/* ==========================================================================
   方寸 CUBE 3³ — Interactive Puzzle Lab
   ========================================================================== */

:root{
  --bg:#07080b;
  --bg-soft:#0b0d12;
  --panel:rgba(13,15,21,.78);
  --ink:#f2efe7;
  --ink-soft:#d7d3c8;
  --muted:#8d909a;
  --faint:#5a5d67;
  --line:rgba(242,239,231,.12);
  --line-soft:rgba(242,239,231,.065);
  --accent:#ff5d38;
  --accent-deep:#d63b1d;
  --mint:#5ee1c3;
  --yellow:#f2c94c;
  --paper:#f1ede2;
  --paper-2:#e8e1d2;
  --paper-line:rgba(20,18,15,.14);
  --paper-ink:#141311;
  --paper-muted:#6c675d;
  --sans:"Segoe UI Variable Display","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --serif:"Songti SC","STSong","Noto Serif SC","SimSun",serif;
  --mono:"Cascadia Mono","SFMono-Regular","Consolas","Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.8,.24,1);
}

*{box-sizing:border-box}
html,body{height:100%}
html{background:var(--bg)}
body{
  margin:0;
  overflow:hidden;
  color:var(--ink);
  background:
    radial-gradient(1200px 800px at 50% 42%,rgba(39,50,76,.24),transparent 62%),
    radial-gradient(700px 500px at 76% 12%,rgba(255,93,56,.055),transparent 70%),
    radial-gradient(800px 600px at 19% 78%,rgba(94,225,195,.04),transparent 72%),
    var(--bg);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.027) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.027) 1px,transparent 1px);
  background-size:84px 84px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 46%,#000 18%,transparent 75%);
  mask-image:radial-gradient(ellipse at 50% 46%,#000 18%,transparent 75%);
  opacity:.55;
}
body::after{
  content:"";
  position:fixed;inset:0;pointer-events:none;z-index:0;
  opacity:.03;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 140 140' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
}
button,a{font-family:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible{outline:1px solid var(--mint);outline-offset:3px}
::selection{background:var(--accent);color:#120b08}
.hidden{display:none!important}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(242,239,231,.16);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:rgba(242,239,231,.28)}

/* ==========================================================================
   App frame
   ========================================================================== */
.app{
  position:relative;z-index:2;
  height:100dvh;
  display:grid;
  grid-template-rows:76px minmax(0,1fr) 46px;
}

.topbar{
  display:flex;align-items:center;gap:28px;
  padding:0 28px 0 30px;
  border-bottom:1px solid var(--line);
  background:rgba(7,8,11,.58);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  position:relative;z-index:20;
}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;flex:0 0 auto}
.brand-mark{width:34px;height:34px;display:grid;place-items:center;color:var(--ink-soft);opacity:.9}
.brand-mark svg{width:100%;height:100%}
.brand-copy{display:flex;flex-direction:column;gap:3px;line-height:1}
.brand-copy b{font-size:16px;letter-spacing:.08em;font-weight:650}
.brand-copy b em{font-style:normal;color:var(--accent);font-family:var(--mono);font-size:12px;letter-spacing:.05em;margin-left:2px}
.brand-copy small{font-family:var(--mono);font-size:8px;letter-spacing:.22em;color:var(--faint)}

.top-instruction{
  flex:1;display:flex;align-items:center;justify-content:center;gap:14px;
  color:var(--muted);font-size:11.5px;letter-spacing:.035em;white-space:nowrap;
}
.top-instruction b{color:var(--ink-soft);font-weight:550}
.top-instruction i{display:block;width:1px;height:11px;background:var(--line)}
.pulse-dot{width:5px;height:5px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 0 rgba(94,225,195,.42);animation:pulse 2.8s infinite}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(94,225,195,.35)}
  50%{box-shadow:0 0 0 6px rgba(94,225,195,0)}
}

.top-actions{display:flex;align-items:center;gap:6px;flex:0 0 auto}
.tool-btn,.manual-trigger{
  height:36px;border:1px solid transparent;background:transparent;color:var(--muted);
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:0 10px;border-radius:3px;transition:color .2s,border-color .2s,background .2s;
}
.tool-btn .icon{width:17px;height:17px}
.tool-btn .tool-label{font-size:11px;letter-spacing:.05em}
.tool-btn:hover{color:var(--ink);border-color:var(--line);background:rgba(255,255,255,.025)}
.tool-btn[aria-pressed="true"] .icon-sound-off{display:none}
.tool-btn[aria-pressed="false"] .icon-sound-on{display:none}
.tool-btn[aria-pressed="false"]{color:var(--faint)}
.manual-trigger{
  margin-left:8px;padding:0 14px;height:37px;border-color:rgba(255,93,56,.4);
  color:var(--ink);background:rgba(255,93,56,.08);font-size:11.5px;letter-spacing:.08em;
}
.manual-trigger svg{width:15px;height:15px;color:var(--accent);transition:transform .25s var(--ease)}
.manual-trigger:hover{background:rgba(255,93,56,.14);border-color:var(--accent)}
.manual-trigger:hover svg{transform:translate(2px,-2px)}

/* ==========================================================================
   Workspace + panels
   ========================================================================== */
.workspace{
  min-height:0;
  display:grid;
  grid-template-columns:clamp(304px,22vw,352px) minmax(0,1fr) clamp(320px,23.2vw,374px);
}
.panel{
  min-height:0;position:relative;z-index:4;
  background:linear-gradient(180deg,rgba(13,15,21,.72),rgba(9,10,14,.64));
  -webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);
}
.panel-left{border-right:1px solid var(--line)}
.panel-right{border-left:1px solid var(--line);background:linear-gradient(180deg,rgba(16,18,24,.78),rgba(8,9,13,.68))}
.panel-scroll{height:100%;overflow-y:auto;overscroll-behavior:contain;padding:32px 28px 34px 30px}
.panel-right .panel-scroll{padding:32px 26px 30px}

.eyebrow-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:28px}
.eyebrow,.micro-label{
  font-family:var(--mono);font-size:8.5px;letter-spacing:.19em;color:var(--faint);
  text-transform:uppercase;
}
.eyebrow{color:var(--muted)}
.eyebrow-index{font-family:var(--mono);font-size:8.5px;letter-spacing:.11em;color:var(--faint)}
.eyebrow.dark{color:#8b8375}
.micro-label{color:var(--muted)}

.hero-title{
  margin:0 0 22px;
  font-family:var(--serif);
  font-size:clamp(48px,4.25vw,68px);
  line-height:.98;
  font-weight:500;
  letter-spacing:-.075em;
  color:var(--ink);
}
.hero-title em{font-style:normal;color:var(--accent);position:relative}
.hero-title em::after{
  content:"";position:absolute;left:.06em;right:-.02em;bottom:-.08em;height:1px;
  background:linear-gradient(90deg,var(--accent),transparent);opacity:.55;
}
.hero-lede{
  margin:0 0 24px;color:var(--muted);font-size:12px;line-height:1.85;
  max-width:27em;letter-spacing:.01em;
}

.timer-card{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:17px 0 0;
  margin-bottom:22px;
}
.timer-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.state-pill{
  display:inline-flex;align-items:center;gap:7px;height:23px;padding:0 9px;
  border:1px solid var(--line);border-radius:999px;
  font-size:9.5px;letter-spacing:.08em;color:var(--muted);white-space:nowrap;
  transition:color .25s,border-color .25s,background .25s;
}
.state-pill i{width:5px;height:5px;border-radius:50%;background:currentColor;flex:none}
.state-pill[data-state="running"]{color:var(--mint);border-color:rgba(94,225,195,.32);background:rgba(94,225,195,.055)}
.state-pill[data-state="running"] i{animation:pulse 1.8s infinite}
.state-pill[data-state="ready"]{color:var(--yellow);border-color:rgba(242,201,76,.26);background:rgba(242,201,76,.045)}
.state-pill[data-state="solved"]{color:var(--accent);border-color:rgba(255,93,56,.35);background:rgba(255,93,56,.06)}
.state-pill[data-state="scrambling"]{color:var(--ink-soft)}
.timer-display{
  display:flex;align-items:baseline;margin:11px 0 2px;
  font-family:var(--mono);font-weight:400;
  font-size:clamp(50px,4.2vw,66px);line-height:1;letter-spacing:-.085em;
  font-variant-numeric:tabular-nums;color:var(--ink);
  text-shadow:0 0 36px rgba(242,239,231,.06);
}
.timer-frac{font-size:.42em;color:var(--muted);letter-spacing:-.04em;margin-left:2px;transition:color .3s}
.timer-card.is-running .timer-frac{color:var(--mint)}
.timer-note{margin:0 0 16px;font-size:10.5px;color:var(--faint);letter-spacing:.025em;min-height:16px}
.timer-meta{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line-soft);
}
.timer-meta>div{padding:11px 0 13px;display:flex;flex-direction:column;gap:4px;border-right:1px solid var(--line-soft)}
.timer-meta>div:last-child{border-right:0;padding-left:14px}
.timer-meta>div:nth-child(2){padding-left:14px}
.timer-meta span{font-size:9px;letter-spacing:.09em;color:var(--faint)}
.timer-meta b{font-size:14px;line-height:1;font-weight:500;color:var(--ink-soft);font-variant-numeric:tabular-nums}
.timer-meta b.mono{font-size:12.5px;letter-spacing:-.015em}

.primary-actions{display:grid;grid-template-columns:1fr auto;gap:8px;margin-bottom:27px}
.btn{
  position:relative;border-radius:3px;border:1px solid transparent;
  display:inline-flex;align-items:center;justify-content:center;gap:11px;
  min-height:54px;padding:0 16px;font-size:12px;letter-spacing:.04em;
  transition:transform .22s var(--ease),background .22s,border-color .22s,color .22s;
  -webkit-tap-highlight-color:transparent;
}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.btn-primary{
  background:var(--accent);border-color:var(--accent);color:#160b07;
  justify-content:flex-start;padding:0 14px 0 15px;
  box-shadow:0 12px 38px -18px rgba(255,93,56,.65);
}
.btn-primary:hover{background:#ff6f4c;border-color:#ff6f4c}
.btn-primary .btn-icon{
  width:33px;height:33px;border-radius:2px;display:grid;place-items:center;
  background:rgba(22,11,7,.1);border:1px solid rgba(22,11,7,.12);flex:none;
}
.btn-primary .btn-icon svg{width:17px;height:17px}
.btn-copy{display:flex;flex-direction:column;gap:3px;line-height:1;text-align:left;flex:1}
.btn-copy b{font-size:13px;font-weight:650;letter-spacing:.045em}
.btn-copy small{font-family:var(--mono);font-size:7.5px;letter-spacing:.13em;opacity:.62}
.btn-arrow{font-size:17px;line-height:1;margin-left:2px;transition:transform .22s var(--ease)}
.btn-primary:hover .btn-arrow{transform:translate(2px,-2px)}
.btn-quiet{
  background:transparent;border-color:var(--line);color:var(--muted);
  min-width:64px;flex-direction:column;gap:5px;font-size:10px;padding:0 13px;
}
.btn-quiet svg{width:16px;height:16px}
.btn-quiet:hover{border-color:rgba(242,239,231,.3);color:var(--ink);background:rgba(255,255,255,.025)}

