/* ============ Flow Studio ============ */
:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --canvas: #e9edf4;
  --dot: #c3ccdb;
  --node: #ffffff;
  --node-2: #f5f7fb;
  --panel: #fbfcfe;
  --border: #d7deea;
  --border-strong: #c2cbdb;
  --ink: #1a2130;
  --muted: #5c6779;
  --faint: #8b95a8;

  --c-trigger: #e0952a;
  --c-control: #6d5ef0;
  --c-ai:      #0fabc0;
  --c-external:#f0685c;
  --c-data:    #4f86ef;
  --c-output:  #23a86e;
  --c-note:    #caa23a;

  --ok: #23a86e;
  --warn: #e0952a;
  --bad: #e6564b;
  --accent: var(--c-ai);

  --shadow: 0 1px 2px rgba(20,30,50,.06), 0 6px 20px rgba(20,30,50,.08);
  --shadow-hi: 0 2px 6px rgba(20,30,50,.10), 0 16px 44px rgba(20,30,50,.17);
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas:#10131a; --dot:#242b39; --node:#1a1f2b; --node-2:#151a24; --panel:#161b25;
    --border:#2b3342; --border-strong:#3a4457; --ink:#e9eef6; --muted:#97a2b6; --faint:#6b7688;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 26px rgba(0,0,0,.44);
    --shadow-hi: 0 2px 8px rgba(0,0,0,.5), 0 18px 48px rgba(0,0,0,.6);
  }
}
:root[data-theme="light"]{--canvas:#e9edf4;--dot:#c3ccdb;--node:#fff;--node-2:#f5f7fb;--panel:#fbfcfe;--border:#d7deea;--border-strong:#c2cbdb;--ink:#1a2130;--muted:#5c6779;--faint:#8b95a8;--shadow:0 1px 2px rgba(20,30,50,.06),0 6px 20px rgba(20,30,50,.08);--shadow-hi:0 2px 6px rgba(20,30,50,.10),0 16px 44px rgba(20,30,50,.17);}
:root[data-theme="dark"]{--canvas:#10131a;--dot:#242b39;--node:#1a1f2b;--node-2:#151a24;--panel:#161b25;--border:#2b3342;--border-strong:#3a4457;--ink:#e9eef6;--muted:#97a2b6;--faint:#6b7688;--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 26px rgba(0,0,0,.44);--shadow-hi:0 2px 8px rgba(0,0,0,.5),0 18px 48px rgba(0,0,0,.6);}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font-family: var(--font-sans); color: var(--ink); background: var(--canvas); overflow: hidden; -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.app { display: grid; grid-template-columns: 244px 1fr; grid-template-rows: 52px 1fr; height: 100vh; }
.app > .bar { grid-column: 1 / 3; }

/* ── top bar ── */
.bar { display: flex; align-items: center; gap: 14px; padding: 0 16px; background: color-mix(in srgb, var(--panel) 88%, transparent); border-bottom: 1px solid var(--border); z-index: 30; backdrop-filter: blur(8px); }
.bar .logo { display: flex; align-items: center; gap: 9px; font-weight: 680; font-size: 15px; letter-spacing: -.01em; }
.bar .logo .mark { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--c-ai), var(--c-control)); display: grid; place-items: center; color: #fff; }
.bar .logo .mark svg { width: 13px; height: 13px; }
.bar .wfname { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.bar .wfname b { color: var(--ink); font-weight: 620; }
.bar .spacer { flex: 1; }
.bar .save-status { font-size: 12px; font-family: var(--font-mono); color: var(--faint); display: flex; align-items: center; gap: 6px; min-width: 96px; }
.bar .save-status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.bar .save-status.saved .dot { background: var(--ok); }
.bar .save-status.saving .dot { background: var(--warn); animation: pulse 1s infinite; }
.bar .save-status.dirty .dot { background: var(--warn); }
.bar .save-status.error .dot { background: var(--bad); }
@keyframes pulse { 50% { opacity: .35; } }

