:root{
  --milk:#fff8fc;
  --pink:#f7cfe0;
  --pink2:#e9a9c4;
  --rose:#cc6f98;
  --cocoa:#392d35;
  --cocoa2:#241a22;
  --paper:rgba(255,248,252,.72);
  --paper-strong:rgba(255,248,252,.88);
  --line:rgba(92,54,72,.26);
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);
  --nav-h:76px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;width:100%;height:100%;min-height:100dvh;background:#f8dce9;color:var(--cocoa);font-family:ui-rounded,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow:hidden}
body{overscroll-behavior:none}
button,input,select{font:inherit}
button{color:inherit}
.app-bg{position:fixed;inset:0;background:url('assets/app-bg.jpg') center/cover no-repeat;z-index:-3;filter:saturate(.78) brightness(1.02)}
.app-tint{position:fixed;inset:0;background:linear-gradient(180deg,rgba(255,235,245,.62),rgba(255,248,252,.70));z-index:-2}
#app{position:fixed;inset:0;width:100%;height:100dvh;display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}
.topbar{padding:calc(var(--safe-top) + 8px) 10px 8px;min-height:64px;display:grid;grid-template-columns:44px 1fr 44px;gap:8px;align-items:center;background:rgba(255,243,249,.74);border-bottom:1px dashed rgba(93,57,74,.22)}
.brand{min-width:0;display:flex;align-items:center;justify-content:center;gap:8px;text-align:left}
.brand-icon{width:38px;height:38px;object-fit:cover;border-radius:50%;border:2px solid #fff;box-shadow:0 4px 16px rgba(65,38,51,.16)}
.brand strong{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand small{display:block;font-size:10px;opacity:.65;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{width:42px;height:42px;border:1px solid rgba(90,55,72,.18);border-radius:16px;background:rgba(255,255,255,.72);box-shadow:0 5px 18px rgba(80,45,63,.08);font-size:19px}
.view{min-height:0;overflow-y:auto;overflow-x:hidden;padding:12px 12px 24px;scrollbar-width:none}
.view::-webkit-scrollbar{display:none}
.bottom-nav{padding:8px 8px calc(8px + var(--safe-bottom));display:grid;grid-template-columns:repeat(5,1fr);gap:5px;background:rgba(255,247,251,.88);border-top:1px dashed rgba(93,57,74,.22)}
.nav-btn{min-width:0;border:0;background:transparent;border-radius:16px;padding:7px 2px;display:grid;place-items:center;gap:2px}
.nav-btn span{font-size:19px}
.nav-btn small{font-size:9.5px}
.nav-btn.active{background:rgba(231,169,196,.33);box-shadow:inset 0 0 0 1px rgba(138,76,103,.14)}
.card{position:relative;background:var(--paper);border:1px solid rgba(87,51,69,.13);border-radius:26px;padding:16px;box-shadow:0 12px 28px rgba(65,37,52,.09);overflow:hidden}
.card::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(rgba(93,57,74,.13) 1px,transparent 1px);background-size:13px 13px;opacity:.35;mask-image:linear-gradient(90deg,black,transparent 70%)}
.card>*{position:relative}
.hero{min-height:255px;padding:18px;border:2px solid rgba(78,49,62,.28);background:linear-gradient(145deg,rgba(249,210,227,.82),rgba(255,248,252,.80));border-radius:30px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-35px;bottom:-40px;width:180px;height:180px;background:radial-gradient(circle at 50% 50%,rgba(57,45,53,.92) 0 48%,transparent 49%),radial-gradient(circle,rgba(255,222,235,.9) 0 4px,transparent 5px);background-size:100% 100%,24px 24px;clip-path:polygon(50% 0,61% 35%,98% 35%,68% 57%,79% 94%,50% 71%,21% 94%,32% 57%,2% 35%,39% 35%);opacity:.42;transform:rotate(12deg)}
.pixel-window{background:#2f252c;color:#fff0f7;border:3px solid #f3bdd4;border-radius:22px;padding:10px;box-shadow:inset 0 0 0 3px #5b4652}
.pixel-bar{height:15px;border:2px solid #f1bfd4;background:#513b48;border-radius:2px;margin-bottom:10px;display:flex;gap:4px;align-items:center;padding:0 5px}
