/* Matte binder models: solid covers, visible spines and actual stored paper only. */
.revision-intro{color:var(--muted);line-height:1.6;font-size:14px}.binder-shelf{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px;padding:42px 8px 16px}.binder-pick{background:none;text-align:left;padding:0;min-width:0;perspective:1100px}.binder-ses{--cover:#ba6658;--edge:#743e37;--cover-ink:#fff3e8}.binder-maths{--cover:#728ccc;--edge:#455982;--cover-ink:#f6f4ff}.binder-svt{--cover:#65a58b;--edge:#3a6655;--cover-ink:#f0fff6}.binder-object{position:relative;display:block;aspect-ratio:1/1.16;transform:rotateY(-17deg) rotateZ(-4deg);transform-style:preserve-3d;transition:transform .25s}.binder-pick:hover .binder-object,.binder-pick:focus-visible .binder-object{transform:rotateY(-8deg) rotateZ(-1deg) translateY(-6px)}.binder-back{position:absolute;inset:0;background:var(--edge);border-radius:4px 8px 8px 4px;transform:translate3d(10px,-5px,-13px)}.binder-paper-edge{position:absolute;inset:6px -6px 6px 18px;background:#e0dbc9;border-right:3px double #aaa692;transform:translateZ(-5px)}.binder-cover{position:absolute;inset:0;background:var(--cover);border:1px solid var(--edge);border-right:4px solid var(--edge);border-bottom:6px solid var(--edge);border-radius:4px 9px 9px 4px;color:var(--cover-ink);overflow:hidden}.binder-spine{position:absolute;inset:0 auto 0 0;width:20px;background:var(--edge);border-right:1px solid #0002}.binder-spine i{position:absolute;left:7px;top:15%;width:6px;height:8px;background:#c2c7ca;border:1px solid #6f7b7e;border-radius:50%}.binder-spine i+i{top:79%}.cover-label{position:absolute;left:35px;right:10px;top:15%;display:grid;gap:9px}.cover-label>span:first-child{font-size:8px;letter-spacing:1.6px}.cover-label strong{font-size:clamp(23px,3vw,36px);letter-spacing:-1px}.cover-icon{margin-top:15px}.cover-icon svg{width:38px;height:38px;stroke-width:1.4}.cover-bottom{position:absolute;bottom:17px;left:35px;font-size:7px;letter-spacing:1px}.binder-caption{display:flex;justify-content:space-between;gap:8px;margin:24px 0 0;align-items:center;font-size:13px}.binder-caption>span{color:var(--muted);font-size:11px}.revision-hint{font-size:13px;line-height:1.6;color:var(--muted);text-align:center;margin:30px 0}.revision-tools{border-top:1px solid var(--line);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px}.revision-tools .text-button{font-size:12px}.binder-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 0 25px}.binder-toolbar .text-button{margin:0;font-size:13px;min-height:44px}.binder-toolbar>span{font-weight:700}.binder-open{--hinge:50%;position:relative;display:grid;grid-template-columns:var(--hinge) 1fr;min-height:390px;border:5px solid var(--edge);border-bottom-width:9px;border-radius:8px 12px 12px 8px;isolation:isolate;perspective:1500px}.binder-open.is-empty{--hinge:50%;min-height:320px}.binder-inside-left,.binder-inside-right{position:absolute;inset:0 auto 0 0;width:var(--hinge);background:#d6d2c6;border-right:2px solid #aaa799;z-index:-2}.binder-inside-left span{display:block;font-size:13px;font-weight:700;letter-spacing:2px;color:#7e8075;padding:24px 20px;line-height:1.8}.binder-inside-right{left:var(--hinge);right:0;width:auto;background:#e0ddd2;border:0}.binder-rings{position:absolute;top:0;bottom:0;left:var(--hinge);width:12px;transform:translateX(-50%);background:#a5afb1;border:1px solid #7b858a;border-radius:6px;z-index:3;pointer-events:none}.binder-rings i{position:absolute;top:19%;left:-10px;width:31px;height:16px;border:4px solid #cbd2d2;border-bottom-color:#899395;border-radius:10px}.binder-rings i+i{top:auto;bottom:19%}.bristol-paper{grid-column:2;position:relative;min-width:0;min-height:370px;margin:12px 9px 12px 14px;padding:24px 20px 50px;border:1px solid #0002;border-bottom:5px solid #0002;border-radius:2px 6px 6px 2px;background:var(--paper);color:#282d36;overflow-wrap:anywhere;touch-action:pan-y;transform-origin:left center}.paper-lavender{--paper:#e4daf1}.paper-mint{--paper:#d4e9d7}.paper-peach{--paper:#f1d7ca}.paper-blue{--paper:#d6e5ef}.paper-yellow{--paper:#eee6ba}.paper-header{display:flex;align-items:center;justify-content:space-between;gap:6px;border-bottom:1px