:root{
  --bg:#0b1220;
  --bg-soft:#111827;
  --panel:#ffffff;
  --panel-2:#f8fafc;
  --panel-3:#eef2ff;
  --line:#d7ddea;
  --line-strong:#c4cddd;
  --text:#162033;
  --muted:#6b7280;
  --accent:#2563eb;
  --accent-soft:#dbeafe;
  --success:#059669;
  --danger:#dc2626;
  --warning:#f59e0b;
  --dark:#0f172a;
  --radius:18px;
  --shadow:0 16px 40px rgba(15,23,42,.12);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Inter,Arial,sans-serif;background:linear-gradient(135deg,#eff4ff,#f7f9fc);color:var(--text)}
a{text-decoration:none;color:inherit}
input,textarea,select,button{font:inherit}
input,textarea,select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text)}
textarea{min-height:110px;resize:vertical}
button{cursor:pointer}
.btn,.tool-btn,.nav-tool,.stage-tool{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 14px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--text);cursor:pointer;transition:.18s ease}
.btn:hover,.nav-tool:hover,.stage-tool:hover{transform:translateY(-1px);box-shadow:0 10px 18px rgba(15,23,42,.08)}
.btn-primary,.tool-btn.accent{background:linear-gradient(135deg,#2563eb,#4f46e5);border-color:transparent;color:#fff}
.btn-secondary{background:var(--panel-3);border-color:#cdd9ff;color:#1e3a8a}
.btn-ghost{background:#fff}
.btn-danger{background:linear-gradient(135deg,#ef4444,#dc2626);border-color:transparent;color:#fff}
.auth-body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{width:min(440px,100%);background:rgba(255,255,255,.92);backdrop-filter:blur(18px);border:1px solid rgba(255,255,255,.8);border-radius:24px;padding:32px;box-shadow:var(--shadow)}
.brand-mark,.editor-brand-mark{width:54px;height:54px;border-radius:16px;background:linear-gradient(135deg,#2563eb,#4f46e5);display:grid;place-items:center;font-weight:800;color:#fff}
.stack{display:grid;gap:14px}
.stack.tight{gap:10px}
.flash{padding:12px 14px;border-radius:12px;margin:12px 0;background:#ecfdf5;border:1px solid #a7f3d0}
.flash.error{background:#fef2f2;border-color:#fecaca}
.subtle-link{display:inline-block;margin-top:16px;color:#475569}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:16px 24px;background:rgba(255,255,255,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(215,221,234,.85)}
.logo{font-weight:800}
.topnav{display:flex;gap:18px;color:#475569}
.user-chip{padding:10px 14px;background:#fff;border-radius:999px;border:1px solid var(--line)}
.main{padding:24px;display:grid;gap:24px}
.split-main{grid-template-columns:380px 1fr;align-items:start}
.split-main-xl{grid-template-columns:400px 1fr}
.hero,.panel,.stat-card,.project-card{background:rgba(255,255,255,.92);border:1px solid rgba(215,221,234,.9);border-radius:24px;box-shadow:var(--shadow)}
.hero{padding:28px;display:flex;justify-content:space-between;align-items:center}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.stat-card{padding:22px}.stat-card span{display:block;color:#64748b;margin-bottom:6px}.stat-card strong{font-size:34px}
.panel{padding:22px}
.panel-head,.side-panel-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.panel-form{position:sticky;top:88px}
.project-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.project-card{padding:18px;display:grid;gap:14px}
.project-card p,.project-card span,.project-card small{color:#64748b}
.project-card-rich{gap:18px}
.project-card-top{display:grid;grid-template-columns:56px 1fr;gap:14px;align-items:start}
.project-thumb-placeholder{width:56px;height:56px;border-radius:16px;background:linear-gradient(135deg,#2563eb,#4f46e5);display:grid;place-items:center;color:#fff;font-weight:800;font-size:22px}
.project-actions{display:flex;gap:10px}.wrap-actions{flex-wrap:wrap}
.editor-body{overflow:hidden;background:#e9edf5}
.lk-editor{display:grid;grid-template-columns:264px 1fr;height:100vh;color:var(--text)}