.pixel-bar i{width:7px;height:7px;background:#f5d1e1;display:block}
.window-inner{border:1px dashed #f3bdd4;padding:14px;background:linear-gradient(180deg,#342831,#241b22);min-height:145px}
.window-inner h1{font-size:25px;margin:0 0 7px;font-family:Georgia,serif;font-style:italic}
.window-inner p{font-size:12px;line-height:1.6;margin:0;opacity:.88}
.cta-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.btn{border:1px solid rgba(74,45,58,.18);background:rgba(255,255,255,.84);border-radius:18px;padding:11px 14px;font-weight:700;box-shadow:0 4px 12px rgba(60,33,47,.06)}
.btn.primary{background:#382b33;color:#ffeaf4}
.btn.pink{background:#efb8cf;color:#3a2932}
.section-title{display:flex;align-items:center;gap:8px;margin:18px 4px 10px;font-size:14px}
.section-title::before,.section-title::after{content:"";height:1px;background:rgba(91,55,72,.18);flex:1}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat{background:rgba(255,250,252,.78);border:1px solid rgba(90,55,72,.13);border-radius:22px;padding:14px}
.stat strong{font-size:24px;display:block}
.stat small{opacity:.66}
.palette{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:10px;background:#2d2229;border-radius:24px}
.palette span{height:72px;border-radius:999px;border:2px solid white;display:flex;align-items:flex-end;justify-content:center;padding-bottom:10px;font-size:9px}
.palette span:nth-child(1){background:#241a22;color:#fff}
.palette span:nth-child(2){background:#e5a9bf;color:#fff}
.palette span:nth-child(3){background:#372d36;color:#fff}
.palette span:nth-child(4){background:#fdd6dd;color:#5a4650}
.lesson-list{display:grid;gap:10px}
.lesson-row{display:grid;grid-template-columns:52px minmax(0,1fr) auto;gap:10px;align-items:center;background:rgba(255,252,253,.83);border-radius:24px;padding:10px 12px;border:1px solid rgba(91,55,72,.12)}
.lesson-avatar{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,#f5c8dc,#fff);border:1px solid rgba(90,55,72,.18);font-weight:800}
.lesson-row h3{font-size:13px;margin:0 0 4px}
.lesson-row p{font-size:10.5px;opacity:.65;margin:0;line-height:1.4}
.chip{font-size:9px;padding:5px 8px;border-radius:999px;background:rgba(231,169,196,.34);white-space:nowrap}
.searchbar{position:sticky;top:-12px;z-index:8;padding:8px 0;background:linear-gradient(180deg,rgba(248,220,233,.98),rgba(248,220,233,.82),transparent)}
.searchbar input{width:100%;border:1px solid rgba(85,51,67,.16);background:rgba(255,255,255,.88);border-radius:18px;padding:12px 14px;outline:none}
.filter-row{display:flex;gap:7px;overflow-x:auto;padding:4px 0 10px;scrollbar-width:none}
.filter-row::-webkit-scrollbar{display:none}
.filter-chip{white-space:nowrap;border:1px solid rgba(88,53,70,.14);background:rgba(255,255,255,.75);border-radius:999px;padding:8px 11px;font-size:10px}
.filter-chip.active{background:#3a2b33;color:#ffeef6}
.detail-head{background:#2e232a;color:#ffeef6;border-radius:26px;padding:18px;position:relative;overflow:hidden}
.detail-head h2{margin:5px 0 8px;font-size:22px}
.detail-head small{opacity:.75}
.lesson-section{margin-top:10px}
.lesson-section h3{font-size:13px;margin:0 0 8px}
.lesson-section p,.lesson-section li{font-size:12px;line-height:1.65}
.lesson-section ol,.lesson-section ul{padding-left:20px;margin:6px 0}
.diagram{background:linear-gradient(180deg,rgba(255,255,255,.86),rgba(248,225,236,.86));border-radius:24px;padding:10px;border:1px solid rgba(86,52,68,.15)}
.diagram svg{width:100%;height:auto;display:block}
.note-box{background:rgba(254,246,250,.82);border-left:4px solid #cf789f;border-radius:12px;padding:10px 12px;font-size:11px;line-height:1.55}