.records-head{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:13px}
.records-head h2{margin:3px 0 0;font-size:14px;font-weight:600;letter-spacing:.045em}
.text-btn{
  border:0;background:transparent;color:var(--faint);font-size:9.5px;letter-spacing:.08em;
  padding:4px 0;border-bottom:1px solid transparent;transition:color .2s,border-color .2s;
}
.text-btn:hover{color:var(--ink-soft);border-color:var(--faint)}
.record-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;max-height:236px;overflow-y:auto;overscroll-behavior:contain;padding-right:3px}
body.modal-open{overflow:hidden!important}
.record-list li{display:grid;align-items:center}
.record-empty{
  min-height:54px;padding:13px 14px;border:1px dashed rgba(242,239,231,.1);
  color:var(--faint);font-size:10.5px;line-height:1.65;background:rgba(255,255,255,.012);
}
.record-row{
  grid-template-columns:26px 1fr auto auto;gap:8px;
  padding:10px 0;border-bottom:1px solid var(--line-soft);
  font-size:10.5px;color:var(--muted);
}
.record-row.is-best{color:var(--ink)}
.record-rank{font-family:var(--mono);font-size:8px;color:var(--faint)}
.record-row.is-best .record-rank{color:var(--accent)}
.record-time{font-family:var(--mono);font-size:12px;letter-spacing:-.02em;color:var(--ink-soft);font-variant-numeric:tabular-nums}
.record-row.is-best .record-time{color:var(--accent)}
.record-meta{display:flex;gap:10px;font-family:var(--mono);font-size:8px;color:var(--faint);letter-spacing:.02em}
.record-date{font-family:var(--mono);font-size:8px;color:var(--faint)}
.best-chip{
  display:inline-block;margin-left:6px;padding:1px 4px;border:1px solid rgba(255,93,56,.35);
  font-family:var(--mono);font-size:6.5px;letter-spacing:.08em;color:var(--accent);vertical-align:1px;
}
.left-foot{display:flex;gap:9px;align-items:flex-start;margin-top:24px;padding-top:17px;border-top:1px solid var(--line-soft)}
.solid-dot{width:5px;height:5px;border-radius:50%;background:var(--mint);flex:none;margin-top:5px;box-shadow:0 0 8px rgba(94,225,195,.5)}
.left-foot p{margin:0;font-size:9.5px;line-height:1.7;color:var(--faint)}
.left-foot b{color:var(--muted);font-weight:550}

/* ==========================================================================
   Stage
   ========================================================================== */
.stage{
  position:relative;min-width:0;min-height:0;overflow:hidden;
  background:
    radial-gradient(ellipse 60% 58% at 50% 44%,rgba(31,40,60,.74),rgba(9,11,15,.15) 64%,transparent 76%),
    radial-gradient(ellipse 42% 45% at 50% 53%,rgba(255,93,56,.055),transparent 70%),
    linear-gradient(180deg,rgba(8,9,13,.4),rgba(6,7,10,.75));
  isolation:isolate;
}
.stage::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(circle at 50% 50%,transparent 0 21%,rgba(255,255,255,.03) 21.1%,transparent 21.5%),
    radial-gradient(circle at 50% 50%,transparent 0 33%,rgba(255,255,255,.022) 33.1%,transparent 33.4%),
    radial-gradient(circle at 50% 50%,transparent 0 44%,rgba(255,255,255,.016) 44.1%,transparent 44.4%);
  opacity:.7;
}
.stage-grid{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 48%,#000 0 36%,transparent 74%);
  mask-image:radial-gradient(ellipse at 50% 48%,#000 0 36%,transparent 74%);
  transform:perspective(700px) rotateX(58deg) translateY(18%);
  transform-origin:center 64%;
  opacity:.5;
}
.stage-aura{
  position:absolute;left:50%;top:48%;width:72%;aspect-ratio:1;z-index:0;pointer-events:none;
  transform:translate(-50%,-50%);
  background:radial-gradient(circle,rgba(76,112,160,.12),rgba(15,20,30,.04) 43%,transparent 68%);
  filter:blur(10px);
}
#cube-canvas{
  position:absolute;inset:0;width:100%;height:100%;z-index:2;display:block;
  touch-action:none;cursor:grab;outline:none;
}
#cube-canvas.is-grabbing{cursor:grabbing}
#cube-canvas.on-cube{cursor:crosshair}
.stage-top{
  position:absolute;left:26px;right:26px;top:22px;z-index:5;
  display:flex;justify-content:space-between;align-items:center;pointer-events:none;
}
.stage-chip,.stage-coords{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:8px;letter-spacing:.14em;color:var(--faint);
  border:1px solid rgba(242,239,231,.075);padding:6px 9px;background:rgba(8,9,13,.2);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.live-dot{width:4px;height:4px;border-radius:50%;background:var(--mint);box-shadow:0 0 7px rgba(94,225,195,.75);animation:pulse 2.5s infinite}
.stage-coords{gap:6px;color:rgba(242,239,231,.24)}
.stage-coords i{font-style:normal;opacity:.4}
.stage-side-note{
  position:absolute;left:24px;top:50%;transform:translateY(-50%);z-index:4;
  writing-mode:vertical-rl;text-orientation:mixed;
  font-family:var(--mono);font-size:7px;letter-spacing:.3em;line-height:1.9;color:rgba(242,239,231,.19);
  pointer-events:none;
}
.stage-side-note span{color:rgba(255,93,56,.52);letter-spacing:.12em}
.stage-bottom{
  position:absolute;left:28px;right:28px;bottom:20px;z-index:5;
  display:flex;align-items:flex-end;justify-content:space-between;gap:20px;pointer-events:none;
}
.gesture-legend{display:flex;align-items:center;gap:19px;flex-wrap:wrap}
.gesture-legend>span{display:flex;align-items:center;gap:7px;font-size:9px;letter-spacing:.04em;color:var(--faint)}
.gesture-legend b{font-weight:500;color:var(--muted)}
.gesture-icon{width:14px;height:14px;display:inline-block;position:relative;flex:none;opacity:.65}
.gesture-drag::before{content:"";position:absolute;inset:3px 1px;border:1px solid var(--muted);border-radius:1px}
.gesture-drag::after{content:"";position:absolute;left:4px;top:6px;width:6px;height:1px;background:var(--muted);box-shadow:0 3px 0 var(--muted)}
.gesture-orbit{border:1px solid var(--muted);border-radius:50%}
.gesture-orbit::before{content:"";position:absolute;inset:3px 0;border-top:1px solid var(--muted);border-bottom:1px solid var(--muted);border-radius:50%;transform:rotate(-22deg)}
.gesture-wheel{border:1px solid var(--muted);border-radius:7px}
.gesture-wheel::before{content:"";position:absolute;left:50%;top:2px;width:1px;height:4px;background:var(--muted);transform:translateX(-50%)}
.stage-hint{
  max-width:260px;text-align:right;display:flex;align-items:flex-start;gap:10px;justify-content:flex-end;
  border-top:1px solid rgba(242,239,231,.09);padding-top:9px;
}
.hint-index{font-family:var(--mono);font-size:7px;color:var(--accent);letter-spacing:.1em;line-height:1.6}
.stage-hint p{margin:0;font-size:9.5px;line-height:1.65;color:var(--faint);letter-spacing:.02em;text-align:left}
.stage-corner{position:absolute;width:16px;height:16px;z-index:4;pointer-events:none;opacity:.42}
.stage-corner-tl{left:15px;top:15px;border-left:1px solid var(--line);border-top:1px solid var(--line)}
.stage-corner-br{right:15px;bottom:15px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}

.layer-indicator{
  position:absolute;left:50%;top:94px;z-index:6;transform:translate(-50%,-8px);
  display:flex;align-items:center;gap:10px;padding:7px 12px;
  border:1px solid rgba(94,225,195,.22);background:rgba(9,15,16,.72);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  font-family:var(--mono);font-size:8px;letter-spacing:.13em;color:var(--mint);
  opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;
}
.layer-indicator.visible{opacity:1;transform:translate(-50%,0)}
.layer-indicator b{font-weight:500;font-size:10px;color:var(--ink-soft);min-width:26px;text-align:right}
.layer-indicator span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--mint);display:inline-block;margin-right:6px;vertical-align:1px}

