:root{--bg: #f2f3f7;--panel: #ffffff;--panel-strong: #ffffff;--line: #d9e2f0;--ink: #242a3a;--muted: #6f7787;--accent: #1459c7;--accent-strong: #0f4aac;--shadow: 0 18px 42px rgba(48, 66, 110, .12)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;color:var(--ink);background:#e2e2e2;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}body{min-height:100vh}.editor-shell{height:100vh;display:flex;flex-direction:column;overflow:hidden}.busy-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1200;display:flex;align-items:center;justify-content:center;background:#e8ebf2b8;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.busy-card{width:min(420px,calc(100vw - 32px));padding:28px 28px 24px;border-radius:20px;background:#fffffff5;border:1px solid rgba(207,217,233,.9);box-shadow:0 28px 60px #2d3d612e;text-align:center}.busy-spinner{width:42px;height:42px;margin:0 auto 16px;border-radius:999px;border:3px solid rgba(20,89,199,.16);border-top-color:#1459c7;animation:busy-spin .9s linear infinite}.busy-title{margin:0 0 8px;font-size:1.08rem;font-weight:700;color:#1e2a3f}.busy-message{margin:0;font-size:.95rem;line-height:1.5;color:#5e6677}@keyframes busy-spin{to{transform:rotate(360deg)}}.topbar{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 16px;background:#fff;border-bottom:1px solid #e6ebf3}.topbar-center,.topbar-actions{display:flex;align-items:center;gap:10px}.topbar-actions{justify-self:end}.upload-button{position:relative;overflow:hidden}.upload-button input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.topbar-link{border:0;background:transparent;color:#0552b5;font:inherit;font-weight:700;text-decoration:underline;cursor:pointer;justify-self:start}.icon-button{width:40px;height:40px;border-radius:999px;border:0;background:transparent;color:#b3b3b3;font-size:1.1rem;cursor:pointer}.editor-layout{flex:1;display:flex;min-height:0;overflow:hidden}.eyebrow{margin:0 0 6px;text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;color:var(--accent)}.workspace-column{display:flex;flex-direction:column;width:100%;margin:0;padding:0;height:100%;min-height:0;min-width:0;background:#e2e2e2}.workspace-main{flex:1;min-height:0;display:flex;overflow:hidden}.workspace-header-row{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding-bottom:10px}.workspace-header-row h1{margin:0;font-size:1.35rem;font-weight:600}.workspace-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 20px;border-radius:4px;border:1px solid #dbe4f1;font:inherit;font-weight:600;cursor:pointer;transition:transform .12s ease,background .12s ease,border-color .12s ease,box-shadow .12s ease;text-decoration:none}.nav-arrow{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:0;background:transparent;color:#333;font-size:1.5rem;cursor:pointer}.button:hover,.nav-arrow:hover{transform:translateY(-1px)}.button.primary{border-color:transparent;background:#0552b5;color:#fff;box-shadow:none}.button.secondary{background:#fff;border-color:#dbe4f1;color:#374152}.button.ghost,.nav-arrow{background:#fff;color:#465066}.button.danger{background:#fff2f0;color:#9a2f2f;border-color:#f1c7c1}.canvas-panel{display:flex;min-height:0;flex:1;width:100%;overflow:hidden}.pill{display:inline-flex;align-items:center;min-height:34px;padding:0 14px;border-radius:999px;background:#eff5ff;border:1px solid #c8d8f6;color:var(--accent-strong)}.spread-frame{min-height:0;border-radius:0;background:transparent;border:none;box-shadow:none}.spread-viewport{width:100%;height:100%;min-height:0;padding:8px 12px;overflow:hidden;position:relative;--tool-strip-top: 24px;--tool-strip-left: 24px}.spread-grid{height:100%;display:flex;align-items:stretch;gap:72px;padding:0 40vw;transition:transform .26s ease;will-change:transform}.spread-group{flex:0 0 