/* ===================== style.css — NB实验室 视觉（亮色·蓝青） ===================== */
:root {
  --bg: #eef1f6;
  --bg2: #f6f8fc;
  --panel: #ffffff;
  --panel2: #f1f4f9;
  --line: #dde3ec;
  --txt: #1f2a3a;
  --muted: #7a8aa0;
  --accent: #1f8fff;
  --accent2: #00bcd4;
  --ok: #21b97a;
  --danger: #ef476f;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--txt);
  overflow: hidden;
}
a { color: inherit; text-decoration: none; }

/* 移动端控件：桌面隐藏 */
.lab-menu-btn { display: none; }
.lab-overlay { display: none; }

/* 总体布局 */
#lab-app {
  display: grid;
  grid-template-rows: 54px 1fr 58px;
  grid-template-columns: 232px 1fr 286px;
  grid-template-areas: "top top top" "side stage panel" "side trans panel";
  height: 100vh;
}

/* 顶栏（NB 白底蓝青） */
#lab-top {
  grid-area: top;
  display: flex; align-items: center; gap: 14px;
  padding: 0 18px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 4px rgba(31,143,255,.06);
}
.lab-logo {
  font-weight: 900; font-size: 20px; letter-spacing: .5px; color: var(--accent);
  display: flex; align-items: baseline; gap: 2px;
  background: linear-gradient(90deg, #1f8fff, #00bcd4); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.lab-logo .logo-sub { font-size: 15px; font-weight: 700; -webkit-text-fill-color: #1f2a3a; }
.lab-tabs { display: flex; gap: 6px; margin-left: 14px; }
.lab-tab {
  padding: 7px 16px; border-radius: 9px; cursor: pointer; color: var(--muted);
  font-size: 14px; font-weight: 600; border: 1px solid transparent; transition: .15s;
}
.lab-tab:hover { color: var(--accent); background: var(--panel2); }
.lab-tab.active { color: #fff; background: linear-gradient(90deg, #1f8fff, #00bcd4); border-color: transparent; }
.lab-top-spacer { flex: 1; }

/* 侧栏分类树 */
#lab-side {
  grid-area: side;
  background: var(--bg2);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 6px 0 16px;
}
.nav-cat-title {
  font-size: 12px; color: var(--accent); text-transform: uppercase; letter-spacing: 1px;
  padding: 14px 16px 5px; font-weight: 800;
}
.nav-sub-title { font-size: 12px; color: var(--muted); padding: 9px 16px 3px; font-weight: 600; }
.nav-item {
  display: block; padding: 7px 16px 7px 26px; font-size: 13.5px; color: #33425a;
  cursor: pointer; border-left: 3px solid transparent; transition: .12s;
}
.nav-item:hover { background: rgba(31,143,255,.07); color: var(--accent); }
.nav-item.active { background: rgba(31,143,255,.14); border-left-color: var(--accent); color: var(--accent); font-weight: 700; }

/* 舞台（浅色实验台） */
#lab-stage {
  grid-area: stage;
  position: relative;
  background: #eaf0f6;
  display: flex; flex-direction: column; min-width: 0;
}
.sim-header { padding: 12px 18px 2px; }
.sim-header h2 { margin: 0; font-size: 17px; color: #1f2a3a; }
.sim-desc { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.sim-canvas-wrap { flex: 1; min-height: 0; padding: 8px 12px; position: relative; }
.lab-canvas {
  width: 100%; height: 100%; display: block;
  background:
    linear-gradient(#fbfdff, #f2f7fc);
  border: 1px solid var(--line); border-radius: 10px;
  box-shadow: inset 0 0 0 1px rgba(31,143,255,.04);
}
.stage-empty {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 10px; color: var(--muted); text-align: center; padding: 20px;
}
.stage-empty .big { font-size: 40px; }

