/* ============================================================
   无限画布 · Infinite Canvas
   深色工作室风格：暖琥珀点缀 / 点阵网格 / 玻璃工具条
   ============================================================ */

:root{
  --bg-0:#0c0c10;
  --bg-1:#131318;
  --chrome:rgba(22,22,28,.86);
  --chrome-solid:#1a1a21;
  --hairline:rgba(255,255,255,.09);
  --hairline-2:rgba(255,255,255,.16);
  --ink:#f0ede6;
  --dim:#918d99;
  --dim-2:#5f5c66;
  --accent:#ffb454;
  --accent-soft:rgba(255,180,84,.16);
  --accent-ink:#221402;
  --danger:#ff6b6b;
  --note-1:#ffd66b; --note-2:#ff9ea9; --note-3:#9be0c0; --note-4:#9ecbff; --note-5:#d9c2ff;
  --sans:"Noto Sans SC",-apple-system,"PingFang SC",sans-serif;
  --serif:"Instrument Serif","Noto Serif SC",serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --shadow-panel:0 1px 0 rgba(255,255,255,.05) inset, 0 8px 28px rgba(0,0,0,.5), 0 2px 8px rgba(0,0,0,.4);
  --shadow-node:0 1px 2px rgba(0,0,0,.55), 0 14px 44px -12px rgba(0,0,0,.65);
}
*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none !important}
html,body{height:100%;overflow:hidden}
body{
  background:var(--bg-0);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  user-select:none;
  -webkit-user-select:none;
}
.mono{font-family:var(--mono)}
.dim{color:var(--dim)}
kbd{
  font-family:var(--mono);font-size:.86em;color:var(--ink);
  border:1px solid var(--hairline-2);border-bottom-width:2px;border-radius:5px;
  padding:1px 6px;background:rgba(255,255,255,.05);margin-right:7px;white-space:nowrap;
}

/* ================= viewport / camera ================= */
#viewport{
  position:fixed;inset:0;overflow:hidden;cursor:default;touch-action:none;
  background:radial-gradient(120% 90% at 50% 38%,#17171f 0%,#111116 58%,var(--bg-0) 100%);
}
#viewport.panning{cursor:grabbing}
body[data-tool="hand"] #viewport{cursor:grab}
#grid{position:absolute;inset:0;pointer-events:none}
/* world 必须有尺寸：文字节点是 shrink-to-fit，容器 0 宽会把它们压成一列竖排字 */
#world{position:absolute;top:0;left:0;width:100vw;height:100vh;transform-origin:0 0}
#edges{position:absolute;top:0;left:0;overflow:visible;pointer-events:none}
#edges path.hit{pointer-events:stroke;cursor:pointer}
body.connecting *{cursor:crosshair !important}

/* ================= nodes ================= */
.node{position:absolute;border-radius:12px}
/* 视觉层：负责裁切与阴影，port / handle 挂在 .node 上不被裁掉 */
.node .clip{
  position:absolute;inset:0;border-radius:inherit;overflow:hidden;
  box-shadow:var(--shadow-node);
}
.node.media .clip{border:1px solid var(--hairline-2);background:#000}
.node.media img,.node.media video{display:block;width:100%;height:100%;object-fit:cover;background:#000}
.node.broken .clip{background:#1b1b22;border:1px dashed var(--hairline-2);box-shadow:none}
.node.broken img,.node.broken video{display:none}
.node.broken .clip::after{
  content:"加载失败";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--dim-2);
}
.node.text .tbody{
  outline:none;white-space:pre-wrap;word-break:break-word;
  font-weight:600;line-height:1.42;color:var(--ink);
  text-shadow:0 2px 14px rgba(0,0,0,.5);
}
.node.text .tbody:empty::before{content:"输入文字";color:var(--dim-2)}
.node.note .clip{background:var(--note,var(--note-1));border-radius:6px}
.node.note .clip::after{ /* 折角 */
  content:"";position:absolute;right:0;bottom:0;width:16px;height:16px;
  background:linear-gradient(315deg,rgba(0,0,0,.16) 50%,transparent 50%);
}
.node.note .nbody{
  width:100%;height:100%;overflow:hidden;padding:14px 15px;outline:none;
  font-size:17px;line-height:1.55;color:#2b1f0a;word-break:break-word;white-space:pre-wrap;
}
.node.note .nbody:empty::before{content:"记点想法…";color:rgba(43,31,10,.38)}

/* selection */
.node.sel{outline:1.5px solid var(--accent);outline-offset:4px}
.node.drop-target{outline:2px dashed var(--accent);outline-offset:4px}

