:root {
  --bg: #faf5f6;
  --panel: #ffffff;
  --border: #e2e4e8;
  --text: #1f2328;
  --muted: #8a8f98;
  --primary: #4a6cf7;
  --primary-hover: #3a5be0;
  --danger: #e5484d;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.16);
  /* 顶栏顶部下移量:桌面为 0;iOS Safari 顶部约 26px 被系统(状态栏/手势区)拦截 */
  --top-inset: 0px;
}

/* iOS Safari:fixed 元素顶部约 26px 被系统(状态栏/顶部手势区)拦截,触摸进不了页面。
   实测 top:0 完全点不到、top:26px 每下都能点,故下移 30px 留余量。
   只对触屏(coarse pointer + hover:none)生效,桌面 Safari(hover:hover)不受影响。 */
@media (hover: none) and (pointer: coarse) {
  @supports (-webkit-touch-callout: none) {
    :root {
      --top-inset: 30px;
    }
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* 顶栏 */
.toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(52px + var(--top-inset));
  padding-top: var(--top-inset);
  padding-right: max(16px, env(safe-area-inset-right));
  padding-left: max(16px, env(safe-area-inset-left));
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
  margin-right: 8px;
  user-select: none;
}
.brand .logo {
  font-size: 18px;
  color: var(--primary);
}

.toolbar-group {
  display: flex;
  gap: 8px;
}

.toolbar-spacer {
  flex: 1;
}

.selected-info {
  font-size: 13px;
  color: var(--muted);
  max-width: 320px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tb-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 7px 14px;
  font-size: 13px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  white-space: nowrap;
  /* 关键:本页锁死了滚动(body overflow:hidden + 全屏 fixed 画布 + touch-action:none),
     这种固定布局下 iOS 会把按钮上手指的轻微位移误判为「滚动/缩放手势」,
     触发 pointercancel 导致 click 不合成。none 禁止一切手势(连 pan/双击缩放也禁),
     让 iOS 不再做手势判断,点击立即合成。 */
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
}
.tb-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: #f6f8ff;
}
.tb-btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}
.tb-btn.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #fff;
}
.tb-btn.danger:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: #fff5f5;
}
.tb-btn.ai:hover {
  border-color: #f59e0b;
  color: #b45309;
  background: #fffbeb;
}
.tb-btn.ghost {
  border: none;
  background: transparent;
  padding: 4px 8px;
  font-size: 16px;
}
.tb-btn.ghost:hover {
  background: #f0f1f3;
  color: var(--text);
}
.tb-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: var(--border);
  color: var(--text);
  background: var(--panel);
}
.tb-btn:disabled:hover {
  border-color: var(--border);
  color: var(--text);
  background: var(--panel);
}

/* AI Token 输入框 */
.token-group {
  margin-left: 2px;
}
.token-input {
  width: 180px;
  padding: 7px 10px;
  font-size: 12px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  background: #fbfbfd;
  outline: none;
  transition: all 0.15s ease;
}
.token-input::placeholder {
  color: var(--muted);
}
.token-input:focus {
  border-color: var(--primary);
  background: #fff;
}

/* 视图区 */
.viewport {
  position: fixed;
  top: calc(52px + var(--top-inset));
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  background-color: var(--bg);
  background-image: radial-gradient(circle, #d8c9cd 1.2px, transparent 1.2px);
  background-size: 24px 24px;
  background-position: 0 0;
  cursor: default;
  touch-action: none;
}

.links-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
#links-wrap {
  transform-origin: 0 0;
  pointer-events: none;
}
#links-wrap g.link {
  pointer-events: auto;
  cursor: pointer;
}
#links-wrap path.link-hit {
  pointer-events: stroke;
}
#links-wrap text.link-label {
  pointer-events: auto;
  cursor: pointer;
}

/* 节点层:div 容器,绝对定位子元素,零尺寸 + overflow:visible 即可 */
.nodes-layer {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  width: 0;
  height: 0;
  overflow: visible;
  pointer-events: none;
}
.nodes-layer > * { pointer-events: auto; }

/* 空状态提示 */
.empty-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 13px;
  background: rgba(255, 255, 255, 0.85);
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  pointer-events: none;
  user-select: none;
  opacity: 0.9;
  transition: opacity 0.3s;
}

/* 节点卡片 */
.node {
  position: absolute;
  min-width: 120px;
  max-width: 260px;
  background: #fdf6e3;
  border: 1.5px solid var(--border);
  border-radius: 0;
  box-shadow: var(--shadow);
  padding: 10px 12px 12px;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}
.node:active { cursor: grabbing; }
.node.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.15), var(--shadow);
}
.node .node-text {
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
  outline: none;
  min-height: 1.5em;
  cursor: text;
}
.node .node-text[contenteditable="true"] {
  cursor: text;
  touch-action: auto; /* 编辑时允许浏览器原生文本手势(光标/选择) */
}


