/* ── 思维导图 · 样式 ── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.6;color:var(--text-primary);background-color:var(--bg-body);background-image:var(--bg-pattern,radial-gradient(circle,var(--border) 1px,transparent 1px));background-size:var(--bg-pattern-size,18px 18px);min-height:100vh;padding:20px}
body[data-theme="3"]{background-image:linear-gradient(135deg,#e8f0fe,#f3e8ff,#fce7f3,#e0f2fe)}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.app-layout{display:flex;min-height:100vh}
.sidebar{width:260px;min-width:260px;position:fixed;top:0;left:0;bottom:0;background:var(--bg-panel);border-right:1px solid var(--border);padding:20px 14px;display:flex;flex-direction:column;z-index:100;overflow-y:auto}
.sidebar-brand{font-family:Georgia,'Times New Roman',serif;font-size:1rem;font-weight:bold;color:var(--text-primary);text-decoration:none;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.sidebar-nav{list-style:none;flex:1}
.sidebar-nav li{margin-bottom:2px}
.sidebar-nav a{display:flex;align-items:center;gap:8px;padding:6px 10px;border-radius:2px;color:var(--text-secondary);text-decoration:none;font-size:.8rem;transition:all .15s}
.sidebar-nav a:hover{background:var(--button-bg);color:var(--text-primary)}
.sidebar-nav a.active{background:var(--button-bg);color:var(--accent);font-weight:600}
.sidebar-divider{height:1px;background:var(--border);margin:16px 0}
.main-content{margin-left:260px;flex:1;padding:20px 24px;display:flex;flex-direction:column}
.navbar{background:var(--bg-panel);border:1px solid var(--border);padding:10px 20px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;border-radius:2px;margin-bottom:12px}
.navbar-brand{font-family:Georgia,'Times New Roman',serif;font-size:1.05rem;font-weight:bold;color:var(--text-primary);text-decoration:none;white-space:nowrap}
.navbar-links{display:flex;flex-wrap:wrap;gap:2px;list-style:none}
.navbar-links a{display:inline-block;padding:6px 12px;border-radius:2px;color:var(--text-secondary);text-decoration:none;font-size:.82rem;font-weight:500}
.navbar-links a:hover{background:var(--button-bg);color:var(--text-primary)}
.navbar-links a.active{color:var(--accent);background:var(--button-bg)}
.navbar-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.panel{background:var(--bg-panel);border:1px solid var(--border);border-radius:2px;padding:16px}
.panel-header{font-family:Georgia,'Times New Roman',serif;font-size:.85rem;font-weight:bold;color:var(--text-primary);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.btn{background:var(--button-bg);color:var(--text-primary);border:1px solid var(--border);border-radius:2px;padding:6px 14px;font-size:.82rem;font-family:inherit;cursor:pointer;display:inline-flex;align-items:center;gap:5px;white-space:nowrap;box-shadow:inset 0 -2px 0 rgba(0,0,0,0.06);text-decoration:none}
.btn:hover{background:var(--button-hover)}.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:#fff;border:1px solid var(--accent)}.btn-primary:hover{background:var(--accent-hover)}
.btn-sm{padding:4px 10px;font-size:.76rem}
.btn-group{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.btn-success{background:var(--success);color:#fff;border:1px solid var(--success)}
.btn-danger{background:var(--error);color:#fff;border:1px solid var(--error)}
input[type="text"],input[type="number"],select{background:var(--bg-body);color:var(--text-primary);border:1px solid var(--border);border-radius:2px;padding:8px 10px;font-size:.84rem;width:100%;outline:none}
input:focus,select:focus{border-color:var(--accent)}
.mb-1{margin-bottom:8px}.mb-2{margin-bottom:12px}
.label-help{font-size:.76rem;color:var(--text-secondary);display:block;margin-bottom:4px}
.text-xs{font-size:.74rem}
.theme-toggle{background:var(--button-bg);border:1px solid var(--border);color:var(--text-primary);border-radius:2px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem}
.theme-toggle:hover{background:var(--button-hover)}
.status-bar{display:flex;align-items:center;gap:8px;padding:8px 14px;margin-top:10px;background:var(--bg-panel);border:1px solid var(--border);border-radius:2px;font-size:.76rem;color:var(--text-secondary)}

