:root{--color-bg:#fff;--color-surface:#f8fafc;--color-text:#0a2348;--color-text-muted:#64718a;--color-border:#d5dde7;--color-border-strong:#9aaac0;--color-primary:#078eaa;--color-primary-strong:#056f89;--color-primary-soft:#eff9fb;--color-attention:#ef625d;--color-attention-soft:#fff4f2;--color-warning:#c98224;--color-success:#21845a;--font-display:"Songti SC",STSong,"Noto Serif SC",SimSun,serif;--font-body:Inter,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;--paper-margin:#f6c4c1;--paper-rule:#e5ebf1;--safe-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box}#app,body,html{min-height:100%;margin:0}body{background:var(--color-bg);color:var(--color-text);font-family:Inter,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:14px;line-height:1.57}button,input,select,textarea{font:inherit}a,button{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(7,152,165,.24)}.app-shell{min-height:100vh;background:#fff}.app-main{max-width:960px;margin:0 auto;padding:0 20px calc(88px + var(--safe-bottom))}.page-topbar{display:flex;min-height:76px;align-items:center;justify-content:space-between}.page-topbar h1{margin:0;font-size:24px;line-height:32px}.notification-dot{width:10px;height:10px;border-radius:50%;background:var(--color-border)}.desktop-sidebar{display:none}.bottom-nav{position:fixed;z-index:10;right:0;bottom:0;left:0;min-height:calc(72px + var(--safe-bottom));padding-bottom:var(--safe-bottom);border-top:1px solid var(--color-border);background:hsla(0,0%,100%,.96)}.nav-items{display:grid;grid-template-columns:repeat(var(--nav-count,5),1fr);height:72px}.nav-items a{display:flex;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;color:var(--color-text-muted);font-size:12px;font-weight:500}.nav-items a.router-link-exact-active{color:var(--color-primary);font-weight:700}.welcome-section{display:flex;align-items:center;gap:14px;padding:30px 0 26px}.welcome-section h2{margin:0;font-size:22px;line-height:30px}.sun-symbol{color:var(--color-warning);font-size:34px;line-height:1}.primary-button,.secondary-button{display:inline-flex;min-height:48px;align-items:center;justify-content:center;gap:8px;border-radius:16px;padding:0 20px;border:1.5px solid var(--color-primary);font-size:15px;font-weight:700;cursor:pointer}.primary-button{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.primary-button:hover{background:var(--color-primary-strong)}.primary-button:disabled{cursor:wait;opacity:.65}.secondary-button{color:var(--color-primary)}.create-lesson{width:100%}.content-section{padding-top:28px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.section-heading h2{margin:0;font-size:18px;line-height:26px}.empty-row,.section-heading a{color:var(--color-text-muted)}.empty-row{display:flex;min-height:76px;align-items:center;justify-content:center;border:1px solid var(--color-border);border-radius:14px}.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px}.quick-actions a{display:flex;min-height:72px;align-items:center;justify-content:center;gap:10px;border:1px solid var(--color-border);border-radius:14px;font-size:15px;font-weight:600}.profile-summary{display:flex;align-items:center;gap:16px;padding:24px 0}.profile-avatar{display:grid;width:56px;height:56px;place-items:center;border-radius:50%;background:var(--color-primary);color:#fff;font-size:22px;font-weight:700}.profile-summary h2,.profile-summary p{margin:0}.profile-summary p{color:var(--color-text-muted)}.open-list{overflow:hidden;border:1px solid var(--color-border);border-radius:14px}.list-row{display:flex;min-height:58px;align-items:center;gap:12px;padding:0 16px;border-bottom:1px solid var(--color-border)}.list-row:last-child{border-bottom:0}.list-row strong{margin-left:auto}.full-width{width:100%;margin-top:24px}.problem-state{display:flex;min-height:60vh;align-items:center;justify-content:center;flex-direction:column;gap:18px;text-align:center}.problem-state .app-icon{width:42px;height:42px;color:var(--color-primary)}.problem-state h2{margin:0;font-size:18px}.auth-page{display:grid;min-height:100vh;place-items:center;padding:24px 20px;background:#fff}.auth-panel{width:min(100%,420px)}.auth-brand{margin-bottom:40px;color:var(--color-text);font-size:28px;font-weight:800}.auth-panel h1{margin:0 0 24px;font-size:24px;line-height:32px}.auth-help{margin:-12px 0 24px;color:var(--color-text-muted)}.auth-notice{margin:-8px 0 20px;border-radius:12px;padding:12px 14px;background:var(--color-primary-soft);color:var(--color-text)}.auth-panel label{display:block;margin:16px 0 8px;color:var(--color-text);font-weight:600}.auth-panel input{width:100%;height:48px;border:1px solid var(--color-border);border-radius:12px;padding:0 14px;color:var(--color-text);background:var(--color-surface)}.auth-panel input:focus{border-color:var(--color-primary)}.auth-panel .primary-button{width:100%;margin-top:24px}.captcha-row{display:grid;grid-template-columns:1fr 120px;gap:12px}.captcha-image{height:48px;overflow:hidden;border:1px solid var(--color-border);border-radius:12px;background:#fff;cursor:pointer}.captcha-image img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover}.form-error{margin:14px 0 0;color:#b42318}.danger-link,.text-button{border:0;padding:8px;background:transparent;color:var(--color-primary);cursor:pointer;font-weight:700}.danger-link{color:#b42318}.page-caption{color:var(--color-text-muted);font-weight:600}.relation-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;padding:20px 0 24px}.relation-hero h2{max-width:520px;margin:4px 0 0;font-size:23px;line-height:1.35}.eyebrow{margin:0;color:var(--color-primary);font-weight:800;letter-spacing:.08em;text-transform:uppercase}.action-card,.share-card{margin:12px 0 20px;border:1px solid var(--color-border);border-radius:18px;padding:18px;background:var(--color-surface)}.action-card h2,.share-card h2{margin:0 0 6px;font-size:18px}.action-card>p{margin:0 0 16px;color:var(--color-text-muted)}.action-card label,.action-card 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