/* 连接点 */
.port {
  position: absolute;
  width: 14px;
  height: 14px;
  margin: -7px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--primary);
  cursor: crosshair;
  opacity: 0;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 5;
}
.node:hover .port, .node.selected .port {
  opacity: 1;
}
.port:hover {
  transform: scale(1.3);
  background: var(--primary);
}
.port.port-left  { left: 0;  top: 50%; }
.port.port-right { right: 0; top: 50%; }
.port.port-top   { left: 50%; top: 0; }
.port.port-bottom{ left: 50%; bottom: 0; }

/* 删除按钮 */
.node .del-btn {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}
.node:hover .del-btn, .node.selected .del-btn {
  display: flex;
}
.node .del-btn:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

/* 样式配置按钮(左上角) */
.node .style-btn {
  position: absolute;
  top: -10px;
  left: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  font-style: italic;
  line-height: 1;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}
.node:hover .style-btn, .node.selected .style-btn {
  display: flex;
}
.node .style-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* 缩放控制 */
.zoom-control {
  position: fixed;
  bottom: 18px;
  right: 18px;
  z-index: 90;
  display: flex;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 4px;
  box-shadow: var(--shadow);
}
.zoom-control button {
  border: none;
  background: transparent;
  width: 30px;
  height: 30px;
  font-size: 16px;
  cursor: pointer;
  border-radius: 6px;
  color: var(--text);
}
.zoom-control button:hover { background: #f0f1f3; }
.zoom-control .zoom-level {
  min-width: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--muted);
}


/* 连接类型菜单 */
.link-type-menu {
  position: fixed;
  z-index: 200;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 6px;
  min-width: 210px;
}
.link-type-menu .link-menu-title {
  font-size: 12px;
  color: var(--muted);
  padding: 6px 10px;
  font-weight: 600;
}
.link-type-menu.hidden,
.export-panel.hidden { display: none; }

.link-type-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
}
.link-type-item:hover { background: #f5f6f8; }
.link-type-item .lt-icon { font-size: 17px; }
.link-type-item .lt-arrow {
  width: 22px;
  height: 0;
  border-top-width: 2px;
  border-top-style: solid;
  position: relative;
  flex-shrink: 0;
}
.link-type-item .lt-arrow::after {
  content: "";
  position: absolute;
  right: -4px;
  top: -5px;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top-width: 8px;
  border-top-style: solid;
}
.link-type-item .lt-name { font-size: 13px; font-weight: 600; }
.link-type-item .lt-desc { font-size: 11px; color: var(--muted); margin-left: auto; }
.link-type-item .lt-badge {
  font-size: 10px;
  font-weight: 700;
  color: #b45309;
  background: #fde68a;
  border-radius: 999px;
  padding: 1px 8px;
  line-height: 1.5;
  flex-shrink: 0;
}
.link-type-item.link-recommend {
  background: #fffbeb;
  border-radius: 8px 8px 0 0;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 4px;
}
.link-type-item.link-recommend:hover { background: #fff4d1; }
.link-type-item.link-recommend.loading { opacity: 0.65; cursor: default; }


/* 导出面板 */
.export-panel {
  position: fixed;
  inset: 0;
  background: rgba(20, 23, 28, 0.42);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.export-box {
  width: min(680px, 92vw);
  max-height: 86vh;
  background: var(--panel);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.export-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  font-weight: 700;
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.export-text {
  flex: 1;
  min-height: 300px;
  border: none;
  outline: none;
  resize: none;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  font-family: inherit;
  color: var(--text);
  background: #fbfbfd;
}
.export-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  gap: 12px;
}
.export-foot #export-meta {
  font-size: 12px;
  color: var(--muted);
}
.export-actions { display: flex; gap: 8px; }

/* 导出面板模式切换 */
.export-tabs {
  display: flex;
  gap: 6px;
  padding: 10px 18px 0;
  border-bottom: 1px solid var(--border);
}
.export-tab {
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  color: var(--muted);
}
.export-tab:hover { color: var(--primary); border-color: var(--primary); }
.export-tab.active {
  background: #f6f8ff;
  color: var(--primary);
  border-color: var(--primary);
  font-weight: 600;
}