/* connection ports */
.port{
  position:absolute;width:13px;height:13px;border-radius:50%;z-index:7;cursor:crosshair;
  background:var(--bg-1);border:1.5px solid var(--accent);display:none;
  box-shadow:0 0 0 3px rgba(12,12,16,.55),0 0 12px rgba(255,180,84,.35);
}
.port::after{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--accent);opacity:0;transition:opacity .12s}
.port:hover::after{opacity:1}
.node:hover .port,.node.sel .port{display:block}
.port.n{left:50%;top:-7px;transform:translateX(-50%)}
.port.s{left:50%;bottom:-7px;transform:translateX(-50%)}
.port.e{right:-7px;top:50%;transform:translateY(-50%)}
.port.w{left:-7px;top:50%;transform:translateY(-50%)}

/* resize handles (single selection) */
.hdl{
  position:absolute;width:10px;height:10px;border-radius:2.5px;z-index:8;display:none;
  background:#fff;border:1.5px solid var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.5);
}
.node.sel.resizable .hdl{display:block}
.hdl.nw{left:-5.5px;top:-5.5px;cursor:nwse-resize}
.hdl.ne{right:-5.5px;top:-5.5px;cursor:nesw-resize}
.hdl.sw{left:-5.5px;bottom:-5.5px;cursor:nesw-resize}
.hdl.se{right:-5.5px;bottom:-5.5px;cursor:nwse-resize}

/* ================= edges ================= */
#edges path.line{fill:none;stroke:rgba(235,232,250,.30);stroke-width:1.6px;vector-effect:non-scaling-stroke;transition:stroke .15s}
#edges g:hover path.line{stroke:rgba(235,232,250,.62)}
#edges g.sel path.line{stroke:var(--accent);stroke-width:2px;stroke-dasharray:7 5;animation:edgeflow .7s linear infinite}
#edges path.arrow{fill:rgba(235,232,250,.55)}
#edges g:hover path.arrow{fill:rgba(235,232,250,.85)}
#edges g.sel path.arrow{fill:var(--accent)}
#edges path.hit{fill:none;stroke:transparent;stroke-width:16px;vector-effect:non-scaling-stroke}
@keyframes edgeflow{to{stroke-dashoffset:-12}}

/* ================= marquee ================= */
#marquee{
  position:fixed;border:1px solid var(--accent);
  background:rgba(255,180,84,.08);border-radius:2px;pointer-events:none;z-index:30;
}

/* ================= empty hint ================= */
#empty-hint{
  position:fixed;left:50%;top:50%;transform:translate(-50%,-52%);
  text-align:center;pointer-events:none;z-index:5;
  transition:opacity .5s;opacity:0;
}
#empty-hint.show{opacity:1}
#empty-hint .mark{
  font-family:var(--serif);font-style:italic;font-size:84px;line-height:1;
  color:var(--accent);text-shadow:0 0 60px rgba(255,180,84,.35);
}
#empty-hint .t{margin-top:18px;font-size:17px;font-weight:500;color:var(--dim)}
#empty-hint .chips{margin-top:22px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
#empty-hint .chip{
  font-size:12.5px;color:var(--dim);border:1px solid var(--hairline);
  background:rgba(255,255,255,.03);border-radius:99px;padding:7px 14px 7px 9px;
  backdrop-filter:blur(4px);
}
#empty-hint .chip kbd{margin-right:8px}

/* ================= drop hint ================= */
#drop-hint{position:fixed;inset:0;z-index:40;pointer-events:none}
#drop-hint .frame{
  position:absolute;inset:14px;border:1.5px dashed var(--accent);border-radius:14px;
  background:rgba(255,180,84,.05);
}
#drop-hint .label{
  position:absolute;left:50%;top:44px;transform:translateX(-50%);
  font-family:var(--mono);font-size:13px;letter-spacing:.14em;color:var(--accent);
  background:var(--chrome);border:1px solid rgba(255,180,84,.4);border-radius:99px;
  padding:9px 20px;backdrop-filter:blur(8px);
}

/* ================= top bar ================= */
#topbar{
  position:fixed;top:14px;left:16px;right:16px;z-index:50;
  display:flex;justify-content:space-between;align-items:flex-start;pointer-events:none;
}
#topbar .cluster{
  display:flex;align-items:center;gap:10px;pointer-events:auto;
  background:var(--chrome);border:1px solid var(--hairline);border-radius:11px;
  padding:7px 12px;backdrop-filter:blur(14px);box-shadow:var(--shadow-panel);
}
.brand{display:flex;align-items:baseline;gap:9px}
.brand .mark{
  font-family:var(--serif);font-style:italic;font-size:21px;color:var(--accent);
  transform:translateY(1px);
}
.brand .name{font-size:14px;font-weight:700;letter-spacing:.05em}
.brand .sub{font-family:var(--mono);font-size:9.5px;letter-spacing:.24em;color:var(--dim-2)}
.vline{width:1px;height:18px;background:var(--hairline);margin:0 3px}
#save-state{font-size:10.5px;letter-spacing:.06em;color:var(--dim-2)}