auto;height:100%;display:flex;align-items:stretch}.cover-group{justify-content:center}.inner-group{gap:0;position:relative}.trifold-group{gap:0}.spread-panel{width:auto;height:100%;display:flex;align-items:stretch;justify-content:center;text-align:left;opacity:1;transition:opacity .18s ease;position:relative}.inner-group .spread-panel,.trifold-group .spread-panel{border-radius:0}.inner-group .spread-panel:first-child:before{content:"";position:absolute;top:0;right:-1px;width:24px;height:100%;background:linear-gradient(90deg,#312a2400,#312a2405 18%,#312a240e 46%,#312a2405 76%,#312a2400);pointer-events:none;z-index:3}.inner-group .spread-panel:last-child:before{content:"";position:absolute;top:0;left:-1px;width:24px;height:100%;background:linear-gradient(270deg,#312a2400,#312a2404 18%,#312a240a 46%,#312a2404 76%,#312a2400);pointer-events:none;z-index:3}.vertical-card .inner-group .spread-panel:first-child:before{background:linear-gradient(270deg,#312a2400,#312a2405 18%,#312a240e 46%,#312a2405 76%,#312a2400)}.vertical-card .inner-group .spread-panel:last-child:before{background:linear-gradient(90deg,#312a2400,#312a2404 18%,#312a240a 46%,#312a2404 76%,#312a2400)}.inner-group:after{content:"";position:absolute;top:3%;bottom:3%;left:50%;width:1px;transform:translate(-50%);background:linear-gradient(180deg,transparent,rgba(105,88,70,.1),transparent);pointer-events:none;z-index:4}.spread-panel.active{opacity:1}.spread-panel .canvas-container{display:block;height:100%;max-height:100%;margin:0 auto}.spread-panel canvas.lower-canvas{border-radius:0;background:#fff;box-shadow:none}.spread-panel.locked-side:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#00000008;pointer-events:none;z-index:2}.meta-copy,.status-text,.session-link{color:var(--muted)}.workspace-status-row{display:none}.status-text{margin:0}.bottom-strip{margin-top:0;display:flex;align-items:center;justify-content:center;gap:16px;width:100%;min-height:88px;flex:0 0 auto;background:#f8f8f8;border-top:1px solid #d5d5d5}.side-list.thumbnails{display:flex;flex:0 1 auto;gap:12px;min-width:120px;justify-content:center;overflow-x:auto;padding:4px 2px}.side-thumb{display:flex;flex-direction:column;align-items:center;gap:8px;border:0;background:transparent;cursor:pointer;min-width:78px;padding:0;-webkit-appearance:none;-moz-appearance:none;appearance:none}.side-thumb.spread-join-left,.side-thumb.spread-join-right{min-width:auto}.side-thumb-card{display:block;position:relative;flex:0 0 auto;width:52px;height:72px;border-radius:2px;border:1px solid #cfd8e7;background:#fff;box-shadow:none}.horizontal-card .side-thumb-card{width:72px;height:52px}.side-thumb-art{position:absolute;top:6px;right:6px;bottom:6px;left:6px;display:flex;flex-direction:column;align-items:center;gap:4px;border-radius:2px;justify-content:center}.side-thumb-title,.side-thumb-line{display:block;background:#2f68e538;border-radius:999px}.side-thumb-title{width:65%;height:10px;margin-top:6px}.side-thumb-line.short{width:48%;height:6px}.side-thumb-line.long{width:76%;height:6px}.side-thumb-lock{position:absolute;bottom:2px;right:2px;font-size:10px;line-height:1;opacity:.6}.side-thumb.active .side-thumb-card{outline:2px solid #0552b5;outline-offset:2px}.side-thumb.spread-join-left .side-thumb-card{border-top-right-radius:0;border-bottom-right-radius:0;margin-right:-3px}.side-thumb.spread-join-right .side-thumb-card{border-top-left-radius:0;border-bottom-left-radius:0;margin-left:-3px}.side-thumb.spread-join-left .side-thumb-card:after{content:"";position:absolute;top:4px;right:-1px;width:12px;height:calc(100% - 8px);background:linear-gradient(90deg,#342d2600,#342d2605 20%,#342d260d 50%,#342d2604 78%,#342d2600);pointer-events:none}.side-thumb.spread-join-right .side-thumb-card:before{content:"";position:absolute;top:4px;left:-1px;width:12px;height:calc(100% - 8px);background:linear-gradient(270deg,#342d2600,#342d2604 20%,#342d260a 