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

:root, body.theme-dark {
  --bg0: #0b0e13;
  --bg1: #141926;
  --panel: #12161f;
  --card: #171c28;
  --border: #242c3d;
  --text: #dde4ee;
  --muted: #8b96a8;
  --accent: #4f8cff;
  --accent-soft: rgba(79, 140, 255, .16);
  --btn: #1c2331;
  --btn-hover: #253046;
  --danger: #e05b5b;
  --ok: #3fbf7f;
}

body.theme-light {
  --bg0: #e9edf3;
  --bg1: #f7f9fc;
  --panel: #f2f4f8;
  --card: #ffffff;
  --border: #d5dbe6;
  --text: #23293a;
  --muted: #6b7688;
  --accent: #2f6fe4;
  --accent-soft: rgba(47, 111, 228, .12);
  --btn: #ffffff;
  --btn-hover: #e8edf6;
}

html, body { height: 100%; }

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* 移动端地址栏收起/展开时保持满屏 */
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg0);
  overflow: hidden;
  user-select: none;
  touch-action: manipulation; /* 禁用双击缩放, 提升按钮响应 */
}

/* ---------- 顶栏 ---------- */
#topbar {
  min-height: 44px;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px 12px;
  flex-wrap: wrap;
  padding: 5px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .3px;
  white-space: nowrap;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 6px 8px;
  flex-wrap: wrap;
}

.divider { width: 1px; height: 22px; background: var(--border); flex: 0 0 auto; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--btn);
  color: var(--text);
  font: inherit;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--btn-hover); border-color: var(--accent); }
.btn:active { transform: translateY(1px); background: var(--accent-soft); }
.btn.primary { background: var(--accent); border-color: transparent; color: #fff; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.active { background: var(--accent); border-color: transparent; color: #fff; }
.btn.mini { padding: 3px 10px; font-size: 12px; }

.btn-group { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.btn-group button {
  appearance: none;
  border: none;
  border-right: 1px solid var(--border);
  background: var(--btn);
  color: var(--text);
  font: inherit;
  font-size: 12px;
  padding: 6px 9px;
  cursor: pointer;
}
.btn-group button:last-child { border-right: none; }
.btn-group button:hover { background: var(--btn-hover); }
.btn-group button:active { background: var(--accent); color: #fff; } /* 一次性按钮: 仅按下瞬间高亮 */

/* ---------- 主区域 ---------- */
main { flex: 1; display: flex; min-height: 0; }

#viewport {
  flex: 1;
  position: relative;
  min-width: 0;
  background:
    radial-gradient(1200px 700px at 50% 20%, var(--bg1) 0%, var(--bg0) 70%);
}

#canvas3d { position: absolute; inset: 0; width: 100%; height: 100%; display: block; outline: none; }

/* ---------- 侧栏 ---------- */
#panel {
  width: 280px;
  flex: 0 0 auto;
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
body.panel-hidden #panel { display: none; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  flex: 0 0 auto; /* 高度不足时不压缩卡片, 交给面板滚动 */
}
.card summary {
  list-style: none;
  cursor: pointer;
  padding: 7px 10px;
  font-weight: 600;
  font-size: 12.5px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}
.card summary::-webkit-details-marker { display: none; }
.card summary::before {
  content: "";
  width: 0; height: 0;
  border-left: 5px solid var(--muted);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform .15s;
}
.card[open] summary::before { transform: rotate(90deg); }
.card summary #partsCount { color: var(--muted); font-weight: 400; }

.card-body { padding: 1px 10px 8px; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 3px 0;
  color: var(--text);
}
.row > span:first-child { color: var(--muted); }

/* 开关 */
.tgl { position: relative; display: inline-block; width: 34px; height: 19px; flex: 0 0 auto; }
.tgl input { position: absolute; opacity: 0; width: 0; height: 0; }
.tgl .knob {
  position: absolute; inset: 0;
  background: var(--border);
  border-radius: 19px;
  transition: background .15s;
}
.tgl .knob::after {
  content: "";
  position: absolute;
  top: 2.5px; left: 3px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  transition: transform .15s;
}
.tgl input:checked + .knob { background: var(--accent); }
.tgl input:checked + .knob::after { transform: translateX(14px); }
.tgl input:disabled + .knob { opacity: .4; }

