/* ============================================================
 * 共享白板样式（兼容 iOS 9 Safari）
 * 注意：iOS 9 不支持 flex gap / CSS Grid / inset，全部用 margin + 显式定位
 * ============================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #eef1f5;
  font-family: -apple-system, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-text-size-adjust: 100%;
}
input, textarea, .modal-box, .join-card {
  -webkit-user-select: text;
  user-select: text;
}
button {
  font-family: inherit;
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid #c9d2dc;
  background: #ffffff;
  color: #333;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
button:active { background: #e3e9f0; }
button.primary { background: #1e88e5; border-color: #1e88e5; color: #fff; }
button.primary:active { background: #1565c0; }
button.danger { background: #e53935; border-color: #e53935; color: #fff; }
button.danger:active { background: #c62828; }
button.warning { background: #f9a825; border-color: #f9a825; color: #fff; }
button.warning:active { background: #f57f17; }
button.disabled, button[disabled] { opacity: 0.45; pointer-events: none; }
.hidden { display: none !important; }

.wb-root { position: fixed; left: 0; top: 0; width: 100%; height: 100%; }
#board {
  position: absolute;
  left: 0; top: 0;
  touch-action: none;
  background: #ffffff;
  cursor: crosshair;
}

/* ===== 顶部栏 ===== */
#topbar {
  position: fixed;
  left: 0; top: 0; right: 0;
  height: 46px;
  z-index: 20;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  padding: 0 10px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #dfe5ec;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
/* 子项禁止压缩：内容超宽时整体横向滚动而不是被压扁（iPad 等窄屏） */
#topbar > .brand,
#topbar > .room-info,
#topbar > .ro-badge,
#topbar > .top-actions {
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}
#topbar .brand { font-weight: 700; font-size: 15px; margin-right: 12px; white-space: nowrap; }
#topbar .room-info { font-size: 12px; color: #666; margin-right: 8px; white-space: nowrap; }
#roomName { max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; vertical-align: middle; }
#roomName.owner { color: #1e88e5; cursor: pointer; border-bottom: 1px dashed #1e88e5; -webkit-tap-highlight-color: transparent; }
#topbar .room-info b, #topbar .room-info span { vertical-align: middle; }
#topbar .top-actions {
  margin-left: auto;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
}
#topbar .top-actions button { margin-left: 4px; white-space: nowrap; }
#topbar .top-actions button.active { background: #1e88e5; border-color: #1e88e5; color: #fff; }
#topbar .top-actions .sep { width: 1px; height: 20px; background: #dfe5ec; margin: 0 8px; -webkit-flex-shrink: 0; flex-shrink: 0; }
#btnZoomLabel { min-width: 52px; text-align: center; background: #f5f7fa; }
.ro-badge {
  background: #e53935; color: #fff; font-size: 11px;
  padding: 3px 8px; border-radius: 10px; white-space: nowrap;
}

/* ===== 左侧工具栏 ===== */
#toolbar {
  position: fixed;
  left: 8px; top: 54px;
  z-index: 20;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-flex-direction: column;
  flex-direction: column;
  width: 60px;
}
#toolbar button {
  width: 60px;
  height: 44px;
  font-size: 12px;
  padding: 4px 2px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.10);
  margin-bottom: 5px;
}
#toolbar button.active {
  background: #1e88e5;
  border-color: #1e88e5;
  color: #fff;
  font-weight: 600;
}

/* ===== 右侧属性面板（可折叠） ===== */
#panel {
  position: fixed;
  right: 8px; top: 54px;
  z-index: 20;
  width: 180px;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid #dfe5ec;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.10);
  overflow: hidden;
}
#panel.collapsed { display: none; }
.panel-head {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  padding: 7px 8px 7px 12px;
  border-bottom: 1px solid #eef1f5;
  font-size: 13px;
  font-weight: 600;
  color: #444;
}
.panel-head button { font-size: 11px; padding: 3px 8px; }
#panelBody { padding: 10px; }
#panel.collapsed #panelBody { display: none; }
#panel .panel-title {
  font-size: 11px; color: #888; margin: 8px 0 4px;
  /* 文字左、操作按钮右，行高容纳描边/填充按钮，避免盖住下方色板 */
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  min-height: 22px;
}
#panel .panel-title:first-child { margin-top: 0; }
/* 描边 / 填充 颜色目标切换 */
.color-target { float: none; margin-left: 8px; -webkit-flex-shrink: 0; flex-shrink: 0; }
.color-target button {
  font-size: 10px; padding: 2px 7px; margin-left: 2px;
  border: 1px solid #c9d2dc; border-radius: 8px; background: #fff; color: #666;
}
.color-target button.active { background: #1e88e5; border-color: #1e88e5; color: #fff; }

.palette {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  width: 172px;
}
.palette .swatch {
  width: 22px; height: 22px;
  padding: 0; border-radius: 50%;
  border: 2px solid #d5dbe3;
  margin: 0 5px 5px 0;
}
.palette .swatch.active { border-color: #1e88e5; box-shadow: 0 0 0 2px rgba(30, 136, 229, 0.3); }
.palette .swatch.empty { background: #fff; }

