: 8px;
  font: 12px var(--mono);
  color: var(--accent);
}
.via:empty {
  display: none;
}
.t-status {
  color: var(--muted);
}
.transfer[data-state="done"] .t-status {
  color: var(--ok);
}
.transfer[data-state="failed"] .t-status {
  color: var(--bad);
}
progress {
  display: block;
  width: 100%;
  height: 6px;
  margin-top: 8px;
  accent-color: var(--accent);
}
.received {
  display: grid;
  gap: 8px;
  margin-top: 8px;
}
.received:empty {
  display: none;
}
.file {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: inherit;
  text-decoration: none;
  overflow-wrap: anywhere;
}
.file:hover {
  border-color: var(--accent);
}
.text {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border-left: 3px solid var(--accent);
  background: var(--box);
}
.message {
  flex: 1;
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.message a {
  color: var(--accent);
}

/* =========================================
   弹窗 (Dialogs) & 接收确认
   ========================================= */
dialog {
  width: min(340px, calc(100vw - 32px));
  padding: 24px;
  border: none;
  border-radius: 14px;
  background: var(--box);
  color: var(--fg);
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  text-align: center;
}
dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}
dialog h3 {
  margin: 0 0 16px;
  font-size: 18px;
}
dialog label {
  display: block;
  margin: 14px 0 6px;
  font-size: 13px;
  text-align: left;
}
dialog input[type="text"] {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-align: center;
}
.actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
}
.actions button {
  flex: 1;
  padding: 10px 0;
  border-radius: 8px;
}

/* 弹窗中的文件列表 */
.files {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  text-align: left;
}
.files li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  overflow-wrap: anywhere;
}

/* 收到的文本内容展示区 */
.received-text {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 14px;
  border-radius: 8px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 16px;
  word-break: break-all;
  font-size: 14px;
  white-space: pre-wrap;
  text-align: left;
}

/* Overlay 拖拽遮罩 */
.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  pointer-events: none;
}
.overlay p {
  font: 600 18px var(--mono);
}