.editor-nav{background:linear-gradient(180deg,#0f172a,#111827);color:#fff;padding:18px 16px;display:grid;align-content:start;gap:18px;overflow:auto}
.editor-brand{display:grid;grid-template-columns:54px 1fr;gap:12px;align-items:center;padding:10px 6px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.editor-brand span{display:block;color:#a8b4cc;font-size:13px;margin-top:4px}
.nav-section{display:grid;gap:10px}
.nav-section-title{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:#94a3b8;padding:2px 6px}
.nav-tool{width:100%;justify-content:flex-start;padding:12px 14px;background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.08);color:#fff;box-shadow:none}
.nav-tool:hover{background:rgba(255,255,255,.09);box-shadow:none;transform:none}
.nav-tool-icon{width:30px;height:30px;border-radius:10px;background:rgba(255,255,255,.12);display:grid;place-items:center;font-size:12px;font-weight:700;flex:none}
.upload-tool input{display:none}
.editor-main{display:grid;grid-template-rows:auto 1fr;min-width:0}
.editor-ribbon{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:16px 18px;background:#fff;border-bottom:1px solid var(--line)}
.editor-ribbon-left{display:grid;gap:12px;min-width:0;flex:1}
.project-title-input{max-width:420px;font-size:22px;font-weight:700;padding:13px 16px;border-radius:14px}
.editor-meta-row{display:flex;gap:12px;flex-wrap:wrap}.editor-meta-row label{display:grid;gap:6px;font-size:12px;color:#64748b;min-width:110px}.editor-meta-row input{padding:10px 12px}
.editor-ribbon-right{display:flex;gap:10px;flex-wrap:wrap}
.editor-chip{padding:10px 14px;border-radius:999px;background:#f8fafc;border:1px solid var(--line);font-size:13px;color:#475569}
.editor-content{display:grid;grid-template-columns:240px minmax(0,1fr) 320px;gap:16px;padding:16px;height:calc(100vh - 100px);min-height:0}
.scene-sidebar,.inspector,.stage-column{min-height:0;display:grid;gap:16px}
.side-panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px;box-shadow:var(--shadow);overflow:auto}
.side-panel h3{margin:0;font-size:16px}
.scene-tabs.vertical{display:grid;gap:10px}
.scene-tab{padding:14px;border-radius:14px;border:1px solid var(--line);background:#fff;display:grid;gap:4px;text-align:left;cursor:pointer}
.scene-tab strong{font-size:14px}.scene-tab span{font-size:12px;color:#64748b}.scene-tab.active{border-color:#8fb5ff;background:#eef4ff}
.layers-list{display:grid;gap:10px}.layer-item{padding:12px 14px;border-radius:14px;background:#fff;border:1px solid var(--line);display:grid;gap:6px;cursor:pointer}.layer-item div{display:grid;gap:2px}.layer-item span,.layer-item small{color:#64748b}.layer-item.active{border-color:#8fb5ff;background:#eef4ff}
.stage-column{grid-template-rows:auto 1fr auto}
.stage-toolbar{display:flex;align-items:center;gap:10px;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.stage-tool{width:40px;height:40px;padding:0}.stage-tool.wide{width:auto;padding:10px 14px}
.stage-canvas-wrap{background:linear-gradient(180deg,#dde3ef,#edf2fa);border:1px solid #cfd8e6;border-radius:24px;box-shadow:inset 0 1px 0 rgba(255,255,255,.6);overflow:hidden;min-height:0}
.stage-scroll{width:100%;height:100%;overflow:auto;padding:32px}
.stage-viewport{position:relative;margin:0 auto}
.stage-editor{position:absolute;left:0;top:0;transform-origin:top left;border-radius:18px;overflow:hidden;box-shadow:0 30px 80px rgba(15,23,42,.22);background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:32px 32px}
.timeline-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.timeline-title{font-weight:700}.timeline-summary{font-size:13px;color:#64748b;text-align:right}
.stage-element{position:absolute;border:1px solid transparent;user-select:none}.stage-element.selected{outline:2px solid #2563eb;outline-offset:2px}.stage-element.locked{opacity:.7}
.stage-element img,.stage-element video{width:100%;height:100%;display:block;object-fit:contain;pointer-events:none;border-radius:inherit}
