/* 排石大师（面） — 与壁厚 / 指环工具同系深色 UI */

:root {
  --bg: #0a0a0a;
  --panel: #111111;
  --border: #555;
  --border-soft: #3a3a3a;
  --text: #e8e8e8;
  --muted: #9a9a9a;
  --accent: #7ec8e3;
  --accent-hover: #9ad7ee;
  --input-bg: #1a1a1a;
  --btn-bg: #1c1c1c;
  --btn-hover: #2a2a2a;
  --track: #2a2a2a;
  --thumb: #cfcfcf;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
}

/* iPad：面板控件禁用手写误触；手指正常操作 */
#panel,
#confirm-overlay,
#choice-overlay,
#view-hud,
#stone-pad {
  touch-action: manipulation;
  -webkit-touch-callout: none;
}

#panel button,
#panel select,
#panel label.switch,
#confirm-overlay button,
#choice-overlay button,
#view-hud button,
#stone-pad button {
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

#panel input[type="number"],
#panel input[type="range"],
#confirm-overlay input[type="number"] {
  touch-action: manipulation;
}

#panel input[type="number"],
#confirm-overlay input[type="number"] {
  -webkit-user-select: text;
  user-select: text;
}

/* iPad：文件选择须由手指/笔直接点在 input 上，不能 JS 间接 click */
.file-upload-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: 0;
}

.file-upload-btn input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.01;
  cursor: pointer;
  font-size: 16px;
  z-index: 2;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

label.btn,
label.wf-step {
  -webkit-user-select: none;
  user-select: none;
}

label.btn[aria-disabled="true"],
label.wf-step[aria-disabled="true"] {
  opacity: 0.38;
  pointer-events: none;
  cursor: not-allowed;
}

#app {
  display: grid;
  grid-template-columns: 1fr 280px;
  width: 100%;
  height: 100%;
}

#viewport-wrap {
  position: relative;
  background: #0c0c0c;
  border-right: 1px solid #333;
  min-width: 0;
  min-height: 0;
}

#viewport {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

#busy-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(12, 12, 12, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

#busy-overlay[hidden] {
  display: none !important;
}

/* 法线选区：浮动容差 + 确定/取消 */
#normal-pick-hud {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  z-index: 18;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  pointer-events: none;
}
#normal-pick-hud[hidden] {
  display: none !important;
}
#normal-pick-hud .np-slider-wrap,
#normal-pick-hud .np-actions {
  pointer-events: auto;
}
#normal-pick-hud .np-slider-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 8px;
  background: rgba(18, 18, 18, 0.88);
  border: 1px solid #555;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
}
#normal-pick-hud #normal-tol {
  width: min(42vw, 220px);
  accent-color: #e8a020;
}
#normal-pick-hud #normal-tol-val {
  min-width: 2.6em;
  font-size: 13px;
  color: #f0c070;
  font-variant-numeric: tabular-nums;
}
#normal-pick-hud .np-actions {
  display: flex;
  gap: 10px;
}
#normal-pick-hud .np-btn {
  min-width: 72px;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid #666;
  background: #222;
  color: #ddd;
  cursor: pointer;
  font-size: 14px;
}
#normal-pick-hud .np-ok {
  border-color: #e8a020;
  color: #1a1208;
  background: #e8a020;
}
#normal-pick-hud .np-cancel:hover {
  border-color: #999;
}
.region-tool-row-3 {
  flex-wrap: wrap;
}
.region-tool-row-3 .pierce-side {
  flex: 1 1 auto;
  min-width: 4.5em;
}

#confirm-overlay,
#choice-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 8, 8, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

#confirm-overlay[hidden],
#choice-overlay[hidden] {
  display: none !important;
}

.confirm-card {
  min-width: 320px;
  max-width: min(440px, 92vw);
  padding: 18px 20px 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(22, 22, 22, 0.96);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.confirm-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.confirm-message {
  color: var(--muted);
  line-height: 1.55;
  white-space: pre-line;
  margin-bottom: 16px;
}

.confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.choice-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.choice-options .choice-option {
  width: 100%;
  justify-content: center;
  text-align: center;
}

.confirm-actions .btn {
  min-width: 96px;
  padding: 0 22px;
  height: 36px;
}

.busy-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 22px 28px;
  border: 1px solid #555;
  background: rgba(18, 18, 18, 0.92);
  border-radius: 4px;
  min-width: 200px;
  max-width: min(360px, 88vw);
}

.busy-card.is-progress {
  align-items: stretch;
}

.busy-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #3a3a3a;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: busy-spin 0.75s linear infinite;
  flex-shrink: 0;
  align-self: center;
}

.busy-title {
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  letter-spacing: 0.02em;
}

#busy-text {
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-align: center;
  line-height: 1.45;
}

.busy-card.is-progress #busy-text {
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.busy-steps {
  list-style: none;
  margin: 2px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.busy-steps li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.4;
}

.busy-steps li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  border: 1.5px solid #666;
  flex-shrink: 0;
  box-sizing: border-box;
}

.busy-steps li.is-done {
  color: #b8b8b8;
}

.busy-steps li.is-done::before {
  border-color: #6a9e78;
  background: #6a9e78;
}

.busy-steps li.is-active {
  color: var(--text);
  font-weight: 500;
}

.busy-steps li.is-active::before {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(126, 200, 227, 0.18);
}

.busy-meta {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11.5px;
  text-align: center;
  line-height: 1.5;
}

@keyframes busy-spin {
  to {
    transform: rotate(360deg);
  }
}

#viewport-top-left {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  max-width: min(280px, calc(100% - 24px));
  pointer-events: none;
}

#viewport-ops {
  min-width: 168px;
  padding: 8px 10px 9px;
  background: rgba(10, 10, 10, 0.84);
  border: 1px solid #454545;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  user-select: none;
}

.ops-title {
  font-size: 10px;
  color: #6a6a6a;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

#viewport-ops-body {
  color: #d0d0d0;
  font-size: 11px;
  line-height: 1.45;
  white-space: pre-line;
}

#model-face-info {
  min-width: 120px;
  padding: 8px 10px 9px;
  background: rgba(10, 10, 10, 0.84);
  border: 1px solid #454545;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  user-select: none;
}

#model-face-info[hidden] {
  display: none;
}

#model-face-count {
  color: #d0d0d0;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

#model-face-info.face-warn #model-face-count {
  color: #e0a040;
}

#overlay-legend {
  display: flex;
  flex-direction: column;
  gap: 5px;
  pointer-events: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.85);
  font-weight: 600;
  font-size: 13px;
  padding: 6px 8px;
  background: rgba(10, 10, 10, 0.72);
  border: 1px solid #3a3a3a;
  border-radius: 4px;
}

#overlay-legend[hidden] {
  display: none !important;
}

#overlay-legend .item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #f0f0f0;
}

#overlay-legend .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.22);
}

#hint-stack {
  position: absolute;
  left: 12px;
  bottom: 62px;
  max-width: min(46%, 420px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  pointer-events: none;
  z-index: 2;
}

#hint {
  color: rgba(240, 240, 240, 0.9);
  font-size: 11px;
  text-align: left;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
  line-height: 1.35;
  max-width: 100%;
}

#hint:empty {
  display: none;
}

#status {
  position: static;
  color: var(--muted);
  font-size: 11px;
  opacity: 0.95;
  text-align: left;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
  line-height: 1.35;
  max-width: 100%;
  white-space: pre-line;
}

#lasso-layer {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  cursor: crosshair;
}

#lasso-layer canvas {
  width: 100%;
  height: 100%;
  display: block;
}

#stone-pad {
  position: absolute;
  /* 右上：方位视图（约 108+margin）下方，留空隙不贴紧 */
  right: 14px;
  left: auto;
  top: 140px;
  bottom: auto;
  width: 204px;
  height: 204px;
  z-index: 4;
  pointer-events: none;
}

