/* ============ Ark Designer — layout & chrome ============ */

:root {
    --accent: #4f46e5;
    --accent-soft: #eef2ff;
    --bg: #f4f6fa;
    --chrome: #ffffff;
    --border: #dde3ec;
    --text: #1f2937;
    --muted: #6b7280;
    --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 4px 14px rgba(15, 23, 42, .06);
    --radius: 8px;
    --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
    margin: 0;
    height: 100%;
    font-family: var(--font);
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
    overflow: hidden;
}

#app {
    display: grid;
    grid-template-areas:
        "topbar topbar topbar"
        "palette canvas panel"
        "status status status";
    grid-template-rows: 48px 1fr 28px;
    grid-template-columns: 236px 1fr 268px;
    height: 100vh;
}

/* ---------- Top bar ---------- */

#topbar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 10px;
    background: var(--chrome);
    border-bottom: 1px solid var(--border);
    z-index: 20;
    overflow-x: auto;
    scrollbar-width: none;
}
#topbar::-webkit-scrollbar { display: none; }

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 15px;
    color: var(--accent);
    padding-right: 8px;
    white-space: nowrap;
}
.brand-mark {
    width: 22px;
    height: 22px;
    stroke: var(--accent);
    stroke-width: 2;
    fill: var(--accent-soft);
}
.brand-logo {
    width: auto;
    height: 30px;
    max-width: 150px;
    object-fit: contain;
    flex: none;
}

.tb-link {
    font-size: 12.5px;
    font-weight: 600;
    color: #47506b;
    text-decoration: none;
    white-space: nowrap;
    padding: 7px 9px;
    border-radius: 6px;
    flex: none;
}
.tb-link:hover { background: var(--accent-soft); color: var(--accent); }

#diagram-name {
    width: 170px;
    padding: 6px 8px;
    border: 1px solid transparent;
    border-radius: 6px;
    font: inherit;
    font-weight: 600;
    color: var(--text);
    background: transparent;
}
#diagram-name:hover { border-color: var(--border); }
#diagram-name:focus { border-color: var(--accent); outline: none; background: #fff; }

.tb-group { display: flex; align-items: center; gap: 2px; }
.tb-sep { width: 1px; height: 24px; background: var(--border); margin: 0 6px; flex: none; }
.tb-spacer { flex: 1; }

.tb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 32px;
    height: 32px;
    padding: 0 6px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: #47506b;
    cursor: pointer;
    font: inherit;
    flex: none;
}
.tb-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.tb-btn:hover { background: #eef1f7; color: var(--text); }
.tb-btn:active { background: #e2e7f0; }
.tb-btn:disabled { opacity: .35; cursor: default; background: transparent; }
.tb-btn.toggle.active { background: var(--accent-soft); color: var(--accent); }
.tb-btn.wide span { font-size: 12.5px; font-weight: 600; }
.zoom-label { min-width: 52px; font-size: 12.5px; font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- Palette ---------- */

#palette {
    grid-area: palette;
    display: flex;
    flex-direction: column;
    background: var(--chrome);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    z-index: 10;
}

.pal-search { padding: 10px 10px 4px; }
.pal-search input {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font: inherit;
    font-size: 13px;
}
.pal-search input:focus { outline: none; border-color: var(--accent); }

.pal-group { padding: 4px 10px 8px; }
.pal-group h4 {
    margin: 8px 2px 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--muted);
}
.pal-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}
.pal-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 7px 2px 5px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    transition: border-color .12s, box-shadow .12s, transform .12s;
}
.pal-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}
.pal-item:active { cursor: grabbing; }
.pal-item svg { width: 46px; height: 34px; display: block; pointer-events: none; }
.pal-item .pal-name {
    font-size: 10.5px;
    color: var(--muted);
    text-align: center;
    line-height: 1.1;
    pointer-events: none;
}
.pal-item.hidden { display: none; }
.pal-item { position: relative; }
.pal-item img {
    width: 46px; height: 34px;
    object-fit: contain;
    display: block;
    pointer-events: none;
}
.pal-item .pal-del {
    position: absolute;
    top: 2px; right: 2px;
    display: none;
    width: 16px; height: 16px;
    padding: 0;
    border: none;
    border-radius: 8px;
    background: #e2e8f0;
    color: #475569;
    font-size: 12px;
    line-height: 14px;
    cursor: pointer;
}
.pal-item:hover .pal-del { display: block; }
.pal-item .pal-del:hover { background: #fecaca; color: #b91c1c; }
.pal-item.pal-add { border-style: dashed; border-width: 1.5px; }
.pal-item .pal-plus {
    font-size: 22px;
    line-height: 34px;
    color: var(--muted);
    pointer-events: none;
}