/* 下拉 / 输入 */
.sel {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  padding: 3px 6px;
  max-width: 150px;
}
.inp {
  background: var(--btn);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  padding: 3px 6px;
  width: 82px;
  text-align: right;
}
.inp:focus, .sel:focus { outline: none; border-color: var(--accent); }

/* 分段选择 */
.seg { display: flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.seg button {
  appearance: none; border: none;
  border-right: 1px solid var(--border);
  background: var(--btn);
  color: var(--text);
  font: inherit; font-size: 12px;
  padding: 4px 12px;
  cursor: pointer;
}
.seg button:last-child { border-right: none; }
.seg button.active { background: var(--accent); color: #fff; }
.seg button:disabled { opacity: .45; cursor: default; }
.seg-full { width: 100%; }
.seg-full button { flex: 1; padding: 4px 0; font-size: 11.5px; }

/* 滑块 */
.slider-row { display: flex; align-items: center; gap: 8px; padding: 4px 0; }
.slider-row input[type=range] { flex: 1; accent-color: var(--accent); }
.slider-row span { min-width: 64px; text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }

/* 零件列表 */
.parts-tools { display: flex; gap: 6px; padding: 3px 0 7px; }
.parts-tools .btn { flex: 1; padding: 3px 4px; }
#partsList { list-style: none; max-height: 168px; overflow-y: auto; overscroll-behavior: contain; }
#partsList li {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 2px;
  border-radius: 6px;
}
#partsList li:hover { background: var(--accent-soft); }
#partsList input[type=checkbox] { accent-color: var(--accent); flex: 0 0 auto; }
.part-dot { width: 10px; height: 10px; border-radius: 3px; flex: 0 0 auto; border: 1px solid rgba(0,0,0,.25); }
.part-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.parts-more { color: var(--muted); padding: 4px 2px; }

/* 信息 */
.info-row {
  display: flex; justify-content: space-between; gap: 10px;
  padding: 3px 0;
  border-bottom: 1px dashed var(--border);
}
.info-row:last-child { border-bottom: none; }
.info-row span { color: var(--muted); flex: 0 0 auto; }
.info-row b { font-weight: 500; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 测量 ---------- */
#measureLayer {
  position: absolute; inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 6;
}
#viewport.measuring canvas { cursor: crosshair; }
.m-dot {
  position: absolute;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #ffb02e;
  border: 2px solid rgba(0, 0, 0, .45);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 5px rgba(0, 0, 0, .5);
}
.m-dot.hover { background: #fff; border-color: #ffb02e; }
.m-dot.hover.snap-center { background: #7fd3ff; border-color: #fff; width: 11px; height: 11px; }
.m-dot.hover.snap-vertex { background: #fff; border-color: #ffb02e; }
.m-dot.hover.snap-mid { background: #8ef0a0; border-color: #fff; }
.m-dot.hover.snap-edge { background: #ffd591; border-color: rgba(0,0,0,.45); }
.m-snap-tip {
  position: absolute;
  transform: translate(14px, 14px);
  background: rgba(15, 18, 26, .92);
  border: 1px solid var(--border);
  color: #cfe3ff;
  padding: 1px 7px;
  border-radius: 6px;
  font-size: 11px;
  white-space: nowrap;
}
body.theme-light .m-snap-tip { background: rgba(255,255,255,.95); color: #1f4f86; }
.m-label.bbox { border-color: rgba(79, 140, 255, .55); color: #a9c8ff; }
.m-label {
  position: absolute;
  transform: translate(-50%, -140%);
  background: rgba(15, 18, 26, .92);
  border: 1px solid rgba(255, 176, 46, .55);
  color: #ffd591;
  padding: 2px 8px;
  border-radius: 7px;
  font-size: 11.5px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
body.theme-light .m-label { background: rgba(255, 255, 255, .95); color: #8a5200; }

