#usageGuideOverlay{position:fixed;inset:0;z-index:100000;display:none;flex-direction:column;
background:radial-gradient(circle at 50% 0%, rgba(30,27,75,0.98) 0%, rgba(15,23,42,0.99) 60%, rgba(7,11,25,0.995) 100%);
backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
opacity:0;transition:opacity .32s cubic-bezier(0.25,1,0.5,1);overflow:hidden;}
#usageGuideOverlay.ug-visible{opacity:1;}
.ug-ambient{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:0;}
.ug-ambient::before{content:"";position:absolute;inset:0;
background:radial-gradient(circle at 20% 15%, rgba(0,240,255,0.10) 0%, transparent 42%),
radial-gradient(circle at 82% 78%, rgba(192,132,252,0.10) 0%, transparent 45%);}
.ug-spark{position:absolute;bottom:-12px;border-radius:50%;pointer-events:none;opacity:0;
animation:ugFloat linear infinite;}
@keyframes ugFloat{0%{transform:translateY(0) scale(.5);opacity:0;}15%{opacity:.85;}85%{opacity:.5;}100%{transform:translateY(-102vh) scale(1);opacity:0;}}
.ug-header{position:relative;z-index:2;flex-shrink:0;display:flex;align-items:center;gap:12px;
padding:18px 18px 16px 18px;border-bottom:1px solid rgba(0,240,255,0.22);
background:linear-gradient(180deg, rgba(7,11,25,0.55) 0%, rgba(7,11,25,0) 100%);}
.ug-header-icon{width:40px;height:40px;flex-shrink:0;border-radius:12px;display:flex;align-items:center;justify-content:center;
background:linear-gradient(135deg, rgba(0,240,255,0.22), rgba(192,132,252,0.22));
border:1px solid rgba(0,240,255,0.4);box-shadow:0 0 14px rgba(0,240,255,0.3);color:var(--cosmic-cyan);}
.ug-header-titles{flex:1;min-width:0;}
.ug-header-title{font-family:"Noto Serif JP",serif;font-size:19px;font-weight:900;color:#fff;letter-spacing:1px;
text-shadow:0 0 12px rgba(0,240,255,0.45);line-height:1.2;}
.ug-header-sub{font-size:10.5px;font-weight:700;color:var(--cosmic-purple-light);letter-spacing:1.5px;margin-top:3px;
text-shadow:0 0 8px rgba(192,132,252,0.4);}
.ug-close{width:38px;height:38px;flex-shrink:0;border-radius:10px;border:1px solid rgba(255,255,255,0.22);
background:rgba(255,255,255,0.05);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;
transition:all .2s ease;-webkit-tap-highlight-color:transparent;}
.ug-close:active{transform:scale(0.9);background:rgba(239,68,68,0.18);border-color:#EF4444;color:#FCA5A5;}
.ug-body{position:relative;z-index:2;flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;
padding:20px 18px calc(28px + env(safe-area-inset-bottom)) 18px;}
.ug-body::-webkit-scrollbar{width:4px;}
.ug-body::-webkit-scrollbar-thumb{background:rgba(0,240,255,0.3);border-radius:2px;}
.ug-section-title{font-family:"Noto Serif JP",serif;font-size:15px;font-weight:900;color:#fff;
letter-spacing:1px;margin:26px 0 12px 0;display:flex;align-items:center;gap:8px;
text-shadow:0 0 10px rgba(0,240,255,0.35);}
.ug-section-title:first-child{margin-top:4px;}
.ug-section-title::after{content:"";flex:1;height:1px;
background:linear-gradient(90deg, rgba(0,240,255,0.5), transparent);}
.ug-steps{display:flex;flex-direction:column;gap:10px;}
.ug-step{display:flex;gap:12px;align-items:flex-start;padding:13px 14px;border-radius:14px;
background:linear-gradient(135deg, rgba(0,240,255,0.06), rgba(192,132,252,0.05));
border:1px solid rgba(255,255,255,0.12);box-shadow:0 4px 14px rgba(0,0,0,0.25);}
.ug-step-num{width:30px;height:30px;flex-shrink:0;border-radius:50%;display:flex;align-items:center;justify-content:center;