/* 样式配置面板 */
.style-panel {
  position: fixed;
  inset: 0;
  background: rgba(20, 23, 28, 0.42);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.style-panel.hidden { display: none; }
.style-box {
  width: min(240px, 88vw);
  max-height: 86vh;
  overflow: auto;
  background: var(--panel);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}
.style-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-weight: 700;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}
.style-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.style-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.style-label {
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
}
.style-font-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.font-size-btn {
  min-width: 28px;
  padding: 4px 0;
  border: 1px solid var(--border);
  background: var(--panel);
  font-size: 12px;
  cursor: pointer;
  border-radius: 0;
  color: var(--text);
}
.font-size-btn:hover { border-color: var(--primary); color: var(--primary); }
.font-size-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  font-weight: 600;
}
.palette {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
}
.swatch {
  aspect-ratio: 1;
  border: 1px solid rgba(0, 0, 0, 0.14);
  cursor: pointer;
  border-radius: 0;
  padding: 0;
}
.swatch:hover { transform: scale(1.08); }
.swatch.active {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}
.style-foot {
  display: flex;
  justify-content: flex-end;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
}

/* 导入文本面板提示 */
.import-hint { font-size: 12px; color: var(--muted); }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2328;
  color: #fff;
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 13px;
  z-index: 400;
  box-shadow: var(--shadow-lg);
  opacity: 0.95;
  transition: opacity 0.3s;
  pointer-events: none;
}
.toast.hidden { opacity: 0; }

/* 「更多」菜单按钮(小屏显示) */
.more-btn {
  display: none;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  /* 增大触摸目标,避免横屏下手指偏差点不准 */
  min-width: 44px;
  justify-content: center;
  position: relative;
  z-index: 2; /* 确保在 toolbar 内最上层,不被相邻 flex 项覆盖命中区域 */
}
.more-btn:active {
  background: #f0f1f3;
}

/* 移动端「更多」下拉菜单 */
.more-menu {
  position: fixed;
  top: calc(58px + var(--top-inset));
  right: 10px;
  right: max(10px, env(safe-area-inset-right));
  z-index: 120;
  min-width: 210px;
  max-width: calc(100vw - 20px);
  max-height: calc(100vh - 68px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.more-menu.hidden { display: none; }

.more-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 11px 12px;
  border: none;
  background: transparent;
  font-size: 14px;
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  /* 菜单项同样是按钮,点击优先;none 禁止手势避免吞掉 click */
  touch-action: none;
}
.more-item:hover { background: #f5f6f8; }
.more-item:disabled { opacity: 0.4; cursor: not-allowed; }

.more-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 2px;
}

.more-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 12px;
}
.more-field label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
}
.more-field .token-input { width: 100%; }

/* 小屏响应式:收起次要按钮到「更多」菜单 */
@media (max-width: 768px) {
  .brand-name { display: none; }
  .selected-info { display: none; }
  .toolbar { gap: 6px; padding-left: 8px; padding-right: 8px; }
  .toolbar [data-collapse] { display: none !important; }
  .more-btn { display: inline-flex; }

  /* 导出面板底部按钮在小屏换行 */
  .export-foot { flex-direction: column; align-items: stretch; }
  .export-actions { flex-wrap: wrap; }
}

/* 移动端横屏(触屏设备):同样收起次要按钮到「更多」菜单。
   同时用 hover:none 与 pointer:coarse 双条件,确保不同 iOS 版本的触屏判定都能命中 */
@media (orientation: landscape) and (hover: none),
       (orientation: landscape) and (pointer: coarse) {
  .selected-info { display: none; }
  .toolbar [data-collapse] { display: none !important; }
  .more-btn { display: inline-flex; }
  /* 横屏刘海在左/右边缘;覆盖小屏(如 iPhone SE 横屏仍 <768px 命中上方媒体查询)的 8px padding,避开刘海 */
  .toolbar {
    padding-left: max(8px, env(safe-area-inset-left));
    padding-right: max(8px, env(safe-area-inset-right));
  }
  /* 「更多」按钮远离右边缘:横屏下把按钮往左让,否则它贴边会被刘海/圆角
     遮挡或触发系统边缘手势,是「点不到」的直接原因之一。 */
  .more-btn {
    margin-right: max(6px, calc(env(safe-area-inset-right) + 8px));
  }
  /* 横屏高度很矮,菜单从工具栏正下方展开。刘海/圆角在右边缘,故把菜单
     额外往左移(让出右侧 safe-area + 一段余量),避免菜单右侧项被系统
     圆角/Home 指示条遮挡或触发边缘手势;同时收紧最大宽度,防止因 right
     增大导致菜单左缘超出屏幕左侧。 */
  .more-menu {
    top: calc(52px + 6px + var(--top-inset));
    right: max(16px, calc(env(safe-area-inset-right) + 32px));
    bottom: max(10px, env(safe-area-inset-bottom));
    max-height: none;
    max-width: calc(100vw - 88px);
    /* 横屏高度有限,改两列网格避免菜单太高或需要滚动 */
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: min-content;
    align-content: start;
    gap: 4px;
  }
  /* 分隔线与 Token 输入项占满整行 */
  .more-menu .more-divider,
  .more-menu .more-field {
    grid-column: 1 / -1;
  }
  .more-menu .more-item {
    width: 100%;
  }
}