#stone-pad:not([hidden]) {
  pointer-events: auto;
}

#stone-pad .sp-btn {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #666;
  background: rgba(22, 22, 22, 0.9);
  color: #c8c8c8;
  cursor: pointer;
  padding: 0;
  outline: none;
  /* 悬停不改外观；仅 active/locked 状态变色 */
}

#stone-pad .sp-btn svg {
  width: 22px;
  height: 22px;
  display: block;
}

/* 十字盘中心 5 键：更大 + 可用时蓝色描边/图标 */
#stone-pad .sp-up,
#stone-pad .sp-down,
#stone-pad .sp-left,
#stone-pad .sp-right,
#stone-pad .sp-center {
  border-width: 1.5px;
}

#stone-pad .sp-up:not(:disabled),
#stone-pad .sp-down:not(:disabled),
#stone-pad .sp-left:not(:disabled),
#stone-pad .sp-right:not(:disabled),
#stone-pad .sp-center:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

#stone-pad .sp-up svg,
#stone-pad .sp-down svg,
#stone-pad .sp-left svg,
#stone-pad .sp-right svg {
  width: 28px;
  height: 28px;
}

#stone-pad .sp-center svg {
  width: 32px;
  height: 32px;
}

#stone-pad .sp-up,
#stone-pad .sp-down {
  width: 64px;
  height: 52px;
  border-radius: 4px;
}

#stone-pad .sp-up {
  left: 70px;
  top: 2px;
  border-radius: 10px 10px 4px 4px;
}

#stone-pad .sp-down {
  left: 70px;
  bottom: 2px;
  border-radius: 4px 4px 10px 10px;
}

#stone-pad .sp-left {
  left: 2px;
  top: 76px;
  width: 52px;
  height: 52px;
  border-radius: 10px 4px 4px 10px;
}

#stone-pad .sp-right {
  right: 2px;
  top: 76px;
  width: 52px;
  height: 52px;
  border-radius: 4px 10px 10px 4px;
}

#stone-pad .sp-tl {
  left: 4px;
  top: 4px;
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

#stone-pad .sp-tr {
  right: 4px;
  top: 4px;
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

#stone-pad .sp-bl {
  left: 4px;
  bottom: 4px;
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

#stone-pad .sp-br {
  right: 4px;
  bottom: 4px;
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

#stone-pad .sp-bl.active {
  border-color: #e53935;
  color: #ffefef;
  background: #e53935;
  box-shadow: 0 0 0 1px rgba(229, 57, 53, 0.35);
}

#stone-pad .sp-center {
  left: 57px;
  top: 57px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  z-index: 1;
}

#stone-pad .sp-center .ico-lock {
  display: none;
}
#stone-pad .sp-center .ico-unlock {
  display: block;
}
#stone-pad .sp-center.locked .ico-lock {
  display: block;
}
#stone-pad .sp-center.locked .ico-unlock {
  display: none;
}

#stone-pad .sp-btn.active {
  border-color: var(--accent);
  color: #0a1a22;
  background: var(--accent);
  box-shadow: 0 0 0 1px rgba(120, 200, 230, 0.25);
}

#stone-pad .sp-center.locked {
  border-color: #e0a040;
  color: #1a1208;
  background: #e0a040;
}

#stone-pad .sp-center.unlocked.active {
  border-color: #888;
}

#stone-pad .sp-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

#view-hud {
  position: absolute;
  right: 12px;
  bottom: 10px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  z-index: 3;
  pointer-events: none;
}

#view-hud > * {
  pointer-events: auto;
}

#model-size-bar {
  max-width: min(220px, calc(100vw - 320px));
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  padding: 8px 12px 10px;
  border: 1px solid #454545;
  border-radius: 4px;
  background: rgba(10, 10, 10, 0.84);
  color: #d0d0d0;
  user-select: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

#model-size-bar[hidden] {
  display: none;
}

#result-summary {
  min-width: 168px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 9px 11px;
  background: rgba(10, 10, 10, 0.84);
  border: 1px solid #454545;
  border-radius: 4px;
  font-size: 12px;
  line-height: 1.4;
  color: #a8a8a8;
  user-select: none;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