/* ── Mindmap specific ── */
.mindmap-workspace{display:flex;flex:1;gap:12px;min-height:0}
.mindmap-sidebar{width:240px;min-width:240px;background:var(--bg-panel);border:1px solid var(--border);border-radius:2px;padding:14px;overflow-y:auto;display:flex;flex-direction:column;gap:10px}
.mindmap-canvas-wrap{flex:1;background:var(--bg-panel);border:1px solid var(--border);border-radius:2px;position:relative;overflow:hidden;cursor:grab;min-height:500px}
#mindmapCanvas{display:block;width:100%;height:100%}
.mindmap-canvas-wrap.dragging{cursor:grabbing}
.mindmap-minimap{position:absolute;bottom:10px;right:10px;width:150px;height:100px;border:2px solid var(--border);border-radius:2px;background:rgba(255,255,255,0.8);z-index:10;pointer-events:none}
.node-edit-panel{background:var(--button-bg);border:1px solid var(--border);border-radius:4px;padding:8px;position:absolute;z-index:20;display:none;min-width:160px}
.node-edit-panel input{margin-bottom:6px}
.color-swatch{width:20px;height:20px;border-radius:50%;display:inline-block;cursor:pointer;border:2px solid transparent;margin:2px}
.color-swatch:hover,.color-swatch.active{border-color:var(--accent)}
.icon-picker{display:flex;flex-wrap:wrap;gap:4px;max-height:120px;overflow-y:auto;margin-top:6px}
.icon-picker span{font-size:1.1rem;cursor:pointer;padding:2px 4px;border-radius:2px}
.icon-picker span:hover,.icon-picker span.active{background:var(--accent);color:#fff}

/* ── Context Menu ── */
.mindmap-context-menu{position:fixed;z-index:9999;background:var(--bg-panel);border:1px solid var(--border);border-radius:4px;min-width:160px;box-shadow:0 4px 16px rgba(0,0,0,0.18);padding:4px 0;font-size:.78rem}
.mindmap-context-menu .ctx-item{padding:7px 14px;cursor:pointer;display:flex;align-items:center;gap:8px;color:var(--text-primary);transition:background .12s}
.mindmap-context-menu .ctx-item:hover{background:var(--button-bg)}
.mindmap-context-menu .ctx-item i{width:16px;text-align:center;font-size:.75rem;color:var(--text-secondary)}
.mindmap-context-menu .ctx-danger{color:var(--error)}
.mindmap-context-menu .ctx-danger:hover{background:var(--error);color:#fff}
.mindmap-context-menu .ctx-danger:hover i{color:#fff}
.mindmap-context-menu .ctx-sep{height:1px;background:var(--border);margin:4px 0}
.mindmap-context-menu .ctx-dot{width:12px;height:12px;border-radius:50%;display:inline-block;border:1px solid rgba(255,255,255,0.3)}

.hidden{display:none !important}

@media(max-width:768px){
  body{padding:10px}.sidebar{width:240px;min-width:240px}.main-content{margin-left:240px;padding:12px}
  .mindmap-workspace{flex-direction:column}.mindmap-sidebar{width:100%;min-width:100%;max-height:200px}
  .mindmap-canvas-wrap{min-height:400px}
}
@media(max-width:560px){
  .sidebar{position:relative;width:100%;min-width:100%;max-height:130px;flex-direction:row;flex-wrap:wrap;align-items:center;gap:6px;padding:8px 12px;border-right:none;border-bottom:1px solid var(--border)}
  .sidebar-nav{display:flex;flex-wrap:wrap;gap:2px;flex:none}.sidebar-nav a{padding:3px 6px;font-size:.7rem}
  .sidebar-divider{display:none}.main-content{margin-left:0;padding:8px}
}