.teacher-join-page{background:#f6f8fb;color:#223750;min-height:100vh}
.teacher-join-page .join-topbar{height:82px;padding:0 max(28px,calc((100% - 1120px)/2));display:flex;align-items:center;justify-content:space-between;gap:24px;background:#fff;border-bottom:1px solid #e8edf3}
.teacher-join-page .join-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;white-space:nowrap}
.teacher-join-page .join-brand img{width:32px;height:32px;object-fit:contain}
.teacher-join-page .join-brand small{display:block;font-size:10px;font-weight:400;color:#8c99aa;letter-spacing:2px;margin-top:3px}
.teacher-join-page .join-topbar nav{display:flex;align-items:center;gap:24px;font-size:13px;color:#75859b}
.teacher-join-page #school-header-login{font-size:13px;border:1px solid #dfe6ef;border-radius:8px;min-height:38px;padding:8px 14px;color:#466386;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.teacher-join-page .school-app.join-page-main{max-width:1120px;padding:54px 28px 24px;margin:auto}
.teacher-join-page .join-page-title{margin-bottom:32px}
.teacher-join-page .join-eyebrow{font-size:11px;letter-spacing:1.5px;color:#7a8da4;margin:0 0 14px}
.teacher-join-page h1{font-size:30px;line-height:1.5;letter-spacing:.4px;font-weight:650;margin:0 0 12px}
.teacher-join-page .join-page-title>p:last-child{font-size:14px;color:#7b8b9f;line-height:1.9;margin:0}
.teacher-join-page .join-page-grid{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(0,1fr);gap:28px;align-items:start}
.teacher-join-page #teacher-join-main{min-width:0}
.teacher-join-page #teacher-join-main>.school-card{margin:0;background:#fff;padding:30px 32px;border:1px solid #e3eaf2;border-radius:16px;box-shadow:0 5px 24px #29436604}
.teacher-join-page .join-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
.teacher-join-page .join-card-head h2{font-size:19px;font-weight:650;line-height:1.5;margin:0}
.teacher-join-page .join-account-status{font-size:11px;color:#7c8b9e;background:#f2f5f9;border-radius:6px;padding:5px 9px;white-space:nowrap}
.teacher-join-page .join-account-status.is-logged{color:#397b62;background:#eff7f2}
.teacher-join-page .join-card-note{font-size:12px;color:#8491a3;line-height:1.9;margin:0 0 28px;overflow-wrap:anywhere}
.teacher-join-page [data-join-code]>label{font-size:13px;color:#526a86;font-weight:550;margin:0}
.teacher-join-page .join-code-field{display:flex;align-items:center;border:1px solid #d8e2ef;border-radius:10px;background:#fcfdff;margin-top:9px;transition:border-color .15s,box-shadow .15s;min-width:0}
.teacher-join-page .join-code-field:focus-within{border-color:#7398da;box-shadow:0 0 0 3px #3a70d512;background:#fff}
.teacher-join-page .join-code-field:has([aria-invalid=true]){border-color:#ce927d;box-shadow:0 0 0 3px #ce927d10}
.teacher-join-page .school-app .join-code-field input{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:14px;letter-spacing:.3px;min-width:0;flex:1;width:100%;border:0;border-radius:10px;background:transparent;outline:0;margin:0;padding:15px 14px;min-height:52px;color:#294466}
.teacher-join-page .join-code-field input::placeholder{font-family:system-ui,-apple-system,'PingFang SC',sans-serif;font-size:13px;color:#a0adbe;letter-spacing:0}
.teacher-join-page .join-code-field button{margin-right:7px;flex:none;background:transparent;border:0;padding:8px;color:#8b9ab0;font-size:12px;min-height:36px}
.teacher-join-page .join-field-hint{font-size:11px;color:#8b9aad;line-height:1.8;margin:9px 0 22px}
.teacher-join-page [data-join-code]>.primary{width:100%;min-height:46px;background:#2e63d8;border-color:#2e63d8;border-radius:9px;font-size:14px;font-weight:550;box-shadow:0 3px 10px #2e63d815}
.teacher-join-page .school-app button.primary:not(:disabled):hover{background:#2456c2;border-color:#2456c2}
.teacher-join-page .join-existing{border-top:1px solid #edf0f5;margin:26px 0 0;padding-top:20px;font-size:12px;color:#8a98aa;line-height:2}
.teacher-join-page .join-existing a{display:inline-block;color:#54759d;margin-left:4px}
.teacher-join-page .join-guide{padding:28px 26px;background:#f0f4f9;border:1px solid #e6ecf3;border-radius:16px}
.teacher-join-page .join-guide h2{font-size:15px;font-weight:600;margin:0 0 26px}
.teacher-join-page .join-guide ol{list-style:none;padding:0;margin:0}
.teacher-join-page .join-guide li{display:flex;gap:14px;margin:0 0 24px;position:relative}
.teacher-join-page .join-guide li>span{flex:none;width:27px;height:27px;display:grid;place-items:center;border:1px solid #d7e2ef;border-radius:50%;color:#6b87aa;background:#f8fafd;font-size:12px}
.teacher-join-page .join-guide h3{font-size:13px;font-weight:550;line-height:1.8;margin:0 0 4px}
.teacher-join-page .join-guide li p{font-size:12px;line-height:1.9;color:#8292a7;margin:0}
.teacher-join-page .join-help{border-top:1px solid #dfe6ef;padding-top:18px;font-size:12px;line-height:1.9;color:#8292a7}
.teacher-join-page .join-help summary{cursor:pointer;color:#67809e;line-height:1.9;min-height:30px}