font-family:"Noto Serif JP",serif;font-size:15px;font-weight:900;color:#06121f;
background:linear-gradient(135deg, var(--cosmic-cyan), var(--cosmic-purple-light));
box-shadow:0 0 12px rgba(0,240,255,0.5);}
.ug-step-body{flex:1;min-width:0;}
.ug-step-head{font-size:13.5px;font-weight:800;color:#fff;margin-bottom:3px;display:flex;align-items:center;gap:6px;}
.ug-step-head i{color:var(--cosmic-cyan);flex-shrink:0;}
.ug-step-desc{font-size:11.5px;color:rgba(226,232,240,0.82);line-height:1.6;font-weight:500;}
.ug-acc{border-radius:13px;margin-bottom:9px;overflow:hidden;
border:1px solid rgba(255,255,255,0.12);background:rgba(255,255,255,0.035);
transition:border-color .25s ease, box-shadow .25s ease;}
.ug-acc.open{border-color:rgba(0,240,255,0.4);box-shadow:0 0 14px rgba(0,240,255,0.16);}
.ug-acc-head{width:100%;display:flex;align-items:center;gap:10px;padding:13px 14px;
background:none;border:none;cursor:pointer;text-align:left;color:#fff;
-webkit-tap-highlight-color:transparent;transition:background .2s ease;}
.ug-acc-head:active{background:rgba(0,240,255,0.07);}
.ug-acc-ico{width:30px;height:30px;flex-shrink:0;border-radius:9px;display:flex;align-items:center;justify-content:center;
background:rgba(0,240,255,0.12);border:1px solid rgba(0,240,255,0.3);color:var(--cosmic-cyan);}
.ug-acc-title{flex:1;min-width:0;font-size:13px;font-weight:800;color:#fff;letter-spacing:0.3px;}
.ug-chev{flex-shrink:0;color:var(--text-sub);transition:transform .3s cubic-bezier(0.25,1,0.5,1);}
.ug-acc.open .ug-chev{transform:rotate(180deg);color:var(--cosmic-cyan);}
.ug-acc-body{max-height:0;overflow:hidden;box-sizing:border-box;padding:0 16px;
transition:max-height .38s cubic-bezier(0.25,1,0.5,1);}
.ug-acc.open .ug-acc-body{padding:2px 16px 15px 16px;}
.ug-acc-body p{font-size:12px;color:rgba(226,232,240,0.86);line-height:1.75;margin:0 0 9px 0;font-weight:500;}
.ug-acc-body p:last-child{margin-bottom:0;}
.ug-acc-body strong{color:var(--cosmic-cyan);font-weight:800;}
.ug-acc-body em{color:var(--cosmic-purple-light);font-style:normal;font-weight:800;}
.ug-acc-body ul{margin:0 0 9px 0;padding:0;list-style:none;}
.ug-acc-body li{position:relative;padding:5px 0 5px 18px;font-size:11.5px;color:rgba(226,232,240,0.84);line-height:1.6;}
.ug-acc-body li::before{content:"";position:absolute;left:2px;top:11px;width:6px;height:6px;border-radius:50%;
background:var(--cosmic-cyan);box-shadow:0 0 7px rgba(0,240,255,0.7);}
.ug-marks{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 4px 0;}
.ug-mark{display:inline-flex;align-items:center;gap:5px;font-size:10.5px;font-weight:700;
padding:3px 9px;border-radius:20px;border:1px solid rgba(255,255,255,0.18);background:rgba(0,0,0,0.25);}
.ug-mark b{width:13px;height:13px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:8px;font-weight:900;}
.ug-tips{display:flex;flex-direction:column;gap:8px;}
.ug-tip{display:flex;gap:10px;align-items:flex-start;padding:11px 13px;border-radius:12px;
background:rgba(245,158,11,0.06);border:1px solid rgba(245,158,11,0.22);}
.ug-tip-ico{flex-shrink:0;color:#FBBF24;margin-top:1px;filter:drop-shadow(0 0 5px rgba(245,158,11,0.5));}
.ug-tip-text{font-size:11.5px;color:rgba(254,243,199,0.92);line-height:1.65;font-weight:600;}
#usageGuideEntryBtn{color:var(--cosmic-cyan) !important;}
#usageGuideEntryBtn i{color:var(--cosmic-cyan);filter:drop-shadow(0 0 5px rgba(0,240,255,0.5));}
#usageGuideEntryBtn:active{background:rgba(0,240,255,0.12) !important;}