.el-content{width:100%;height:100%}
.text-el{white-space:pre-wrap}
.stage-element-button .text-el,.stage-element-marker .text-el{display:grid;place-items:center;height:100%}
.stage-element-shape{border:1px solid rgba(255,255,255,.08)}
.shape-label{position:absolute;left:12px;top:10px;padding:4px 8px;background:rgba(255,255,255,.16);border-radius:999px;font-size:12px;color:#fff}
.media-box{display:grid;gap:10px;padding:12px;background:rgba(255,255,255,.08);border-radius:14px;color:#fff}
.quiz-card-editor{background:rgba(7,15,31,.28);backdrop-filter:blur(12px);border-radius:20px;padding:20px;border:1px solid rgba(255,255,255,.12);display:grid;gap:16px}
.quiz-title{font-size:28px;font-weight:700;color:#fff;line-height:1.2}.quiz-options-grid{display:grid;gap:10px}.quiz-option{display:grid;grid-template-columns:36px 1fr;align-items:center;gap:12px;padding:12px 14px;background:rgba(255,255,255,.12);border-radius:14px;color:#fff}.quiz-option strong{width:36px;height:36px;border-radius:10px;background:#2563eb;display:grid;place-items:center}.quiz-footer{color:#dbeafe;font-size:13px}.hud-chip{display:inline-flex;padding:8px 12px;border-radius:999px;background:rgba(0,0,0,.25);color:#fff;font-weight:700}
.resize-handle{position:absolute;right:-7px;bottom:-7px;width:16px;height:16px;border-radius:50%;background:#2563eb;border:2px solid #fff;cursor:nwse-resize;box-shadow:0 6px 12px rgba(37,99,235,.35)}
.inspector label{display:grid;gap:6px;font-size:12px;color:#64748b}.inspector textarea{min-height:90px}
.trigger-list{display:grid;gap:10px}.trigger-item{display:flex;justify-content:space-between;gap:10px;padding:12px;border:1px solid var(--line);border-radius:14px;background:#f8fafc}.trigger-item div{display:grid;gap:4px}.trigger-item span,.trigger-item small{color:#64748b}.trigger-remove{padding:8px 10px;border-radius:10px;border:1px solid #fecaca;background:#fff1f2;color:#b91c1c;align-self:start}
.variables-box{white-space:pre-wrap;color:#475569;font-family:inherit;margin:0;line-height:1.7}
.preview-body{margin:0;background:#0f172a;color:#fff;font-family:Inter,Arial,sans-serif}
.preview-shell{display:flex;flex-direction:column;height:100vh}
.preview-topbar{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;background:rgba(15,23,42,.92);border-bottom:1px solid rgba(255,255,255,.08)}
.preview-stage-wrap{flex:1;display:grid;place-items:center;overflow:auto;padding:24px}.preview-stage-box{position:relative;overflow:hidden;border-radius:20px;box-shadow:0 30px 90px rgba(0,0,0,.38)}
.preview-hud{position:absolute;top:16px;right:16px;display:flex;gap:10px;z-index:5}.preview-chip{padding:10px 14px;border-radius:999px;background:rgba(0,0,0,.34);font-weight:700}
.preview-nav{position:absolute;right:18px;bottom:18px;z-index:5;display:flex;gap:10px}
.preview-nav button{padding:12px 16px;border-radius:12px;border:0;background:#2563eb;color:#fff;font-weight:700}
.preview-finish{display:grid;place-items:center;text-align:center;gap:12px;padding:40px}
.preview-finish strong{font-size:38px}
@media (max-width:1400px){.editor-content{grid-template-columns:220px minmax(0,1fr) 300px}.lk-editor{grid-template-columns:236px 1fr}}
@media (max-width:1180px){.split-main,.split-main-xl{grid-template-columns:1fr}.panel-form{position:static}.editor-content{grid-template-columns:1fr}.scene-sidebar,.inspector{grid-template-columns:1fr 1fr}.editor-body{overflow:auto}.lk-editor{grid-template-columns:1fr;height:auto}.editor-nav{grid-template-columns:repeat(3,1fr);align-items:start}.editor-content{height:auto}.stage-canvas-wrap{min-height:70vh}}
@media (max-width:860px){.editor-nav{grid-template-columns:1fr}.scene-sidebar,.inspector{grid-template-columns:1fr}.editor-ribbon{flex-direction:column}.editor-meta-row label{min-width:calc(50% - 8px)}.timeline-bar{flex-direction:column;align-items:flex-start}.project-grid{grid-template-columns:1fr}}