/* FlashDrop 样式 —— 浅色、干净、移动端优先 */

:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #16181d;
  --ink-2: #5b6472;
  --ink-3: #8b94a3;
  --line: #e6e9ee;
  --line-2: #eef1f5;
  --accent: #2563eb;
  --accent-soft: #eef4ff;
  --ok: #16a34a;
  --warn: #d97706;
  --warn-soft: #fff7ed;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 6px 20px -8px rgba(16, 24, 40, .10);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

/* hidden 属性必须真的生效。
   .overlay{display:grid} / .banner{display:flex} 这类规则优先级高于 UA 的
   [hidden]{display:none}，不这样兜底的话「已隐藏」的遮罩层会一直盖在页面上。 */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
  padding-bottom: env(safe-area-inset-bottom);
}

h2 { font-size: 15px; margin: 0; font-weight: 650; letter-spacing: .01em; }
h3 { font-size: 17px; margin: 0 0 8px; font-weight: 650; }
p { margin: 0; }
b { font-weight: 650; }

code, .mono { font-family: var(--mono); }

/* ---------------- 顶栏 ---------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  padding-top: calc(10px + env(safe-area-inset-top));
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--accent);
}
.brand span { color: var(--ink); }

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--ink-2);
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--line-2);
  white-space: nowrap;
}
.status .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ink-3);
  flex: none;
}
.status-connected { background: #f0fdf4; color: #15803d; }
.status-connected .dot { background: var(--ok); }
.status-connecting .dot { background: var(--warn); animation: pulse 1.2s ease-in-out infinite; }
.status-offline { background: var(--danger-soft); color: var(--danger); }
.status-offline .dot { background: var(--danger); }

@keyframes pulse { 50% { opacity: .3; } }

/* ---------------- 布局 ---------------- */

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

/* 卡片右上角的一组按钮（如「全选 / 取消选择」） */
.head-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* 发送面板里的多播提示：列出会同时收到的那几台设备 */
#target-sub {
  font-size: 12.5px;
  color: var(--ink-3);
  margin: -6px 0 12px;
  line-height: 1.5;
  word-break: break-all;
}

.badge {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.target { color: var(--accent); }

/* ---------------- 二维码引导 ---------------- */

.connect-body {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-top: 12px;
}

.qr-holder {
  flex: none;
  width: 190px;
  height: 190px;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-holder svg, .qr-holder img { width: 100%; height: 100%; display: block; }
.qr-small { width: 140px; height: 140px; margin: 12px auto 4px; }

.connect-info { flex: 1; min-width: 0; }
.lead { color: var(--ink-2); }

.url-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0;
  padding: 8px 10px;
  background: var(--line-2);
  border-radius: var(--radius-sm);
}
.url-row code {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  overflow-wrap: anywhere;
  color: var(--ink);
}

.steps {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-2);
  font-size: 13.5px;
}
.steps li { margin-bottom: 4px; }

.notice {
  margin-top: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: var(--warn-soft);
  color: #92400e;
  border: 1px solid #fde3c4;
}
.notice-ok { background: #f0fdf4; color: #15803d; border-color: #c8f0d4; }

/* ---------------- 设备卡片 ---------------- */

.peer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
}

.peer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: #fff;
  transition: border-color .12s, background .12s, transform .12s;
  text-align: left;
  font: inherit;
  color: inherit;
  width: 100%;
}
.peer:hover { border-color: #c8d4e8; background: #fbfcfe; }
.peer:active { transform: scale(.985); }
.peer.selected { border-color: var(--accent); background: var(--accent-soft); }

.peer-avatar {
  flex: none;
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
}
.peer.selected .peer-avatar { background: #fff; }

.peer-meta { min-width: 0; flex: 1; }
.peer-name {
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.peer-sub {
  font-size: 11.5px;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 5px;
}
.peer-sub .mini-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--warn);
  flex: none;
}
.peer-sub.ready .mini-dot { background: var(--ok); }

.empty {
  color: var(--ink-3);
  font-size: 13.5px;
  text-align: center;
  padding: 14px 6px 6px;
}

/* 「附近设备」空状态里补一条跨网络的出路。
   背景：自动发现是按公网 IP 分房的，所以扫码只能发现**同一个网络**下的设备。
   电脑连 Wi-Fi、手机用流量时，两边房间不同，这里会一直是空的 ——
   用户就会以为「扫了没反应」。必须给一个明确的下一步。 */
.empty-wan {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed #e2e8f0;
}
.empty-wan button {
  display: block;
  margin: 9px auto 0;
}

/* ---------------- 发送区 ---------------- */

.dropzone {
  border: 1.5px dashed #cfd7e3;
  border-radius: var(--radius-sm);
  padding: 22px 16px;
  text-align: center;
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color .12s, background .12s;
  outline: none;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); background: #fafcff; }
.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone p { margin-top: 8px; }
.dropzone .sub { font-size: 12.5px; color: var(--ink-3); margin-top: 3px; }
.dropzone svg { color: var(--accent); }

.text-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  align-items: stretch;
}
textarea, .input {
  flex: 1;
  min-width: 0;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  resize: vertical;
  outline: none;
  transition: border-color .12s, box-shadow .12s;
}
textarea:focus, .input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
.input { flex: none; width: 100%; }
#pair-input { text-align: center; letter-spacing: .35em; font-size: 22px; font-family: var(--mono); }

