/* ==========================================================================
   uiik demo design system
   Shared styles for test/index.html, test/index-dom.html, test/index-svg.html
   ========================================================================== */

:root {
  color-scheme: dark;

  --bg: #070a11;
  --bg-grid: rgba(56, 189, 248, 0.05);
  --surface: #0d1421;
  --surface-2: #111b2c;
  --surface-3: #16233a;
  --line: #1d2a40;
  --line-soft: #16212f;
  --text: #e7eefb;
  --text-dim: #a9bbd6;
  --muted: #7c90ae;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --accent-soft: rgba(56, 189, 248, 0.14);
  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #fb7185;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 24px 60px -32px rgba(2, 6, 23, 0.95);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Consolas,
    "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="light"] {
  color-scheme: light;

  --bg: #f2f5fa;
  --bg-grid: rgba(2, 132, 199, 0.06);
  --surface: #ffffff;
  --surface-2: #f7f9fd;
  --surface-3: #eef2f9;
  --line: #d9e1ee;
  --line-soft: #e6ecf5;
  --text: #101828;
  --text-dim: #334a68;
  --muted: #64748b;
  --accent: #0284c7;
  --accent-2: #4f46e5;
  --accent-soft: rgba(2, 132, 199, 0.1);
  --shadow: 0 20px 45px -30px rgba(15, 23, 42, 0.45);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background-color: var(--bg);
  background-image: linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 650;
  letter-spacing: -0.01em;
}

a {
  color: inherit;
  text-decoration: none;
}

code,
kbd {
  font-family: var(--mono);
}

::selection {
  background: var(--accent-soft);
}

/* ------------------------------- top bar -------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: 1560px;
  height: 62px;
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 800;
  color: #04121f;
  background: linear-gradient(140deg, #66e3ff, #43b4ff 55%, #818cf8);
  box-shadow: 0 6px 18px -8px rgba(56, 189, 248, 0.9);
}

.brand__ver {
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.topnav {
  display: flex;
  gap: 4px;
  margin-left: 6px;
}

.topnav a {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
}

.topnav a:hover {
  background: var(--surface-2);
  color: var(--text);
}

.topnav a[aria-current="page"] {
  color: var(--text);
  background: var(--accent-soft);
}

.topbar__spacer {
  flex: 1;
}

/* ------------------------------ controls -------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--text-dim);
  background: var(--surface-2);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s, transform 0.1s;
}

.btn:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--surface-3);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  color: #04121f;
  border-color: transparent;
  font-weight: 600;
  background: linear-gradient(140deg, #7dd3fc, #38bdf8);
}

.btn--primary:hover {
  color: #04121f;
  background: linear-gradient(140deg, #93c5fd, #22d3ee);
}

.btn--ghost {
  background: transparent;
}

.btn--sm {
  height: 26px;
  padding: 0 9px;
  font-size: 11.5px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

select,
input[type="range"] {
  accent-color: var(--accent);
}

select {
  height: 28px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--text);
  background: var(--surface-2);
}

.field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}

.field input[type="range"] {
  width: 110px;
}

.field b {
  min-width: 42px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-dim);
  text-align: right;
}

/* -------------------------------- layout -------------------------------- */

.layout {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  gap: 30px;
  max-width: 1560px;
  margin: 0 auto;
  padding: 26px 24px 96px;
}

/* 没有侧栏的页面（如 API 查询）走整幅单栏，
   否则 main 会落进那 268px 的侧栏轨道里，右侧整片空着。 */
.layout--wide {
  grid-template-columns: minmax(0, 1fr);
}

.sidenav {
  position: sticky;
  top: 84px;
  align-self: start;
  max-height: calc(100vh - 108px);
  padding-right: 6px;
  overflow: auto;
  /* 滚到头之后不要把滚动传给整页：
     没有这条时，左栏到底后继续滚会连带滚动右侧页面，
     而左栏的 scrollTop 还会被弹回顶部，看起来像「高度塌成 0」。 */
  overscroll-behavior: contain;
}

.sidenav__title {
  padding: 0 10px 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.sidenav__group {
  margin-bottom: 16px;
}

.sidenav__label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.sidenav__label::after {
  flex: 1;
  height: 1px;
  content: "";
  background: var(--line-soft);
}