#measureList { list-style: none; max-height: 150px; overflow-y: auto; }
#measureList li { display: flex; align-items: center; gap: 7px; padding: 3px 2px; }
#measureList .m-d { font-variant-numeric: tabular-nums; white-space: nowrap; font-size: 12px; }
#measureList .m-xyz {
  color: var(--muted); font-size: 11px; flex: 1;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
#measureList .m-del {
  appearance: none; border: none; background: none;
  color: var(--muted); font-size: 14px; line-height: 1;
  cursor: pointer; padding: 2px 5px; border-radius: 5px;
}
#measureList .m-del:hover { color: var(--danger); background: var(--accent-soft); }
#measureList .m-empty { color: var(--muted); }
.measure-foot {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; padding-top: 5px;
}
.tip { color: var(--muted); font-size: 11px; }

/* ---------- 状态栏 ---------- */
#statusbar {
  height: 26px;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 12px;
  font-size: 12px;
  color: var(--muted);
  background: var(--panel);
  border-top: 1px solid var(--border);
  white-space: nowrap;
  overflow: hidden;
}
#statusFile { color: var(--text); max-width: 30%; overflow: hidden; text-overflow: ellipsis; }
#statusbar .hint { margin-left: auto; opacity: .8; overflow: hidden; text-overflow: ellipsis; }

/* 矮窗口进一步压缩行距 */
@media (max-height: 660px) {
  .card summary { padding: 5px 10px; }
  .row { padding: 2px 0; }
  #partsList { max-height: 120px; }
}

/* ---------- 空状态 ---------- */
#emptyState {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  z-index: 5;
}
#emptyState.hidden { display: none; }
.empty-card {
  text-align: center;
  padding: 40px 48px;
  border: 1.5px dashed var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--card) 82%, transparent);
  backdrop-filter: blur(6px);
}
.empty-card h1 { font-size: 19px; margin: 14px 0 8px; }
.empty-card .sub { color: var(--muted); margin-bottom: 6px; }
.empty-card .formats { color: var(--muted); font-size: 12px; opacity: .8; margin-bottom: 20px; }
.empty-actions { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* ---------- 最近打开 ---------- */
.recent-wrap { margin-top: 22px; }
.recent-title {
  font-size: 12px; color: var(--muted);
  margin-bottom: 10px; letter-spacing: .5px;
}
.recent-list {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 10px; max-width: 520px;
}
.recent-card {
  position: relative;
  width: 112px;
  padding: 6px 6px 7px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  transition: border-color .15s, transform .15s;
}
.recent-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.recent-card img {
  width: 100px; height: 72px;
  object-fit: cover; display: block;
  border-radius: 6px;
  background: #0b0e13;
  margin-bottom: 5px;
}
.recent-card .rc-name {
  font-size: 11px; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.recent-card .rc-meta { font-size: 10px; color: var(--muted); }
.rc-del {
  position: absolute; top: 3px; right: 3px;
  display: none;
  width: 18px; height: 18px;
  border: none; border-radius: 6px;
  background: rgba(0, 0, 0, .55);
  color: #fff; font-size: 12px; line-height: 1;
  cursor: pointer;
}
.recent-card:hover .rc-del { display: block; }
.rc-del:hover { background: var(--danger); }

#recentMenu {
  position: fixed;
  z-index: 60;
  min-width: 270px; max-width: 340px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .4);
  padding: 6px;
}
.rm-row {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 7px;
  border-radius: 8px;
  cursor: pointer;
}
.rm-row:hover { background: var(--accent-soft); }
.rm-row img {
  width: 42px; height: 30px;
  object-fit: cover; border-radius: 4px;
  background: #0b0e13; flex: 0 0 auto;
}
.rm-main { flex: 1; min-width: 0; }
.rm-name {
  font-size: 12px; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.rm-meta { font-size: 10.5px; color: var(--muted); }
.rm-del {
  appearance: none; border: none; background: none;
  color: var(--muted); font-size: 14px;
  cursor: pointer; padding: 3px 6px; border-radius: 5px;
  flex: 0 0 auto;
}
.rm-del:hover { color: var(--danger); background: var(--accent-soft); }
.rm-empty { color: var(--muted); padding: 12px; text-align: center; }
.rm-footer {
  display: flex; justify-content: flex-end;
  border-top: 1px solid var(--border);
  margin-top: 5px; padding: 6px 4px 2px;
}