/* ===== RGB 调色 ===== */
.rgb-preview-row {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  margin-bottom: 4px;
}
.rgb-preview {
  width: 30px; height: 24px;
  border-radius: 4px;
  border: 1px solid #c9d2dc;
  background: #000000;
}
#rgbHexInput {
  width: 76px; margin-left: 8px; padding: 3px 6px;
  font-size: 12px; border: 1px solid #c9d2dc; border-radius: 4px;
  height: 24px;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}
.rgb-row {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  margin-bottom: 2px;
}
.rgb-key {
  width: 14px;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
}
.rgb-key.rgb-r { color: #e53935; }
.rgb-key.rgb-g { color: #43a047; }
.rgb-key.rgb-b { color: #1e88e5; }
.rgb-row input[type="range"] { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; height: 22px; margin-left: 6px; }

.ctrl { margin-top: 10px; }
.ctrl-label { font-size: 12px; color: #444; margin-bottom: 4px; }
.ctrl-label b { color: #1e88e5; }
.ctrl input[type="range"] { width: 100%; height: 22px; }

/* ===== 滑块（range）统一样式：轨道与圆点在 iOS 上可见、可点按；已滑过部分由 JS 渐变着色 ===== */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  outline: none;
  /* 已滑过部分着色：JS 更新 backgroundImage 渐变，size 固定为 4px 居中轨道 */
  background-image: linear-gradient(to right, #1e88e5 0%, #1e88e5 0%, #d5dbe3 0%, #d5dbe3 100%);
  background-size: 100% 4px;
  background-position: center center;
  background-repeat: no-repeat;
}
input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: transparent; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #1e88e5;
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  margin-top: -6px; /* 圆点垂直居中于 4px 轨道 */
}
input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: transparent; }
input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: #1e88e5; border: 2px solid #fff; }
.zrow {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  width: 172px;
}
.zrow button { font-size: 12px; padding: 4px 8px; margin: 0 4px 0 0; }
.zrow + .zrow { margin-top: 2px; }
.sel-info { font-size: 12px; color: #666; word-break: break-all; }

/* ===== 全屏演示：隐藏所有菜单 ===== */
body.wb-present #topbar,
body.wb-present #toolbar,
body.wb-present #panel,
body.wb-present #usersBox,
body.wb-present #statusLine,
body.wb-present #roBadge { display: none !important; }
/* 隐藏工具栏后的右上角浮层：显示工具栏 / 全屏 两个按钮（蓝色胶囊） */
.present-actions {
  position: fixed;
  right: 12px; top: 12px;
  z-index: 40;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
}
.present-exit {
  position: static;
  background: rgba(30, 136, 229, 0.92);
  border-color: #1e88e5;
  color: #fff;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}
.present-exit:active { background: #1565c0; }
.present-actions .present-exit + .present-exit { margin-left: 8px; }

/* ===== 内联文本输入（文本工具点击画布后直接输入；半透明背景、可拖拽移动） ===== */
#inlineText {
  position: fixed;
  z-index: 25;
  border: 2px solid #1e88e5;
  border-radius: 6px;
  padding: 2px 6px;
  font-family: sans-serif;
  line-height: 1.3;
  resize: none;
  overflow: hidden; /* 去掉横竖滚动条，高度由 JS 按内容自适应 */
  background: rgba(255, 255, 255, 0.85); /* 半透明，不遮挡画布内容 */
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  text-align: left; /* 与最终渲染文本的左上角对齐一致，输入即所见 */
  -webkit-user-select: text;
  user-select: text;
}
/* 提示文字跟随输入框字号（默认 20px） */
#inlineText::-webkit-input-placeholder { color: #aaa; }
#inlineText::placeholder { color: #aaa; }

/* ===== 状态栏 / 用户列表 ===== */
#statusLine {
  position: fixed;
  left: 76px; bottom: 10px;
  z-index: 20;
  font-size: 12px;
  color: #555;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #dfe5ec;
  border-radius: 10px;
  padding: 4px 10px;
  max-width: 60%;
  pointer-events: none;
}
.users {
  position: fixed;
  left: 76px; top: 54px;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid #dfe5ec;
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 12px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.10);
}
.users .u-row {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  padding: 2px 0;
  white-space: nowrap;
}
.users .u-dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid rgba(0, 0, 0, 0.2); margin-right: 6px; }
.users .u-ro { color: #e53935; font-size: 10px; margin-left: 4px; }