.teacher-join-page .join-help p{margin:10px 0 0}
.teacher-join-page .join-safety{font-size:11px;line-height:1.9;color:#90a0b4;margin:16px 0 0}
.teacher-join-page .join-footer{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:11px;color:#9ba7b6;margin-top:28px;padding:0 4px;line-height:2}
.teacher-join-page [data-join-preview]:not(:empty){border-top:1px solid #e8edf4;margin-top:26px;padding-top:24px}
.teacher-join-page [data-join-preview] h3{font-size:16px;font-weight:600;line-height:1.8;margin:0 0 12px}
.teacher-join-page [data-join-preview] p{font-size:12px;color:#7488a1;line-height:1.9;margin:10px 0}
.teacher-join-page [data-join-preview] label:has([name=consent]){display:flex;align-items:flex-start;gap:8px;font-size:12px;line-height:1.9;padding:14px;background:#f7f9fc;border-radius:9px;margin:18px 0}
.teacher-join-page [name=consent]{flex:none;margin-top:4px;accent-color:#2e63d8}
.teacher-join-page [data-join-preview] .primary{width:100%;min-height:44px}
.teacher-join-page .school-app [role=alert]:empty{display:none}
.teacher-join-page .school-app [role=alert]:not(:empty){padding:11px 13px;border:1px solid #f0ddcf;background:#fff9f5;border-radius:8px;color:#a65c3c;font-size:12px;line-height:1.9;margin:14px 0 0;white-space:pre-wrap;overflow-wrap:anywhere}
.teacher-join-page :is(button,a,summary):focus-visible{outline:2px solid #7b9fdf;outline-offset:3px}
.teacher-join-page .school-account-wrap{position:relative}
.teacher-join-page .school-account-menu{position:absolute;right:0;top:calc(100% + 10px);z-index:10;width:240px;background:#fff;border:1px solid #e2e8f1;box-shadow:0 12px 36px #243b5512;border-radius:12px;padding:16px}
.teacher-join-page .school-account-menu :is(a,button){display:block;padding:10px 0;font-size:13px}
.teacher-join-page .school-account-identity{font-size:11px;color:#8d9db0;line-height:1.8}
@media(max-width:850px){.teacher-join-page .join-page-grid{grid-template-columns:1fr}.teacher-join-page .join-guide{padding:24px}.teacher-join-page .school-app.join-page-main{max-width:680px;padding-top:36px}}
@media(max-width:500px){.teacher-join-page .join-topbar{height:72px;padding:0 20px;gap:12px}.teacher-join-page .join-topbar nav{gap:12px;font-size:12px}.teacher-join-page .join-brand{font-size:17px}.teacher-join-page .join-brand img{width:27px;height:27px}.teacher-join-page #school-header-login{max-width:110px;padding:7px 10px;font-size:12px}.teacher-join-page .school-app.join-page-main{padding:30px 18px 24px}.teacher-join-page h1{font-size:25px}.teacher-join-page .join-page-title{margin-bottom:24px}.teacher-join-page #teacher-join-main>.school-card{padding:24px 20px;border-radius:13px}.teacher-join-page .join-card-head{align-items:flex-start;flex-wrap:wrap;gap:9px}.teacher-join-page .join-guide{border-radius:13px;padding:24px 20px}.teacher-join-page .join-field-hint{margin-bottom:18px}}
/* Homepage continuation: login first, then a focused invitation dialog. */
dialog.teacher-invite-dialog.teacher-join-page{min-height:0;width:640px;max-width:calc(100vw - 32px);max-height:calc(100dvh - 40px);overflow:auto;border:1px solid #e1e8f1;border-radius:18px;background:#fff;padding:30px;color:#223750;box-shadow:0 24px 90px #172b4833}
.teacher-invite-dialog::backdrop{background:#1b2d4966;backdrop-filter:blur(4px)}
.teacher-invite-dialog{text-align:left}
.teacher-invite-dialog .join-modal-kicker{text-align:center}
.teacher-invite-dialog .dialog-close{position:absolute;right:16px;top:14px;width:36px;height:36px;border:0;border-radius:50%;background:#f2f5f9;color:#8290a4;font-size:23px;display:grid;place-items:center;cursor:pointer}
.teacher-invite-dialog .join-modal-kicker{font-size:11px;letter-spacing:1.5px;color:#879ab0;margin:4px 42px 22px 2px}
.teacher-invite-dialog .school-app{padding:0;margin:0;max-width:none;font-family:inherit}
.teacher-invite-dialog #teacher-join-main>.school-card{border:0;padding:0;box-shadow:none;border-radius:0}
.teacher-invite-dialog .join-modal-note{padding-top:18px;border-top:1px solid #edf1f6;margin:22px 0 0;font-size:11px;line-height:1.9;color:#8d9db0}
.teacher-invite-dialog .primary,.teacher-join-page [data-join-login]{color:#fff;background:#2e63d8;border:1px solid #2e63d8;border-radius:9px;min-height:46px;width:100%;padding:11px 16px;font:inherit;font-size:14px;cursor:pointer}
.teacher-invite-dialog button{font-family:inherit;cursor:pointer}
.teacher-invite-dialog button:disabled{opacity:.55;cursor:wait}
.teacher-invite-dialog label{display:block}
.teacher-invite-dialog [name=consent]{width:17px;height:17px;margin-right:0}
.teacher-invite-dialog [data-join-preview] a{font-size:13px;color:#426caa;line-height:1.9}
@media(max-width:500px){dialog.teacher-invite-dialog.teacher-join-page{padding:26px 20px;max-width:calc(100vw - 20px);max-height:calc(100dvh - 24px);border-radius:14px}.teacher-invite-dialog #teacher-join-main>.school-card{padding:0}.teacher-invite-dialog .join-card-note{margin-bottom:22px}}