#result-summary[hidden] {
  display: none !important;
}

#result-summary div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
}

#result-summary span {
  color: #6a6a6a;
  flex: 0 0 auto;
  font-size: 11px;
}

#result-summary b {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
  font-size: 13px;
  color: #ffffff;
}

#result-summary b.rs-warn {
  color: #e8b84a;
}

.msb-dims {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  font-size: 14px;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.msb-line {
  white-space: nowrap;
}

.msb-dims b {
  color: #f2f2f2;
  font-weight: 650;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  margin: 0 2px 0 4px;
}

.msb-unit {
  margin-left: 1px;
  color: var(--muted);
  font-size: 12px;
}

.msb-divider {
  height: 1px;
  background: #4a4a4a;
  margin: 2px 0;
}

.msb-tips {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
}

.msb-lab {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 1px;
}

.msb-tip {
  appearance: none;
  border: 1px solid #5a5a5a;
  background: #222;
  color: #e6e6e6;
  font-size: 13px;
  line-height: 1.3;
  padding: 5px 8px;
  border-radius: 2px;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  text-align: left;
  width: 100%;
  box-sizing: border-box;
}

.msb-tip.tip-dense {
  color: #f0a040;
  border-color: #8a6030;
}
.msb-tip.tip-std {
  color: #5ecf7a;
  border-color: #3a7a4a;
}
.msb-tip.tip-bold {
  color: #5aa8f0;
  border-color: #3a6a9a;
}

.msb-tip:hover:not(:disabled) {
  filter: brightness(1.12);
  background: #2a2a2a;
}

.msb-tip:disabled {
  opacity: 0.45;
  cursor: default;
}

#view-modes {
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  gap: 6px;
}

#app-brand {
  align-self: center;
  margin-right: 2px;
  color: #c8c8c8;
  font-size: 12px;
  letter-spacing: 0.06em;
  user-select: none;
  white-space: nowrap;
}

#app-version {
  align-self: center;
  margin-right: 4px;
  color: #888;
  font-size: 11px;
  letter-spacing: 0.04em;
  opacity: 0.85;
  user-select: none;
}

#view-modes button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 52px;
  height: 48px;
  padding: 4px 2px;
  border: 1px solid #666;
  background: rgba(22, 22, 22, 0.88);
  color: #c8c8c8;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

#view-modes button svg {
  width: 20px;
  height: 20px;
  display: block;
}

#view-modes button span {
  font-size: 10px;
  line-height: 1;
  user-select: none;
}

#view-modes button:hover {
  border-color: #aaa;
  color: #fff;
  background: rgba(40, 40, 40, 0.95);
}

#view-modes button:disabled {
  opacity: 0.38;
  cursor: not-allowed;
  color: #777;
  border-color: #444;
  background: rgba(18, 18, 18, 0.75);
}

#view-modes button:disabled:hover {
  border-color: #444;
  color: #777;
  background: rgba(18, 18, 18, 0.75);
}

#view-modes button.active {
  border-color: var(--accent);
  color: #0a1a22;
  background: var(--accent);
}

#view-modes button.active svg {
  color: #0a1a22;
}

/* —— 右侧面板 —— */
#panel {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-left: 1px solid #444;
  padding: 10px 12px 14px;
  gap: 8px;
  overflow-y: auto;
  overflow-x: hidden;
}

.param-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 0 8px 8px;
  border-radius: 5px;
  border-left: 4px solid var(--group-accent, #555);
  background: var(--group-bg, rgba(255, 255, 255, 0.03));
}

.param-group-title {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  width: calc(100% + 16px);
  margin: 0 -8px;
  padding: 8px 8px 5px 10px;
  border: none;
  border-bottom: 1px solid var(--group-line, #2a2a2a);
  background: var(--group-sticky, #141414);
  color: var(--group-accent, #8a8a8a);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-align: left;
  cursor: pointer;
  user-select: none;
}

