:root {
  --s3d-accent: #00a0e3;
  --s3d-border: #d8e0ee;
  --s3d-line: #d8e0ee;
  --s3d-text: #363a47;
  --s3d-muted: #949caa;
  --s3d-icon: #55606b;
  --s3d-bg: #ffffff;
  --s3d-panel: #f5f7f8;
  --s3d-hover: #f5f7f8;
  --s3d-active: #d8e0ee;
  --s3d-radius: 8px;
  --s3d-font: "Vela Sans", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--s3d-font);
  color: var(--s3d-text);
  background: #eceef1;
}

:is(.s3d-head, .s3d-tools, .s3d-menu, .s3d-mobile-extra, .s3d-parts, .s3d-downloads, .s3d-catalog) .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  color: var(--s3d-text);
  font: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}

:is(.s3d-head, .s3d-tools, .s3d-menu, .s3d-mobile-extra, .s3d-parts, .s3d-downloads, .s3d-catalog) .btn:focus-visible {
  outline: 2px solid var(--s3d-accent);
  outline-offset: 1px;
}

:is(.s3d-head, .s3d-tools, .s3d-menu, .s3d-mobile-extra, .s3d-parts, .s3d-downloads, .s3d-catalog) .btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

:is(.s3d-head, .s3d-tools, .s3d-menu, .s3d-mobile-extra, .s3d-parts, .s3d-downloads, .s3d-catalog) [hidden] {
  display: none !important;
}

.svg-icon {
  flex: none;
  width: 18px;
  height: 18px;
}
.svg-icon-dropdown { width: 10px; height: 10px; margin-left: auto; }
.svg-icon-item { width: 17px; height: 17px; }
.s3d-tool .svg-icon { width: 20px; height: 20px; }
.pe-none { pointer-events: none; }
.me-2 { margin-right: 8px; }

.s3d-head {
  background: var(--s3d-bg);
  border: 1px solid var(--s3d-border);
  border-bottom: none;
  border-radius: var(--s3d-radius) var(--s3d-radius) 0 0;
}

.s3d-toolbar { container-type: inline-size; }

.s3d-mobilebar { display: none; }

.s3d-tabs {
  display: flex;
  gap: 4px;
  padding: 0 12px;
  border-bottom: 1px solid var(--s3d-border);
}

:is(.s3d-head, .s3d-mobile-extra) .s3d-tab {
  padding: 9px 8px;
  font-size: 13px;
  color: var(--s3d-muted);
  border-radius: 0;
  border-bottom: 2px solid transparent;
}
:is(.s3d-head, .s3d-mobile-extra) .s3d-tab:hover { color: var(--s3d-text); }
:is(.s3d-head, .s3d-mobile-extra) .s3d-tab.active {
  color: var(--s3d-accent);
  border-bottom-color: var(--s3d-accent);
}

.s3d-pane { display: none; }
.s3d-pane.is-shown {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 14px;
  padding: 10px 12px;
}

.s3d-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--s3d-border);
}
.s3d-group:first-child { padding-left: 0; border-left: none; }

@container (max-width: 870px) {
  .s3d-pane.is-shown { gap: 12px 20px; }
  .s3d-group { padding-left: 0; border-left: none; }
}

.s3d-group__title {
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--s3d-muted);
}

.s3d-group__body {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 6px;
}

:is(.s3d-head, .s3d-tools) .s3d-tool {
  flex-direction: column;
  gap: 3px;
  min-width: 54px;
  padding: 5px 7px;
  line-height: 1.2;
}
:is(.s3d-head, .s3d-tools) .s3d-tool--inline { flex-direction: row; gap: 5px; min-width: 0; }
:is(.s3d-head, .s3d-tools) .s3d-tool--bare { min-width: 0; width: 32px; height: 32px; padding: 0; }

.s3d-tool__label {
  font-size: 11px;
  color: var(--s3d-text);
  white-space: nowrap;
}

:is(.s3d-head, .s3d-tools) .s3d-tool:hover:not(:disabled) { background: var(--s3d-hover); }
:is(.s3d-head, .s3d-tools) .s3d-tool.active {
  background: var(--s3d-active);
  border-color: var(--s3d-active);
}
.s3d-tool.active .s3d-tool__label { color: var(--s3d-accent); }

