/* ================================
   在线魔方 - 自定义样式
   ================================ */
:root{--bg:#FAFAF9;--bg-alt:#F5F5F4;--surface:#FFFFFF;--border:#E7E5E4;--border-strong:#D6D3D1;--text:#1E293B;--text-secondary:#52525B;--text-muted:#71717A;--primary:#4F46E5;--primary-hover:#4338CA;--primary-light:rgba(79,70,229,.08);--secondary:#F97316;--accent:#EC4899;--success:#059669;--radius:10px;--radius-lg:14px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans SC',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}
.toast{position:fixed;top:24px;right:24px;background:var(--text);color:var(--bg);padding:10px 18px;border-radius:100px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px;z-index:1000;transform:translateX(calc(100% + 40px));transition:transform .3s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 16px rgba(0,0,0,.12)}
.toast.show{transform:translateX(0)}.toast-dot{width:8px;height:8px;background:var(--success);border-radius:50%}
.page{max-width:960px;margin:0 auto;padding:0 32px}
.tool-section{padding:32px 0 24px}
.tool-wrapper{display:flex;flex-direction:column;align-items:center;gap:24px}
.cube-scene{width:300px;height:300px;perspective:1000px;margin:0 auto}
.cube{width:200px;height:200px;position:relative;margin:50px auto;transform-style:preserve-3d;transition:transform .5s ease}
.cube-face{position:absolute;width:200px;height:200px;border:2px solid #333;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr)}
.cube-face div{border:1px solid rgba(0,0,0,.15)}
.face-front{transform:translateZ(100px)}.face-back{transform:rotateY(180deg) translateZ(100px)}
.face-right{transform:rotateY(90deg) translateZ(100px)}.face-left{transform:rotateY(-90deg) translateZ(100px)}
.face-top{transform:rotateX(90deg) translateZ(100px)}.face-bottom{transform:rotateX(-90deg) translateZ(100px)}
.cube-controls{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px}
.cube-btn{padding:10px 20px;border-radius:100px;font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;background:var(--bg-alt);color:var(--text-secondary);border:1px solid var(--border);transition:all .15s ease}
.cube-btn:hover{background:var(--primary-light);border-color:rgba(79,70,229,.25);color:var(--primary)}
.cube-btn--accent{background:linear-gradient(135deg,#D946EF 0%,#EC4899 100%);color:#fff;border:none;box-shadow:0 4px 12px rgba(217,70,239,.3)}
.cube-btn--accent:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(217,70,239,.4)}
.cube-info{display:flex;align-items:center;gap:16px;font-size:14px;color:var(--text-muted)}
.cube-info span{font-weight:600;color:var(--text);font-size:20px}
.cube-view{display:flex;gap:6px;align-items:center}
.cube-view button{padding:6px 12px;border:1px solid var(--border);border-radius:6px;background:transparent;font-size:12px;cursor:pointer;color:var(--text-muted)}
.cube-view button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.guide-section{margin-top:16px;margin-bottom:64px;background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.guide-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:14px 20px;background:none;border:none;cursor:pointer;transition:background .15s ease}
.guide-toggle:hover{background:var(--bg-alt)}
.guide-toggle-title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#1E293B}
.guide-toggle.open .toggle-arrow{transform:rotate(180deg)}
.toggle-arrow{transition:transform .2s ease;color:var(--text-muted)}
.guide-list{padding:0 20px 20px}.guide-list.hidden{display:none}
.guide-item{padding:16px 0;border-top:1px solid var(--border)}
.guide-item-title{font-size:14px;font-weight:600;color:#1E293B;margin-bottom:6px}
.guide-item-body{font-size:13px;color:var(--text-secondary);line-height:1.8}
::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#A5B4FC;border-radius:4px}
::selection{background:rgba(79,70,229,.2);color:#1E293B}
@media(max-width:768px){.page{padding:0 16px}.cube-scene{width:220px;height:220px}.cube{width:150px;height:150px}.cube-face{width:150px;height:150px}.face-front{transform:translateZ(75px)}.face-back{transform:rotateY(180deg) translateZ(75px)}.face-right{transform:rotateY(90deg) translateZ(75px)}.face-left{transform:rotateY(-90deg) translateZ(75px)}.face-top{transform:rotateX(90deg) translateZ(75px)}.face-bottom{transform:rotateX(-90deg) translateZ(75px)}.cube-controls{gap:6px}.cube-btn{padding:8px 14px;font-size:12px}}