.sidenav a {
  display: block;
  padding: 5px 10px 5px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: var(--muted);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.sidenav a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.sidenav a.is-active {
  color: var(--text);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.main {
  min-width: 0;
}

.page-head {
  margin-bottom: 26px;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  box-shadow: var(--shadow);
}

.page-head h1 {
  font-size: 27px;
}

.page-head p {
  max-width: 76ch;
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--text-dim);
}

.page-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

/* --------------------------------- card --------------------------------- */

.card {
  margin-bottom: 22px;
  scroll-margin-top: 84px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card__head {
  padding: 18px 20px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--surface-2), transparent);
}

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

.card__title {
  font-size: 16.5px;
}

.card__desc {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--text-dim);
}

.sig {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 11.5px;
  color: var(--accent);
  background: var(--accent-soft);
  white-space: nowrap;
}

.tag {
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  white-space: nowrap;
}

.tag--html {
  color: #7dd3fc;
  border-color: rgba(125, 211, 252, 0.35);
  background: rgba(125, 211, 252, 0.1);
}

.tag--svg {
  color: #c4b5fd;
  border-color: rgba(196, 181, 253, 0.35);
  background: rgba(196, 181, 253, 0.1);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.chip {
  padding: 2px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: var(--surface-2);
}

.chip b {
  color: var(--accent);
  font-weight: 500;
}

.card__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
}

.card__stage {
  min-width: 0;
  padding: 18px 20px 20px;
}

.card__aside {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 16px 20px;
  border-left: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--surface-2) 60%, transparent);
}

.aside__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.aside__block {
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.aside__block>h4 {
  margin-bottom: 8px;
  font-size: 11.5px;
  color: var(--text-dim);
}

.readout {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-word;
}

.readout b {
  color: var(--accent);
  font-weight: 500;
}

/* -------------------------------- code ---------------------------------- */

.code {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}

.code__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.code__head h4 {
  font-size: 11.5px;
  color: var(--text-dim);
}

.code__head .btn.is-ok {
  color: var(--ok);
  border-color: var(--ok);
}

.code__pre {
  margin: 0;
  max-height: 260px;
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.65;
  color: var(--text-dim);
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}

.code__pre::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.code__pre::-webkit-scrollbar-thumb {
  border-radius: 4px;
  background: var(--line);
}

/* noAside 的示例把代码面板直接挂在 stage 内（下方通栏） */
.stage>.aside__block {
  margin: 14px;
}

/* -------------------------------- stage --------------------------------- */

.stage {
  position: relative;
  min-height: 220px;
  border: 1px dashed var(--line);
  border-radius: 12px;
  background:
    linear-gradient(var(--surface-2), var(--surface-2)) padding-box,
    repeating-linear-gradient(45deg,
      transparent 0 10px,
      rgba(125, 211, 252, 0.025) 10px 20px);
  overflow: hidden;
}

.stage--tall {
  min-height: 320px;
}

.stage--short {
  min-height: 140px;
}

.stage--scroll {
  overflow: auto;
}

.stage--grid-bg {
  background-image: linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 24px 24px;
}

.stage__hint {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 12.5px;
  color: var(--muted);
  pointer-events: none;
}

.stage__hint--tl {
  inset: 8px auto auto 10px;
  display: block;
  font-family: var(--mono);
  font-size: 11px;
}

/* --------------------------- demo primitives ---------------------------- */

.tile {
  position: absolute;
  display: grid;
  place-items: center;
  width: 104px;
  height: 76px;
  border-radius: 12px;
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  color: #f8fbff;
  cursor: move;
  user-select: none;
  touch-action: none;
  background: linear-gradient(155deg, #2563eb, #0ea5e9);
  box-shadow: 0 12px 28px -16px rgba(14, 165, 233, 0.9);
}

.tile--violet {
  background: linear-gradient(155deg, #7c3aed, #6366f1);
  box-shadow: 0 12px 28px -16px rgba(129, 140, 248, 0.9);
}

.tile--emerald {
  background: linear-gradient(155deg, #059669, #10b981);
  box-shadow: 0 12px 28px -16px rgba(16, 185, 129, 0.9);
}

.tile--amber {
  background: linear-gradient(155deg, #d97706, #f59e0b);
  box-shadow: 0 12px 28px -16px rgba(245, 158, 11, 0.9);
}

