/* 芽芽启蒙官网 · PC 前台（严格按原型 v2.1 International 设计规范）
   衬线英文点缀 + 中英双语排版 · 期刊式研究背书 · 分区编号叙事 · 墨绿×琥珀×藏青 */
:root{--ink:#16211d;--teal:#0e7c66;--teal-d:#0a5c4c;--amber:#d9962e;--gold:#b9822a;
      --mut:#5f6d67;--bg:#fbfbf9;--line:#e5e9e6;--red:#b3502f;--navy:#1c3a4b;--serif:Georgia,"Times New Roman",serif;}
*{box-sizing:border-box;margin:0;padding:0;font-family:"Avenir Next",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;}
body{background:var(--bg);}
main{min-height:70vh;}
a{color:inherit;text-decoration:none;cursor:pointer;}
button{font:inherit;}
.topbar{height:64px;display:flex;align-items:center;padding:0 48px;gap:30px;font-size:13px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;}
.logo{font-size:19px;font-weight:800;color:var(--teal);letter-spacing:.5px;}
.logo small{display:block;font-size:8px;letter-spacing:3px;color:var(--mut);font-weight:500;}
.topbar .grow{flex:1;}
.btn{display:inline-block;background:var(--teal);color:#fff;border-radius:22px;padding:11px 28px;font-size:13px;font-weight:700;cursor:pointer;border:0;}
.btn:disabled{opacity:.5;cursor:not-allowed;}
.btn2{display:inline-block;background:transparent;color:var(--teal-d);border:1.5px solid var(--teal);border-radius:22px;padding:10px 26px;font-size:13px;cursor:pointer;}
.kicker{font-size:11px;letter-spacing:4px;color:var(--amber);font-weight:700;text-transform:uppercase;}
.en-serif{font-family:var(--serif);}
.band{padding:76px 48px;}
.band h1{font-size:40px;line-height:1.3;letter-spacing:.5px;font-weight:800;}
.band h2{font-size:26px;margin-bottom:20px;font-weight:800;letter-spacing:.5px;}
.band p.lead{color:var(--mut);font-size:15px;margin-top:14px;line-height:2;}
.num{font-family:var(--serif);font-size:52px;font-weight:700;color:var(--teal-d);}
.card{border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff;}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.chip{display:inline-block;background:#eef4f1;color:var(--teal-d);border-radius:12px;padding:3px 12px;font-size:11px;margin:2px 4px 2px 0;}
.chipA{background:#faf1de;color:#9a6716;}
table{width:100%;border-collapse:collapse;font-size:12px;}
th{background:#f4f6f5;text-align:left;padding:10px 12px;color:var(--mut);font-weight:600;}
td{padding:10px 12px;border-top:1px solid var(--line);}
.price{font-size:28px;font-weight:800;color:var(--red);}
.price .sub,.sub{color:var(--mut);font-size:13px;font-weight:400;}
.old{color:var(--mut);text-decoration:line-through;font-size:13px;margin-left:6px;}
.footer{background:var(--ink);color:#8fa39b;padding:44px 48px;font-size:11px;line-height:2.2;margin-top:0;}
.footer b{color:#cfe0da;}
.footer .cols{display:flex;gap:60px;flex-wrap:wrap;}
.ref{font-size:12px;color:var(--mut);line-height:2;}
.sec-no{font-family:var(--serif);color:var(--amber);font-size:14px;letter-spacing:2px;}
.hr{width:44px;height:3px;background:var(--amber);border-radius:2px;margin:14px 0;}
.selrow span{display:inline-block;border:1.5px solid var(--line);border-radius:10px;padding:9px 18px;font-size:12px;margin:4px 8px 0 0;cursor:pointer;}
.selrow .on{border-color:var(--teal);color:var(--teal);font-weight:700;background:#f0f7f4;}
.gallery{height:400px;border-radius:16px;background:linear-gradient(135deg,#edf5f1,#fbf3e2);display:flex;align-items:center;justify-content:center;font-size:110px;}
.trust{display:flex;gap:26px;align-items:center;color:var(--mut);font-size:12px;}
.page{padding:32px 48px;}
.tabs{display:flex;gap:6px;border-bottom:2px solid var(--line);font-size:13px;}
.tabs span{padding:12px 20px;color:var(--mut);cursor:pointer;}
.tabs span.on{border-bottom:2px solid var(--teal);color:var(--teal);font-weight:700;margin-bottom:-2px;}
input,select,textarea{border:1.5px solid var(--line);border-radius:10px;padding:11px;font-size:13px;background:#fff;width:100%;}
.okbox{background:#f2f7f4;border-radius:12px;padding:12px 16px;font-size:12px;color:var(--teal-d);}
.alertbox{background:#fdf8ec;border:1px solid #f0e3c0;border-radius:12px;padding:12px 16px;font-size:12px;color:#9a6716;}
.stopbox{background:#f9ece7;border:1px solid #ecc5b5;border-radius:12px;padding:12px 16px;font-size:12px;color:var(--red);}
.modal-mask{position:fixed;inset:0;background:rgba(22,33,29,.45);z-index:50;display:flex;align-items:center;justify-content:center;}
.modal{background:#fff;border-radius:16px;padding:30px;width:400px;}
.pcard-thumb{width:76px;height:76px;border-radius:12px;background:#eef1f0;display:flex;align-items:center;justify-content:center;font-size:34px;cursor:pointer;}
.pimg{width:100%;height:100%;object-fit:contain;display:block}
.ptile{height:150px;border-radius:10px;background:linear-gradient(135deg,#edf5f1,#fbf3e2);display:flex;align-items:center;justify-content:center;overflow:hidden}
.pcard-thumb.on{border:2px solid var(--teal);background:#edf5f1;}