:is(.s3d-head, .s3d-downloads) .dropdown {
  position: relative;
  display: inline-block;
}
:is(.s3d-head, .s3d-downloads) .dropdown.is-disabled { opacity: .45; }

:is(.s3d-head, .s3d-downloads) .dropdown-toggle {
  gap: 8px;
  width: 100%;
  min-width: 140px;
  height: 34px;
  padding: 0 10px;
  font-size: 13px;
  text-align: left;
  background: var(--s3d-bg);
  border-color: var(--s3d-line);
}
:is(.s3d-head, .s3d-downloads) .dropdown-toggle:hover:not(:disabled) { border-color: #b9c1cb; }
:is(.s3d-head, .s3d-downloads) .dropdown.show .dropdown-toggle { border-color: var(--s3d-accent); }

.dropdown-toggle__label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
:is(.s3d-head, .s3d-downloads) .dropdown-toggle .svg-icon-dropdown { transition: transform .12s; }
:is(.s3d-head, .s3d-downloads) .dropdown.show .dropdown-toggle .svg-icon-dropdown { transform: rotate(180deg); }

:is(.s3d-head, .s3d-downloads) .dropdown-menu {
  position: absolute;
  z-index: 20;
  top: calc(100% + 4px);
  left: 0;
  display: none;
  min-width: 100%;
  padding: 4px;
  background: var(--s3d-bg);
  border: 1px solid var(--s3d-border);
  border-radius: var(--s3d-radius);
  box-shadow: 0 8px 24px rgba(24, 32, 44, .12);
}
:is(.s3d-head, .s3d-downloads) .dropdown-menu.show { display: block; }

:is(.s3d-head, .s3d-downloads) .dropdown-link {
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  font-size: 13px;
  white-space: nowrap;
  justify-content: flex-start;
}
:is(.s3d-head, .s3d-downloads) .dropdown-link:hover { background: var(--s3d-hover); }
:is(.s3d-head, .s3d-downloads) .dropdown-link.active {
  background: var(--s3d-active);
  font-weight: 600;
}

.s3d-slider { width: 140px; accent-color: var(--s3d-accent); }
.s3d-slider--wide { width: 100%; }
.s3d-slider:disabled { opacity: .45; cursor: not-allowed; }

.s3d-field {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 34px;
  padding: 0 8px;
  background: var(--s3d-bg);
  border: 1px solid var(--s3d-line);
  border-radius: 6px;
}
.s3d-field:focus-within { border-color: var(--s3d-accent); }
.s3d-field:has(.s3d-num:disabled) { opacity: .45; }
.s3d-num {
  width: 56px;
  padding: 0;
  border: none;
  outline: none;
  background: transparent;
  color: var(--s3d-text);
  font: inherit;
  font-size: 13px;
  text-align: right;
}
.s3d-field__unit { color: var(--s3d-muted); font-size: 12px; }

.s3d-tools {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 2px;
}
.s3d-tools--bar { position: static; margin-left: auto; }
.s3d-tools .s3d-tool:hover { background: rgba(255, 255, 255, .9); }
.s3d-tools .s3d-tool.active { background: rgba(0, 160, 227, .16); border-color: transparent; }

.s3d-mobilebar {
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
}

.s3d-head .s3d-mobilebar__menu {
  gap: 8px;
  height: 34px;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
  text-transform: uppercase;
}
.s3d-head .s3d-mobilebar__menu:hover { background: var(--s3d-hover); }
.s3d-head .s3d-mobilebar__menu[aria-expanded="true"] { color: var(--s3d-accent); }

.s3d-menu {
  position: absolute;
  z-index: 7;
  top: 0;
  left: 0;
  bottom: 0;
  display: none;
  flex-direction: column;
  width: 64%;
  min-width: 210px;
  max-width: 280px;
  overflow-y: auto;
  padding: 4px 0 12px;
  background: var(--s3d-bg);
  border-right: 1px solid var(--s3d-border);
  box-shadow: 4px 0 16px rgba(20, 30, 45, .1);
}

.s3d-menu__group { padding: 6px 0; }
.s3d-menu__title {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--s3d-text);
}

.s3d-menu__divider {
  height: 1px;
  margin: 5px 14px;
  background: var(--s3d-border);
}