.btn { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border-strong); background: var(--node); color: var(--ink); font-size: 12.5px; font-weight: 550; transition: background .14s, border-color .14s, transform .05s; }
.btn:hover { background: var(--node-2); }
.btn:active { transform: translateY(1px); }
.btn svg { width: 15px; height: 15px; }
.btn.primary { background: var(--accent); border-color: transparent; color: #fff; }
.btn.primary:hover { filter: brightness(1.06); background: var(--accent); }
.btn.icon { width: 32px; padding: 0; justify-content: center; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--node-2); }

/* ── left sidebar (library) ── */
.side { background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; min-height: 0; z-index: 20; }
.side .side-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 14px 8px; }
.side .side-head h2 { margin: 0; font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); font-weight: 700; }
.side .list { overflow-y: auto; padding: 4px 8px 12px; display: flex; flex-direction: column; gap: 3px; }
.wf-item { text-align: left; width: 100%; background: transparent; border: 1px solid transparent; border-radius: 9px; padding: 9px 10px; display: flex; flex-direction: column; gap: 3px; transition: background .12s, border-color .12s; }
.wf-item:hover { background: var(--node-2); }
.wf-item.active { background: color-mix(in srgb, var(--accent) 12%, var(--node)); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.wf-item .wf-title { font-size: 13px; font-weight: 600; letter-spacing: -.005em; display: flex; align-items: center; gap: 6px; }
.wf-item .wf-meta { font-size: 10.5px; font-family: var(--font-mono); color: var(--faint); }
.wf-item .wf-title .actions { margin-left: auto; display: none; gap: 2px; }
.wf-item:hover .wf-title .actions { display: flex; }
.wf-item .mini { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--border); background: var(--node); display: grid; place-items: center; color: var(--muted); }
.wf-item .mini svg { width: 12px; height: 12px; }
.wf-item .mini:hover { color: var(--ink); background: var(--node-2); }
.side .side-foot { margin-top: auto; padding: 10px 12px; border-top: 1px solid var(--border); display: flex; gap: 8px; align-items: center; }

/* ── canvas ── */
.stage { position: relative; overflow: hidden; background: var(--canvas); }
.stage.grabbing { cursor: grabbing; }
.stage.linking { cursor: crosshair; }
.world { position: absolute; top: 0; left: 0; transform-origin: 0 0; will-change: transform; }
.grid { position: absolute; inset: -6000px; background-image: radial-gradient(var(--dot) 1.4px, transparent 1.4px); background-size: 26px 26px; pointer-events: none; }
svg.wires { position: absolute; overflow: visible; pointer-events: none; left: 0; top: 0; }
svg.wires path.wire { fill: none; stroke-width: 2.4; pointer-events: stroke; cursor: pointer; }
svg.wires path.dep { stroke-dasharray: 3 5; stroke-width: 1.7; }
svg.wires path.hit { stroke: transparent; stroke-width: 16; fill: none; pointer-events: stroke; cursor: pointer; }
svg.wires path.sel { stroke-width: 3.4; filter: drop-shadow(0 0 3px var(--accent)); }
svg.wires path.temp { stroke: var(--accent); stroke-dasharray: 5 5; stroke-width: 2.4; fill: none; }