50%,#342d2604 78%,#342d2600);pointer-events:none}.vertical-card .side-thumb.spread-join-left .side-thumb-card:after{background:linear-gradient(270deg,#342d2600,#342d2605 20%,#342d260d 50%,#342d2604 78%,#342d2600)}.vertical-card .side-thumb.spread-join-right .side-thumb-card:before{background:linear-gradient(90deg,#342d2600,#342d2604 20%,#342d260a 50%,#342d2604 78%,#342d2600)}.side-thumb-label,.hidden{display:none}.sidebar-panel{position:absolute;top:var(--tool-strip-top);left:var(--tool-strip-left);z-index:5;width:176px;pointer-events:none;transition:top .22s ease,left .22s ease,opacity .18s ease}.sidebar-panel-inner{display:flex;flex-direction:column;gap:14px;padding:14px 12px;border:1px solid rgba(18,34,66,.1);border-radius:18px;background:linear-gradient(180deg,#fffffff5,#f4f7fcf5);box-shadow:0 20px 46px #19294829;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);pointer-events:auto}.sidebar-title{margin:0;font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#607089;text-align:center}.sidebar-tools{display:flex;flex-direction:column;gap:12px}.sidebar-section{display:flex;flex-direction:column;gap:8px}.sidebar-section-label{margin:0;font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#7b889d}.sidebar-tool-list{display:flex;flex-direction:column;gap:10px}.sidebar-tool{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;min-height:68px;padding:12px 8px;background:linear-gradient(180deg,#fff,#f3f6fb);border:1px solid #d7deea;border-radius:14px;font:inherit;font-weight:600;font-size:.8rem;color:#23314d;cursor:pointer;text-align:center;transition:transform .15s ease,background .15s ease,border-color .15s ease,box-shadow .15s ease}.sidebar-tool:hover{background:#fff;border-color:#0552b5;color:#0552b5;transform:translate(2px);box-shadow:0 12px 24px #183f7e1f}.background-preset-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.background-preset{display:block;width:100%;aspect-ratio:1 / 1.14;border:2px solid transparent;border-radius:14px;cursor:pointer;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}.background-preset:hover{transform:translateY(-1px);box-shadow:0 12px 18px #142d5c1f}.background-preset.active{border-color:#0552b5;box-shadow:0 0 0 3px #0552b524}.sidebar-tool-label:before{display:block;margin-bottom:7px;font-size:1.15rem;line-height:1}#addHeadlineBtn .sidebar-tool-label:before{content:"T";font-family:Georgia,serif;font-weight:700}#addMessageBtn .sidebar-tool-label:before{content:"Aa";font-family:Georgia,serif;font-style:italic}label.sidebar-tool .sidebar-tool-label:before{content:"▣"}.sidebar-locked-notice{display:flex;flex-direction:column;justify-content:center;gap:8px;padding:14px 10px;margin:0;color:#66758d;font-size:.76rem;line-height:1.4;text-align:center;background:#f5f7fbeb;border:1px dashed #cad4e4;border-radius:14px}.sidebar-locked-notice.hidden{display:none}.text-toolbar{position:absolute;top:18px;left:18px;z-index:7;display:flex;align-items:end;gap:10px;padding:10px 12px;border:1px solid rgba(18,34,66,.12);border-radius:16px;background:#fffffff5;box-shadow:0 18px 38px #1929482e;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:top .15s ease,left .15s ease,opacity .14s ease}.text-toolbar.hidden{display:none}.text-toolbar-field{display:flex;flex-direction:column;gap:5px}.text-toolbar-label{font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#6b7890}.text-toolbar-select,.text-toolbar-color-input{border:1px solid #d7deea;border-radius:11px;background:#fffffff5;color:#23314d;font:inherit}.text-toolbar-select{min-width:146px;min-height:38px;padding:0 10px}.text-toolbar-color-field{min-width:70px}.text-toolbar-color-input{width:70px;min-height:38px;padding:4px;cursor:pointer}@media(max-width:980px){.workspace-column{padding:14px}.workspace-main{min-height:0}.workspace-header-row{align-items:flex-start;flex-direction:column}.canvas-panel{display:flex}.spread-grid{gap:28px;padding:0 