/* ---------- 拖放遮罩 ---------- */
#dropOverlay {
  position: absolute; inset: 0;
  display: none;
  align-items: center; justify-content: center;
  background: rgba(79, 140, 255, .1);
  z-index: 30;
  pointer-events: none;
}
body.dragging #dropOverlay { display: flex; }
.drop-inner {
  padding: 26px 60px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  font-size: 18px;
  color: var(--accent);
  background: color-mix(in srgb, var(--bg0) 70%, transparent);
}

/* ---------- 加载遮罩 ---------- */
#loading {
  position: absolute; inset: 0;
  display: none;
  flex-direction: column;
  align-items: center; justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg0) 55%, transparent);
  backdrop-filter: blur(2px);
  z-index: 40;
}
#loading.show { display: flex; }
.spinner {
  width: 38px; height: 38px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loadingText { color: var(--text); }

/* ---------- 提示 ---------- */
#toast {
  position: absolute;
  left: 50%; bottom: 34px;
  transform: translateX(-50%) translateY(8px);
  padding: 9px 18px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 50;
  max-width: 70%;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.error { border-color: var(--danger); color: var(--danger); }
#toast.ok { border-color: var(--ok); }

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 通用弹窗 (压缩包选择) ---------- */
.modal {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, .55);
  z-index: 70;
}
.modal[hidden] { display: none; } /* display:flex 会压过 hidden 属性, 必须显式隐藏 */
.modal-card {
  width: min(440px, 92vw);
  max-height: 72vh;
  display: flex; flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .5);
}
.modal-title {
  font-weight: 600; font-size: 13.5px;
  margin-bottom: 10px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
#zipList { list-style: none; overflow-y: auto; flex: 1; min-height: 0; }
#zipList li {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 9px;
  border-radius: 8px;
  cursor: pointer;
}
#zipList li:hover { background: var(--accent-soft); }
.zl-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.zl-size { color: var(--muted); flex: 0 0 auto; font-size: 12px; }
.modal-foot { display: flex; justify-content: flex-end; padding-top: 10px; }

/* ---------- 小屏: 侧栏变抽屉 ---------- */
@media (max-width: 820px) {
  main { position: relative; }
  #panel {
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: min(320px, 88vw);
    z-index: 24;
    box-shadow: -14px 0 34px rgba(0, 0, 0, .4);
  }
  #statusbar .hint { display: none; }
  #statusFile { max-width: 45%; }
  .empty-card { padding: 26px 18px; margin: 0 10px; }
  .recent-list { max-width: none; }
}

/* ---------- 触摸设备: 加大点击目标 ---------- */
@media (pointer: coarse) {
  .btn { padding: 9px 14px; }
  .btn-group button { padding: 9px 11px; }
  .seg button { padding: 7px 12px; }
  .seg-full button { padding: 7px 0; }
  .card summary { padding: 10px 12px; }
  .row { padding: 6px 0; }
  .tgl { width: 42px; height: 24px; }
  .tgl .knob::after { width: 18px; height: 18px; top: 3px; left: 3px; }
  .tgl input:checked + .knob::after { transform: translateX(18px); }
  .slider-row input[type=range] { height: 30px; }
  .sel, .inp { padding: 7px 8px; }
  #partsList li, #measureList li { padding: 8px 2px; }
  #partsList input[type=checkbox] { width: 18px; height: 18px; }
  #measureList .m-del, .rm-del { font-size: 17px; padding: 5px 9px; }
  .rc-del { display: block; }
  .rm-row { padding: 9px 8px; }
  #statusbar { height: 30px; }
}