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: background .12s, border-color .12s, opacity .12s;
  white-space: nowrap;
}
.btn:hover { background: #f7f9fc; border-color: #d5dce7; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-sm { padding: 5px 10px; font-size: 12.5px; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn-ghost:hover { background: var(--line-2); border-color: transparent; }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #1d4ed8; border-color: #1d4ed8; }

/* ---------------- 传输记录 ---------------- */

.activity-list { display: flex; flex-direction: column; gap: 10px; }

.act {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  font-size: 13.5px;
  background: #fff;
}
.act-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}
.act-title { font-weight: 600; min-width: 0; overflow-wrap: anywhere; }
.act-time { font-size: 11.5px; color: var(--ink-3); flex: none; }
.act-sub { font-size: 12.5px; color: var(--ink-2); margin-top: 2px; }

.bar {
  height: 5px;
  border-radius: 999px;
  background: var(--line-2);
  overflow: hidden;
  margin-top: 8px;
}
.bar > i {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--accent);
  transition: width .15s linear;
}
.act-done .bar > i { background: var(--ok); }
.act-warn { background: var(--warn-soft); border-color: #fde3c4; }
.act-error { background: var(--danger-soft); border-color: #fbd5d5; }

.act-actions {
  display: flex;
  gap: 8px;
  margin-top: 9px;
  flex-wrap: wrap;
}

.text-bubble {
  margin-top: 7px;
  padding: 9px 11px;
  background: var(--line-2);
  border-radius: var(--radius-sm);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-size: 13.5px;
  max-height: 220px;
  overflow-y: auto;
}

/* ---------------- 页脚 ---------------- */

.foot {
  max-width: 900px;
  margin: 0 auto;
  padding: 4px 16px 28px;
  color: var(--ink-3);
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.foot-line { display: flex; gap: 6px; flex-wrap: wrap; }
.foot-contact { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.foot-contact a {
  color: var(--ink-3);
  text-decoration: none;
  border-bottom: 1px dotted var(--line);
  word-break: break-all;
}
.foot-contact a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.relay-note { color: var(--warn); font-weight: 600; }

/* ---------------- 弹窗 ---------------- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(16, 22, 32, .42);
  backdrop-filter: blur(3px);
  display: grid;
  place-items: center;
  padding: 16px;
  overflow-y: auto;
}

.modal {
  width: 100%;
  max-width: 440px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 20px 50px -12px rgba(16, 24, 40, .3);
}

.muted { color: var(--ink-2); font-size: 13.5px; }
.small { font-size: 12px; }
.error { color: var(--danger); font-size: 13px; margin-top: 8px; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}
.modal-actions-left { justify-content: flex-start; margin-top: 12px; }

.file-list {
  list-style: none;
  margin: 12px 0;
  padding: 0;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.file-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 11px;
  font-size: 13.5px;
  border-bottom: 1px solid var(--line-2);
}
.file-list li:last-child { border-bottom: 0; }
.file-list .fname { overflow-wrap: anywhere; }
.file-list .fsize { color: var(--ink-3); flex: none; font-size: 12.5px; }

/* 接收能力提示：说明文件是「边收边写盘」还是「全攒内存」，后者会崩页 */
.receive-hint {
  margin: 10px 0 0;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--warn-soft);
  border: 1px solid #fde3c4;
  color: #92400e;
  font-size: 12.5px;
  line-height: 1.6;
}
.receive-hint.danger {
  background: var(--danger-soft);
  border-color: #fbd5d5;
  color: #991b1b;
  font-weight: 600;
}

.pair-code {
  font-family: var(--mono);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: .18em;
  text-align: center;
  color: var(--accent);
  margin: 14px 0 4px;
}

.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-3);
  font-size: 12.5px;
  margin: 18px 0 10px;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

.room-join-row { display: flex; gap: 8px; }
.room-join-row .input { flex: 1; text-transform: lowercase; }

/* ---------------- 提示条 ---------------- */

.banner {
  padding: 10px 16px;
  font-size: 13.5px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.banner-danger { background: var(--danger-soft); color: #991b1b; border-bottom: 1px solid #fbd5d5; }
.banner-text { display: flex; flex-direction: column; gap: 2px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 90;
  background: #16181d;
  color: #fff;
  font-size: 13.5px;
  padding: 10px 16px;
  border-radius: 999px;
  box-shadow: 0 10px 28px -8px rgba(0, 0, 0, .45);
  max-width: calc(100vw - 32px);
  text-align: center;
  animation: toast-in .18s ease-out;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } }

/* ---------------- 窄屏 ---------------- */

@media (max-width: 620px) {
  .connect-body { flex-direction: column; align-items: center; }
  .connect-info { width: 100%; }
  .qr-holder { width: 168px; height: 168px; }
  .topbar { flex-wrap: wrap; }
  .topbar-right { width: 100%; justify-content: flex-start; }
  .peer-grid { grid-template-columns: 1fr 1fr; }
  .peer { flex-direction: column; align-items: flex-start; gap: 8px; }
  .text-row { flex-direction: column; }
  .text-row .btn { width: 100%; }
  main { padding: 12px; gap: 12px; }
  .pair-code { font-size: 34px; }
}