:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --border: #e2e4e9;
  --text: #1a1d29;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --confirm: #16a34a;
  --confirm-hover: #15803d;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --rail-w: 76px;
  --flyout-w: 300px;
  --ruler-size: 24px;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
}

button { font-family: inherit; }

.topbar {
  height: 56px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 16px;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.design-name input {
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 6px 10px;
  color: var(--text);
  background: transparent;
  width: 160px;
}
.design-name input:hover,
.design-name input:focus {
  border-color: var(--border);
  background: var(--bg);
  outline: none;
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease;
  white-space: nowrap;
}

.btn-block { width: 100%; }
.btn-lg { padding: 12px 14px; font-size: 15px; }
.btn.small { padding: 4px 8px; font-size: 13px; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

.btn-confirm { background: var(--confirm); }
.btn-confirm:hover { background: var(--confirm-hover); }

.btn-secondary { background: #fff; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: #f0f1f4; }
.btn-secondary.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.btn-danger { background: #fff; color: var(--danger); border-color: #f3caca; }
.btn-danger:hover { background: #fdecec; border-color: var(--danger-hover); }

.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover { background: #f0f1f4; color: var(--text); }

.icon-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}
.icon-btn:hover { background: var(--bg); color: var(--text); }

.row { display: flex; gap: 8px; margin-bottom: 10px; }
.row.two > * { flex: 1; }
.row.three > * { flex: 1; }

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 10px;
}

.field input[type="text"],
.field input[type="number"],
.field select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-weight: 500;
}

.field input[type="color"] {
  width: 100%;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.field.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.field .row input[type="color"] { flex: 1; width: auto; }

.palette {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
  margin-top: 8px;
}

.swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.12);
  cursor: pointer;
  padding: 0;
}
.swatch:hover { outline: 2px solid var(--accent); outline-offset: 1px; }

.svg-color-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.svg-color-row .swatch-static {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid rgba(0,0,0,0.12);
  flex-shrink: 0;
}
.svg-color-row input[type="color"] {
  flex: 1;
  height: 30px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.svg-color-row .arrow { color: var(--muted); font-size: 12px; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.center { text-align: center; }
.hidden { display: none !important; }

/* --- layout --- */

.layout {
  position: relative;
  display: grid;
  grid-template-columns: var(--rail-w) 1fr 280px;
  height: calc(100% - 56px);
}

/* --- left icon rail --- */

.rail {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 10px 6px;
  z-index: 5;
}

.rail-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  border-radius: 10px;
  padding: 10px 4px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}
.rail-btn svg { width: 22px; height: 22px; }
.rail-btn:hover { background: var(--bg); color: var(--text); }
.rail-btn.active { background: #eef2ff; color: var(--accent); }

.rail-spacer { flex: 1; }

.rail-footer {
  text-align: center;
  font-size: 10px;
  color: var(--muted);
  line-height: 1.4;
  padding: 8px 2px;
}

/* --- flyout panel --- */

.flyout {
  position: absolute;
  top: 0;
  left: var(--rail-w);
  bottom: 0;
  width: var(--flyout-w);
  background: var(--panel);
  border-right: 1px solid var(--border);
  box-shadow: 6px 0 16px rgba(0,0,0,0.04);
  z-index: 4;
  display: flex;
  flex-direction: column;
}

.flyout-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.flyout-header h3 { margin: 0; font-size: 15px; }

.flyout-body {
  padding: 16px;
  overflow-y: auto;
}

/* --- canvas area --- */

.canvas-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #ececef;
  overflow: hidden;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.zoom-controls input[type="range"] { width: 120px; }

.ruler-wrap {
  position: relative;
  flex: 1;
  display: grid;
  grid-template-columns: var(--ruler-size) 1fr;
  grid-template-rows: var(--ruler-size) 1fr;
  overflow: hidden;
}

.ruler-corner {
  background: var(--panel);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.ruler-x, .ruler-y {
  position: relative;
  background: var(--panel);
  overflow: hidden;
}
.ruler-x { grid-column: 2; grid-row: 1; border-bottom: 1px solid var(--border); }
.ruler-y { grid-column: 1; grid-row: 2; border-right: 1px solid var(--border); }

.tick {
  position: absolute;
  font-size: 9px;
  color: var(--muted);
}
.ruler-x .tick { top: 2px; border-left: 1px solid var(--border); padding-left: 2px; height: 100%; }
.ruler-y .tick { left: 2px; border-top: 1px solid var(--border); padding-top: 1px; width: 100%; writing-mode: vertical-rl; }

.canvas-scroll {
  grid-column: 2;
  grid-row: 2;
  overflow: auto;
  display: flex;
  justify-content: center;
  padding: 24px;
}

#stageContainer {
  height: max-content;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  outline: 1px solid #cbd0da;
  background-image:
    linear-gradient(45deg, #d8dae0 25%, transparent 25%),
    linear-gradient(-45deg, #d8dae0 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #d8dae0 75%),
    linear-gradient(-45deg, transparent 75%, #d8dae0 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: #f0f1f4;
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(79,70,229,0.06);
  border: 2px dashed var(--accent);
  color: var(--accent);
  font-weight: 600;
  pointer-events: none;
}

.drop-hint.active { display: flex; }

/* --- right summary panel --- */

.summary {
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
}

.summary h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 14px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  margin-bottom: 10px;
}

.summary-row.total {
  font-size: 18px;
}

.summary hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 14px 0;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1a1d29;
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 900px) {
  .layout { grid-template-columns: var(--rail-w) 1fr; }
  .summary { display: none; }
}