/* ==========================================================================
   Right manual panel
   ========================================================================== */
.manual-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:13px}
.manual-head h2{margin:8px 0 0;font-size:20px;line-height:1.1;letter-spacing:.01em;font-weight:550}
.manual-seal{
  width:38px;height:38px;border:1px solid rgba(255,93,56,.35);color:var(--accent);
  display:grid;place-items:center;font-family:var(--serif);font-size:19px;flex:none;
  transform:rotate(1.5deg);background:rgba(255,93,56,.035);
}
.manual-intro{margin:0 0 24px;font-size:10.5px;line-height:1.75;color:var(--faint);letter-spacing:.015em}
.method-rail{position:relative;display:flex;justify-content:space-between;align-items:center;margin-bottom:4px;padding:0 1px}
.method-rail::before{content:"";position:absolute;left:2px;right:2px;top:50%;height:1px;background:linear-gradient(90deg,rgba(255,93,56,.55),rgba(242,239,231,.1))}
.method-rail i{width:5px;height:5px;border-radius:50%;background:var(--accent);position:relative;z-index:1;box-shadow:0 0 10px rgba(255,93,56,.55)}
.method-rail span{position:relative;z-index:1;background:#0e1016;padding:0 6px;font-family:var(--mono);font-size:6.5px;letter-spacing:.13em;color:var(--faint)}
.method-list{list-style:none;margin:0;padding:0}
.method-item{border-bottom:1px solid var(--line-soft)}
.method-btn{
  width:100%;display:grid;grid-template-columns:27px minmax(0,1fr) auto;gap:8px;align-items:start;
  padding:13px 2px 12px;background:none;border:0;color:var(--ink-soft);text-align:left;
  transition:padding-left .22s var(--ease),background .22s;
}
.method-btn:hover{padding-left:9px;background:linear-gradient(90deg,rgba(255,93,56,.045),transparent)}
.method-num{font-family:var(--mono);font-size:8px;color:var(--accent);letter-spacing:.04em;padding-top:2px}
.method-main b{display:block;font-size:12.5px;font-weight:550;letter-spacing:.045em;color:var(--ink-soft)}
.method-main span{display:block;margin-top:4px;font-family:var(--mono);font-size:8.5px;line-height:1.45;color:var(--faint);letter-spacing:.015em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.method-arrow{font-size:12px;color:var(--faint);opacity:.5;transition:transform .2s,color .2s;padding-top:1px}
.method-btn:hover .method-arrow{color:var(--accent);transform:translateX(3px);opacity:1}
.full-manual{
  width:100%;margin-top:17px;padding:13px 13px;display:flex;align-items:center;gap:11px;
  border:1px solid rgba(242,239,231,.13);background:rgba(255,255,255,.022);
  color:var(--ink);text-align:left;transition:background .22s,border-color .22s;
}
.full-manual:hover{border-color:rgba(94,225,195,.34);background:rgba(94,225,195,.04)}
.full-manual-icon{width:28px;height:28px;display:grid;place-items:center;border:1px solid rgba(94,225,195,.24);color:var(--mint);flex:none}
.full-manual-icon svg{width:16px;height:16px}
.full-manual>span:nth-child(2){flex:1;display:flex;flex-direction:column;gap:3px}
.full-manual b{font-size:11px;font-weight:550;letter-spacing:.04em}
.full-manual small{font-family:var(--mono);font-size:7px;letter-spacing:.06em;color:var(--faint)}
.full-manual-arrow{color:var(--mint);font-size:13px;transition:transform .2s}
.full-manual:hover .full-manual-arrow{transform:translateX(3px)}
.manual-footnote{margin-top:24px;padding-top:15px;border-top:1px solid var(--line-soft)}
.manual-footnote>span{font-family:var(--mono);font-size:7px;letter-spacing:.15em;color:var(--faint)}
.manual-footnote p{margin:8px 0 0;font-size:8.5px;line-height:1.9;color:var(--muted);display:flex;flex-wrap:wrap;align-items:center;gap:3px 5px}
.manual-footnote i{width:6px;height:6px;background:var(--c);display:inline-block;border-radius:1px;margin-right:1px}

/* ==========================================================================
   Status bar
   ========================================================================== */
.statusbar{
  position:relative;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:0 30px;border-top:1px solid var(--line);
  background:rgba(7,8,11,.7);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  font-size:9px;color:var(--faint);letter-spacing:.045em;
}
.status-left,.status-center,.status-right{display:flex;align-items:center;gap:12px}
.solid-pill{display:inline-flex;align-items:center;gap:6px;color:rgba(94,225,195,.75);font-family:var(--mono);font-size:7.5px;letter-spacing:.11em}
.solid-pill i{width:4px;height:4px;background:var(--mint);border-radius:50%;box-shadow:0 0 7px rgba(94,225,195,.65)}
.status-sep{width:1px;height:10px;background:var(--line)}
.kbd-hint{display:flex;align-items:center;gap:3px;white-space:nowrap}
.kbd-hint kbd{
  display:inline-grid;place-items:center;min-width:17px;height:17px;padding:0 3px;margin:0 1px;
  border:1px solid rgba(242,239,231,.14);border-radius:2px;background:rgba(255,255,255,.025);
  color:var(--muted);font-family:var(--mono);font-size:7px;line-height:1;
}
.status-right{font-size:7px;letter-spacing:.12em;color:rgba(242,239,231,.2)}

/* ==========================================================================
   Modal base
   ========================================================================== */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:30px}
.modal-backdrop{position:absolute;inset:0;background:rgba(3,4,7,.76);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}
.modal-backdrop::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 50% 50%,transparent 0 20%,rgba(0,0,0,.28) 80%);
}

/* ==========================================================================
   Manual book
   ========================================================================== */
.manual-book{
  position:relative;z-index:2;
  width:min(1160px,calc(100vw - 60px));height:min(760px,calc(100dvh - 60px));
  display:grid;grid-template-columns:250px minmax(0,1fr);
  background:var(--paper);color:var(--paper-ink);
  box-shadow:0 50px 120px -36px rgba(0,0,0,.85),0 0 0 1px rgba(255,255,255,.12);
  overflow:hidden;
  animation:book-in .55s var(--ease) both;
}
@keyframes book-in{from{opacity:0;transform:translateY(24px) scale(.985)}to{opacity:1;transform:none}}
.manual-nav-col{
  position:relative;background:#151516;color:#ece6d8;padding:27px 23px 22px;
  display:flex;flex-direction:column;overflow:hidden;
}
.manual-nav-col::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.06;
  background-image:linear-gradient(rgba(255,255,255,.35) 1px,transparent 1px);
  background-size:100% 4px;
}
.manual-brand{display:flex;align-items:center;gap:10px;margin-bottom:34px;position:relative;z-index:1}
.manual-brand-mark{
  width:34px;height:34px;display:grid;place-items:center;flex:none;
  border:1px solid rgba(255,93,56,.54);color:#ff7a59;font-family:var(--mono);font-size:10px;letter-spacing:-.05em;
}
.manual-brand b{display:block;font-family:var(--serif);font-size:14px;font-weight:600;letter-spacing:.08em}
.manual-brand small{display:block;margin-top:3px;font-family:var(--mono);font-size:6.5px;letter-spacing:.16em;color:rgba(236,230,216,.35)}
.manual-nav{display:flex;flex-direction:column;position:relative;z-index:1;flex:1}
.manual-nav button{
  display:grid;grid-template-columns:22px 1fr auto;gap:7px;align-items:center;
  padding:12px 3px 12px 0;background:none;border:0;border-top:1px solid rgba(236,230,216,.09);
  color:rgba(236,230,216,.38);text-align:left;font-size:11px;letter-spacing:.08em;
  transition:color .2s,padding-left .2s;
}
.manual-nav button:last-child{border-bottom:1px solid rgba(236,230,216,.09)}
.manual-nav button span:first-child{font-family:var(--mono);font-size:7px;color:rgba(255,122,89,.42)}
.manual-nav button em{font-style:normal;font-family:var(--mono);font-size:6px;letter-spacing:.12em;opacity:.4}
.manual-nav button:hover{color:rgba(236,230,216,.8);padding-left:4px}
.manual-nav button.active{color:#f7f1e3;padding-left:4px}
.manual-nav button.active span:first-child{color:var(--accent)}
.manual-nav button.active::after{content:"";width:15px;height:1px;background:var(--accent)}
.manual-nav-foot{margin-top:22px;padding-top:15px;border-top:1px solid rgba(236,230,216,.09);position:relative;z-index:1}
.manual-nav-foot span{font-family:var(--mono);font-size:6.5px;letter-spacing:.13em;color:rgba(236,230,216,.25)}
.manual-nav-foot p{margin:8px 0 0;font-size:8.5px;line-height:1.7;color:rgba(236,230,216,.3)}

.manual-page{
  position:relative;min-width:0;min-height:0;overflow:hidden;display:flex;flex-direction:column;
  background:
    radial-gradient(circle at 15% 5%,rgba(255,255,255,.65),transparent 38%),
    radial-gradient(circle at 90% 90%,rgba(221,210,187,.4),transparent 50%),
    var(--paper);
}
.manual-page::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;opacity:.28;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23p)' opacity='.16'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;
}
.manual-top{
  position:relative;z-index:1;flex:none;
  display:flex;justify-content:space-between;align-items:flex-start;gap:20px;
  padding:27px 36px 20px;border-bottom:1px solid rgba(20,18,15,.16);
}
.manual-top .eyebrow{color:#948b7c}
.manual-top h2{margin:7px 0 0;font-family:var(--serif);font-size:clamp(22px,2.3vw,30px);letter-spacing:.02em;font-weight:600}
.manual-top-actions{display:flex;align-items:center;gap:17px}
.manual-edition{font-family:var(--mono);font-size:7px;letter-spacing:.15em;color:#9a9284;padding-top:4px}
.manual-close{
  width:34px;height:34px;border:1px solid rgba(20,18,15,.2);background:transparent;
  color:#403c35;font-size:21px;line-height:1;font-weight:300;
  display:grid;place-items:center;transition:background .2s,color .2s,border-color .2s;
}
.manual-close:hover{background:#141311;color:var(--paper);border-color:#141311}
.manual-content{position:relative;z-index:1;flex:1 1 auto;min-height:0;overflow-y:auto;padding:30px 38px 60px;overscroll-behavior:contain;scroll-behavior:smooth}
.manual-content::-webkit-scrollbar-thumb{background:rgba(20,18,15,.22)}
.manual-section{display:none;animation:section-in .35s var(--ease) both}
.manual-section.active{display:block}
@keyframes section-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.manual-section-head{max-width:680px;margin-bottom:28px}
.manual-section-head .manual-kicker{display:block;font-family:var(--mono);font-size:7.5px;letter-spacing:.17em;color:#9a9182;margin-bottom:9px}
.manual-section-head h3{margin:0 0 8px;font-family:var(--serif);font-size:32px;line-height:1.12;font-weight:600;letter-spacing:.01em}
.manual-section-head p{margin:0;color:var(--paper-muted);font-size:11.5px;line-height:1.8;max-width:62ch}
.manual-rule{display:flex;align-items:center;gap:12px;margin:25px 0;color:#a09787}
.manual-rule::after{content:"";flex:1;height:1px;background:var(--paper-line)}
.manual-rule span{font-family:var(--mono);font-size:7px;letter-spacing:.15em}
.manual-lead{font-size:12px;line-height:1.85;color:#4e4a42}
.manual-note{
  margin:18px 0;padding:14px 17px;border-left:2px solid var(--accent);
  background:rgba(255,93,56,.055);font-size:10.5px;line-height:1.8;color:#4a453d;
}
.manual-note b{color:#231f1a}
.manual-note.mint{border-left-color:#1b9e87;background:rgba(27,158,135,.055)}