.lab-shell{background:#2f252c;color:#ffeaf5;border-radius:28px;padding:12px;border:3px solid #ebb0ca;box-shadow:inset 0 0 0 3px #513943}
.lab-title{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-bottom:8px}
.lab-stage{height:290px;border:2px solid #efb8cf;background:linear-gradient(180deg,#f4dae6,#d7c8d0);border-radius:18px;position:relative;overflow:hidden}
.lab-stage::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(54,41,48,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(54,41,48,.08) 1px,transparent 1px);background-size:25px 25px;pointer-events:none}
.node{position:absolute;display:grid;place-items:center;transform-origin:center;border:2px solid #3a2d34;border-radius:18px;background:#fff7fb;color:#3b2d35;padding:8px;min-width:70px;min-height:48px;box-shadow:0 8px 18px rgba(44,30,38,.15);z-index:2}
.node.null{border-style:dashed;background:rgba(236,171,199,.78)}
.node.child2{background:rgba(255,255,255,.92)}
.connector{position:absolute;height:2px;background:#cf7ca2;transform-origin:0 50%;z-index:1}
.controls{display:grid;gap:9px;margin-top:12px}
.control{display:grid;grid-template-columns:75px 1fr 46px;align-items:center;gap:8px;font-size:10px}
.control input{width:100%}
.control output{text-align:right;font-variant-numeric:tabular-nums}
.quiz-toolbar{display:flex;gap:8px;flex-wrap:wrap}
.quiz-card{margin-top:12px;background:rgba(255,249,252,.90);border:1px solid rgba(88,52,69,.14);border-radius:26px;padding:16px}
.quiz-card h2{font-size:15px;line-height:1.55;margin:0 0 10px}
.option{display:block;width:100%;text-align:left;border:1px solid rgba(88,52,69,.15);background:#fff;border-radius:16px;padding:12px;margin:7px 0;font-size:11px;line-height:1.45}
.option.correct{background:#e4f5e7;border-color:#8bb698}
.option.wrong{background:#fde5ea;border-color:#d48ea5}
.feedback{margin-top:10px;padding:12px;border-radius:16px;background:rgba(244,219,231,.62);font-size:11px;line-height:1.55}
.progress-line{height:8px;border-radius:999px;background:rgba(60,42,51,.12);overflow:hidden;margin:8px 0}
.progress-line span{display:block;height:100%;background:#cf7da4;width:0}
.source-card{background:#2d272c;color:#f8edf3;border-left:4px solid #e5a7c3;border-radius:5px 18px 18px 5px;padding:12px;margin:8px 0}
.source-card h3{font-size:12px;margin:0 0 6px}
.source-card p{font-size:10px;opacity:.74;margin:0 0 8px}
.source-card a{color:#ffcde2;font-size:10px;word-break:break-word}
.badges{display:flex;gap:5px;flex-wrap:wrap;margin:6px 0}
.badge{font-size:8px;border:1px solid rgba(255,255,255,.25);padding:4px 6px;border-radius:999px}
.video-card{background:rgba(255,250,252,.86);border-radius:24px;padding:12px;margin:10px 0;border:1px solid rgba(88,52,69,.14)}
.video-card iframe{display:block;width:100%;aspect-ratio:16/9;border:0;border-radius:18px;background:#2d252b}
.video-card h3{font-size:12px;margin:10px 0 5px}
.video-card p{font-size:10.5px;line-height:1.5;margin:0}
.scrapbook{background:rgba(255,252,253,.82);border:1px solid rgba(91,55,72,.1);padding:16px;border-radius:26px;position:relative}
.scrapbook::before{content:"♡ ♡ ♡ ♡ ♡ ♡";position:absolute;top:-10px;left:15px;right:15px;color:#e8a9c5;letter-spacing:10px;text-align:center;font-size:20px}
.scrapbook h2{font-family:Georgia,serif;font-style:italic;margin:10px 0 8px}
.scrapbook p{font-size:11px;line-height:1.7}
.theme-pills{display:flex;gap:6px;flex-wrap:wrap}
.theme-pills button{border:1px solid rgba(90,55,72,.15);background:rgba(255,255,255,.76);border-radius:999px;padding:8px 10px;font-size:10px}
@media (min-width:700px){
  .view{padding-left:max(18px,calc((100vw - 760px)/2));padding-right:max(18px,calc((100vw - 760px)/2))}
}