.s3d-menu .s3d-menu__item {
  justify-content: flex-start;
  gap: 10px;
  width: 100%;
  padding: 9px 14px;
  font-size: 13px;
  border-radius: 0;
}
.s3d-menu .s3d-menu__item:hover { background: var(--s3d-hover); }
.s3d-menu .s3d-menu__item.active {
  background: var(--s3d-active);
  color: var(--s3d-accent);
  font-weight: 600;
}

.s3d-mobile-extra {
  display: none;
  background: var(--s3d-bg);
  border: 1px solid var(--s3d-border);
  border-top: none;
  border-radius: 0 0 var(--s3d-radius) var(--s3d-radius);
}
.s3d-mobile-extra[hidden] { display: none; }

.s3d-mobile-extra__pane { display: none; }
.s3d-mobile-extra__pane.is-shown {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
}

.s3d-mobile-extra .s3d-chip {
  padding: 6px 10px;
  font-size: 13px;
  color: var(--s3d-icon);
  border-color: var(--s3d-line);
}
.s3d-mobile-extra .s3d-chip:hover:not(:disabled) { background: var(--s3d-hover); }
.s3d-mobile-extra .s3d-chip.active {
  color: var(--s3d-accent);
  background: var(--s3d-active);
  border-color: var(--s3d-active);
}

.s3d-stage {
  container: s3d / inline-size;
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--s3d-border);
  border-top: none;
  border-radius: 0 0 var(--s3d-radius) var(--s3d-radius);
}
.s3d-stage .s3d-viewer { height: 460px; }

.s3d-stage:fullscreen { height: 100vh; background: #fff; }
.s3d-stage:fullscreen .s3d-viewer { height: auto; flex: 1 1 auto; }
.s3d-stage:fullscreen .s3d-head { border-radius: 0; }

@container s3d (max-width: 640px) {
  .s3d-toolbar { display: none; }
  .s3d-tools:not(.s3d-tools--bar) { display: none; }
  .s3d-mobilebar { display: flex; }
  .s3d-menu:not([hidden]) { display: flex; }
  .s3d-mobile-extra:not([hidden]) { display: block; }
  .s3d-stage { border-radius: 0; border-bottom: none; }
  .s3d-stage .s3d-viewer { height: 380px; }
  .s3d-parts { width: calc(100% - 24px); }
}

.s3d-parts {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 5;
  display: flex;
  flex-direction: column;
  width: 250px;
  max-height: calc(100% - 24px);
  background: rgba(255, 255, 255, .95);
  border: 1px solid var(--s3d-border);
  border-radius: var(--s3d-radius);
  box-shadow: 0 4px 16px rgba(20, 30, 45, .12);
  font-size: 13px;
}
.s3d-parts[hidden] { display: none; }

.s3d-parts__head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 8px 8px 12px;
  border-bottom: 1px solid var(--s3d-border);
}
.s3d-parts__title { font-weight: 700; }
.s3d-parts__count { color: var(--s3d-muted); font-size: 12px; margin-right: auto; }
.s3d-parts .s3d-parts__close {
  width: 22px; height: 22px;
  font-size: 17px; line-height: 1;
  color: var(--s3d-muted);
  border-radius: 4px;
}
.s3d-parts .s3d-parts__close:hover { background: var(--s3d-hover); color: var(--s3d-text); }

.s3d-parts__list { overflow-y: auto; padding: 4px; }
.s3d-parts__empty { padding: 10px 8px; color: var(--s3d-muted); }

.s3d-part {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 5px;
}
.s3d-part:hover { background: var(--s3d-hover); }
.s3d-part.is-hidden .s3d-part__name { color: var(--s3d-muted); text-decoration: line-through; }

.s3d-part__label {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
  flex: 1;
  cursor: pointer;
}
.s3d-part__label input { accent-color: var(--s3d-accent); flex: none; }
.s3d-part__name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.s3d-parts .s3d-part__only {
  flex: none;
  padding: 2px 7px;
  font-size: 11px;
  color: var(--s3d-accent);
  background: #fff;
  border-color: var(--s3d-border);
  border-radius: 4px;
  opacity: 0;
  transition: opacity .12s;
}
.s3d-part:hover .s3d-part__only { opacity: 1; }
.s3d-parts .s3d-part__only:hover { border-color: var(--s3d-accent); }