/* notation */
.face-map{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:25px 0 32px}
.face-card{border:1px solid rgba(20,18,15,.15);background:rgba(255,255,255,.22);padding:13px 14px}
.face-card .face-glyph{font-family:var(--mono);font-size:25px;line-height:1;color:#26231e;display:block;margin-bottom:7px}
.face-card b{display:block;font-size:10.5px;letter-spacing:.06em}
.face-card span{display:block;margin-top:4px;font-size:8.5px;color:#837b6d;line-height:1.5}
.face-card.cube-side{border-top:3px solid var(--c)}
.notation-table{width:100%;border-collapse:collapse;margin:15px 0 25px;font-size:10.5px}
.notation-table th{font-family:var(--mono);font-size:7.5px;letter-spacing:.12em;color:#948b7c;text-align:left;font-weight:400;padding:8px 10px;border-bottom:1px solid rgba(20,18,15,.3)}
.notation-table td{padding:10px;border-bottom:1px solid var(--paper-line);line-height:1.6;color:#4b463d;vertical-align:top}
.notation-table td:first-child{font-family:var(--mono);font-size:12px;color:#1b1813;width:74px}
.notation-table tr:last-child td{border-bottom:0}

/* manual diagrams */
.manual-figure{margin:20px 0 22px;padding:16px 18px 12px;border:1px solid rgba(20,18,15,.13);background:rgba(255,255,255,.2);overflow-x:auto}
.manual-figure figcaption{margin-top:12px;padding-top:9px;border-top:1px solid var(--paper-line);font-size:8.5px;line-height:1.65;color:#80776a}
.cube-net{display:grid;grid-template-columns:repeat(4,68px);grid-template-rows:repeat(3,68px);gap:5px;width:max-content;margin:6px auto 3px;padding:0 2px}
.cube3d{display:block;width:100%;max-width:205px;height:auto;margin:3px auto 1px;filter:drop-shadow(0 7px 10px rgba(20,18,15,.12))}
.case-card .cube3d{max-width:150px}
.diagram-flow .cube3d{max-width:150px}
.manual-figure .cube3d{max-width:230px}
.net-slot{min-width:0;min-height:0}
.net-face{position:relative;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);gap:2px;width:100%;height:100%;padding:4px;background:#b9b09f;border:1px solid rgba(20,18,15,.35);box-shadow:0 3px 9px rgba(20,18,15,.08)}
.net-tag{position:absolute;left:5px;top:-10px;z-index:2;font-family:var(--mono);font-size:6px;letter-spacing:.08em;color:#645c4f;background:var(--paper);padding:0 2px;line-height:1.4}
.st{display:block;min-width:0;min-height:0;border-radius:2px;box-shadow:inset 0 0 0 1px rgba(20,18,15,.13)}
.st-x{background:rgba(255,255,255,.16);box-shadow:inset 0 0 0 1px rgba(20,18,15,.07)}
.st-y{background:#efc84a}
.st-w{background:#f4f0e4}
.st-g{background:#35b47c}
.st-b{background:#3b7fe4}
.st-r{background:#e6493e}
.st-o{background:#ec8a22}
.st-k{background:#1a1917}
.face-pair{display:flex;align-items:flex-end;gap:4px}
.mini-face{position:relative;display:grid;grid-template-columns:repeat(3,15px);grid-template-rows:repeat(3,15px);gap:1px;padding:3px;background:#b9b09f;border:1px solid rgba(20,18,15,.28)}
.mini-face .mini-tag{position:absolute;left:3px;top:-9px;font-family:var(--mono);font-size:5.5px;color:#756c5d;background:var(--paper);padding:0 1px}
.diagram-flow{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin:10px 0 4px}
.flow-item{display:flex;align-items:center;gap:5px;min-width:0}
.flow-arrow{font-size:13px;color:#b1a797;flex:none}
.flow-formula{display:flex;flex-direction:column;gap:4px;align-items:flex-start}
.flow-formula .alg{font-size:9.5px}
.flow-formula small{font-size:7px;color:#8b8173}
.flow-formula.is-no{color:#b04a34}
.flow-formula.is-no .alg{color:#b04a34}
.flow-result{display:flex;flex-direction:column;gap:3px;padding:7px 9px;border-left:2px solid #238b71;background:rgba(35,139,113,.06);min-width:92px}
.flow-result b{font-size:9px;line-height:1.4;color:#1b725d}
.flow-result small{font-size:7.5px;line-height:1.5;color:#7b8d85}
.flow-result.is-no{border-left-color:#c2543b;background:rgba(194,84,59,.05)}
.flow-result.is-no b{color:#a5412c}
.flow-result.is-no small{color:#9d7d72}
.orientation-card .cube3d{max-width:112px;margin-bottom:5px}
.diagram-grid{display:grid;gap:12px;margin:16px 0 18px}
.diagram-grid.two{grid-template-columns:1fr 1fr}
.diagram-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.diagram-card{border:1px solid rgba(20,18,15,.14);background:rgba(255,255,255,.2);padding:13px 14px;min-width:0}
.diagram-card.is-ok{border-top:3px solid #238b71;background:rgba(35,139,113,.045)}
.diagram-card.is-wrong{border-top:3px solid #c2543b;background:rgba(194,84,59,.045)}
.diagram-card h4{margin:0 0 8px;font-size:10.5px;line-height:1.4;display:flex;align-items:center;gap:6px}
.diagram-card p{margin:0 0 8px;font-size:9.3px;line-height:1.65;color:#5e574b}
.badge{display:inline-grid;place-items:center;width:15px;height:15px;border-radius:50%;font-size:8px;flex:none;font-family:var(--mono)}
.badge.is-ok{background:rgba(35,139,113,.14);color:#1b725d}
.badge.is-no{background:rgba(194,84,59,.13);color:#a5412c}
.case-card{border:1px solid rgba(20,18,15,.14);background:rgba(255,255,255,.2);min-width:0;padding:13px 14px;display:flex;flex-direction:column;gap:8px}
.case-head{display:flex;flex-direction:column;gap:3px}
.case-kicker{font-family:var(--mono);font-size:6.5px;letter-spacing:.12em;color:#a09786}
.case-head h4{margin:0;font-size:12px;line-height:1.3;font-weight:600}
.case-figure{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;padding:6px 0 3px}
.uface{display:grid;grid-template-columns:repeat(3,25px);grid-template-rows:repeat(3,25px);gap:2px;padding:4px;background:#b9b09f;border:1px solid rgba(20,18,15,.3);box-shadow:0 3px 9px rgba(20,18,15,.07)}
.u-mark{position:relative;outline:2px solid #1c1a16;outline-offset:-1px}
.u-mark::after{content:"✓";position:absolute;inset:0;display:grid;place-items:center;font:700 10px/1 var(--mono);color:#1c1a16;text-shadow:0 1px 0 rgba(255,255,255,.4)}
.case-body{display:flex;flex-direction:column;gap:6px}
.case-body p{margin:0;font-size:9.1px;line-height:1.6;color:#5f574b}
.case-body .alg{font-size:9.5px}
.case-arrow{font-size:20px;line-height:1;color:#a65a40}
.orphan-note{font-size:8.5px;line-height:1.6;color:#8a7f70}
.orientation-card{display:flex;flex-direction:column;gap:4px;padding:10px 11px;border:1px solid rgba(20,18,15,.12);background:rgba(255,255,255,.17);font-size:9px}
.orientation-card b{font-size:10px}
.orientation-card small{font-size:7.5px;color:#8b8172}
.orientation-dot{width:9px;height:9px;border-radius:2px;display:block;margin-bottom:2px}
.orientation-dot.is-r{background:#e6493e}.orientation-dot.is-f{background:#35b47c}.orientation-dot.is-u{background:#efc84a}
.step-caution{display:block}
.keyboard-guide{display:grid;grid-template-columns:minmax(0,1fr) 1.05fr;gap:20px;align-items:center;border:1px solid rgba(20,18,15,.14);background:rgba(255,255,255,.18);padding:16px 18px;margin:18px 0 22px}
.keyboard-copy h4{margin:0 0 7px;font-size:12px}
.keyboard-copy p{margin:0;font-size:9.3px;line-height:1.7;color:#5c554a}
.keycap-row{display:flex;align-items:center;flex-wrap:wrap;gap:5px;margin:10px 0 8px}
kbd{display:inline-grid;place-items:center;min-width:27px;height:27px;padding:0 5px;border:1px solid rgba(20,18,15,.3);border-bottom-width:3px;background:linear-gradient(#fff,#ece6d9);font-family:var(--mono);font-size:11px;color:#28231d;box-shadow:0 2px 0 rgba(20,18,15,.07)}
.key-suffix{font-family:var(--mono);font-size:8px;color:#9e4e37;margin-left:-2px}
.key-hint{font-size:8.8px!important;color:#7d7466!important}
.keyboard-figure{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;padding:10px;border-left:1px solid var(--paper-line);min-height:100px}
.keyboard-figure .keycap-row{margin:0;justify-content:center}
.mouse-guide{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0 24px}
.mouse-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:14px 10px;border:1px solid rgba(20,18,15,.13);background:rgba(255,255,255,.16)}
.mouse-icon{font-size:26px;line-height:1;color:#b45b3f;margin-bottom:7px}
.mouse-card b{font-size:9.5px;line-height:1.4}
.mouse-card small{font-size:7.5px;color:#8a8071;margin-top:3px}
.pll-demo{display:flex;align-items:center;gap:18px;justify-content:center;flex-wrap:wrap}
.pll-arrows{display:grid;grid-template-columns:repeat(3,32px);grid-template-rows:22px 22px;align-items:center;justify-items:center;font-size:16px;color:#a65a40}
.pll-arrows span:nth-child(1){grid-column:1;grid-row:1}.pll-arrows span:nth-child(2){grid-column:2;grid-row:1}.pll-arrows span:nth-child(3){grid-column:3;grid-row:1}
.pll-arrows small{grid-column:1/4;grid-row:2;font-size:7.5px;line-height:1.5;color:#8b8172;white-space:nowrap}
.cycle-arrows{display:flex;justify-content:space-around;flex:0 0 100%;width:100%;font-size:18px;line-height:1;color:#a65a40;padding:4px 2px 0}
.cycle-arrows.is-reverse{color:#3c7f6d}
.slot-demo{display:flex;flex-direction:column;gap:8px;align-items:center}
.slot-label{font-family:var(--mono);font-size:6.5px;letter-spacing:.1em;color:#8c8273}
.slot-demo.is-done .slot-label{color:#1b725d}
.manual-note.mint + .diagram-grid{margin-top:8px}
.alg{
  display:inline-flex;flex-wrap:wrap;gap:4px;align-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.02em;color:#1d1a15;line-height:1.6;
}
.alg-token{display:inline-block;padding:2px 5px;border:1px solid rgba(20,18,15,.16);background:rgba(255,255,255,.34);white-space:nowrap}
.alg-token.has-prime{color:#a63c27;border-color:rgba(166,60,39,.22);background:rgba(166,60,39,.045)}
.alg-token.has-two{color:#2a6a5c;border-color:rgba(42,106,92,.2)}
.manual-step{padding:27px 0 5px;border-top:1px solid rgba(20,18,15,.16)}
.manual-step:first-of-type{border-top:0;padding-top:0}
.step-head{display:grid;grid-template-columns:48px minmax(0,1fr);gap:19px;align-items:start}
.step-number{font-family:var(--serif);font-size:42px;line-height:.8;color:var(--accent);letter-spacing:-.05em;opacity:.92}
.step-head h3{margin:0 0 4px;font-family:var(--serif);font-size:25px;line-height:1.1;font-weight:600;letter-spacing:.01em}
.step-head .step-sub{font-family:var(--mono);font-size:7px;letter-spacing:.15em;color:#9c9384;text-transform:uppercase}
.step-body{padding-left:67px}
.step-body>p{margin:12px 0;font-size:10.8px;line-height:1.8;color:#504a40}
.step-alg{
  display:flex;align-items:flex-start;gap:12px;margin:13px 0;
  padding:12px 14px;background:var(--paper-2);border-left:2px solid #25221c;
}
.step-alg .alg-label{flex:none;font-family:var(--mono);font-size:6.5px;letter-spacing:.12em;color:#968d7d;padding-top:4px;width:62px;line-height:1.5}
.step-alg .alg{font-size:12.5px}
.step-alg.is-accent{border-left-color:var(--accent);background:rgba(255,93,56,.07)}
.step-alg.is-mint{border-left-color:#248f79;background:rgba(36,143,121,.065)}
.step-tips{display:grid;grid-template-columns:1fr 1fr;gap:10px 20px;margin:15px 0 12px}
.step-tip{display:flex;gap:8px;font-size:9.8px;line-height:1.65;color:#5a5449}
.step-tip i{font-family:var(--mono);font-size:6.5px;color:var(--accent);font-style:normal;padding-top:2px;flex:none}
.step-tip b{color:#2a2620;font-weight:600}
.step-caution{margin:13px 0 0;padding:10px 12px;background:rgba(20,18,15,.045);font-size:9.5px;line-height:1.7;color:#635c50}
.step-caution b{color:#2e2922}
.step-mini{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:rgba(20,18,15,.13);
  border:1px solid rgba(20,18,15,.13);margin:15px 0;
}
.step-mini div{background:rgba(255,255,255,.17);padding:10px 11px}
.step-mini span{display:block;font-family:var(--mono);font-size:6.5px;letter-spacing:.1em;color:#9a9182;margin-bottom:5px}
.step-mini b{display:block;font-size:10px;line-height:1.5;color:#3a352d;font-weight:500}