.param-group-title:hover {
  filter: brightness(1.08);
}

.param-group-note {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #7a7a7a;
}

.param-group-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.param-group.collapsed .param-group-body {
  display: none;
}

.param-group[data-group="pack"] {
  --group-accent: #6eb8d6;
  --group-bg: rgba(110, 184, 214, 0.1);
  --group-line: rgba(110, 184, 214, 0.4);
  --group-sticky: #141c22;
  --group-track: rgba(110, 184, 214, 0.22);
}

.param-group[data-group="prong"] {
  --group-accent: #d4a35c;
  --group-bg: rgba(212, 163, 92, 0.11);
  --group-line: rgba(212, 163, 92, 0.4);
  --group-sticky: #1f1a14;
  --group-track: rgba(212, 163, 92, 0.22);
}

.param-group[data-group="drain"] {
  --group-accent: #a78bfa;
  --group-bg: rgba(167, 139, 250, 0.1);
  --group-line: rgba(167, 139, 250, 0.42);
  --group-sticky: #1a1524;
  --group-track: rgba(167, 139, 250, 0.22);
}

.param-group[data-group="pierce"] {
  --group-accent: #5eb8e8;
  --group-bg: rgba(94, 184, 232, 0.1);
  --group-line: rgba(94, 184, 232, 0.42);
  --group-sticky: #121a20;
  --group-track: rgba(94, 184, 232, 0.22);
}

.param-group[data-group="honeycomb"] {
  --group-accent: #4ecdc4;
  --group-bg: rgba(78, 205, 196, 0.1);
  --group-line: rgba(78, 205, 196, 0.42);
  --group-sticky: #121c1b;
  --group-track: rgba(78, 205, 196, 0.22);
}

.param-group[data-group="other"] {
  --group-accent: #9a9a9a;
  --group-bg: rgba(154, 154, 154, 0.07);
  --group-line: rgba(154, 154, 154, 0.35);
  --group-sticky: #171717;
  --group-track: rgba(154, 154, 154, 0.2);
}

.param-group.is-active {
  box-shadow: inset 0 0 0 1px var(--group-line, #444);
}

.param-group.is-mode-off {
  opacity: 0.42;
  pointer-events: none;
  filter: grayscale(0.25);
}

.param-group.is-mode-off .param-group-title {
  cursor: not-allowed;
}

.pack-layout-label {
  margin: 6px 0 2px;
  font-size: 12px;
  font-weight: 600;
  color: #c8c8c8;
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.param-group .param-row input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 32px;
  margin: 0;
  background: transparent;
  border: none;
  outline: none;
  min-width: 0;
  touch-action: none;
  cursor: pointer;
}

.param-group .param-row input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--group-track, var(--track));
  border-radius: 3px;
  border: 1px solid var(--group-line, #444);
}

.param-group .param-row input[type="range"]::-moz-range-track {
  height: 6px;
  background: var(--group-track, var(--track));
  border-radius: 3px;
  border: 1px solid var(--group-line, #444);
}

.param-group .param-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--group-accent, var(--thumb));
  border: 1px solid #1a1a1a;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
  outline: 10px solid transparent;
  cursor: pointer;
}

.param-group .param-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--group-accent, var(--thumb));
  border: 1px solid #1a1a1a;
  cursor: pointer;
}

.field-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  align-items: center;
  gap: 6px;
  min-height: 28px;
}

.field-row label {
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  user-select: none;
}

.field-row-switch .field-label,
.pierce-side-label,
.mode-side-label {
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  user-select: none;
}

.mode-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  border-radius: 5px;
  border: 1px solid #333;
  background: rgba(255, 255, 255, 0.02);
}

.mode-block.is-active {
  border-color: rgba(126, 200, 227, 0.45);
  background: rgba(126, 200, 227, 0.06);
}

.mode-block.is-dimmed {
  opacity: 0.55;
}

.mode-extras {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mode-extras[hidden],
#prong-extras[hidden] {
  display: none !important;
}