solid #3333;padding-bottom:8px;margin-bottom:20px;font-size:9px;letter-spacing:1px}.paper-edit{background:none;color:#444754;font-size:11px;min-height:44px;padding:4px;letter-spacing:0}.bristol-paper h2{font-size:24px;line-height:1.25;margin-bottom:24px;letter-spacing:-.5px}.paper-entries section{padding:0 0 18px;margin:0 0 18px;border-bottom:1px solid #3332}.paper-entries h3{font-size:14px;line-height:1.5;margin-bottom:8px}.paper-entries p{font-size:14px;line-height:1.7;white-space:pre-wrap;user-select:text}.paper-credit{display:block;margin-top:10px;font-size:9px;line-height:1.5;color:#50515c}.paper-credit a{text-decoration:underline}.paper-footer{position:absolute;bottom:18px;left:20px;font-size:9px;letter-spacing:1px;color:#555764}.paper-placeholder{font-size:14px;line-height:1.7;color:#535461}.paper-navigation{display:flex;align-items:center;justify-content:center;gap:24px;margin:20px 0}.paper-navigation span{font-size:12px;color:var(--muted)}.paper-navigation button{min-width:48px;font-size:18px}.paper-navigation button:disabled{opacity:.35}.empty-binder{text-align:center;margin:26px auto 22px;max-width:330px}.empty-binder h2{font-size:21px;margin:0 0 10px}.empty-binder p{font-size:13px;color:var(--muted);line-height:1.65}.add-notions{margin:22px auto 0;max-width:350px;width:100%;font-size:14px}.binder-tip{text-align:center}.course-access{display:flex;justify-content:flex-end;margin:0 0 12px}.course-access button{font-size:12px;margin:0;min-height:44px}.save-quiz-notion{font-size:12px;display:block;margin:12px 0 0;min-height:44px;padding:8px 12px;background:#272232;color:#dec7f8;border:1px solid #6a557f;border-radius:10px}#revision-dialog{padding:22px;width:min(640px,calc(100% - 24px));max-height:calc(100dvh - 32px);overscroll-behavior:contain}.revision-modal-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.revision-modal-top h2{font-size:22px}.field-label{display:block;font-size:13px;margin:18px 0 9px;color:#ddd3e9}.field-label span{color:var(--muted);font-size:11px}#revision-dialog input:not([type=radio]):not([type=checkbox]),#revision-dialog select,#revision-dialog textarea{display:block;width:100%;min-height:48px;border:1px solid #665774;border-radius:10px;padding:12px;background:#211d29;color:#f5f3fa;font:inherit;font-size:16px;max-width:100%}#revision-dialog textarea{resize:vertical}#revision-dialog input:focus-visible,#revision-dialog select:focus-visible,#revision-dialog textarea:focus-visible{outline:2px solid #b297ff;outline-offset:2px}.notion-choice{display:flex;align-items:flex-start;gap:12px;padding:18px 2px;border-bottom:1px solid var(--line);cursor:pointer}.notion-choice input,.edit-entries input{accent-color:#b297ff;width:20px;height:20px;flex-shrink:0;margin:2px 0}.notion-choice strong{display:block;font-size:14px;line-height:1.5}.notion-choice span span{display:block;font-size:13px;color:#bcb4c7;line-height:1.65;margin-top:7px}.notion-actions{position:sticky;bottom:-22px;margin-top:18px;padding:16px 0 5px;background:var(--bg)}.notion-actions>span{display:block;color:var(--muted);font-size:12px;margin-bottom:10px}.notion-actions .primary,#bristol-form>.primary{width:100%;font-size:14px}#bristol-form>.primary{margin-top:24px}.editor-subject{color:var(--muted);font-size:12px}.paper-palette{border:0;margin:20px 0;padding:0;display:flex;flex-wrap:wrap;gap:9px}.paper-palette legend{font-size:13px;margin-bottom:12px}.paper-palette label{background:var(--paper);color:#282d36;position:relative;border:3px solid transparent;border-radius:9px;min-height:46px;display:flex;align-items:center;gap:5px;padding:8px;font-size:11px;cursor:pointer}.paper-palette label:has(input:checked){border-color:#9c75dc}.paper-palette input{accent-color:#674197;margin:0;width:16px;height:16px}.edit-entries{padding:12px;border:1px solid var(--line);border-radius:10px;margin-top:18px}.edit-entries legend{font-size:12px}.edit-entries label{display:flex;gap:10px;align-items:center;font-size:13px;line-height:1.5;min-height:48px}.delete-card{color:#e9b0aa;font-size:12px}#delete-confirm{border:1px solid #785652;border-radius:12px;padding:14px;font-size:13px;line-height:1.6}#delete-confirm button{margin-top:12px}#toast{z-index:30}#revision-dialog [hidden]{display:none!important}