/* quick reference */
.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.quick-card{border:1px solid rgba(20,18,15,.15);background:rgba(255,255,255,.17);padding:15px 16px}
.quick-card header{display:flex;justify-content:space-between;gap:10px;align-items:baseline;margin-bottom:9px;padding-bottom:8px;border-bottom:1px solid var(--paper-line)}
.quick-card h4{margin:0;font-size:11.5px;font-weight:600;letter-spacing:.04em}
.quick-card header span{font-family:var(--mono);font-size:6.5px;letter-spacing:.1em;color:#998f80}
.quick-card p{margin:7px 0 0;font-size:9.2px;line-height:1.65;color:#6a6256}
.quick-card .alg{margin-top:5px;font-size:10.5px}
.quick-wide{grid-column:1/-1}
.formula-index{display:grid;grid-template-columns:repeat(2,1fr);gap:0 26px;margin-top:18px}
.formula-index-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--paper-line)}
.formula-index-row span{font-size:9.5px;color:#5b5448}
.formula-index-row code{font-family:var(--mono);font-size:8.5px;color:#1d1a15;text-align:right}

/* advanced */
.cfop-intro{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0}
.cfop-block{border:1px solid rgba(20,18,15,.15);padding:16px 17px;background:rgba(255,255,255,.16)}
.cfop-block .cfop-letter{font-family:var(--serif);font-size:35px;color:var(--accent);line-height:1;margin-bottom:8px}
.cfop-block h4{margin:0 0 6px;font-size:12px;letter-spacing:.05em}
.cfop-block p{margin:0;font-size:9.5px;line-height:1.7;color:#675f53}
.cfop-block .alg{margin-top:9px;font-size:10px}
.advanced-note{margin-top:22px;padding:16px 18px;border:1px solid rgba(20,18,15,.16);font-size:10px;line-height:1.8;color:#564f44}
.advanced-note b{color:#28231d}
.faq-list{margin-top:10px}
.faq-item{border-top:1px solid var(--paper-line);padding:16px 0}
.faq-item:first-child{border-top:0}
.faq-item h4{margin:0 0 6px;font-size:11.5px;font-weight:600;color:#2a261f}
.faq-item p{margin:0;font-size:10px;line-height:1.75;color:#625b4f}
.manual-signoff{display:flex;justify-content:space-between;align-items:flex-end;margin-top:32px;padding-top:17px;border-top:1px solid rgba(20,18,15,.16)}
.manual-signoff p{margin:0;font-family:var(--serif);font-size:12px;letter-spacing:.06em;color:#7b7364}
.manual-signoff span{font-family:var(--mono);font-size:6.5px;letter-spacing:.13em;color:#a49a8b}

/* ==========================================================================
   Help modal
   ========================================================================== */
.help-modal .help-card{
  position:relative;z-index:2;width:min(720px,calc(100vw - 48px));max-height:calc(100dvh - 56px);overflow-y:auto;
  background:var(--paper);color:var(--paper-ink);padding:34px 38px 32px;
  box-shadow:0 50px 120px -36px rgba(0,0,0,.85),0 0 0 1px rgba(255,255,255,.12);
  animation:book-in .45s var(--ease) both;
}
.help-close{
  position:absolute;right:20px;top:20px;width:32px;height:32px;border:1px solid rgba(20,18,15,.18);
  background:transparent;font-size:20px;color:#4a453d;line-height:1;display:grid;place-items:center;
}
.help-close:hover{background:#141311;color:var(--paper)}
.help-card h2{margin:8px 0 9px;font-family:var(--serif);font-size:31px;font-weight:600;letter-spacing:.01em}
.help-lede{margin:0 0 24px;max-width:50ch;font-size:11px;line-height:1.8;color:#6c6558}
.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--paper-line);border-left:1px solid var(--paper-line)}
.help-item{display:flex;gap:14px;padding:17px;border-right:1px solid var(--paper-line);border-bottom:1px solid var(--paper-line)}
.help-icon{width:40px;height:40px;flex:none;color:#3c372e;display:grid;place-items:center;border:1px solid rgba(20,18,15,.13)}
.help-icon svg{width:28px;height:28px}
.help-item h3{margin:0 0 5px;font-size:11px;letter-spacing:.05em}
.help-item p{margin:0;font-size:9.5px;line-height:1.7;color:#6f675a}
.help-tip{margin:18px 0;padding:12px 15px;border-left:2px solid var(--accent);background:rgba(255,93,56,.055);font-size:10px;line-height:1.75;color:#574f43}
.help-tip span{font-family:var(--mono);font-size:7px;letter-spacing:.1em;color:var(--accent);margin-right:7px}
.help-primary{
  width:100%;border:0;background:#191713;color:#f3eee2;padding:14px;font-size:11px;letter-spacing:.08em;
  transition:background .2s;
}
.help-primary:hover{background:var(--accent);color:#160b07}

/* ==========================================================================
   Success
   ========================================================================== */
.success-layer{
  position:fixed;inset:0;z-index:120;display:grid;place-items:center;padding:30px;
  background:rgba(3,4,7,.58);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.success-halo{
  position:absolute;left:50%;top:50%;width:min(820px,90vw);aspect-ratio:1;transform:translate(-50%,-50%);
  background:
    radial-gradient(circle,rgba(255,93,56,.16),transparent 38%),
    radial-gradient(circle at 42% 45%,rgba(94,225,195,.12),transparent 40%);
  filter:blur(12px);pointer-events:none;
}
.success-card{
  position:relative;z-index:3;width:min(520px,calc(100vw - 40px));
  background:
    radial-gradient(circle at 50% 0,rgba(255,93,56,.13),transparent 44%),
    linear-gradient(180deg,#14161d,#0b0c11);
  border:1px solid rgba(242,239,231,.16);
  padding:30px 38px 30px;text-align:center;
  box-shadow:0 50px 120px -30px rgba(0,0,0,.9),inset 0 1px rgba(255,255,255,.07);
  animation:success-in .6s var(--ease) both;
}
@keyframes success-in{from{opacity:0;transform:translateY(26px) scale(.98)}to{opacity:1;transform:none}}
.success-kicker{font-family:var(--mono);font-size:7.5px;letter-spacing:.2em;color:var(--mint)}
.success-emblem{
  width:58px;height:58px;margin:19px auto 15px;position:relative;display:grid;place-items:center;
  border:1px solid rgba(255,93,56,.42);transform:rotate(2deg);
}
.success-emblem::before,.success-emblem::after{content:"";position:absolute;background:rgba(255,93,56,.4)}
.success-emblem::before{left:-7px;right:-7px;top:50%;height:1px}
.success-emblem::after{top:-7px;bottom:-7px;left:50%;width:1px}
.success-emblem span{font-family:var(--serif);font-size:27px;color:var(--accent);background:#0d0f14;position:relative;z-index:1;padding:2px 4px}
.success-emblem i{position:absolute;inset:5px;border:1px solid rgba(255,93,56,.15)}
.success-card h2{margin:0;font-family:var(--serif);font-size:34px;font-weight:500;letter-spacing:.02em}
.success-sub{margin:7px 0 19px;font-size:10px;letter-spacing:.06em;color:var(--faint)}
.success-time{display:flex;align-items:baseline;justify-content:center;font-family:var(--mono);font-size:60px;letter-spacing:-.08em;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}
.success-time em{font-style:normal;font-size:.42em;color:var(--accent);letter-spacing:-.04em;margin-left:2px}
.success-stats{display:grid;grid-template-columns:repeat(3,1fr);margin:24px 0 12px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.success-stats>div{padding:13px 4px;display:flex;flex-direction:column;gap:4px;border-right:1px solid var(--line)}
.success-stats>div:last-child{border-right:0}
.success-stats span{font-size:8px;letter-spacing:.1em;color:var(--faint)}
.success-stats b{font-family:var(--mono);font-size:14px;font-weight:500;color:var(--ink-soft)}
.success-record-note{margin:0 0 21px;font-size:9.5px;letter-spacing:.05em;color:var(--accent);min-height:14px}
.success-actions{display:grid;grid-template-columns:1fr auto;gap:8px}
.success-actions .btn{min-height:48px}
.success-actions .btn-quiet{min-width:104px}
.confetti-field{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.confetti{position:absolute;left:50%;top:50%;width:7px;height:11px;background:var(--c);opacity:0;animation:confetti 2.5s var(--ease) forwards;animation-delay:var(--d);transform:translate(-50%,-50%) rotate(var(--r))}
@keyframes confetti{
  0%{opacity:0;transform:translate(-50%,-50%) rotate(0) scale(.5)}
  8%{opacity:1}
  100%{opacity:0;transform:translate(calc(-50% + var(--x)),calc(-50% + var(--y))) rotate(calc(var(--r) + 500deg)) scale(1)}
}

