:root{font-family:'Microsoft YaHei','Noto Sans',Arial,sans-serif;color:#18345d;background:#f2f6fc}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}a{color:#225fb0}.shell{max-width:1300px;margin:auto;padding:18px}.header{background:#fff;border-bottom:1px solid #dce6f2;position:sticky;top:0;z-index:2}.header .shell{display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:44px;height:44px;object-fit:contain}.brand strong{font-size:23px;color:#174e99}.brand small{display:block;color:#71819c}.btn{background:#225fae;border:0;border-radius:11px;padding:11px 17px;color:white;font-weight:700}.btn.secondary{background:#e6eefb;color:#1c539b}.btn.danger{background:#b73548}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:#fff;border:1px solid #dce6f2;border-radius:18px;padding:22px;margin:16px 0;box-shadow:0 5px 22px #193b6b0b}.card h2{margin:0 0 14px}.hero{background:linear-gradient(115deg,#1f5eaf,#538acb);color:white;border-radius:18px;padding:26px;margin:18px 0}.hero h1{margin:0 0 8px}.muted{color:#687b98}.grid{display:grid;grid-template-columns:270px minmax(0,1fr);gap:18px}.sidebar{background:#fff;border:1px solid #dce6f2;border-radius:16px;padding:16px;align-self:start;max-height:75vh;overflow:auto}.lesson{width:100%;display:block;text-align:left;border:1px solid #dbe6f5;background:#fff;color:#234a7e;padding:11px;margin:6px 0;border-radius:10px}.lesson.active{background:#e4efff;border-color:#2467bc}.lesson:disabled{background:#f4f5f7;color:#8a94a6}.levels{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}.level{padding:9px 15px;background:#e7effa;border:0;border-radius:9px;color:#174e99}.level.active{background:#225fae;color:#fff}.tabs{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0}.tab{border:1px solid #d4e3f7;background:#fff;border-radius:9px;padding:9px 13px;color:#275a9e}.tab.active{background:#225fae;color:white}.line{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px;align-items:center;border-bottom:1px solid #e6ecf4;padding:13px 0}.zh{font-size:21px;font-weight:700}.py{color:#3669a8;margin-top:3px}.mn{color:#61738e;margin-top:5px}.pageGrid{display:grid;grid-template-columns:1fr 210px;gap:18px;align-items:start}.pageImage{width:100%;height:auto;max-width:100%;border:1px solid #e0e9f5;border-radius:12px}.pageGrid .pageImage{position:sticky;top:110px}.vocabGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}.vocab{border:1px solid #dce6f2;border-radius:12px;padding:14px}.field{display:flex;flex-direction:column;gap:6px;margin:10px 0;min-width:170px;flex:1}.field input,.field select{border:1px solid #cbd8e9;padding:12px;border-radius:10px;width:100%;background:white}.fields{display:flex;flex-wrap:wrap;gap:12px;align-items:end}.status{padding:12px 0;color:#22639f}.notice{border-left:4px solid #5589ce;background:#f1f6ff;padding:12px 15px;border-radius:7px}.video{width:100%;max-width:800px;border-radius:12px;background:#0e1930}.login{max-width:480px;margin:9vh auto}.listrow{padding:12px 0;border-bottom:1px solid #e5edf5;display:flex;justify-content:space-between;align-items:center;gap:12px}.listrow small{display:block;color:#71819c;margin-top:5px}.bookThumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}.bookThumbs img{width:100%;height:auto}.bookThumbs figcaption{font-size:13px}.bookThumbs figure{margin:0}.teacherNav{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}.teacherNav button{background:#e7effa;color:#20589e;border:0;padding:12px;border-radius:10px;font-weight:700}.teacherNav button.active{background:#205fae;color:#fff}.answer{padding:12px;border:1px solid #cad8ec;border-radius:10px;background:#fff;margin:6px}.error{color:#bb3148}.success{color:#18704a}@media(max-width:760px){.grid,.pageGrid{grid-template-columns:1fr}.sidebar{max-height:290px}.pageGrid .pageImage{position:static}.shell{padding:12px}.brand strong{font-size:19px}.card{padding:15px}.zh{font-size:19px}}
.recorder{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:14px 0}.recorder audio{width:100%;max-width:500px}

/* V20 mobile-first bilingual login inspired by the user's reference */
.loginPage{background:#f7f9fa;color:#171b20;min-height:100vh}.loginWrap{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}.loginCard{width:min(100%,480px);border:1px solid #e0e2e4;background:white;border-radius:28px;padding:26px 26px 30px;box-shadow:0 12px 40px #12304a0a;text-align:center}.loginBanner{background:linear-gradient(110deg,#287e88,#176070);border-radius:20px;padding:18px;min-height:140px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:14px;color:#fff;font-weight:700;letter-spacing:.4px}.loginBanner img{max-width:260px;width:100%;background:#fff;border-radius:12px;padding:10px}.loginCard h1{font-size:30px;letter-spacing:-1px;margin:22px 0 4px}.loginSubtitle{color:#707070;font-size:16px;margin:0 0 23px}.loginCard .field{text-align:left;font-size:16px;font-weight:600;color:#656565;margin:16px 0}.loginCard .field input{border:0;background:#f0f1f2;border-radius:17px;padding:18px 20px;font-size:18px;color:#151515;min-height:59px}.loginCard .field input:focus{outline:2px solid #277d8b}.loginSubmit{width:100%;background:#e8e9eb;color:#161616;border:0;border-radius:18px;font-size:19px;font-weight:800;min-height:60px;margin-top:9px}.loginSubmit:hover{background:#d8e7e9}.loginHint{font-size:13px;color:#777;line-height:1.7}.teacherNav button{min-height:44px}.miniBadge{display:inline-block;border-radius:8px;background:#e6f3f1;color:#176a62;padding:5px 9px;font-size:12px}.twoCol{display:grid;grid-template-columns:1fr 1fr;gap:14px}.toolbarRow{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.rowItem{border:1px solid #e1e8ef;border-radius:13px;padding:14px;margin:10px 0}.rowItem small{display:block;color:#71819c}.teacherTextArea{min-height:100px;width:100%;border:1px solid #cad7e6;border-radius:10px;padding:12px;font:inherit}.audioPlayer{max-width:100%;width:330px}.published{color:#137755}.draft{color:#a05b1a}@media(max-width:640px){.loginWrap{padding:10px}.loginCard{padding:20px 18px}.loginCard h1{font-size:27px}.twoCol{grid-template-columns:1fr}}

/* V21: user-approved full-screen Gegee Spirit login artwork.