@media(max-width:1000px) and (min-width:701px){.binder-shelf{gap:17px}.cover-label{left:29px}.cover-bottom{left:29px;font-size:6px}.cover-label strong{font-size:25px}.binder-open{--hinge:22%}}
@media(max-width:700px){.nav{min-width:0;flex:1;padding:8px 5px;font-size:10px}.binder-shelf{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px 25px;padding:35px 7px 6px}.binder-object{aspect-ratio:1/1.12}.cover-label strong{font-size:30px}.binder-caption{margin-top:18px}.cover-label{left:30px;top:17%}.cover-bottom{left:30px;font-size:6px}.cover-label>span:first-child{font-size:7px;letter-spacing:1px}.cover-icon{margin-top:8px}.cover-icon svg{width:32px;height:32px}.revision-hint{text-align:left;margin-top:24px}.revision-tools{margin-top:20px}.binder-open{--hinge:9%;min-height:370px;border-width:4px;border-bottom-width:7px}.binder-open.is-empty{min-height:260px;--hinge:50%}.has-paper .binder-inside-left span{display:none}.bristol-paper{margin:9px 5px 9px 9px;padding:16px 14px 45px;min-height:350px}.bristol-paper h2{font-size:22px}.paper-header{font-size:8px;letter-spacing:.7px;margin-bottom:18px}.paper-edit{font-size:10px}.paper-entries p{font-size:14px}.binder-rings{width:9px}.binder-rings i{left:-7px;width:23px;height:14px;border-width:3px}.binder-toolbar{gap:4px}.binder-toolbar .text-button{font-size:12px}.binder-toolbar>span{font-size:14px}#revision-dialog{padding:18px 16px;max-height:calc(100dvh - 24px);border-radius:18px}.revision-modal-top h2{font-size:20px}.notion-actions{bottom:-18px}.paper-palette{gap:6px}.paper-palette label{padding:6px;font-size:10px}}
@media(prefers-reduced-motion:reduce){.binder-object{transition:none}}

.revision-toast{padding:12px;border:1px solid #8f789f;border-radius:10px;background:#30253c;color:#e9d6fa;font-size:13px;line-height:1.5;margin-bottom:12px}

.paste-notion{display:block;margin:12px auto;min-height:44px;font-size:13px}.notion-text{-webkit-user-select:text;user-select:text;cursor:text}.notion-choice{cursor:default}#passage-action{border:1px solid #655178;border-radius:12px;padding:12px;margin-bottom:14px}#passage-preview{font-size:12px;line-height:1.5;color:#d5c7e3;max-height:85px;overflow:auto;margin-bottom:8px}#save-passage{width:100%;font-size:12px;line-height:1.5}.entry-preview{padding:12px;border:1px solid var(--line);border-radius:10px;margin-bottom:16px;font-size:13px;line-height:1.6}.entry-preview summary{cursor:pointer;min-height:32px}.entry-preview p{white-space:pre-wrap;overflow-wrap:anywhere;margin:12px 0}#paste-notion-form .primary{width:100%;font-size:14px}

/* Deliberate opening scene: two-sided solid lid, spine thickness, hinge and rings. */
#binder-opening{width:100vw;max-width:none;height:100dvh;max-height:none;inset:0;margin:0;border:0;border-radius:0;padding:env(safe-area-inset-top,0px) 16px env(safe-area-inset-bottom,0px);background:#0d0e12;overflow:hidden}
#binder-opening[open]{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:36px}
.opening-label{text-align:center;font-size:10px;letter-spacing:2px;color:#a9a1b8}.opening-label strong{display:block;margin-top:10px;font-size:22px;letter-spacing:0;color:#f5f3fa}
.opening-stage{width:min(680px,calc(100vw - 40px));height:clamp(220px,42vw,370px);perspective:1700px;perspective-origin:50% 38%;flex-shrink:0;position:relative}
.opening-model{position:absolute;inset:0;transform-style:preserve-3d;will-change:transform}
.opening-base{position:absolute;left:50%;right:0;top:0;bottom:0;background:#dfdbce;border:6px solid var(--edge);border-bottom-width:9px;border-radius:3px 10px 10px 3px;transform:translateZ(-5px)}
.opening-inner-mark{display:block;padding:22px 18px;color:#838578;font-size:10px;letter-spacing:1px}
.opening-lid{position:absolute;left:50%;right:0;top:0;bottom:0;transform-origin:0 50%;transform-style:preserve-3d;will-change:transform}
.opening-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:3px 10px 10px 3px}
.opening-outside{transform:translateZ(4px);background:var(--cover);border:1px solid var(--edge);border-bottom:6px solid var(--edge);border-right:4px solid var(--edge);color:var(--cover-ink);padding:38px 20px 20px 40px;display:flex;align-items:flex-start;flex-direction:column}
