:root {
  --bg: #f5f6f8; --panel: #fff; --text: #1d2330; --muted: #6b7280; --border: #e2e5ea;
  --accent: #00ae42; --accent-text: #fff; --input: #fff; --code-bg: #fbfbfc;
  color-scheme: light dark; /* native scrollbars and form controls follow the theme */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --panel: #1c1f25; --text: #e6e8ec; --muted: #9aa1ad; --border: #2c3038;
    --input: #23272e; --code-bg: #181b20;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* don't let display rules below un-hide elements */
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 14px/1.4 system-ui, sans-serif; display: flex; flex-direction: column; }

header { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--border); }
h1 { font-size: 17px; margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn { border: 1px solid var(--border); background: var(--input); color: var(--text); padding: 6px 12px;
  border-radius: 6px; cursor: pointer; font: inherit; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn:disabled { opacity: .5; cursor: default; }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; }

main { flex: 1; min-height: 0; display: grid; grid-template-columns: 300px 1fr 420px; gap: 1px; background: var(--border); }
main { grid-template-columns: 340px minmax(0, 1fr) 420px; overflow: hidden; }
main.code-hidden { grid-template-columns: 340px minmax(0, 1fr); }
main.code-hidden #codePane { display: none; }
.pane { background: var(--panel); min-height: 0; min-width: 0; display: flex; flex-direction: column; }
.pane-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px;
  border-bottom: 1px solid var(--border); font-weight: 600; }

#params { flex: 1; overflow: auto; padding: 8px 14px; }

/* Customize header: title with icon, Code toggle and reset */
.customize-head { padding: 10px 12px 10px 14px; }
.head-title { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; }
.head-actions { display: flex; gap: 8px; }
.chip { display: grid; place-items: center; height: 32px; padding: 0 12px; font: 600 14px system-ui, sans-serif;
  color: var(--text); background: var(--input); border: 1px solid var(--border); border-radius: 6px; cursor: pointer; }
.chip.icon { width: 32px; padding: 0; }
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { color: var(--accent-text); background: var(--accent); border-color: var(--accent); }

/* Model card at the top of the sidebar */
.card { margin: 12px; padding: 0 14px; background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; }
.card > summary { display: flex; align-items: center; gap: 10px; padding: 12px 0; font-size: 16px; font-weight: 700;
  cursor: pointer; list-style: none; user-select: none; }
.card > summary::-webkit-details-marker { display: none; }
.card > summary::after { content: ""; margin-left: auto; width: 7px; height: 7px; border: solid var(--muted);
  border-width: 0 2px 2px 0; transform: translateY(-2px) rotate(45deg); transition: transform .15s; }
.card[open] > summary { border-bottom: 1px solid var(--border); }
.card[open] > summary::after { transform: translateY(2px) rotate(-135deg); }
.model-title { padding: 12px 0 10px; font-size: 15px; font-weight: 700; overflow-wrap: anywhere; }
.model-picker { display: flex; align-items: center; margin: 4px 0 14px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--input); overflow: hidden; }
.model-picker span { padding: 9px 12px; font-size: 13px; font-weight: 600; white-space: nowrap; border-right: 1px solid var(--border); }
.model-picker select { flex: 1; min-width: 0; padding: 9px 10px; font: 600 13px system-ui, sans-serif; color: var(--text);
  background: transparent; border: 0; outline: none; cursor: pointer; }
.model-picker select option { background: var(--panel); }

/* Collapsible parameter sections */
.section { border-bottom: 1px solid var(--border); }
.section summary { display: flex; align-items: center; justify-content: space-between; padding: 14px 0;
  font-weight: 700; cursor: pointer; list-style: none; user-select: none; }
.section summary::-webkit-details-marker { display: none; }
.section summary::after { content: ""; width: 7px; height: 7px; margin-right: 4px; flex: none;
  border: solid var(--muted); border-width: 2px 2px 0 0; transform: translateY(-2px) rotate(-45deg); transition: transform .15s; }
.section:not([open]) summary::after { transform: translateY(-4px) rotate(135deg); }
.section summary:hover::after { border-color: var(--text); }
.section[open] { padding-bottom: 8px; }
.param { padding: 10px 0; }
.param .head { display: flex; flex-wrap: wrap; align-items: baseline; column-gap: 8px; margin-bottom: 8px; }
.param label.name { font-weight: 600; }
.param .desc { color: var(--muted); font-size: 12px; }
.param.inline { display: flex; align-items: center; gap: 12px; }
.param.inline .head { flex: 1; margin-bottom: 0; }