.tile--rose {
  background: linear-gradient(155deg, #e11d48, #f43f5e);
  box-shadow: 0 12px 28px -16px rgba(244, 63, 94, 0.9);
}

.tile--outline {
  color: var(--text-dim);
  background: var(--surface-3);
  border: 1px dashed var(--line);
  box-shadow: none;
}

.tile__bar {
  position: absolute;
  inset: 0 0 auto;
  height: 20px;
  border-radius: 12px 12px 0 0;
  background: rgba(255, 255, 255, 0.16);
  cursor: move;
}

.tile__actions {
  position: absolute;
  top: 28px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 22px;
  border-radius: 6px;
  font-size: 11px;
  color: #04263c;
  background: rgba(255, 255, 255, 0.85);
  cursor: not-allowed;
}

.uii-draggable-active:not(.uii-draggable-ghost) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.uii-draggable-ghost {
  border: 2px dashed var(--accent) !important;
  opacity: 0.95 !important;
  box-shadow: 0 18px 40px -20px rgba(56, 189, 248, 0.8) !important;
}

.tile--dragging {
  outline: 2px solid var(--warn);
}

.ghost-plain {
  border: 2px dashed var(--warn) !important;
  background: rgba(251, 191, 36, 0.12) !important;
  box-shadow: none !important;
  opacity: 1 !important;
}

.ghost-outline {
  border: 2px dashed var(--accent-2) !important;
  box-shadow: none !important;
}

.ghost-resize {
  border: 2px dashed var(--ok) !important;
  background: rgba(52, 211, 153, 0.1) !important;
  box-shadow: none !important;
}

.ghost-split {
  background: var(--ok) !important;
  border-radius: 3px;
  box-shadow: 0 0 0 1px var(--ok), 0 0 12px rgba(52, 211, 153, 0.55);
}

.snappable {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px dashed var(--line);
  border-radius: 10px;
  font-size: 10.5px;
  color: var(--muted);
  background: rgba(125, 211, 252, 0.04);
  pointer-events: none;
}

.guide {
  position: absolute;
  z-index: 20;
  pointer-events: none;
}

.guide--h {
  height: 0;
  border-top: 1px dashed var(--accent);
}

.guide--v {
  width: 0;
  border-left: 1px dashed var(--accent);
}

.guide[hidden] {
  display: none;
}

.dropzone {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px dashed var(--line);
  border-radius: 12px;
  font-size: 11.5px;
  color: var(--muted);
  background: rgba(129, 140, 248, 0.05);
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.dropzone.is-active {
  border-color: var(--accent-2);
  color: var(--text-dim);
  background: rgba(129, 140, 248, 0.12);
}

.dropzone.is-hover {
  border-style: solid;
  border-color: var(--accent);
  color: var(--text);
  background: rgba(56, 189, 248, 0.16);
}

.dropzone.is-dropped {
  border-color: var(--ok);
  background: rgba(52, 211, 153, 0.16);
}

/* ------------------------------ resizable ------------------------------- */

.panel-box {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 11.5px;
  color: var(--text-dim);
  background: linear-gradient(150deg, var(--surface-3), var(--surface-2));
}

.uii-resizable-handle {
  position: absolute;
  z-index: 5;
  width: 10px;
  height: 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 60%, transparent);
  border-radius: 3px;
  background: color-mix(in srgb, var(--accent) 55%, #0b1220);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}

.uii-resizable-handle-active {
  background: var(--warn);
}

.uii-resizable-ghost {
  border: 2px dashed var(--ok) !important;
  background: rgba(52, 211, 153, 0.12) !important;
}

.rot-box {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 11.5px;
  color: var(--text-dim);
  background: linear-gradient(150deg, #1e3a8a55, #0ea5e933);
}

.rot-box__center {
  position: absolute;
  width: 9px;
  height: 9px;
  border: 1px solid var(--warn);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.rot-box__center::after {
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  content: "";
  background: var(--warn);
}

.rot-handle {
  position: absolute;
  z-index: 5;
  width: 12px;
  height: 12px;
  border: 2px solid #0b1220;
  border-radius: 50%;
  background: var(--warn);
  box-shadow: 0 0 0 1px var(--warn);
  cursor: crosshair;
}

.uii-rotatable-active {
  filter: drop-shadow(0 0 10px rgba(251, 191, 36, 0.55));
}