#prong-extras {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mode-switch-row,
.pierce-switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 28px;
}

.pierce-switch-row > .btn {
  flex: 1;
  min-width: 0;
}

.mode-side,
.pierce-side {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.mode-side:has(input:disabled),
.pierce-side-right.is-disabled {
  opacity: 0.35;
  pointer-events: none;
}

.mode-side .switch,
.pierce-side .switch {
  width: 44px;
  height: 22px;
  flex-shrink: 0;
}

.mode-side-btn {
  flex: 1;
  min-width: 0;
}

.mode-switch-row .switch-slider::before,
.pierce-switch-row .switch-slider::before {
  height: 16px;
  width: 16px;
  left: 2px;
  top: 2px;
}

.mode-switch-row .switch input:checked + .switch-slider::before,
.pierce-switch-row .switch input:checked + .switch-slider::before {
  transform: translateX(22px);
}

.field-row input,
.field-row select,
#min-prongs {
  width: 100%;
  height: 28px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  text-align: center;
  font-size: 12px;
  border-radius: 0;
  outline: none;
}

.field-row select,
#min-prongs {
  text-align: left;
  padding: 0 8px;
  cursor: pointer;
}

.field-row input:focus,
.field-row select:focus,
#min-prongs:focus {
  border-color: var(--accent);
}

.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 26px;
  justify-self: start;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #2a2a2a;
  border: 1px solid #555;
  border-radius: 999px;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 2px;
  top: 2px;
  background: #d0d0d0;
  border-radius: 50%;
  transition: transform 0.18s ease, background 0.18s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.switch input:checked + .switch-slider {
  background: #6eb8e8;
  border-color: #6eb8e8;
}

.switch input:checked + .switch-slider::before {
  transform: translateX(26px);
  background: #f2f2f2;
}

.switch input:focus-visible + .switch-slider {
  outline: 1px solid #6eb8e8;
  outline-offset: 2px;
}

.pierce-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 0;
}

.pierce-block.is-disabled {
  opacity: 0.45;
  pointer-events: none;
}

#pierce-params {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#pierce-params[hidden] {
  display: none;
}

.param-row {
  display: grid;
  grid-template-columns: 40px 1fr 52px;
  align-items: center;
  gap: 8px;
  min-height: 36px;
}

.param-row label {
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  user-select: none;
}

/* 轨道视觉仍细，整体高度加大便于手指 / Apple Pencil（对齐指环大师） */
.param-row input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 32px;
  margin: 0;
  background: transparent;
  border: none;
  outline: none;
  min-width: 0;
  touch-action: none;
  cursor: pointer;
}

.param-row input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--track);
  border-radius: 3px;
  border: 1px solid #444;
}

.param-row input[type="range"]::-moz-range-track {
  height: 6px;
  background: var(--track);
  border-radius: 3px;
  border: 1px solid #444;
}

.param-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--thumb);
  border: 1px solid #888;
  outline: 10px solid transparent;
  cursor: pointer;
}

.param-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--thumb);
  border: 1px solid #888;
  cursor: pointer;
}

.param-row input[type="number"] {
  width: 52px;
  height: 28px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  text-align: center;
  font-size: 12px;
  border-radius: 0;
  outline: none;
}

.param-row input[type="number"]:focus {
  border-color: var(--accent);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.btn-row:has(> :only-child) {
  grid-template-columns: 1fr;
}

.btn-row:has(> :nth-child(3)) {
  grid-template-columns: 1fr 1fr 1fr;
}

/* 区域对称（样式对齐指环大师晶格对称） */
.region-sym-row {
  margin: 4px 0 0;
}

.region-sym-btn {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.region-sym-btn.region-sym-x {
  color: #e74c3c;
  border-color: #7a3a36;
}

.region-sym-btn.region-sym-y {
  color: #2ecc71;
  border-color: #2f6b48;
}

.region-sym-btn.region-sym-z {
  color: #4aa3e8;
  border-color: #2f5f86;
}

.region-sym-btn.region-sym-x:hover:not(:disabled) {
  border-color: #e74c3c;
  background: rgba(231, 76, 60, 0.12);
}