.stepper { flex: 1; display: flex; align-items: center; gap: 6px; min-width: 0; padding: 4px 6px 4px 12px;
  background: var(--input); border: 1px solid var(--border); border-radius: 6px; }
.stepper:focus-within { border-color: var(--accent); }
.stepper.compact { flex: none; width: 130px; }
.param .stepper input[type=number] { flex: 1; min-width: 0; width: auto; border: 0; padding: 4px 0; background: transparent;
  font-weight: 600; outline: none; -moz-appearance: textfield; }
.stepper input::-webkit-outer-spin-button, .stepper input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.stepper button { flex: none; width: 22px; height: 22px; padding: 0; display: grid; place-items: center; cursor: pointer;
  font: 600 15px/1 system-ui, sans-serif; color: var(--text); background: transparent;
  border: 1.5px solid var(--muted); border-radius: 5px; }
.stepper button:hover { border-color: var(--accent); color: var(--accent); }
.param .row { display: flex; gap: 8px; align-items: center; }
.param input[type=range] { flex: 1; accent-color: var(--accent); }
.param input[type=number], .param input[type=text], .param select {
  background: var(--input); color: var(--text); border: 1px solid var(--border); border-radius: 5px; padding: 4px 6px; font: inherit; }
.param input[type=number] { width: 80px; }
.param input[type=text], .param select { width: 100%; }
.param .vec input { width: 100%; min-width: 0; }
.param .color-row input[type=color] { flex: none; width: 44px; height: 36px; padding: 3px; cursor: pointer;
  background: var(--input); border: 1px solid var(--border); border-radius: 6px; }
.param .color-row input[type=text] { flex: 1; min-width: 0; height: 36px; font-family: ui-monospace, monospace; }
/* Checkboxes drawn as toggle switches */
input[type=checkbox] { appearance: none; -webkit-appearance: none; margin: 0; flex: none; cursor: pointer;
  position: relative; width: 36px; height: 20px; border-radius: 10px; vertical-align: middle;
  background: var(--border); border: 1px solid var(--border); transition: background .15s, border-color .15s; }
input[type=checkbox]::before { content: ""; position: absolute; top: 2px; left: 2px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--muted); transition: transform .15s, background .15s; }
input[type=checkbox]:checked { background: var(--accent); border-color: var(--accent); }
input[type=checkbox]:checked::before { transform: translateX(16px); background: #fff; }
input[type=checkbox]:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.auto { display: flex; align-items: center; gap: 8px; }
.muted { color: var(--muted); }
.side-foot { padding: 10px 14px 14px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.auto { color: var(--muted); }
.foot-actions { display: flex; gap: 8px; }
.chip.icon.big { width: 44px; height: 44px; }
.generate { flex: 1; height: 44px; font: 700 16px system-ui, sans-serif; color: var(--accent-text); background: var(--accent);
  border: 0; border-radius: 6px; cursor: pointer; }
.generate:hover { filter: brightness(1.1); }

#viewPane { position: relative; }

/* Bed toolbar at the bottom of the 3D view: plate / grid and the printer menu */
.bed-tools { position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 8px; }
.bed-bar { display: flex; align-items: center; gap: 6px; padding: 5px; background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 4px 16px rgba(0, 0, 0, .25); }
.bed-btn { display: grid; place-items: center; width: 38px; height: 34px; color: var(--muted); background: none;
  border: 0; border-radius: 6px; cursor: pointer; }
.bed-btn:hover { color: var(--text); }
.bed-btn.active { color: var(--text); background: var(--input); }
.bed-btn.arrow { width: 24px; background: var(--input); }
.bed-btn.arrow svg { transition: transform .15s; }
.bed-btn.arrow[aria-expanded="true"] svg { transform: rotate(180deg); }
.bed-sep { width: 1px; height: 18px; background: var(--border); }
.printer-menu { min-width: 240px; max-height: 60vh; overflow: auto; padding: 6px; background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 8px 24px rgba(0, 0, 0, .35); }
.printer-menu button { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 9px 14px;
  font: 14px system-ui, sans-serif; color: var(--text); text-align: left; background: none; border: 0; border-radius: 5px; cursor: pointer; }
.printer-menu button:hover { background: var(--input); }
.printer-menu button[aria-checked="true"] { background: var(--input); }
.printer-menu button[aria-checked="true"]::after { content: "✓"; color: var(--accent); font-weight: 700; }