/* ------------------------------ splittable ------------------------------ */

/* newSplittable 自动创建的手柄只带 inline style（position/size），
   若不给背景就完全透明，用户看不到抓手位置。
   放在 .split-handle 之前：自定义手柄靠等特异性 + 后置规则覆盖这里的样式。
   只设 background，不设 opacity——自定义手柄各自有 opacity，
   在这里设基础值会把它们一并改掉（如 .split-embedded）。 */
.uii-splittable-handle {
  background: linear-gradient(90deg,
      transparent,
      var(--accent) 30%,
      var(--accent) 70%,
      transparent);
}

.uii-splittable-v>.uii-splittable-handle {
  background: linear-gradient(180deg,
      transparent,
      var(--accent) 30%,
      var(--accent) 70%,
      transparent);
}

.uii-splittable-handle:hover,
.uii-splittable-handle-active {
  opacity: 1;
}

/* ghost 模式下拖动的是手柄副本，克隆体继承了 height:100%，
   因此 ghostTo 容器必须有确定高度，否则副本会算成 0 高而看不见。 */
.uii-splittable-handle-ghost {
  background: var(--ok) !important;
  border-radius: 3px;
  opacity: 0.9 !important;
  box-shadow: 0 0 0 1px var(--ok), 0 0 12px rgba(52, 211, 153, 0.55);
}

.split {
  position: relative;
  display: flex;
  height: 108px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.split--v {
  flex-direction: column;
  height: 240px;
  width: 220px;
}

.split--3>.split-pane {
  width: 33.3333%;
}

.split-pane {
  display: grid;
  place-items: center;
  /* 面板由 splittable 通过 width/height !important 控制，
     因此这里不能用 flex-basis / flex-grow，改用 width 预留初始比例。
     注意：newSplittable 自动创建的手柄是 position:absolute（不占布局空间），
     所以面板宽度不能再为它扣减 handleSize/2，否则末尾会留下一段空白。
     自定义手柄（.split-handle）在流内占位，需由 .split--grip 单独扣减。 */
  flex: 0 0 auto;
  width: 50%;
  min-width: 24px;
  min-height: 24px;
  font-size: 11.5px;
  color: var(--text-dim);
  background: var(--surface-2);
  transition: background 0.15s;
}

/* 自定义手柄参与 flex 流，需为其预留宽度 */
.split--grip>.split-pane {
  width: calc(50% - 5px);
}

.split--v>.split-pane {
  width: 100%;
  height: 50%;
}

.split-pane--a {
  background: linear-gradient(150deg, #1d4ed833, var(--surface-2));
}

.split-pane--b {
  background: linear-gradient(150deg, #0f766e33, var(--surface-2));
}

.split-pane--c {
  background: linear-gradient(150deg, #7c3aed33, var(--surface-2));
}

.split-pane--d {
  background: linear-gradient(150deg, #b4530933, var(--surface-2));
}

.split-pane:hover {
  background: var(--surface-3);
}

.split-handle {
  flex: 0 0 auto;
  align-self: stretch;
  width: 10px;
  cursor: e-resize;
  background: linear-gradient(180deg,
      transparent,
      var(--accent) 30%,
      var(--accent) 70%,
      transparent);
  opacity: 0.5;
  transition: opacity 0.15s;
}

.split-handle:hover,
.split-handle.uii-splittable-handle-active {
  opacity: 1;
}

.split--v>.split-handle {
  width: auto;
  height: 10px;
  align-self: auto;
  cursor: s-resize;
  background: linear-gradient(90deg,
      transparent,
      var(--accent) 30%,
      var(--accent) 70%,
      transparent);
}

.split-embedded {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  cursor: e-resize;
  background: rgba(56, 189, 248, 0.22);
}

/* ------------------------------ selectable ------------------------------ */

.sel-stage {
  position: relative;
  height: 300px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-2);
  cursor: crosshair;
}

.uii-selector {
  position: absolute;
  z-index: 30;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  pointer-events: none;
}

/* 选择框注入 SVG 容器时是一个 <rect>：border / background 对 SVG 无效，
   不显式给 fill 的话 SVG 默认填充是纯黑 */
svg .uii-selector {
  fill: var(--accent-soft);
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 5 3;
}

.sel-box {
  position: absolute;
  display: grid;
  place-items: center;
  width: 96px;
  height: 72px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-dim);
  background: var(--surface-3);
}