.region-sym-btn.region-sym-y:hover:not(:disabled) {
  border-color: #2ecc71;
  background: rgba(46, 204, 113, 0.12);
}

.region-sym-btn.region-sym-z:hover:not(:disabled) {
  border-color: #4aa3e8;
  background: rgba(74, 163, 232, 0.12);
}

.region-sym-btn.region-sym-x.active {
  color: #fff;
  background: #c0392b;
  border-color: #e74c3c;
}

.region-sym-btn.region-sym-y.active {
  color: #fff;
  background: #27ae60;
  border-color: #2ecc71;
}

.region-sym-btn.region-sym-z.active {
  color: #fff;
  background: #2980b9;
  border-color: #4aa3e8;
}

.region-sym-btn:disabled {
  opacity: 0.38;
}

.pack-layout {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  margin: 4px 0 6px;
}

.pack-layout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 2px;
  border: 1px solid #555;
  background: #1a1a1a;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.12s ease, background 0.12s ease;
}

.pack-layout-btn svg {
  width: 28px;
  height: 28px;
  display: block;
  pointer-events: none;
}

.pack-layout-btn:hover:not(:disabled) {
  border-color: #999;
  background: #262626;
}

.pack-layout-btn.active {
  border-color: var(--accent);
  background: #243038;
  box-shadow: inset 0 0 0 1px rgba(94, 200, 230, 0.35);
}

.pack-layout-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pack-layout-label.is-disabled,
.pack-layout.is-disabled {
  opacity: 0.45;
  pointer-events: none;
}

.btn {
  flex-shrink: 0;
  height: 34px;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.15s ease, border-color 0.15s ease, opacity 0.15s;
}

.btn:hover:not(:disabled) {
  background: var(--btn-hover);
  border-color: #888;
}

.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.btn-primary {
  border-color: #5a9bb0;
  background: var(--accent);
  color: #0a1a22;
  font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-export {
  margin-top: 4px;
  border-color: #5a9bb0;
  background: var(--accent);
  color: #0a1a22;
  font-weight: 600;
}

.btn-export:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn.active-mode {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(126, 200, 227, 0.08);
}

#rotate-pad {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 4px 0 2px;
  margin-top: 4px;
}

#rotate-pad > .btn-rot {
  width: 72px;
}

.rotate-mid {
  display: flex;
  gap: 8px;
  width: 100%;
  justify-content: center;
}

.rotate-mid .btn-rot {
  width: calc(50% - 4px);
  max-width: 88px;
}

.btn-rot {
  height: 34px;
  font-size: 12px;
  line-height: 1;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#rotate-pad .btn-rot-spin .rot-spin-icon {
  width: 20px;
  height: 20px;
  display: block;
  color: #e8e8e8;
}

#rotate-pad .btn-rot-spin:disabled .rot-spin-icon {
  color: #777;
}

#panel::-webkit-scrollbar {
  width: 6px;
}

#panel::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 3px;
}

/* 仅竖屏窄宽上下堆叠。
   iPad 横持时常被父站包成窄栏（CSS 宽 <960），仍应左右布局，勿当竖版。 */
@media (max-width: 960px) and (orientation: portrait) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 48vh;
  }

  #viewport-wrap {
    border-right: none;
  }

  #panel {
    border-left: none;
    border-top: 1px solid #444;
  }
}

/* 横屏矮屏：侧栏略收，给视口更多高度 */
@media (orientation: landscape) and (max-height: 640px) {
  #app {
    grid-template-columns: 1fr min(240px, 34vw);
  }
}

/* 横屏：显式锁左右布局，覆盖父页/iframe 窄宽误触竖版 */
@media (orientation: landscape) {
  #app {
    grid-template-columns: 1fr min(280px, 36vw);
    grid-template-rows: 1fr;
  }

  #viewport-wrap {
    border-right: 1px solid #333;
  }

  #panel {
    border-left: none;
    border-top: none;
  }
}