:root{
  --chrome:#14171b;
  --chrome2:#20252b;
  --chrome3:#2a3037;
  --paper:#fff;
  --accent:#d8232a;
  --text-soft:#cfd5dc;
}
*{box-sizing:border-box} html,body{height:100%;margin:0}
body{font-family:Arial,Helvetica,sans-serif;background:#24292f;color:#fff;overflow:hidden}
button,input{font:inherit} button{cursor:pointer}
.app{height:100%;display:grid;grid-template-rows:46px 1fr 56px;min-height:0}
.topbar,.toolbar{background:var(--chrome);display:flex;align-items:center;padding:0 16px;gap:10px;z-index:20}
.topbar{justify-content:space-between;border-bottom:1px solid rgba(255,255,255,.07);box-shadow:0 2px 10px rgba(0,0,0,.16)}
.topbar::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:linear-gradient(to right,var(--accent),rgba(216,35,42,.34) 38%,rgba(216,35,42,0) 78%);pointer-events:none}
.topbar{position:relative}
.brand{font-weight:700;letter-spacing:.1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.version{font-weight:400;opacity:.55;font-size:.92em}
.status{font-variant-numeric:tabular-nums;color:#eef1f4;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.08);border-radius:999px;padding:5px 10px;font-size:13px;white-space:nowrap}
.viewer{position:relative;min-height:0;display:flex;align-items:center;justify-content:center;padding:16px 58px;background:radial-gradient(circle at 50% 40%,#444b54 0,#343a42 48%,#292e34 78%,#252a30 100%);overflow:hidden}
.viewer::before{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(to bottom,rgba(255,255,255,.025),rgba(255,255,255,0) 24%,rgba(0,0,0,.05) 100%)}
.book{position:relative;display:grid;grid-template-columns:var(--page-w,300px) var(--gutter,0px) var(--page-w,300px);grid-template-rows:var(--page-h,426px);align-items:center;max-width:100%;max-height:100%;transform-origin:center center;transition:transform .18s ease;z-index:2;isolation:isolate}
.book::before{content:"";position:absolute;left:2px;right:2px;top:2px;bottom:-4px;background:transparent;border-radius:6px;z-index:0;box-shadow:0 12px 24px rgba(0,0,0,.24);pointer-events:none}
.book::after{content:"";position:absolute;left:6px;right:6px;bottom:-4px;height:4px;z-index:1;pointer-events:none;background:repeating-linear-gradient(to bottom,#f6f6f3 0,#f6f6f3 1px,#ddddda 1px,#ddddda 2px);border-radius:0 0 6px 6px;opacity:.82}
.page-slot{position:relative;background:#fff;overflow:hidden;width:var(--page-w,300px);height:var(--page-h,426px);z-index:2;outline:1px solid rgba(0,0,0,.24);outline-offset:-1px}
.page-slot.left{grid-column:1;border-radius:6px 0 0 6px;box-shadow:-16px 19px 34px -16px rgba(0,0,0,.50),0 4px 12px rgba(0,0,0,.10)}
.page-slot.left::before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;z-index:3;pointer-events:none;background:linear-gradient(to right,rgba(0,0,0,.10),rgba(0,0,0,0))}
.page-slot.right{grid-column:3;border-radius:0 6px 6px 0;box-shadow:16px 19px 34px -16px rgba(0,0,0,.50),0 4px 12px rgba(0,0,0,.10)}
.page-slot.right::before{content:"";position:absolute;right:0;top:0;bottom:0;width:7px;z-index:3;pointer-events:none;background:linear-gradient(to left,rgba(0,0,0,.10),rgba(0,0,0,0))}
.page-slot img{display:block;width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-drag:none}
.page-slot.empty{visibility:hidden;box-shadow:none}
.spine{grid-column:2;position:relative;width:0;height:97%;z-index:5;background:transparent;box-shadow:none;justify-self:center;overflow:visible}.spine::before{display:none}