   This applies ONLY to the login page, not the teacher/student dashboards. */
.loginPage{background:#0a6272;color:#152f38;min-height:100vh;min-height:100dvh;isolation:isolate}
.loginPage::before{content:"";position:fixed;z-index:-2;inset:0;background:#0a6272 url('/assets/login-cover.webp') center center / cover no-repeat}
.loginPage::after{content:"";position:fixed;z-index:-1;inset:0;background:linear-gradient(90deg,rgba(3,36,51,.08),rgba(3,37,53,.14) 50%,rgba(3,36,51,.05));pointer-events:none}
.loginWrap{min-height:100vh;min-height:100dvh;padding:32px 20px;align-items:center;justify-content:center}
.loginCard{width:min(100%,440px);background:rgba(255,255,255,.24);border:1px solid rgba(255,255,255,.8);border-radius:26px;padding:34px 34px 25px;box-shadow:0 12px 36px rgba(0,35,48,.19);backdrop-filter:none;-webkit-backdrop-filter:none;text-align:left}
.loginBrand{display:flex;gap:13px;align-items:center;justify-content:center}
.loginBrand img{width:50px;height:50px;object-fit:contain;border-radius:12px;background:white}
.loginEyebrow{display:block;color:#237d86;font-size:11px;letter-spacing:1.7px;font-weight:800}
.loginCard h1{margin:1px 0 0;font-size:30px;letter-spacing:-.6px;color:#0d3847;line-height:1.15}
.loginSubtitle{color:#101010;text-align:center;font-size:15px;margin:13px 0 24px}
.loginCard .field{font-size:15px;color:#2a4c55;font-weight:700;margin:15px 0 18px;gap:8px}
.loginCard .field input{background:rgba(245,250,251,.83);border:1px solid #d1e2e5;border-radius:13px;min-height:56px;padding:14px 16px;font-size:17px;color:#12333a}
.loginCard .field input:focus-visible{outline:3px solid #4eb6c2;outline-offset:1px}
.loginSubmit{display:flex;justify-content:center;align-items:center;gap:12px;background:#086e7b;color:#fff;border:0;border-radius:13px;min-height:58px;font-size:18px;font-weight:800;margin-top:6px;box-shadow:0 8px 20px rgba(8,110,123,.2)}
.loginSubmit:hover{background:#075a66}.loginSubmit:focus-visible{outline:3px solid #4eb6c2;outline-offset:3px}
.loginCard .status{font-size:14px;min-height:22px;padding:6px 0 0;margin:0;color:#9b3030}
.loginHint{color:#101010;text-align:center;font-size:12px;line-height:1.8;margin:12px 0 0}
@media(min-width:1100px){.loginWrap{justify-content:center;padding-left:7vw}.loginCard{transform:translateX(2vw)}}
@media(max-width:640px){
  .loginPage::before{background-image:url('/assets/login-cover-mobile.webp');background-position:center top;background-size:cover}
  .loginPage::after{background:linear-gradient(180deg,transparent 0%,rgba(0,54,69,.02) 22%,rgba(0,42,55,.14) 100%)}
  .loginWrap{display:block;min-height:100dvh;padding:clamp(220px,29vh,315px) 14px 25px}
  .loginCard{transform:none;width:100%;max-width:430px;margin:0 auto;border-radius:23px;padding:25px 23px 20px;background:rgba(255,255,255,.30)}
  .loginCard h1{font-size:27px}.loginSubtitle{font-size:13px;margin-bottom:20px}
  .loginCard .field{margin:13px 0}.loginCard .field input{min-height:52px}
  .loginSubmit{min-height:55px}
}
@media(max-width:360px){.loginWrap{padding-top:190px}.loginCard{padding:20px 17px}.loginBrand img{width:40px;height:40px}.loginCard h1{font-size:25px}}
@media(prefers-reduced-motion:reduce){.loginSubmit{transition:none}}