/* ==========================================================================
   Toast + boot
   ========================================================================== */
.toast{
  position:fixed;left:50%;bottom:66px;transform:translate(-50%,12px);z-index:130;
  max-width:min(420px,calc(100vw - 32px));padding:11px 16px;
  border:1px solid rgba(242,239,231,.14);background:rgba(12,14,19,.9);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  color:var(--ink-soft);font-size:10.5px;letter-spacing:.035em;line-height:1.5;text-align:center;
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s var(--ease);
  box-shadow:0 18px 50px -20px rgba(0,0,0,.7);
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast b{color:var(--accent);font-weight:600}

.boot{
  position:fixed;inset:0;z-index:200;display:grid;place-items:center;
  background:
    radial-gradient(circle at 50% 45%,rgba(31,40,61,.5),transparent 58%),
    #07080b;
  transition:opacity .7s var(--ease),visibility .7s;
}
.boot.is-done{opacity:0;visibility:hidden;pointer-events:none}
.boot-inner{width:min(360px,calc(100vw - 56px));text-align:center}
.boot-cube{
  width:48px;height:48px;margin:0 auto 24px;position:relative;transform:rotate(-10deg);
  animation:boot-float 3s ease-in-out infinite;
}
.boot-face{position:absolute;left:9px;top:10px;width:30px;height:30px;border:1px solid rgba(242,239,231,.42)}
.boot-front{transform:translate(0,4px);background:rgba(255,93,56,.12)}
.boot-top{transform:translate(5px,-4px) skewY(-28deg) scaleY(.72);transform-origin:left bottom;background:rgba(242,201,76,.12)}
.boot-right{transform:translate(10px,2px) skewY(30deg) scaleY(.72);transform-origin:left top;background:rgba(94,225,195,.1)}
@keyframes boot-float{0%,100%{transform:rotate(-10deg) translateY(0)}50%{transform:rotate(-10deg) translateY(-5px)}}
.boot-kicker{font-family:var(--mono);font-size:7.5px;letter-spacing:.22em;color:var(--faint);margin:0 0 11px}
.boot h1{margin:0 0 20px;font-family:var(--serif);font-size:22px;font-weight:500;letter-spacing:.04em;color:var(--ink-soft)}
.boot-track{height:1px;background:rgba(242,239,231,.12);overflow:hidden}
.boot-track i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--mint));transition:width .35s var(--ease)}
.boot-status{margin:10px 0 0;font-size:9px;letter-spacing:.05em;color:var(--faint)}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width:1240px){
  .workspace{grid-template-columns:clamp(286px,22vw,320px) minmax(0,1fr) clamp(294px,23vw,332px)}
  .panel-scroll{padding:28px 23px 30px}
  .panel-right .panel-scroll{padding:28px 21px}
  .hero-title{font-size:clamp(44px,4.3vw,58px)}
  .timer-display{font-size:clamp(46px,4.2vw,58px)}
  .top-instruction{font-size:10.5px;gap:10px}
  .stage-side-note{display:none}
  .method-main span{font-size:8px}
}
@media (max-width:1080px){
  .workspace{grid-template-columns:300px minmax(0,1fr)}
  .panel-right{display:none}
  .top-instruction{display:none}
  .brand{margin-right:auto}
  .manual-trigger{margin-left:0}
  .stage-bottom{left:22px;right:22px}
  .stage-hint{max-width:220px}
}
@media (max-width:820px){
  html,body{overflow:auto}
  .app{height:auto;min-height:100dvh;grid-template-rows:64px auto}
  .topbar{height:64px;padding:0 18px;position:sticky;top:0}
  .top-actions{gap:2px}
  .tool-label{display:none}
  .tool-btn{width:34px;padding:0}
  .manual-trigger{padding:0 11px;height:34px}
  .manual-trigger span{font-size:10.5px}
  .workspace{display:flex;flex-direction:column}
  .stage{order:0;height:52dvh;min-height:380px;border-bottom:1px solid var(--line)}
  .panel-left{order:1;border-right:0}
  .panel-scroll{height:auto;overflow:visible;padding:26px 22px 36px}
  .panel-left .hero-title{font-size:48px;margin-bottom:16px}
  .hero-lede{font-size:11px;margin-bottom:20px}
  .timer-display{font-size:56px}
  .primary-actions{grid-template-columns:1fr 72px}
  .left-foot{margin-top:20px}
  .statusbar{display:none}
  .stage-top{left:18px;right:18px;top:16px}
  .stage-bottom{left:18px;right:18px;bottom:14px;align-items:flex-end}
  .gesture-legend{gap:11px}
  .gesture-legend>span{font-size:8px}
  .stage-hint{display:none}
  .stage-side-note{display:none}
  .layer-indicator{top:70px}
  .modal{padding:0}
  .manual-book{width:100vw;height:100dvh;grid-template-columns:1fr;grid-template-rows:auto minmax(0,1fr)}
  .manual-nav-col{padding:14px 18px 0;background:#151516}
  .manual-brand{margin-bottom:12px}
  .manual-brand-mark{width:28px;height:28px}
  .manual-brand b{font-size:12px}
  .manual-nav{flex-direction:row;overflow-x:auto;gap:0;flex:none}
  .manual-nav button{flex:0 0 auto;grid-template-columns:14px auto;border-top:0;border-bottom:2px solid transparent;padding:9px 10px 10px 0;margin-right:9px;font-size:10px}
  .manual-nav button:last-child{border-bottom:2px solid transparent}
  .manual-nav button.active{border-bottom-color:var(--accent)}
  .manual-nav button.active::after{display:none}
  .manual-nav button em{display:none}
  .manual-nav-foot{display:none}
  .manual-page{min-height:0}
  .manual-top{padding:17px 20px 13px}
  .manual-top h2{font-size:22px}
  .manual-edition{display:none}
  .manual-content{padding:22px 20px 50px}
  .manual-section-head h3{font-size:27px}
  .step-head{grid-template-columns:34px minmax(0,1fr);gap:12px}
  .step-number{font-size:33px}
  .step-head h3{font-size:21px}
  .step-body{padding-left:46px}
  .step-tips,.quick-grid,.cfop-intro{grid-template-columns:1fr}
  .diagram-grid.two,.diagram-grid.three,.keyboard-guide,.mouse-guide{grid-template-columns:1fr}
  .keyboard-figure{border-left:0;border-top:1px solid var(--paper-line);padding-top:14px}
  .cube-net{grid-template-columns:repeat(4,56px);grid-template-rows:repeat(3,56px);gap:4px}
  .uface{grid-template-columns:repeat(3,23px);grid-template-rows:repeat(3,23px)}
  .quick-wide{grid-column:auto}
  .face-map{grid-template-columns:1fr 1fr}
  .formula-index{grid-template-columns:1fr}
  .manual-signoff{margin-top:22px}
  .help-modal{padding:14px}
  .help-card{padding:26px 20px 22px;max-height:calc(100dvh - 28px)}
  .help-card h2{font-size:26px}
  .help-grid{grid-template-columns:1fr}
  .success-card{padding:25px 20px 22px}
  .success-card h2{font-size:28px}
  .success-time{font-size:52px}
}
@media (max-width:520px){
  .brand-copy small{display:none}
  .brand-copy b{font-size:14px}
  .brand-copy b em{font-size:10px}
  .stage{height:48dvh;min-height:330px}
  .stage-top .stage-coords{display:none}
  .stage-bottom{display:block}
  .gesture-legend{gap:13px;flex-wrap:wrap}
  .desktop-only{display:none!important}
  .stage-bottom .gesture-legend span{font-size:8px}
  .panel-scroll{padding:22px 18px 34px}
  .panel-left .hero-title{font-size:42px}
  .timer-card{margin-bottom:18px}
  .timer-meta b.mono{font-size:11px}
  .record-row{grid-template-columns:22px 1fr auto;gap:6px}
  .record-date{display:none}
  .success-actions{grid-template-columns:1fr}
  .success-actions .btn-quiet{min-width:0;min-height:42px}
}

@media (max-width:640px){
  .step-body{padding-left:0}
  .step-head{grid-template-columns:38px minmax(0,1fr)}
  .manual-figure{padding:12px 10px 10px}
  .cube-net{grid-template-columns:repeat(4,52px);grid-template-rows:repeat(3,52px)}
  .diagram-flow{gap:5px}
  .uface{grid-template-columns:repeat(3,22px);grid-template-rows:repeat(3,22px)}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}