.pal-tip {
    margin: auto 10px 12px;
    padding: 10px;
    font-size: 11.5px;
    line-height: 1.45;
    color: var(--muted);
    background: var(--accent-soft);
    border-radius: var(--radius);
}
.pal-tip .dot {
    display: inline-block;
    width: 9px; height: 9px;
    border-radius: 50%;
    background: #3b82f6;
    border: 1.5px solid #fff;
    box-shadow: 0 0 0 1px #3b82f6;
    vertical-align: -1px;
}

/* ---------- Canvas ---------- */

#canvas-wrap {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    background: #fbfcfe;
}
#canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    outline: none;
    touch-action: none;
}
#canvas.panning { cursor: grab; }
#canvas.panning:active, #canvas.pan-active { cursor: grabbing; }
#canvas.conn-tool { cursor: crosshair; }

.node { cursor: move; }
.node text { user-select: none; -webkit-user-select: none; pointer-events: none; }
.node.drop-target .shape-main { filter: drop-shadow(0 0 4px rgba(59, 130, 246, .9)); }

.edge-hit { stroke: transparent; stroke-width: 14; fill: none; cursor: pointer; }
.edge-line { pointer-events: none; }
.edge-label-text { user-select: none; -webkit-user-select: none; cursor: pointer; paint-order: stroke; stroke: #fbfcfe; stroke-width: 4px; stroke-linejoin: round; }

.sel-box { fill: none; stroke: var(--accent); stroke-dasharray: 4 3; pointer-events: none; }
.handle { fill: #fff; stroke: var(--accent); cursor: pointer; }
.handle[data-dir="nw"], .handle[data-dir="se"] { cursor: nwse-resize; }
.handle[data-dir="ne"], .handle[data-dir="sw"] { cursor: nesw-resize; }
.handle[data-dir="n"], .handle[data-dir="s"] { cursor: ns-resize; }
.handle[data-dir="e"], .handle[data-dir="w"] { cursor: ew-resize; }

.port { fill: #3b82f6; stroke: #fff; cursor: crosshair; }
.port:hover, .port.hot { fill: #1d4ed8; }
.ep-handle { fill: #fff; stroke: var(--accent); cursor: move; }
.ep-handle:hover { fill: var(--accent-soft); }
.bend-handle { fill: #fff; stroke: var(--accent); }
.bend-handle:hover { fill: var(--accent-soft); }
.bend-handle.bend-x { cursor: ew-resize; }
.bend-handle.bend-y { cursor: ns-resize; }
.temp-edge { fill: none; stroke: #3b82f6; stroke-dasharray: 5 4; pointer-events: none; }
.marquee { fill: rgba(79, 70, 229, .08); stroke: var(--accent); stroke-dasharray: 4 3; pointer-events: none; }

/* Inline label editor */
#editor-layer { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
#editor-layer textarea, #editor-layer input {
    position: absolute;
    pointer-events: auto;
    border: 1.5px solid var(--accent);
    border-radius: 4px;
    background: rgba(255, 255, 255, .97);
    font-family: var(--font);
    color: var(--text);
    padding: 2px 4px;
    resize: none;
    overflow: hidden;
    text-align: center;
    box-shadow: var(--shadow);
}
#editor-layer textarea:focus, #editor-layer input:focus { outline: none; }

/* ---------- Right panel ---------- */

#panel {
    grid-area: panel;
    background: var(--chrome);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    padding: 12px;
    z-index: 10;
}

.panel-section h3 {
    margin: 14px 0 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--muted);
}
.panel-section h3:first-child { margin-top: 2px; }

.lbl { display: block; font-size: 11px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); margin: 4px 0 6px; }

.row { display: flex; gap: 8px; margin-bottom: 10px; align-items: flex-end; }
.row label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
    color: var(--muted);
    min-width: 0;
}
.row.two label { flex: 1; }
.row.four label { flex: 1; }
.row .grow { flex: 1; }
.row .val { float: right; color: var(--text); font-weight: 600; }
.row label .val { align-self: flex-end; margin-top: -18px; }

.row input[type="number"], .row input[type="text"], .row select {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font: inherit;
    font-size: 13px;
    color: var(--text);
    background: #fff;
}
.row input:focus, .row select:focus { outline: none; border-color: var(--accent); }

.row textarea {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font: inherit;
    font-size: 13px;
    color: var(--text);
    background: #fff;
    resize: vertical;
    min-height: 52px;
}
.row textarea:focus { outline: none; border-color: var(--accent); }