.uii-selecting {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}

/* 碰撞检测高亮：相交 / 被完全包含 */
.cd-target {
  transition: border-color 0.12s, background 0.12s, box-shadow 0.12s;
}

.cd-target--overlap {
  border-color: var(--warn);
  background: rgba(251, 191, 36, 0.18);
  box-shadow: 0 0 0 1px var(--warn) inset;
}

.cd-target--included {
  border-color: var(--ok);
  background: rgba(52, 211, 153, 0.18);
  box-shadow: 0 0 0 1px var(--ok) inset;
}

.uii-selected {
  border-color: var(--ok);
  color: var(--text);
  background: rgba(52, 211, 153, 0.14);
}

/* ------------------------------- sortable ------------------------------- */

.sort {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 190px;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  list-style: none;
  background: var(--surface-2);
}

.sort--col {
  flex-direction: column;
  flex-wrap: nowrap;
  width: 232px;
  min-height: 200px;
}

.sort--row {
  min-height: 78px;
}

.sort__item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: 12.5px;
  color: var(--text-dim);
  background: var(--surface-3);
  cursor: grab;
  user-select: none;
}

.sort__item::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  content: "";
  background: var(--accent);
  opacity: 0.7;
}

.sort__item.is-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.sort__item--ghosted {
  border-style: dashed;
  border-color: var(--accent-2);
  background: rgba(129, 140, 248, 0.16);
  color: var(--text);
}

.uii-sortable-active {
  opacity: 0.32;
}

.uii-sortable-ghost {
  border-color: var(--accent) !important;
  background: rgba(56, 189, 248, 0.18) !important;
  color: var(--text) !important;
  box-shadow: 0 16px 32px -20px rgba(56, 189, 248, 0.9);
}

.sort.is-active {
  border-color: var(--accent-2);
  background: rgba(129, 140, 248, 0.08);
}

/* ------------------------------ geometry -------------------------------- */

.geo {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
}

.geo__canvas {
  min-width: 0;
  border-right: 1px solid var(--line-soft);
}

.geo__panel {
  padding: 16px;
  background: color-mix(in srgb, var(--surface-2) 60%, transparent);
}

.geo-svg {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
  user-select: none;
}

.geo-rect {
  fill: rgba(129, 140, 248, 0.28);
  stroke: var(--accent-2);
  stroke-width: 1;
}

.geo-rect--target {
  fill: rgba(56, 189, 248, 0.12);
  stroke: var(--accent);
  stroke-dasharray: 4 3;
}

.geo-rect--active {
  fill: rgba(251, 191, 36, 0.28);
  stroke: var(--warn);
}

.geo-rect--faded {
  fill: rgba(148, 163, 184, 0.14);
  stroke: var(--line);
  stroke-dasharray: 3 3;
}

.geo-label {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--muted);
}

.geo-guide {
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 4 3;
}

/* geometry 演示也可以纯 HTML：几何函数只吃 Rect，与渲染技术无关 */
.geo-world {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
}

.geo-box {
  border-style: dashed;
  border-color: var(--accent-2);
  background: rgba(129, 140, 248, 0.14);
}

.geo-box--target {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
}

.ga-union {
  position: absolute;
  border: 1px dashed var(--line);
  border-radius: 4px;
  pointer-events: none;
}

/* 视口边界：始终固定在舞台上，用来对照内容被缩放/平移后的位置 */
.geo-viewport {
  position: absolute;
  inset: 0;
  border: 1px dashed var(--warn);
  opacity: 0.55;
  pointer-events: none;
}

/* --------------------------------- svg ---------------------------------- */

.svg-frame {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  overflow: hidden;
}

.svg-canvas {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
}

.svg-shape {
  fill: rgba(56, 189, 248, 0.22);
  stroke: var(--accent);
  stroke-width: 1.5;
}

.svg-shape--violet {
  fill: rgba(129, 140, 248, 0.22);
  stroke: var(--accent-2);
}

.svg-shape--emerald {
  fill: rgba(52, 211, 153, 0.2);
  stroke: var(--ok);
}

.svg-shape--amber {
  fill: rgba(251, 191, 36, 0.2);
  stroke: var(--warn);
}

.svg-shape--rose {
  fill: rgba(244, 63, 94, 0.2);
  stroke: var(--danger);
}

.svg-label {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--text-dim);
  pointer-events: none;
}