/* 器材库抽屉 */
#lab-parts {
  position: absolute; left: 12px; top: 12px; z-index: 5;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  width: 158px; max-height: calc(100% - 30px); overflow-y: auto; padding: 8px;
  box-shadow: 0 10px 34px rgba(31,60,110,.18);
}
#lab-parts.hidden { display: none; }
.parts-title { font-size: 12px; color: var(--accent); font-weight: 800; padding: 2px 4px 8px; }
.part {
  display: flex; align-items: center; gap: 9px; padding: 7px 8px; border-radius: 9px;
  cursor: grab; font-size: 13px; color: #33425a; user-select: none; transition: .12s;
}
.part:hover { background: var(--panel2); }
.part:active { cursor: grabbing; }
.part .ico { width: 34px; height: 34px; flex: 0 0 34px; display: flex; align-items: center; justify-content: center; }
.part .ico svg { width: 100%; height: 100%; display: block; }
.dropping { outline: 2px dashed var(--accent); outline-offset: -6px; background: rgba(31,143,255,.05); }
.part.armed { background: var(--accent); color: #fff; box-shadow: 0 3px 10px rgba(31,143,255,.4); }
.part.armed .ico { filter: brightness(1.2); }
.sim-canvas-wrap.placing { cursor: copy; }
.sim-canvas-wrap.placing::after {
  content: '已选器材 · 点击画布放置（Esc 取消）'; position: absolute; left: 50%; top: 10px; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 12px; padding: 5px 12px; border-radius: 999px; z-index: 7;
  pointer-events: none; box-shadow: 0 4px 14px rgba(31,143,255,.35);
}
@media (max-width: 900px) { .sim-canvas-wrap.placing::after { top: 6px; font-size: 11px; padding: 4px 9px; } }

/* 右侧属性面板 */
#lab-panel {
  grid-area: panel;
  background: var(--bg2);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  padding: 14px;
}
.panel-title { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; margin: 4px 0 12px; font-weight: 800; }
.ctl { margin-bottom: 13px; }
.ctl-row { display: flex; justify-content: space-between; align-items: center; font-size: 13px; margin-bottom: 5px; color: #33425a; }
.ctl-val { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.ctl-range { width: 100%; accent-color: var(--accent); }
.ctl-btn {
  width: 100%; padding: 9px; border: none; border-radius: 9px; cursor: pointer;
  background: linear-gradient(90deg, #1f8fff, #00bcd4); color: #fff; font-size: 14px; font-weight: 700;
}
.ctl-btn:hover { filter: brightness(1.05); }
.ctl-btn.ghost { background: var(--panel); color: #33425a; border: 1px solid var(--line); }
.ctl-btn.danger { background: var(--danger); }
.ctl-btn-row { display: flex; gap: 8px; }
.ctl-btn-row .ctl-btn { flex: 1; }
.ctl-toggle { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 13px; color: #33425a; }
.ctl-check { display: none; }
.ctl-track {
  width: 40px; height: 22px; border-radius: 22px; background: #cfd8e3; position: relative; transition: .2s;
}
.ctl-track::after { content: ''; position: absolute; width: 18px; height: 18px; border-radius: 50%; background: #fff; top: 2px; left: 2px; transition: .2s; box-shadow: 0 1px 2px rgba(0,0,0,.2); }
.ctl-check:checked + .ctl-track { background: var(--accent); }
.ctl-check:checked + .ctl-track::after { left: 20px; }
.ctl-select-wrap { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: #33425a; }
.ctl-select { background: var(--panel); color: var(--txt); border: 1px solid var(--line); border-radius: 9px; padding: 8px; }
.ctl-readout {
  display: flex; align-items: baseline; gap: 8px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 9px 12px;
}
.ro-label { font-size: 12px; color: var(--muted); }
.ro-val { font-size: 19px; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; margin-left: auto; }
.ro-unit { font-size: 12px; color: var(--muted); }
.ctl-group { border: 1px solid var(--line); border-radius: 12px; padding: 11px; margin-bottom: 13px; background: var(--panel); }
.ctl-group-title { font-size: 12px; color: var(--accent); font-weight: 800; margin-bottom: 9px; }
.ctl-note { font-size: 12px; color: #5b6b80; line-height: 1.6; background: rgba(31,143,255,.08); border-left: 3px solid var(--accent); padding: 9px 11px; border-radius: 7px; }