/* Floating Assemble View / Plates switch over the 3D view */
.plate-bar { position: absolute; top: 14px; left: 50%; transform: translateX(-50%); z-index: 2;
  display: flex; flex-direction: column; align-items: stretch; gap: 8px; min-width: 320px; }
.seg { display: flex; padding: 5px; gap: 4px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 4px 16px rgba(0, 0, 0, .25); }
.seg-btn { flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 18px; white-space: nowrap;
  font: 600 15px system-ui, sans-serif; color: var(--muted); background: none; border: 0; border-radius: 7px; cursor: pointer; }
.seg-btn + .seg-btn:not(.active) { box-shadow: -1px 0 0 var(--border); }
.seg-btn:hover { color: var(--text); }
.seg-btn.active { color: var(--text); background: var(--input); }
.seg-btn svg { transition: transform .15s; }
.seg-btn[aria-expanded="false"] svg { transform: rotate(180deg); }
.plate-menu { display: flex; flex-direction: column; gap: 6px; padding: 6px; max-height: 50vh; overflow: auto;
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 24px rgba(0, 0, 0, .3); }
.plate-item { display: flex; align-items: center; gap: 14px; padding: 6px; font: 600 15px system-ui, sans-serif;
  color: var(--text); text-align: left; background: var(--code-bg); border: 1px solid transparent; border-radius: 8px; cursor: pointer; }
.plate-item:hover { border-color: var(--border); }
.plate-item.active { border-color: var(--accent); }
.plate-thumb { flex: none; width: 56px; height: 56px; border-radius: 6px; background: var(--input) center / cover no-repeat; }
.plate-thumb:not([style]) { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239aa1ad' stroke-width='1.5' stroke-linejoin='round'%3E%3Cpath d='M12 2l9 5v10l-9 5-9-5V7z'/%3E%3Cpath d='M3 7l9 5 9-5M12 12v10'/%3E%3C/svg%3E");
  background-size: 28px; opacity: .6; }
#viewer { flex: 1; min-height: 0; }
#status { position: absolute; left: 12px; bottom: 12px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 10px; font-size: 12px; color: var(--muted); }
#status.err { color: #e5484d; }

.editor { flex: 1; min-height: 0; display: flex; overflow: auto; background: var(--code-bg); }
#gutter, #code { font: 13px/1.5 ui-monospace, "JetBrains Mono", Menlo, monospace; margin: 0; padding: 10px 8px; }
#gutter { color: var(--muted); text-align: right; user-select: none; min-width: 42px; border-right: 1px solid var(--border); height: max-content; }
#code { flex: 1; border: 0; outline: 0; resize: none; background: transparent; color: var(--text); tab-size: 4;
  white-space: pre; overflow: hidden; min-height: 100%; }
#hiddenNote { padding: 6px 12px; font-size: 12px; border-top: 1px solid var(--border); }
#hiddenNote:empty { display: none; }
#log { max-height: 30%; overflow: auto; margin: 0; padding: 8px 12px; font: 12px/1.4 ui-monospace, monospace;
  border-top: 1px solid var(--border); white-space: pre-wrap; background: var(--code-bg); }

/* Download dialog */
#downloadDialog { width: min(880px, calc(100vw - 32px)); padding: 0; color: var(--text); background: var(--panel);
  border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 20px 60px rgba(0, 0, 0, .45); }
#downloadDialog::backdrop { background: rgba(0, 0, 0, .55); }
.dlg-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px 16px 24px;
  border-bottom: 1px solid var(--border); }
.dlg-head h2 { margin: 0; font-size: 18px; }
.dlg-body { padding: 20px 24px; border-bottom: 1px solid var(--border); }
.dlg-body p { margin: 0 0 16px; color: var(--muted); line-height: 1.6; }
.credit { display: flex; align-items: center; gap: 12px; padding: 12px 12px 12px 16px; background: var(--code-bg);
  border: 1px solid var(--border); border-radius: 6px; }
.credit span { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.credit .icon-btn { border-left: 1px solid var(--border); border-radius: 0; padding-left: 12px; }
.icon-btn { flex: none; display: grid; place-items: center; padding: 4px; color: var(--muted); background: none;
  border: 0; border-radius: 4px; cursor: pointer; }
.icon-btn:hover { color: var(--text); }
.icon-btn.copied { color: var(--accent); }
.dlg-foot { padding: 16px 24px 20px; }
.split { position: relative; display: flex; border-radius: 6px; background: var(--accent); }
.split button { color: var(--accent-text); background: none; border: 0; cursor: pointer; font: 600 18px/1 system-ui, sans-serif; }
.split-main { flex: 1; padding: 14px; }
.split-arrow { display: grid; place-items: center; padding: 0 14px; border-left: 2px solid rgba(255, 255, 255, .7) !important; }
.split button:hover { background: rgba(255, 255, 255, .1); }
.split-menu { position: absolute; right: 0; bottom: calc(100% + 6px); min-width: 260px; padding: 6px; background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 10px 30px rgba(0, 0, 0, .35); }
.split .split-menu button { display: block; width: 100%; text-align: left; padding: 8px 10px 8px 30px; position: relative;
  color: var(--text); font: 600 14px/1.3 system-ui, sans-serif; border-radius: 5px; }
.split .split-menu button:hover { background: var(--input); }
.split-menu button span { display: block; font-weight: 400; font-size: 12px; color: var(--muted); }
.split-menu button[aria-checked="true"]::before { content: "✓"; position: absolute; left: 10px; color: var(--accent); }

@media (max-width: 1000px) {
  main, main.code-hidden { grid-template-columns: 1fr; grid-template-rows: 50vh auto 60vh; overflow: auto; }
  main.code-hidden { grid-template-rows: 50vh auto; }
  #viewPane { order: -1; }
}