.opening-spine{position:absolute;inset:0 auto 0 0;width:23px;background:var(--edge)}.opening-spine i{position:absolute;left:8px;top:17%;width:7px;height:9px;border-radius:50%;background:#bbc5c5;border:1px solid #718082}.opening-spine i+i{top:80%}
.opening-brand{font-size:9px;letter-spacing:1.5px}.opening-outside>strong{font-size:clamp(25px,5vw,48px);letter-spacing:-1px;margin-top:18px}.opening-symbol{margin-top:24px}.opening-symbol svg{width:44px;height:44px;stroke-width:1.4}.opening-outside>small{margin-top:auto;font-size:8px;letter-spacing:1px}
.opening-inside{transform:rotateY(180deg) translateZ(3px);background:#d6d2c6;border:6px solid var(--edge);border-bottom-width:9px;border-radius:10px 3px 3px 10px;color:#7d8174;padding:24px 20px;font-size:12px;letter-spacing:2px;line-height:1.8;font-weight:bold}
.opening-lid-edge{position:absolute;top:0;right:0;bottom:0;width:7px;background:var(--edge);transform:rotateY(90deg);transform-origin:right;backface-visibility:visible}
.opening-rings{position:absolute;left:50%;top:5%;bottom:5%;width:12px;background:#a0abae;border:1px solid #758184;border-radius:8px;transform:translateX(-50%) translateZ(12px);transform-style:preserve-3d}.opening-rings i{position:absolute;left:-13px;top:15%;width:38px;height:20px;border:5px solid #bdc9cb;border-bottom-color:#748286;border-right-color:#8b999c;border-radius:50%;transform:rotateX(25deg) translateZ(8px)}.opening-rings i+i{top:auto;bottom:15%}
.opening-pages{position:absolute;inset:10px 6px 10px 10px;background:#dedacb;border-right:calc(2px + var(--sheets)*1px) double #aca99a;border-bottom:calc(2px + var(--sheets)*1px) double #aca99a;border-radius:3px;transform:translateZ(3px)}.opening-sheet{position:absolute;inset:0;background:var(--paper);padding:22px 16px;color:#34343c;overflow:hidden;border:1px solid #0002;border-radius:2px;display:flex;flex-direction:column;gap:18px}.opening-sheet small{font-size:8px;letter-spacing:1px;border-bottom:1px solid #3333;padding-bottom:14px}.opening-sheet strong{font-size:clamp(14px,2.5vw,24px);line-height:1.3;overflow-wrap:anywhere}.opening-sheet>span{font-size:12px;line-height:1.6;overflow-wrap:anywhere}
#skip-binder-opening{font-size:12px;min-height:44px;margin:0;color:#b7a8c9}
@media(max-width:600px){.opening-outside{padding:26px 10px 16px 28px}.opening-spine{width:17px}.opening-spine i{left:5px;width:6px}.opening-brand{font-size:7px;letter-spacing:.8px}.opening-symbol svg{width:30px;height:30px}.opening-outside>small{font-size:6px;letter-spacing:.5px}.opening-sheet{padding:18px 9px;gap:14px}.opening-sheet>span{font-size:10px}.opening-rings{width:9px}.opening-rings i{width:27px;height:15px;left:-9px;border-width:4px}.opening-inside{padding:18px 12px;font-size:10px}#binder-opening[open]{gap:28px}}
@media(max-height:520px){.opening-label{display:none}.opening-stage{height:65dvh;width:min(530px,calc(100vw - 40px))}#binder-opening[open]{gap:12px}.opening-outside{padding-top:16px}.opening-symbol{margin-top:10px}}

/* Simple covers and a persistent animation preference. */
.cover-label{top:24%}.settings-panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px}.settings-panel h2{font-size:16px;margin:0 0 16px}.settings-toggle{position:relative;display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:56px;font-size:14px;line-height:1.5;cursor:pointer}.settings-toggle input{position:absolute;right:0;width:50px;height:30px;opacity:0;margin:0;cursor:pointer}.switch-track{width:50px;height:30px;border-radius:20px;background:#45414f;border:1px solid #6d657c;flex-shrink:0;pointer-events:none}.switch-track:after{content:'';display:block;width:22px;height:22px;border-radius:50%;background:#ece8f3;margin:3px;transition:transform .18s}.settings-toggle input:checked+.switch-track{background:#8062b3;border-color:#c2a7f0}.settings-toggle input:checked+.switch-track:after{transform:translateX(20px)}.settings-toggle input:focus-visible+.switch-track{outline:3px solid var(--green);outline-offset:4px}@media(max-width:370px){.nav{font-size:9px;padding-left:2px;padding-right:2px}.settings-panel{padding:17px}}