.svg-grid-line {
  stroke: var(--line-soft);
  stroke-width: 1;
}

/* 装饰性网格不参与命中：否则大片空白处会被网格线挡住，
   导致 pointerdown 落在 <line> 而不是 <svg> 根上 */
.svg-grid {
  pointer-events: none;
}

.svg-axis {
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 2 4;
}

.svg-handle {
  fill: rgba(251, 191, 36, 0.9);
  stroke: #0b1220;
  stroke-width: 1;
}

svg .uii-resizable-handle {
  stroke: #0b1220;
  stroke-width: 1;
}

svg .uii-resizable-handle-active {
  fill: var(--warn);
}

svg .uii-resizable-ghost {
  fill: rgba(52, 211, 153, 0.18);
  stroke: var(--ok);
  stroke-dasharray: 5 3;
  stroke-width: 1.5;
}

svg .uii-draggable-active {
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.8));
}

svg .uii-selecting {
  fill: rgba(56, 189, 248, 0.34);
  stroke: var(--accent);
  stroke-width: 2;
}

svg .uii-selected {
  fill: rgba(52, 211, 153, 0.3);
  stroke: var(--ok);
  stroke-width: 2;
}

.svg-rot-handle {
  fill: var(--warn);
  stroke: #0b1220;
  stroke-width: 1;
  cursor: crosshair;
}

.svg-origin {
  fill: none;
  stroke: var(--danger);
  stroke-width: 1.5;
}

/* ------------------------------- landing -------------------------------- */

.hero {
  max-width: 1560px;
  margin: 0 auto;
  padding: 64px 24px 8px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-dim);
  background: var(--surface);
}

.hero h1 {
  max-width: 22ch;
  margin: 18px 0 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, #7dd3fc, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  max-width: 68ch;
  margin: 18px 0 0;
  font-size: 15px;
  color: var(--text-dim);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.btn--lg {
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
  border-radius: 10px;
}

.section-label {
  margin: 56px auto 0;
  padding: 0 24px;
  max-width: 1560px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  max-width: 1560px;
  margin: 14px auto 0;
  padding: 0 24px;
}

.tile-link {
  display: block;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  box-shadow: var(--shadow);
  transition: transform 0.16s, border-color 0.16s;
}

.tile-link:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  transform: translateY(-2px);
}

.tile-link h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

.tile-link p {
  margin: 0;
  font-size: 13px;
  color: var(--text-dim);
}

.tile-link__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.api-group {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.api-group h3 {
  margin-bottom: 12px;
  font-size: 14px;
}

/* 标题做成链到 API 页对应分组，并带上运行时枚举出的条目数 */
.api-group h3 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.api-group h3 a {
  color: inherit;
  text-decoration: none;
}

.api-group h3 a:hover {
  color: var(--accent);
}

.api-group__n {
  padding: 1px 7px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
}

.api-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.api-list li {
  padding: 3px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  background: var(--surface-2);
}

.api-list li:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.footer {
  max-width: 1560px;
  margin: 56px auto 0;
  padding: 22px 24px 40px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  color: var(--muted);
}

.footer code {
  color: var(--text-dim);
}

/* ------------------------------ API 查询页 ------------------------------ */

.api-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.api-search {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--text);
  background: var(--surface-2);
}

.api-search::placeholder {
  color: var(--muted);
}

.api-search:focus {
  border-color: var(--accent);
  outline: none;
}

.api-shown {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.api-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}

.chipbtn {
  padding: 3px 10px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface-2);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.chipbtn:hover {
  color: var(--text-dim);
  border-color: var(--line);
}

.chipbtn.is-on {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--accent-soft);
}

.api-group2 {
  margin-bottom: 22px;
}

.api-group2__title {
  margin: 0 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.api-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.api-item {
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  align-self: start;
  transition: border-color 0.15s, background 0.15s;
}

.api-item:hover {
  border-color: var(--line);
}

.api-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.api-item.is-open {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  background: var(--surface-2);
}

/* 复制按钮固定在右侧，caret 跟在它后面 */
.api-item__caret {
  margin-left: 4px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
  transition: transform 0.15s;
}