.s3d-parts__foot { padding: 8px; border-top: 1px solid var(--s3d-border); }
.s3d-parts .s3d-parts__all {
  width: 100%;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--s3d-accent);
  background: #fff;
  border-color: var(--s3d-accent);
}
.s3d-parts .s3d-parts__all:hover { background: #f0f5fd; }

.s3d-downloads {
  padding: 14px 16px;
  background: var(--s3d-panel);
  border: 1px solid var(--s3d-border);
  border-radius: var(--s3d-radius);
}
.s3d-downloads__title { font-weight: 700; margin-bottom: 10px; }
.s3d-downloads__empty { color: var(--s3d-muted); font-size: 14px; }
.s3d-downloads__list { display: flex; flex-direction: column; gap: 6px; }

.s3d-dl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 10px;
  background: #fff;
  border: 1px solid var(--s3d-border);
  border-radius: 6px;
}
.s3d-dl-row.is-locked { opacity: .65; }
.s3d-dl-row__meta { display: flex; flex-direction: column; }
.s3d-dl-row__fmt { font-weight: 600; font-size: 14px; }
.s3d-dl-row__size { font-size: 12px; color: var(--s3d-muted); }
.s3d-downloads .s3d-dl-row__btn {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--s3d-accent);
}
.s3d-downloads .s3d-dl-row__btn:disabled { background: #b7bec6; opacity: 1; }

.s3d-email {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--s3d-border);
}
.s3d-email .dropdown { flex: 1 1 110px; }
.s3d-email .dropdown-toggle { min-width: 0; height: 32px; }
.s3d-email__input {
  flex: 1 1 100%;
  order: -1;
  min-width: 0;
  height: 32px;
  padding: 0 10px;
  border: 1px solid var(--s3d-line);
  border-radius: 6px;
  font: inherit;
  font-size: 13px;
}
.s3d-downloads .s3d-email__btn {
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--s3d-accent);
  background: #fff;
  border-color: var(--s3d-accent);
}

.s3d-catalog__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.s3d-catalog__search {
  flex: 1 1 auto;
  min-width: 0;
  padding: 7px 10px;
  border: 1px solid var(--s3d-line);
  border-radius: var(--s3d-radius);
  background: var(--s3d-bg);
  color: var(--s3d-text);
  font: inherit;
  font-size: 13px;
}
.s3d-catalog__search:focus { outline: none; border-color: var(--s3d-accent); }
.s3d-catalog__count { color: var(--s3d-muted); font-size: 12px; white-space: nowrap; }

.s3d-catalog__list {
  max-height: 420px;
  overflow-y: auto;
  border: 1px solid var(--s3d-border);
  border-radius: 10px;
  background: var(--s3d-bg);
}
.s3d-catalog__group {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--s3d-panel);
  border-bottom: 1px solid var(--s3d-border);
  font-size: 12px;
  font-weight: 700;
  color: var(--s3d-muted);
}
.s3d-catalog .s3d-catalog__item {
  align-items: baseline;
  justify-content: flex-start;
  gap: 8px;
  width: 100%;
  padding: 7px 10px;
  border-radius: 0;
  font-size: 13px;
  text-align: left;
}
.s3d-catalog .s3d-catalog__item:hover { background: var(--s3d-hover); }
.s3d-catalog .s3d-catalog__item.is-active {
  background: var(--s3d-active);
  color: var(--s3d-accent);
  font-weight: 600;
}
.s3d-catalog__no { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.s3d-catalog__size { margin-left: auto; color: var(--s3d-muted); font-size: 12px; white-space: nowrap; }
.s3d-catalog__empty { padding: 12px 10px; color: var(--s3d-muted); font-size: 13px; }

.demo {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}
.demo h1 { font-size: 22px; margin: 0 0 4px; }
.demo__sub { color: var(--s3d-muted); margin: 0 0 20px; font-size: 14px; }
.demo__grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 20px;
  align-items: start;
}
.demo__aside { display: flex; flex-direction: column; gap: 20px; }
.demo__card h2 { font-size: 15px; margin: 0 0 10px; }
@media (max-width: 1000px) {
  .demo__grid { grid-template-columns: 1fr; }
}