/* generic small icon button */
.btn{
  width:32px;height:32px;display:grid;place-items:center;position:relative;
  background:transparent;border:1px solid transparent;border-radius:8px;
  color:var(--dim);cursor:pointer;transition:all .15s;
}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.btn:hover{background:rgba(255,255,255,.06);color:var(--ink)}
.btn:disabled{opacity:.32;pointer-events:none}
.btn .qm{font-family:var(--mono);font-size:14px;font-weight:600}
.btn[data-tip]:hover::after{
  content:attr(data-tip);position:absolute;top:calc(100% + 9px);left:50%;transform:translateX(-50%);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.05em;white-space:nowrap;
  background:#0a0a0e;border:1px solid var(--hairline-2);border-radius:6px;
  color:var(--ink);padding:5px 9px;pointer-events:none;z-index:99;
}

/* ================= toolbar ================= */
#toolbar{
  position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:50;
  display:flex;align-items:center;gap:3px;padding:6px;
  background:var(--chrome);border:1px solid var(--hairline);border-radius:14px;
  backdrop-filter:blur(16px);box-shadow:var(--shadow-panel);
}
.tool{
  width:42px;height:42px;display:grid;place-items:center;position:relative;
  background:transparent;border:1px solid transparent;border-radius:10px;
  color:var(--dim);cursor:pointer;transition:all .15s;
}
.tool svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.tool:hover{background:rgba(255,255,255,.06);color:var(--ink)}
.tool.active{background:var(--accent-soft);color:var(--accent);border-color:rgba(255,180,84,.28)}
.tool[data-tip]:hover::after{
  content:attr(data-tip);position:absolute;bottom:calc(100% + 11px);left:50%;transform:translateX(-50%);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.05em;white-space:nowrap;
  background:#0a0a0e;border:1px solid var(--hairline-2);border-radius:6px;
  color:var(--ink);padding:5px 9px;pointer-events:none;z-index:99;
}
.sep{width:1px;height:22px;background:var(--hairline);margin:0 4px}

/* ================= zoom bar / status ================= */
#zoombar{
  position:fixed;right:16px;bottom:20px;z-index:50;
  display:flex;align-items:center;gap:3px;padding:5px;
  background:var(--chrome);border:1px solid var(--hairline);border-radius:11px;
  backdrop-filter:blur(14px);box-shadow:var(--shadow-panel);
}
#zoombar .pct{
  min-width:52px;text-align:center;font-size:11.5px;color:var(--ink);
  background:transparent;border:1px solid transparent;border-radius:7px;
  padding:7px 4px;cursor:pointer;
}
#zoombar .pct:hover{background:rgba(255,255,255,.06)}
#statusbar{
  position:fixed;left:18px;bottom:26px;z-index:40;font-size:10.5px;
  letter-spacing:.08em;color:var(--dim-2);pointer-events:none;
}
#coords{margin-left:18px}

/* ================= help modal ================= */
#help-mask{
  position:fixed;inset:0;z-index:90;background:rgba(8,8,11,.6);backdrop-filter:blur(6px);
  display:grid;place-items:center;
}
#help-panel{
  width:min(640px,92vw);background:var(--chrome-solid);border:1px solid var(--hairline-2);
  border-radius:16px;box-shadow:0 30px 90px rgba(0,0,0,.6);padding:26px 28px 20px;
  animation:pop .18s ease-out;
}
@keyframes pop{from{transform:scale(.96) translateY(8px);opacity:0}}
.hp-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.hp-title{font-size:18px;font-weight:700;display:flex;align-items:baseline;gap:10px}
.hp-title .mark{font-family:var(--serif);font-style:italic;font-size:24px;color:var(--accent)}
.hp-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px 34px}
.hp-sec h4{
  font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.3em;
  text-transform:uppercase;color:var(--accent);margin-bottom:12px;
}
.hp-sec p{font-size:12.8px;line-height:1.5;color:var(--dim);margin-bottom:9px;padding-left:2px}
.hp-foot{
  display:flex;justify-content:space-between;align-items:center;
  border-top:1px solid var(--hairline);margin-top:22px;padding-top:14px;
}
.hp-foot .mono{font-size:10.5px}
.danger{
  font-size:12.5px;color:var(--danger);background:rgba(255,107,107,.08);
  border:1px solid rgba(255,107,107,.35);border-radius:8px;padding:8px 16px;cursor:pointer;
  font-family:var(--sans);transition:all .15s;
}
.danger:hover{background:rgba(255,107,107,.16)}
.danger.arm{background:var(--danger);color:#1c0505;border-color:var(--danger);font-weight:700}

/* ================= toast ================= */
#toast{
  position:fixed;left:50%;bottom:84px;transform:translateX(-50%);z-index:80;
  font-size:11.5px;letter-spacing:.04em;color:var(--ink);
  background:var(--chrome-solid);border:1px solid var(--hairline-2);border-radius:99px;
  padding:9px 18px;box-shadow:var(--shadow-panel);pointer-events:none;
  animation:toastin .2s ease-out;
}
@keyframes toastin{from{transform:translate(-50%,8px);opacity:0}}

/* editing: allow text selection inside editors */
[contenteditable]{user-select:text;-webkit-user-select:text}