/* ── node ── */
.node { position: absolute; width: 250px; background: var(--node); border: 1px solid var(--border); border-radius: 13px; box-shadow: var(--shadow); overflow: visible; --accent: var(--c-ai); }
.node .card { border-radius: 13px; overflow: hidden; }
.node.sel { border-color: var(--accent); box-shadow: var(--shadow-hi), 0 0 0 2px color-mix(in srgb, var(--accent) 45%, transparent); }
.node.dragging { box-shadow: var(--shadow-hi); z-index: 10; }
.node .head { display: flex; align-items: center; gap: 9px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 13%, var(--node)), var(--node)); cursor: grab; }
.node .ico { width: 26px; height: 26px; border-radius: 7px; flex: none; display: grid; place-items: center; background: color-mix(in srgb, var(--accent) 18%, var(--node)); color: var(--accent); }
.node .ico svg { width: 15px; height: 15px; }
.node .kind { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); font-weight: 600; line-height: 1; }
.node .title { font-size: 13.5px; font-weight: 640; letter-spacing: -.005em; line-height: 1.2; margin-top: 3px; }
.node .body { padding: 9px 12px 11px; display: flex; flex-direction: column; gap: 5px; }
.node .li { display: flex; gap: 7px; font-size: 11.7px; color: var(--muted); line-height: 1.32; }
.node .li .b { color: var(--accent); flex: none; font-weight: 700; }
.node .li code { font-family: var(--font-mono); font-size: 10.6px; color: var(--ink); background: var(--node-2); padding: 0 4px; border-radius: 4px; }
.node .tags { display: flex; gap: 5px; margin-top: 5px; flex-wrap: wrap; }
.node .tg { font-family: var(--font-mono); font-size: 9px; letter-spacing: .05em; text-transform: uppercase; padding: 1px 5px; border-radius: 5px; border: 1px solid var(--border); color: var(--faint); }
.node .tg.note { color: var(--c-note); border-color: color-mix(in srgb, var(--c-note) 45%, var(--border)); background: color-mix(in srgb, var(--c-note) 12%, transparent); }
.node .tg.sample { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }

/* ports */
.port { position: absolute; width: 13px; height: 13px; border-radius: 50%; background: var(--node); border: 2px solid var(--border-strong); top: 50%; transform: translateY(-50%); z-index: 6; transition: transform .1s, border-color .1s; }
.port:hover, .port.armed { border-color: var(--accent); transform: translateY(-50%) scale(1.25); }
.port.out { right: -7px; cursor: crosshair; }
.port.in  { left: -7px; }
.node.droptarget { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 55%, transparent); }

/* ── zoom controls ── */
.zoomctl { position: absolute; left: 16px; bottom: 16px; display: flex; gap: 6px; align-items: center; background: color-mix(in srgb, var(--panel) 90%, transparent); border: 1px solid var(--border); border-radius: 10px; padding: 5px; box-shadow: var(--shadow); z-index: 15; backdrop-filter: blur(6px); }
.zoomctl button { width: 28px; height: 28px; border-radius: 7px; border: 1px solid transparent; background: transparent; display: grid; place-items: center; font-family: var(--font-mono); }
.zoomctl button:hover { background: var(--node-2); }
.zoomctl .zlabel { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); width: 42px; text-align: center; }

.addmenu { position: absolute; background: var(--node); border: 1px solid var(--border-strong); border-radius: 11px; box-shadow: var(--shadow-hi); padding: 6px; z-index: 60; display: none; min-width: 190px; }
.addmenu.open { display: block; }
.addmenu .ai { display: flex; align-items: center; gap: 9px; padding: 8px 9px; border-radius: 8px; cursor: pointer; font-size: 13px; }
.addmenu .ai:hover { background: var(--node-2); }
.addmenu .ai .sw { width: 20px; height: 20px; border-radius: 6px; display: grid; place-items: center; }
.addmenu .ai .sw svg { width: 12px; height: 12px; }

.empty { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; color: var(--muted); pointer-events: none; }
.empty .in { max-width: 320px; }
.empty h3 { color: var(--ink); font-size: 16px; margin: 0 0 6px; }
.empty p { font-size: 13px; line-height: 1.5; margin: 0; }