.curl-canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;display:none;z-index:30;overflow:visible}.curl-canvas.active{display:block}
.edge{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:74px;border:1px solid rgba(255,255,255,.10);border-radius:22px;background:rgba(16,19,23,.48);color:#fff;font-size:38px;line-height:1;opacity:.78;z-index:15;box-shadow:0 6px 18px rgba(0,0,0,.18);transition:background .15s ease,opacity .15s ease,transform .15s ease}
.edge:hover{background:rgba(25,29,34,.76);opacity:1}.edge:active{transform:translateY(-50%) scale(.96)}.edge-left{left:14px}.edge-right{right:14px}
.toolbar{justify-content:center;border-top:1px solid rgba(255,255,255,.07);flex-wrap:nowrap;box-shadow:0 -2px 10px rgba(0,0,0,.14)}
.toolbar button{border:1px solid rgba(255,255,255,.11);background:var(--chrome2);color:#f4f6f8;border-radius:8px;padding:7px 11px;min-height:34px;box-shadow:inset 0 1px 0 rgba(255,255,255,.03);transition:background .14s ease,border-color .14s ease,transform .08s ease}
.toolbar button:hover{background:var(--chrome3);border-color:rgba(255,255,255,.18)}.toolbar button:active{transform:translateY(1px)}.toolbar button:disabled{opacity:.30;cursor:default;transform:none}
.jump{display:flex;align-items:center;gap:7px;color:var(--text-soft);background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.07);border-radius:9px;padding:3px 7px}
.jump input{width:58px;border:1px solid #5d646d;border-radius:6px;background:#f7f8fa;color:#111;padding:5px;text-align:center;outline:none}.jump input:focus{border-color:#8e969f;box-shadow:0 0 0 2px rgba(255,255,255,.08)}
.sep{width:1px;height:28px;background:rgba(255,255,255,.10);margin:0 4px}
.single{grid-template-columns:0 0 var(--page-w,300px)}.single .left,.single .spine{display:none}.single .right{grid-column:3;display:block}
.spine-overlay{position:absolute;top:1%;bottom:1%;left:50%;width:24px;transform:translateX(-50%);pointer-events:none;z-index:45;background:linear-gradient(to right,rgba(0,0,0,0),rgba(0,0,0,.045) 24%,rgba(0,0,0,.16) 50%,rgba(0,0,0,.045) 76%,rgba(0,0,0,0))}.spine-overlay::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;transform:translateX(-50%);background:rgba(0,0,0,.13)}
@media (max-width:760px){.app{grid-template-rows:44px 1fr 58px}.viewer{padding:10px 40px}.edge{width:34px;height:64px;font-size:32px;border-radius:17px}.edge-left{left:4px}.edge-right{right:4px}.brand{font-size:14px}.version{display:none}.status{font-size:12px;padding:4px 8px}.toolbar{padding:0 6px;gap:5px;overflow-x:auto;justify-content:flex-start}.toolbar button{padding:6px 8px}#modeBtn{display:none}.jump{padding:2px 5px}}

.page-slot::after{content:"";position:absolute;left:0;right:0;top:0;height:2px;z-index:4;pointer-events:none;background:linear-gradient(to bottom,rgba(255,255,255,.82),rgba(255,255,255,0))}
.single::before{left:1px;right:1px}
.single::after{left:4px;right:4px}


/* 0.34: Erste/letzte Einzelseite in Doppelseiten-Ansicht mittig darstellen */
.book.edge-only{grid-template-columns:var(--page-w,300px);justify-content:center}
.book.edge-only .spine,.book.edge-only .spine-overlay{display:none}
.book.edge-only.edge-start .left{display:none}
.book.edge-only.edge-start .right{grid-column:1;display:block}
.book.edge-only.edge-end .right{display:none}
.book.edge-only.edge-end .left{grid-column:1;display:block}
.book.edge-only::before{left:1px;right:1px;top:2px;bottom:-4px;border-radius:6px}
.book.edge-only::after{left:4px;right:4px;bottom:-4px;height:4px;border-radius:0 0 6px 6px}