.api-item.is-open .api-item__caret {
  transform: rotate(180deg);
}

/* ---------------------------- 详情面板 ---------------------------- */

.api-detail {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
}

.api-sig {
  display: block;
  padding: 6px 9px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  overflow-x: auto;
  white-space: pre;
}

.api-sig--value {
  color: var(--accent);
}

.api-detail__h {
  margin: 12px 0 6px;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.api-opts,
.api-members {
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 11.5px;
}

.api-opts li {
  display: flex;
  gap: 6px;
  padding: 2px 0;
}

.api-opts__v {
  color: var(--text-dim);
}

.api-members li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  color: var(--text);
}

.api-members li.is-inherited code {
  color: var(--text-dim);
}

.api-members__from {
  flex: none;
  padding: 0 5px;
  border-radius: 4px;
  font-size: 10px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  white-space: nowrap;
}

.api-note {
  margin: 10px 0 0;
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
}

.api-item__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.api-item__name {
  font-size: 13px;
  color: var(--accent);
  user-select: all;
}

.api-kind,
.api-arity {
  padding: 1px 6px;
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  white-space: nowrap;
}

.api-item__copy {
  margin-left: auto;
}

.api-item__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* --------------------------- 首页网格游标 ------------------------------- */

/* 层级压在 topbar(60) 之下，游标经过顶栏时被自然遮住 */
/* 参考线层：负 z-index，画在所有静态内容之下，
   这样线条不会压住卡片与按钮里的文字。
   body 的背景会被提升到 canvas，所以这层仍然可见。 */
.cursor-guides-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* 矩形层：仅在 home-cursor.js 的 SHOW_BOX 为 true 时才会被创建 */
.cursor-layer {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
}

.cursor-box {
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 48px;
  opacity: 0;
  /* 放射性淡化直接用径向渐变底色，不用 mask：
     mask 会把贴在盒子边缘的边框一起衰减掉，边框几乎看不见。 */
  background: radial-gradient(circle at 50% 50%,
      color-mix(in srgb, var(--accent) 30%, transparent) 0%,
      color-mix(in srgb, var(--accent) 13%, transparent) 45%,
      transparent 72%);
  will-change: transform;
  transition: opacity 0.18s, background 0.15s;
}

.cursor-layer.is-on .cursor-box {
  opacity: 1;
}

.cursor-box.is-snapped {
  background: radial-gradient(circle at 50% 50%,
      color-mix(in srgb, var(--accent) 46%, transparent) 0%,
      color-mix(in srgb, var(--accent) 20%, transparent) 45%,
      transparent 72%);
}

.cursor-box.is-snapped::before,
.cursor-box.is-snapped::after {
  opacity: 1;
}

.cursor-guide {
  position: absolute;
  background: var(--accent);
  /* 参考线只作辅助提示，整体压得很淡 */
  opacity: 0.3;
  /* 沿长轴两端渐隐到全透明；与端点刻度二选一，这里用渐隐 */
  mask-image: linear-gradient(to bottom,
      transparent 0,
      #000 18%,
      #000 82%,
      transparent 100%);
}

.cursor-guide--h {
  mask-image: linear-gradient(to right,
      transparent 0,
      #000 18%,
      #000 82%,
      transparent 100%);
}

/* 触屏设备没有 hover 语义，直接隐藏 */
@media (pointer: coarse) {
  .cursor-layer {
    display: none;
  }
}

/* ------------------------------ responsive ------------------------------ */

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidenav {
    position: static;
    max-height: none;
    display: flex;
    gap: 14px;
    padding-bottom: 6px;
    overflow-x: auto;
    /* 这时左栏变成横向条、纵向并不溢出，
       纵向继续沿用 contain 会让鼠标停在左栏上时整页滚不动 */
    overscroll-behavior-y: auto;
  }

  .sidenav__group {
    margin-bottom: 0;
  }

  .sidenav__label {
    white-space: nowrap;
  }

  .card__body {
    grid-template-columns: minmax(0, 1fr);
  }

  .card__aside,
  .geo__panel {
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .geo {
    grid-template-columns: minmax(0, 1fr);
  }

  .geo__canvas {
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }
}

@media (max-width: 640px) {
  .topbar__inner {
    padding: 0 14px;
    gap: 10px;
  }

  .topnav {
    display: none;
  }

  .layout,
  .hero,
  .card-grid,
  .section-label,
  .footer {
    padding-left: 14px;
    padding-right: 14px;
  }
}