/* ==========================================================================
   2026 — quiet studio refresh
   A lighter, quieter frame: one stage, one timer, one compact control bar.
   Formula and record content live in drawers instead of permanent panels.
   ========================================================================== */

html{background:#e8e3da}
body{
  background:
    radial-gradient(1000px 700px at 50% 15%,#f8f5ef 0,#efebe3 48%,#e5dfd5 100%);
  color:#1b1a17;
}
body::before,body::after{display:none}
.app{
  --ink:#1b1a17;
  --ink-soft:#3e3b34;
  --muted:#767168;
  --faint:#a29b8f;
  --line:rgba(27,26,23,.13);
  --line-soft:rgba(27,26,23,.065);
  --accent:#a95736;
  --accent-deep:#894429;
  --mint:#587565;
  --yellow:#a77d35;
  --surface:rgba(255,255,255,.54);
  --surface-strong:rgba(255,255,255,.78);
  --ease:cubic-bezier(.22,.8,.24,1);
  position:relative;z-index:2;
  height:100dvh;min-height:0;
  display:grid;grid-template-rows:68px minmax(0,1fr);
  color:var(--ink);
  background:transparent;
}

/* top bar ---------------------------------------------------------------- */
.app .topbar{
  padding:0 28px 0 30px;
  border-bottom:1px solid var(--line);
  background:rgba(247,244,238,.72);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  gap:20px;
}
.app .brand{gap:11px;color:var(--ink)}
.app .brand-mark{width:31px;height:31px;color:var(--ink);opacity:1}
.app .brand-copy b{font-size:16px;font-weight:600;letter-spacing:.1em;color:var(--ink)}
.app .brand-copy b em{color:var(--accent);font-size:10.5px;letter-spacing:.08em;margin-left:4px}
.app .brand-copy small{font-size:7px;letter-spacing:.2em;color:var(--faint)}
.app .top-actions{gap:2px;margin-left:auto}
.app .tool-btn{
  height:38px;padding:0 11px;border:1px solid transparent;border-radius:999px;
  color:var(--muted);background:transparent;gap:7px;
}
.app .tool-btn .icon{width:16px;height:16px}
.app .tool-btn .tool-label{font-size:10.5px;letter-spacing:.08em}
.app .tool-btn:hover{color:var(--ink);background:rgba(27,26,23,.045);border-color:transparent}
.app .tool-btn[aria-pressed="false"]{color:var(--faint)}
.tool-count{
  display:inline-grid;place-items:center;min-width:17px;height:17px;padding:0 4px;
  border-radius:999px;background:rgba(27,26,23,.07);color:var(--ink-soft);
  font-family:var(--mono);font-size:8px;line-height:1;letter-spacing:0;
}
.app .tool-btn:hover .tool-count{background:rgba(27,26,23,.11)}

/* studio + stage --------------------------------------------------------- */
.app .studio{min-height:0;min-width:0;padding:14px 18px 18px;position:relative}
.app .stage{
  position:relative;height:100%;min-height:0;overflow:hidden;isolation:isolate;
  border:1px solid rgba(27,26,23,.09);border-radius:22px;
  background:
    radial-gradient(ellipse 76% 62% at 50% 38%,#fdfcfa 0%,#f5f1e9 48%,#e9e3d9 100%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.8),
    0 24px 60px -44px rgba(45,38,26,.36);
}
.app .stage::before{display:none}
.app .stage::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    radial-gradient(ellipse 54% 17% at 50% 87%,rgba(52,44,32,.09),transparent 68%),
    radial-gradient(ellipse 72% 66% at 50% 44%,transparent 56%,rgba(78,66,48,.055) 100%);
}
.app #cube-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:2;display:block;touch-action:none}

.app .stage-mark{
  position:absolute;z-index:4;right:31px;top:31px;pointer-events:none;
  text-align:right;font-family:var(--mono);font-size:7px;line-height:1.95;
  letter-spacing:.16em;color:rgba(27,26,23,.33);
}
.app .legacy-readouts{display:none!important}
.app .legacy-hooks{display:none!important}

/* timer ------------------------------------------------------------------ */
.app .session-hud{
  position:absolute;z-index:5;left:34px;top:29px;width:318px;
  pointer-events:none;border:0;margin:0;padding:0;background:none;
}
.app .hud-top{display:flex;align-items:center;justify-content:space-between;gap:14px}
.app .hud-label{font-family:var(--mono);font-size:7px;letter-spacing:.18em;color:rgba(27,26,23,.38)}
.app .state-pill{
  height:24px;padding:0 10px;border-radius:999px;gap:7px;
  border:1px solid var(--line);color:var(--muted);background:rgba(255,255,255,.32);
  font-size:9px;letter-spacing:.09em;
}
.app .state-pill i{width:4px;height:4px}
.app .state-pill[data-state="ready"]{color:var(--accent);border-color:rgba(169,87,54,.28);background:rgba(169,87,54,.05)}
.app .state-pill[data-state="running"]{color:var(--mint);border-color:rgba(88,117,101,.28);background:rgba(88,117,101,.06)}
.app .state-pill[data-state="solved"]{color:var(--ink);border-color:rgba(27,26,23,.22);background:rgba(255,255,255,.5)}
.app .state-pill[data-state="scrambling"]{color:var(--muted)}
.app .timer-display{
  margin:13px 0 3px;font-family:var(--mono);font-weight:400;
  font-size:clamp(44px,4vw,58px);line-height:.98;letter-spacing:-.075em;
  color:var(--ink);text-shadow:none;
}
.app .timer-frac{font-size:.38em;color:rgba(27,26,23,.45);margin-left:2px}
.app .timer-card.is-running .timer-frac{color:var(--mint)}
.app .timer-note{margin:0 0 13px;font-size:10px;letter-spacing:.03em;color:var(--faint);min-height:15px}
.app .timer-meta{
  display:flex;align-items:stretch;width:292px;border-top:1px solid var(--line);
}
.app .timer-meta>div{
  flex:1;display:flex;flex-direction:column;gap:5px;
  padding:10px 14px 0 0;margin-right:14px;border-right:1px solid var(--line-soft);
}
.app .timer-meta>div:last-child{border-right:0;margin-right:0;padding-right:0}
.app .timer-meta span{font-size:8px;letter-spacing:.12em;color:var(--faint)}
.app .timer-meta b{font-size:13px;line-height:1;font-weight:500;color:var(--ink-soft);font-variant-numeric:tabular-nums}
.app .timer-meta b.mono{font-size:11.5px;letter-spacing:-.02em}

/* layer feedback --------------------------------------------------------- */
.app .layer-indicator{
  top:27px;padding:8px 13px;border-radius:999px;
  border:1px solid rgba(27,26,23,.14);background:rgba(255,255,255,.72);
  color:var(--ink-soft);font-size:8px;letter-spacing:.13em;
  box-shadow:0 8px 26px -18px rgba(30,25,18,.5);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.app .layer-indicator.visible{opacity:1}
.app .layer-indicator b{font-size:9.5px;color:var(--ink)}
.app .layer-indicator span::before{background:var(--accent)}

/* bottom controls -------------------------------------------------------- */
.app .stage-ui{
  position:absolute;z-index:6;left:50%;bottom:22px;transform:translateX(-50%);
  width:min(760px,calc(100% - 48px));
  display:flex;flex-direction:column;align-items:center;gap:10px;
  pointer-events:none;
}
.app .stage-hint-text{
  margin:0;padding:0;max-width:600px;text-align:center;
  font-size:10px;line-height:1.6;letter-spacing:.035em;color:rgba(27,26,23,.52);
  text-shadow:0 1px 0 rgba(255,255,255,.55);
  transition:opacity .2s;
}
.app .control-deck{
  pointer-events:auto;display:flex;align-items:center;gap:3px;padding:5px;
  border:1px solid rgba(27,26,23,.13);border-radius:999px;
  background:rgba(252,250,246,.76);
  -webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);
  box-shadow:
    0 18px 44px -28px rgba(40,34,24,.5),
    inset 0 1px 0 rgba(255,255,255,.9);
}
.app .deck-btn{
  height:42px;padding:0 17px;border:1px solid transparent;border-radius:999px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--ink-soft);
  font-size:11px;letter-spacing:.06em;white-space:nowrap;
  transition:background .18s,color .18s,transform .18s,border-color .18s;
}
.app .deck-btn svg{width:15px;height:15px;flex:none;opacity:.8}
.app .deck-btn:hover{background:rgba(27,26,23,.055);color:var(--ink)}
.app .deck-btn:active{transform:translateY(1px)}
.app .deck-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}
.app .deck-btn-primary{
  background:var(--ink);border-color:var(--ink);color:#f8f5ee;padding:0 20px;
  box-shadow:0 10px 22px -16px rgba(20,18,14,.8);
}
.app .deck-btn-primary:hover{background:#34322c;border-color:#34322c;color:#fff}
.app .deck-btn-primary svg{opacity:.9}
.app .deck-btn-quiet{color:var(--ink);padding-left:15px}
.app .deck-arrow{
  font-style:normal;font-size:12px;color:var(--faint);margin-left:1px;
  transition:transform .2s,color .2s;
}
.app .deck-btn-quiet:hover .deck-arrow{color:var(--accent);transform:translate(2px,-2px)}
.app .deck-divider{width:1px;height:20px;background:var(--line);margin:0 3px;flex:none}