/* ===== 弹窗 ===== */
.modal {
  position: fixed;
  left: 0; top: 0; right: 0; bottom: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.4);
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
}
.modal-box {
  width: 320px;
  max-width: 92%;
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.modal-box h3 { font-size: 16px; margin-bottom: 8px; }
.modal-box p { font-size: 12px; color: #666; margin-bottom: 8px; line-height: 1.5; }
.modal-box input[type="text"] {
  width: 100%; height: 34px; font-size: 13px;
  padding: 0 8px; border: 1px solid #c9d2dc; border-radius: 6px; margin-bottom: 8px;
}
.modal-box input[type="file"] { width: 100%; font-size: 12px; margin-bottom: 8px; }
.modal-box textarea {
  width: 100%;
  height: 76px;
  font-size: 14px;
  font-family: inherit;
  padding: 8px;
  border: 1px solid #c9d2dc;
  border-radius: 6px;
  margin-bottom: 8px;
  resize: none;
}
.modal-box label.check {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  margin-bottom: 6px;
  font-size: 13px;
  color: #333;
}
.modal-box label.check input { margin-right: 6px; }
.modal-box label.field {
  display: block;
  font-size: 12px;
  color: #666;
  margin-bottom: 8px;
}
.modal-box label.field input { margin-top: 4px; }
.config-actions {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  margin-bottom: 10px;
}
.config-actions button { -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; margin-right: 8px; }
.config-actions button:last-child { margin-right: 0; }
.modal-actions {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: end;
  -webkit-justify-content: flex-end;
  justify-content: flex-end;
  margin-top: 4px;
}
.modal-actions button { margin-left: 8px; }

/* ===== 加入页 ===== */
.join-body {
  overflow: auto;
  background: #eef1f5;
}
.join-wrap { max-width: 720px; margin: 40px auto 20px; padding: 0 16px; }
.join-head { text-align: center; margin-bottom: 24px; }
.join-head h1 { font-size: 28px; color: #1a1a2e; }
.join-head p { color: #777; font-size: 13px; margin-top: 6px; }
.join-cards {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
}
.join-card {
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 300px;
  flex: 1 1 300px;
  background: #fff;
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}
.join-card + .join-card { margin-left: 16px; }
@media (max-width: 700px) {
  .join-card + .join-card { margin-left: 0; margin-top: 16px; }
}
.join-card h2 { font-size: 17px; margin-bottom: 12px; color: #1a1a2e; }
.join-card label { display: block; font-size: 13px; color: #555; margin-bottom: 10px; }
.join-card input[type="text"] {
  width: 100%; height: 36px; font-size: 14px;
  padding: 0 10px; border: 1px solid #c9d2dc; border-radius: 8px; margin-top: 4px;
}
.join-card .primary { width: 100%; height: 38px; font-size: 15px; margin-top: 4px; }
.join-card .msg { font-size: 12px; margin-top: 8px; min-height: 16px; }
.join-card .msg.err { color: #e53935; }
.join-card .msg.ok { color: #43a047; }
.join-foot { text-align: center; color: #999; font-size: 12px; margin-top: 20px; }
.admin-link { color: #64748b; font-size: 12px; text-decoration: underline; }
.admin-link:hover { color: #1e88e5; }

/* ===== 管理员控制台（与白板风格一致：白底头部 / 同款按钮 / 白底圆角表格） ===== */
.admin-page {
  overflow: auto;
  background: #f5f7fa;
}
.admin-head {
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #dfe5ec;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  padding: 10px 20px;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}
.admin-head h1 { font-size: 16px; margin: 0; color: #222; }
.admin-head-links { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-align: center; -webkit-align-items: center; align-items: center; }
.admin-head-links a { color: #1e88e5; font-size: 13px; text-decoration: none; margin-right: 14px; }
.admin-head-links button { font-size: 12px; padding: 4px 10px; }
.admin-wrap { max-width: 960px; margin: 20px auto; padding: 0 16px; }
.admin-status {
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 10px;
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #dfe5ec;
  color: #555;
}
.admin-status.err { color: #c62828; background: #fdecea; border-color: #f5c6c0; }
.admin-status.ok { color: #2e7d32; background: #e8f5e9; border-color: #c8e6c9; }
.admin-toolbar {
  margin-bottom: 12px;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}
.admin-toolbar .row-right { display: -webkit-box; display: -webkit-flex; display: flex; -webkit-box-align: center; -webkit-align-items: center; align-items: center; }
.admin-toolbar .row-right button { margin-left: 8px; }
.admin-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid #dfe5ec; border-radius: 10px; overflow: hidden; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06); }
.admin-table th, .admin-table td { padding: 9px 10px; font-size: 13px; text-align: left; border-bottom: 1px solid #edf0f4; }
.admin-table th { background: #f8fafc; color: #475569; font-weight: 600; white-space: nowrap; }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table td.num { text-align: center; }
.admin-ops button { font-size: 12px; padding: 4px 10px; margin: 0 4px 2px 0; border-radius: 6px; }
.admin-ops .enter { background: #1e88e5; border-color: #1e88e5; color: #fff; }
.admin-ops .del { color: #c62828; border-color: #ef9a9a; }
.admin-empty { text-align: center; color: #94a3b8; padding: 40px 0; font-size: 14px; }
.admin-tag { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 10px; background: #eef2f7; color: #475569; }
.admin-tag.pwd { background: #fff3e0; color: #e65100; }