/* 底部时间轴控制条（NB 白底） */
#lab-trans {
  grid-area: trans;
  display: flex; align-items: center; gap: 10px; padding: 0 18px;
  background: #ffffff; border-top: 1px solid var(--line);
}
.trans-btn {
  width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); color: #33425a; font-size: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: .12s;
}
.trans-btn:hover { background: #e6edf5; }
.trans-btn.play { background: linear-gradient(90deg, #1f8fff, #00bcd4); border-color: transparent; color: #fff; }
.trans-btn.danger { color: var(--danger); }
.trans-bar { flex: 1; height: 7px; background: var(--panel2); border-radius: 5px; overflow: hidden; position: relative; border: 1px solid var(--line); }
.trans-fill { height: 100%; width: 0; background: linear-gradient(90deg, #1f8fff, #00bcd4); }
.trans-time { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; min-width: 88px; text-align: right; }
.trans-speeds { display: flex; gap: 5px; }
.trans-speed { padding: 5px 10px; border-radius: 7px; border: 1px solid var(--line); background: var(--panel2); color: var(--muted); cursor: pointer; font-size: 12px; font-weight: 600; transition: .12s; }
.trans-speed:hover { color: var(--accent); }
.trans-speed.active { background: linear-gradient(90deg, #1f8fff, #00bcd4); color: #fff; border-color: transparent; }

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: #c2cdda; border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: #aab8c8; }
::-webkit-scrollbar-track { background: transparent; }

/* 菜单 / 属性 切换按钮（仅移动端显示） */
.lab-menu-btn {
  align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); color: #33425a; font-size: 20px; cursor: pointer; flex: 0 0 auto;
}
.lab-menu-btn:active { background: #e6edf5; }

/* 遮罩 */
.lab-overlay {
  position: fixed; inset: 52px 0 56px 0; z-index: 35;
  background: rgba(10,22,42,.38); opacity: 0; pointer-events: none; transition: opacity .25s;
}
.lab-overlay.show { opacity: 1; pointer-events: auto; }

@media (max-width: 900px) {
  /* 单栏：顶栏 / 画布 / 控制条 */
  #lab-app {
    grid-template-columns: 1fr;
    grid-template-rows: 52px 1fr 56px;
    grid-template-areas: "top" "stage" "trans";
  }
  .lab-menu-btn { display: inline-flex; }
  .lab-tabs { flex: 1; overflow-x: auto; margin-left: 8px; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .lab-tabs::-webkit-scrollbar { display: none; }
  .lab-tab { flex: 0 0 auto; padding: 7px 12px; }
  .lab-top-spacer { flex: 0 0 0; }
  .lab-logo { font-size: 16px; }
  .lab-logo .logo-sub { font-size: 13px; }

  /* 侧栏 / 属性面板改为抽屉 */
  #lab-side, #lab-panel {
    position: fixed; top: 52px; bottom: 56px; z-index: 40;
    transition: transform .25s ease; box-shadow: 0 12px 40px rgba(20,40,80,.28);
    height: auto;
  }
  #lab-side { left: 0; width: 80vw; max-width: 280px; transform: translateX(-100%); }
  #lab-panel { right: 0; width: 84vw; max-width: 320px; transform: translateX(100%); }
  #lab-side.open { transform: translateX(0); }
  #lab-panel.open { transform: translateX(0); }

  .sim-canvas-wrap { padding: 6px 8px; }
  .lab-overlay { display: block; }
}

/* 超窄屏微调 */
@media (max-width: 380px) {
  .lab-logo { font-size: 14px; }
  .lab-tab { padding: 7px 9px; font-size: 13px; }
}