/* records drawer --------------------------------------------------------- */
.records-modal{padding:0;justify-content:flex-end;align-items:stretch}
.records-modal .modal-backdrop{
  background:rgba(28,24,18,.28);
  -webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px);
}
.records-modal .modal-backdrop::after{display:none}
.records-sheet{
  position:relative;z-index:2;width:min(432px,100vw);height:100dvh;
  display:flex;flex-direction:column;min-height:0;
  padding:33px 30px 26px;background:#f7f4ee;color:#1b1a17;
  border-left:1px solid rgba(27,26,23,.1);
  box-shadow:-38px 0 90px -46px rgba(35,28,20,.5);
  animation:sheet-in .38s var(--ease) both;
}
@keyframes sheet-in{from{opacity:0;transform:translateX(18px)}to{opacity:1;transform:none}}
.records-sheet-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.records-sheet-head h2{
  margin:8px 0 0;font-family:var(--serif);font-size:31px;font-weight:600;
  letter-spacing:.01em;color:#1b1a17;
}
.records-sheet-head .eyebrow{color:#9b9488}
.sheet-close{
  width:34px;height:34px;border:1px solid rgba(27,26,23,.16);border-radius:50%;
  background:transparent;color:#4a463f;font-size:20px;line-height:1;
  display:grid;place-items:center;transition:background .18s,color .18s;
}
.sheet-close:hover{background:#1b1a17;color:#f7f4ee}
.records-summary{
  display:grid;grid-template-columns:1fr 1fr;margin:26px 0 18px;
  border-top:1px solid rgba(27,26,23,.14);border-bottom:1px solid rgba(27,26,23,.14);
}
.records-summary>div{padding:14px 0 15px;display:flex;flex-direction:column;gap:6px}
.records-summary>div+div{padding-left:18px;border-left:1px solid rgba(27,26,23,.1)}
.records-summary span{font-size:8px;letter-spacing:.13em;color:#9b9488}
.records-summary b{font-family:var(--mono);font-size:18px;font-weight:400;letter-spacing:-.03em;color:#1b1a17}
.records-list-wrap{flex:1;min-height:0;overflow-y:auto;padding-right:4px;overscroll-behavior:contain}
.records-sheet .record-list{max-height:none;overflow:visible;padding-right:0}
.records-sheet .record-row{
  grid-template-columns:24px 1fr auto auto;gap:9px;padding:13px 0;
  border-bottom:1px solid rgba(27,26,23,.08);
  font-size:10px;color:#777168;
}
.records-sheet .record-row.is-best{color:#1b1a17}
.records-sheet .record-rank{font-size:7.5px;color:#aaa295}
.records-sheet .record-row.is-best .record-rank{color:#a95736}
.records-sheet .record-time{font-size:13px;color:#2d2a25;font-weight:400}
.records-sheet .record-row.is-best .record-time{color:#a95736}
.records-sheet .record-meta{font-size:7.5px;color:#9b9488}
.records-sheet .record-date{font-size:7.5px;color:#aaa295}
.records-sheet .best-chip{border-color:rgba(169,87,54,.3);color:#a95736;font-size:6px}
.records-sheet .record-empty{
  min-height:80px;padding:18px;border:1px dashed rgba(27,26,23,.14);
  color:#9b9488;background:rgba(27,26,23,.018);font-size:10px;line-height:1.7;
}
.records-sheet-foot{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding-top:16px;border-top:1px solid rgba(27,26,23,.09);
}
.records-sheet-foot .text-btn{color:#8a8377;border-bottom-color:transparent}
.records-sheet-foot .text-btn:hover{color:#1b1a17;border-bottom-color:#1b1a17}
.records-sheet-foot>span{font-family:var(--mono);font-size:7px;letter-spacing:.1em;color:#b3ab9f}
body.modal-open{overflow:hidden!important}

/* modal accent tuning ---------------------------------------------------- */
.manual-book{--accent:#a95736;--mint:#557162}
.help-card{--accent:#a95736;--mint:#557162}
.success-card{--accent:#d0815d;--mint:#85a798}
.manual-nav-col::after{display:none}
.manual-page::before{display:none}
.manual-book{box-shadow:0 50px 120px -38px rgba(28,22,16,.55),0 0 0 1px rgba(255,255,255,.24)}
.manual-brand-mark{border-color:rgba(169,87,54,.45);color:#d1815d}
.manual-nav button.active span:first-child{color:#d1815d}
.manual-nav button span:first-child{color:rgba(209,129,93,.45)}
.manual-step .step-number{color:#a95736}
.help-card{box-shadow:0 50px 120px -38px rgba(28,22,16,.55),0 0 0 1px rgba(255,255,255,.24)}
.help-tip{border-left-color:#a95736;background:rgba(169,87,54,.055)}
.help-tip span{color:#a95736}
.help-primary:hover{background:#a95736;color:#f7f4ee}
.success-layer{background:rgba(24,21,17,.46);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.success-card{background:linear-gradient(180deg,#1d1d1b,#121210);border-color:rgba(246,242,234,.14)}
.success-card h2{font-size:36px;letter-spacing:.01em}
.success-emblem{border-color:rgba(208,129,93,.42)}
.success-emblem::before,.success-emblem::after{background:rgba(208,129,93,.32)}
.success-emblem span{background:#171715;color:#d0815d}
.success-emblem i{border-color:rgba(208,129,93,.12)}
.success-time em{color:#d0815d}
.success-record-note{color:#d0815d}
.btn-primary{background:#f0ebe1;border-color:#f0ebe1;color:#1b1a17;box-shadow:none}
.btn-primary:hover{background:#fffaf0;border-color:#fffaf0}
.btn-primary .btn-icon{background:rgba(27,26,23,.07);border-color:rgba(27,26,23,.1)}
.btn-quiet{border-color:rgba(246,242,234,.16);color:#b8b2a6}
.btn-quiet:hover{border-color:rgba(246,242,234,.32);color:#f6f2ea;background:rgba(255,255,255,.03)}
.success-actions .btn-copy small{color:rgba(27,26,23,.5);opacity:1}

/* boot: quieter, lighter ------------------------------------------------- */
.boot{background:radial-gradient(circle at 50% 42%,#fbf8f2 0,#efebe3 58%,#e6e0d6 100%)}
.boot-cube{opacity:.9}
.boot-face{border-color:rgba(27,26,23,.4)}
.boot-front{background:rgba(169,87,54,.1)}
.boot-top{background:rgba(167,125,53,.1)}
.boot-right{background:rgba(85,113,98,.1)}
.boot-kicker{color:#a29b8f}
.boot h1{color:#1b1a17;font-size:23px}
.boot-track{background:rgba(27,26,23,.12)}
.boot-track i{background:linear-gradient(90deg,#a95736,#557162)}
.boot-status{color:#8a8377}
.toast{
  border-color:rgba(27,26,23,.12);background:rgba(255,252,246,.94);
  color:#3e3b34;box-shadow:0 18px 50px -24px rgba(40,34,24,.45);
}
.toast b{color:#a95736}
body.modal-open .app .stage{filter:saturate(.94)}

/* responsive ------------------------------------------------------------- */
@media (max-width:1080px){
  .app .topbar{padding:0 22px}
  .app .studio{padding:12px 14px 14px}
  .app .stage{border-radius:19px}
  .app .session-hud{left:27px;top:25px;width:290px}
  .app .timer-display{font-size:52px}
  .app .timer-meta{width:268px}
  .app .stage-mark{right:25px;top:26px}
}
@media (max-width:820px){
  .app{height:100dvh;min-height:0;grid-template-rows:60px minmax(0,1fr)}
  .app .topbar{height:60px;padding:0 16px;position:relative;top:auto}
  .app .brand-mark{width:27px;height:27px}
  .app .brand-copy b{font-size:14px}
  .app .brand-copy small{font-size:6px;letter-spacing:.14em}
  .app .top-actions{gap:0}
  .app .tool-btn{height:34px;padding:0 8px}
  .app .tool-label{display:none}
  .app .tool-count{font-size:7.5px;min-width:15px;height:15px}
  .app .studio{padding:8px 8px 10px}
  .app .stage{border-radius:15px}
  .app .stage-mark{display:none}
  .app .session-hud{left:19px;top:17px;width:248px}
  .app .hud-label{display:none}
  .app .timer-display{font-size:45px;margin-top:10px}
  .app .timer-note{font-size:9px;margin-bottom:10px;min-height:0}
  .app .timer-meta{width:232px}
  .app .timer-meta>div{padding-top:8px;margin-right:10px}
  .app .timer-meta b{font-size:12px}
  .app .timer-meta b.mono{font-size:10.5px}
  .app .stage-ui{bottom:14px;width:calc(100% - 28px);gap:7px}
  .app .stage-hint-text{font-size:9px;max-width:330px}
  .app .control-deck{padding:4px}
  .app .deck-btn{height:39px;padding:0 12px;font-size:10.5px;gap:6px}
  .app .deck-btn-primary{padding:0 14px}
  .app .deck-btn svg{width:14px;height:14px}
  .app .deck-arrow{display:none}
  .app .layer-indicator{top:17px;padding:6px 11px}
  .app .layer-indicator span{display:none}
  .app .layer-indicator b{min-width:0;font-size:9px}
  .records-sheet{width:min(390px,100vw);padding:26px 22px 22px}
  .records-sheet-head h2{font-size:27px}
  .records-summary{margin-top:22px}
}
@media (max-width:540px){
  .app .brand-copy small{display:none}
  .app .brand-copy b{font-size:13px}
  .app .brand-copy b em{font-size:9px}
  .app .topbar{padding:0 11px;gap:6px}
  .app .tool-btn{padding:0 7px}
  .app .studio{padding:6px 6px 8px}
  .app .stage{border-radius:13px}
  .app .session-hud{left:16px;top:15px;width:206px}
  .app .timer-display{font-size:40px;letter-spacing:-.08em}
  .app .timer-note{display:none}
  .app .timer-meta{width:198px;margin-top:2px}
  .app .timer-meta>div{padding-top:7px;margin-right:8px}
  .app .timer-meta span{font-size:7px;letter-spacing:.08em}
  .app .timer-meta b{font-size:11px}
  .app .timer-meta b.mono{font-size:9.5px}
  .app .state-pill{height:22px;padding:0 8px;font-size:8px}
  .app .stage-hint-text{display:none}
  .app .stage-ui{bottom:11px;width:calc(100% - 20px)}
  .app .control-deck{width:100%;justify-content:space-between;gap:1px;padding:4px}
  .app .deck-btn{height:38px;padding:0 8px;font-size:10px;gap:5px}
  .app .deck-btn svg{width:13px;height:13px}
  .app .deck-btn-primary{padding:0 11px}
  .app .deck-divider{margin:0 1px}
  .app .layer-indicator{top:14px;padding:5px 9px}
  .manual-nav{flex-wrap:wrap;overflow:visible;gap:0}
  .manual-nav button{flex:1 0 33.333%;grid-template-columns:15px minmax(0,1fr);margin-right:0;padding:8px 4px 9px 0;font-size:9.5px}
  .manual-nav button em{display:none}
  .records-sheet{width:100vw;padding:24px 20px 20px}
}
@media (max-height:820px) and (min-width:541px){
  .app .stage-hint-text{display:none}
}
@media (max-height:720px) and (min-width:541px){
  .app .session-hud{top:20px}
  .app .timer-display{font-size:42px;margin-top:9px}
  .app .timer-note{margin-bottom:9px}
  .app .timer-meta>div{padding-top:8px}
  .app .stage-hint-text{display:none}
  .app .stage-ui{bottom:14px}
  .app .layer-indicator{top:20px}
}
@media (max-height:620px){
  .app .timer-note{display:none}
  .app .session-hud{top:17px}
  .app .timer-display{font-size:38px}
  .app .timer-meta{width:220px}
}
@media (orientation:portrait) and (max-width:540px){
  .app .tool-count{display:none}
}