50vw}.spread-panel{transform:scale(.98)}.spread-panel{width:250px}.spread-grid{align-items:stretch}.workspace-status-row{align-items:flex-start;flex-direction:column}.spread-viewport{--tool-strip-top: auto;--tool-strip-left: 16px}.sidebar-panel{top:auto;bottom:16px;left:50%;width:min(420px,calc(100% - 32px));transform:translate(-50%)}.sidebar-panel-inner{padding:12px}.sidebar-tools{display:flex;flex-direction:column}.sidebar-tool-list{display:grid;grid-template-columns:repeat(3,1fr)}.sidebar-tool{min-height:60px;transform:none}.sidebar-tool:hover{transform:translateY(-1px)}.sidebar-locked-notice{flex-direction:row}.background-preset-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.text-toolbar{max-width:calc(100% - 24px);gap:8px;padding:9px 10px}.text-toolbar-select{min-width:122px}}.admin-template-shell{min-height:100vh;padding:24px;background:#eef2f8;color:#1f2a3d}.admin-template-topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}.admin-template-topbar h1{margin:0;font-size:1.5rem}.admin-template-topbar p{margin:6px 0 0;color:#5f6b81}.admin-link{color:#1459c7;font-weight:600}.admin-template-layout{display:grid;grid-template-columns:1fr;gap:14px}.admin-card{background:#fff;border:1px solid #d9e3f2;border-radius:10px;box-shadow:0 10px 24px #283c6014;padding:16px}.admin-card h2{margin:0 0 14px;font-size:1.04rem}.admin-subtitle{margin:6px 0 4px;font-size:.95rem;color:#2a3e5f}.admin-hint{margin:0 0 10px;color:#60708a;font-size:.84rem;line-height:1.45}.admin-divider{height:1px;width:100%;background:linear-gradient(90deg,transparent,#d4dfef 15%,#d4dfef 85%,transparent);margin:8px 0 12px}.admin-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.admin-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.admin-row-between{justify-content:space-between}.admin-field{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}.admin-field span{font-size:.83rem;font-weight:600;color:#526078}.admin-field input,.admin-field select,.admin-field textarea{width:100%;min-height:38px;border:1px solid #cfd9eb;border-radius:8px;padding:8px 10px;background:#fff;font:inherit;color:#213148}.admin-field textarea{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;line-height:1.45;resize:vertical}.admin-checkbox{display:inline-flex;align-items:center;gap:8px;margin-bottom:10px}.admin-status{margin:8px 0 0;color:#3f536f}.admin-status.warning{color:#9c3d3d}.admin-file-btn{cursor:pointer}.admin-side-layout{display:grid;grid-template-columns:minmax(220px,280px) 1fr;gap:12px}.admin-side-list{display:flex;flex-direction:column;gap:8px;max-height:520px;overflow:auto}.admin-side-item{display:block;width:100%;text-align:left;border:1px solid #cfdaee;border-radius:8px;padding:9px 10px;background:#fbfcff;color:#253551;cursor:pointer}.admin-side-item.active{border-color:#1459c7;background:#eef4ff}.admin-visual-panel{margin-bottom:12px}.admin-visual-canvas-wrap{width:100%;min-height:260px;border:1px solid #d5dff0;border-radius:10px;padding:10px;background:linear-gradient(180deg,#f9fbff,#f3f7ff);overflow:auto}#adminVisualCanvas{display:block;margin:0 auto;border:1px solid #ced9ec;border-radius:8px;box-shadow:0 8px 20px #24395c1a;background:#fff}.admin-editor-embed-wrap{width:100%;border:1px solid #d5dff0;border-radius:10px;overflow:hidden;background:#fff;min-height:540px}#adminEmbeddedEditorFrame{width:100%;height:min(76vh,860px);border:0;display:block;background:#fff}.admin-preview-json{width:100%;border:1px solid #cfd9eb;border-radius:8px;padding:10px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;line-height:1.4;color:#20324d;background:#fbfdff}@media(max-width:980px){.admin-template-shell{padding:14px}.admin-template-topbar{flex-direction:column}.admin-grid-2,.admin-side-layout{grid-template-columns:1fr}}