.row input[type="color"] {
    width: 100%;
    height: 30px;
    padding: 2px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
}
.row input[type="range"] { width: 100%; accent-color: var(--accent); }

.btnrow { align-items: center; }
.btnrow .gap { flex: 1; }
.mini {
    width: 30px; height: 28px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    font: inherit;
    font-size: 13px;
    color: var(--text);
}
.mini:hover { border-color: var(--accent); }
.mini.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.mini.text { width: auto; padding: 0 10px; }

.swatches { display: grid; grid-template-columns: repeat(8, 1fr); gap: 5px; margin-bottom: 10px; }
.swatch {
    aspect-ratio: 1;
    border-radius: 5px;
    border: 2px solid;
    cursor: pointer;
    padding: 0;
}
.swatch:hover { transform: scale(1.12); }

.hint-card {
    background: var(--accent-soft);
    border-radius: var(--radius);
    padding: 4px 12px 10px;
    font-size: 12.5px;
    line-height: 1.5;
    color: #3f4660;
    margin-bottom: 10px;
}
.hint-card ul { margin: 4px 0 0; padding-left: 16px; }
.hint-card li { margin-bottom: 3px; }

.stats { justify-content: space-between; color: var(--muted); font-size: 12px; }

.panel-btn {
    display: block;
    width: 100%;
    margin-bottom: 8px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    font: inherit;
    font-size: 13px;
    color: var(--text);
    cursor: pointer;
    text-align: left;
}
.panel-btn:hover { border-color: var(--accent); color: var(--accent); }
a.panel-btn { text-decoration: none; }

kbd {
    display: inline-block;
    padding: 1px 5px;
    border: 1px solid var(--border);
    border-bottom-width: 2px;
    border-radius: 4px;
    background: #fff;
    font-family: inherit;
    font-size: 11px;
}

/* ---------- Status bar ---------- */

#statusbar {
    grid-area: status;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 12px;
    background: var(--chrome);
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--muted);
    white-space: nowrap;
    z-index: 10;
}
.sb-spacer { flex: 1; }
.sb-sep { width: 1px; height: 14px; background: var(--border); }
#status-pos, #status-zoom { font-variant-numeric: tabular-nums; }

/* ---------- Modals ---------- */

.modal-back {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.modal {
    width: min(640px, 92vw);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, .3);
    overflow: hidden;
}
.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
}
.modal-head h2 { margin: 0; font-size: 16px; }
.modal-body { padding: 16px 18px; overflow-y: auto; }
.muted { color: var(--muted); }

.open-list { display: flex; flex-direction: column; gap: 6px; }
.open-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.open-row:hover { border-color: var(--accent); background: var(--accent-soft); }
.open-row .name { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.open-row .date { font-size: 12px; color: var(--muted); }
.open-row button {
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    font: inherit;
    font-size: 12.5px;
    cursor: pointer;
}
.open-row button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.open-row button:hover { filter: brightness(.96); }

.help-body { display: flex; gap: 24px; flex-wrap: wrap; }
.help-col { flex: 1; min-width: 220px; }
.help-col h4 { margin: 4px 0 8px; }
.help-col table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.help-col td { padding: 4px 6px 4px 0; border-bottom: 1px solid #f0f2f7; vertical-align: top; }
.help-col td:last-child { color: var(--muted); }

/* ---------- Context menu ---------- */

.ctx-menu {
    position: fixed;
    z-index: 120;
    min-width: 190px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 10px 34px rgba(15, 23, 42, .18);
    padding: 5px;
}
.ctx-menu button {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 7px 10px;
    border: none;
    border-radius: 6px;
    background: none;
    font: inherit;
    font-size: 13px;
    color: var(--text);
    cursor: pointer;
    text-align: left;
}
.ctx-menu button:hover { background: var(--accent-soft); color: var(--accent); }
.ctx-menu button .kbd { font-size: 11px; color: var(--muted); }
.ctx-menu hr { border: none; border-top: 1px solid var(--border); margin: 5px 4px; }

/* ---------- Toasts ---------- */

#toasts {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 150;
    pointer-events: none;
}
.toast {
    padding: 9px 16px;
    background: #111827;
    color: #f9fafb;
    font-size: 13px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    opacity: 0;
    translate: 0 8px;
    transition: opacity .18s, translate .18s;
}
.toast.show { opacity: 1; translate: 0 0; }
.toast.error { background: #b91c1c; }

/* Drag ghost from palette */
.drag-ghost {
    position: fixed;
    z-index: 200;
    pointer-events: none;
    opacity: .8;
}