/* ── inspector drawer ── */
.scrim { position: fixed; inset: 0; background: rgba(10,14,22,.32); opacity: 0; pointer-events: none; transition: opacity .18s; z-index: 45; }
.scrim.open { opacity: 1; pointer-events: auto; }
.drawer { position: fixed; top: 0; right: 0; height: 100vh; width: 400px; max-width: 94vw; background: var(--panel); border-left: 1px solid var(--border); box-shadow: -18px 0 50px rgba(0,0,0,.22); transform: translateX(100%); transition: transform .24s cubic-bezier(.4,0,.2,1); z-index: 50; display: flex; flex-direction: column; --accent: var(--c-ai); }
.drawer.open { transform: none; }
.drawer .dhead { padding: 16px 18px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 10px; }
.drawer .dhead .dico { width: 32px; height: 32px; border-radius: 8px; display: grid; place-items: center; background: color-mix(in srgb, var(--accent) 16%, var(--node)); color: var(--accent); flex: none; }
.drawer .dhead .dico svg { width: 17px; height: 17px; }
.drawer .dhead .dt { font-size: 11px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .08em; color: var(--accent); }
.drawer .dhead .dn { font-size: 15px; font-weight: 640; margin-top: 1px; }
.drawer .dhead .close { margin-left: auto; width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--border-strong); background: var(--node); color: var(--muted); }
.drawer .dhead .close:hover { color: var(--ink); background: var(--node-2); }
.drawer .dbody { overflow-y: auto; padding: 16px 18px 40px; display: flex; flex-direction: column; gap: 16px; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field > label { font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); font-weight: 700; display: flex; align-items: center; gap: 6px; }
.field > label .hintico { color: var(--c-note); }
input.tin, textarea.tin, select.tin { font: inherit; font-size: 13px; color: var(--ink); background: var(--node); border: 1px solid var(--border-strong); border-radius: 8px; padding: 8px 10px; width: 100%; resize: vertical; }
textarea.tin { min-height: 62px; line-height: 1.45; }
textarea.tin.code { font-family: var(--font-mono); font-size: 11.5px; min-height: 90px; white-space: pre; }
input.tin:focus, textarea.tin:focus, select.tin:focus { border-color: var(--accent); outline: none; }
.field.note textarea.tin { background: color-mix(in srgb, var(--c-note) 8%, var(--node)); border-color: color-mix(in srgb, var(--c-note) 40%, var(--border-strong)); }

.rows { display: flex; flex-direction: column; gap: 7px; }
.row2 { display: grid; grid-template-columns: 42px 1fr auto; gap: 6px; align-items: center; }
.row2.tool { grid-template-columns: 1fr 1fr auto; }
.row2 input.tin { padding: 6px 8px; font-size: 12px; }
.rowdel { width: 28px; height: 28px; border-radius: 7px; border: 1px solid var(--border); background: var(--node); color: var(--faint); display: grid; place-items: center; flex: none; }
.rowdel:hover { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 45%, var(--border)); }
.addrow { align-self: flex-start; font-size: 12px; color: var(--accent); background: transparent; border: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--border)); border-radius: 7px; padding: 5px 10px; }
.addrow:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }

.seg { display: flex; gap: 4px; flex-wrap: wrap; }
.seg button { border: 1px solid var(--border-strong); background: var(--node); border-radius: 8px; padding: 6px 9px; font-size: 12px; display: flex; align-items: center; gap: 6px; }
.seg button .sw { width: 12px; height: 12px; border-radius: 4px; }
.seg button.on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, var(--node)); color: var(--ink); }
.iconpick { display: flex; gap: 4px; flex-wrap: wrap; }
.iconpick button { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border-strong); background: var(--node); display: grid; place-items: center; color: var(--muted); }
.iconpick button svg { width: 16px; height: 16px; }
.iconpick button.on { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--node)); }

.drawer .dfoot { border-top: 1px solid var(--border); padding: 12px 18px; display: flex; gap: 8px; }
.btn.danger { border-color: color-mix(in srgb, var(--bad) 45%, var(--border)); color: var(--bad); }
.btn.danger:hover { background: color-mix(in srgb, var(--bad) 12%, transparent); }

.divider { height: 1px; background: var(--border); border: 0; margin: 2px 0; }
.subtle { font-size: 12px; color: var(--muted); line-height: 1.5; }

/* toast */
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--canvas); font-size: 13px; padding: 9px 16px; border-radius: 10px; box-shadow: var(--shadow-hi); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 80; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: var(--bad); color: #fff; }

@media (max-width: 720px) {
  .app { grid-template-columns: 0 1fr; }
  .side { position: fixed; left: 0; top: 52px; bottom: 0; width: 244px; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow-hi); }
  .side.open { transform: none; }
}