:root{--color-primary: #4f6ef7;--color-primary-dark: #3d55d6;--color-bg: #f6f7fb;--color-surface: #ffffff;--color-border: #e4e7f0;--color-text: #1c2130;--color-muted: #6b7280;--color-success: #1f9d55;--color-warning: #d97706;--color-danger: #dc2626;--color-info: #2563eb;--radius: 14px;--radius-sm: 10px;--shadow: 0 1px 3px rgba(16, 24, 40, .08);--shadow-lg: 0 6px 24px rgba(16, 24, 40, .14);--safe-bottom: env(safe-area-inset-bottom, 0px);--nav-h-mobile: 62px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}#root{min-height:100vh}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.brand{display:flex;align-items:center;gap:8px;font-weight:700}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;background:var(--color-primary);color:#fff;font-size:15px}.brand-name{font-size:16px}.top-nav{display:none;align-items:center;gap:4px}.top-nav-link{padding:8px 12px;border-radius:8px;color:var(--color-muted);text-decoration:none;font-size:14px;font-weight:500}.top-nav-link.active{color:var(--color-primary);background:#4f6ef71a}.app-main{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:16px 16px calc(var(--nav-h-mobile) + var(--safe-bottom) + 20px)}.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;background:var(--color-surface);border-top:1px solid var(--color-border);padding-bottom:var(--safe-bottom)}.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:8px 4px calc(8px + env(safe-area-inset-bottom,0px));min-height:var(--nav-h-mobile);color:var(--color-muted);text-decoration:none;font-size:11px;border:none;background:none;cursor:pointer}.bottom-nav-item.active{color:var(--color-primary);font-weight:600}.bottom-nav-icon{font-size:18px;line-height:1}.bottom-nav-item.bottom-nav-signout{color:var(--color-danger)}.page{display:flex;flex-direction:column;gap:16px}.page-head{display:flex;flex-direction:column;gap:2px}.page-title{margin:0;font-size:22px;font-weight:700}.page-sub{margin:0;color:var(--color-muted);font-size:14px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 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.15s}.btn:active{filter:brightness(.95)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-secondary{background:#4f6ef71a;color:var(--color-primary)}.btn-ghost{background:transparent;color:var(--color-muted);border-color:var(--color-border)}.btn-danger{background:var(--color-danger);color:#fff}.btn-block{width:100%}.btn-small{min-height:auto;padding:6px 12px;font-size:13px}.form{display:flex;flex-direction:column;gap:14px}.field{display:flex;flex-direction:column;gap:6px;margin:0;padding:0;border:none}.field-label{font-size:13px;font-weight:600;color:var(--color-muted);padding:0}.field-note{margin:-6px 0 0;font-size:12px;color:var(--color-muted)}.input,select.input{width:100%;min-height:44px;padding:10px 12px;font-size:16px;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm)}.input:focus{outline:2px solid rgba(79,110,247,.4);border-color:var(--color-primary)}.input-compact{min-height:36px;padding:4px 8px;font-size:14px}.form-actions{display:flex;gap:10px;margin-top:4px}.form-actions-wrap{flex-wrap:wrap}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;background:var(--color-bg);border:1px solid var(--color-border);border-radius:20px;font-size:14px;cursor:pointer;-webkit-user-select:none;user-select:none}.chip input{accent-color:var(--color-primary)}.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}.list-item{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid 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ease}.toast-info,.toast-action{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border)}@keyframes slide-up{0%{transform:translateY(16px);opacity:0}to{transform:translateY(0);opacity:1}}.global-error-banner{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;font-size:14px;font-weight:500;animation:slide-down .2s ease}.global-error-banner-error{background:var(--color-danger);color:#fff}.global-error-banner-warning{background:var(--color-warning);color:#fff}.global-error-banner-info{background:var(--color-info);color:#fff}.global-error-banner-unauthorized{background:#7c3aed;color:#fff}.global-error-content{display:flex;align-items:center;gap:8px;min-width:0}.global-error-icon{flex-shrink:0;font-size:16px}.global-error-message{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.global-error-close{flex-shrink:0;border:none;background:#fff3;color:#fff;width:28px;height:28px;border-radius:50%;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}.global-error-close:hover{background:#ffffff59}@keyframes slide-down{0%{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}.toast-container{position:fixed;right:16px;bottom:calc(var(--nav-h-mobile) + var(--safe-bottom) + 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0;opacity:.85}.chart-x{display:flex;justify-content:space-between;margin-top:4px;font-size:11px;color:var(--color-muted)}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(160deg,#eef2ff,#f6f7fb)}.login-card{width:100%;max-width:400px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:24px;display:flex;flex-direction:column;gap:18px}.login-brand{text-align:center}.login-brand .brand-mark{width:48px;height:48px;font-size:24px;border-radius:14px;margin-bottom:8px}.login-brand h1{margin:8px 0 4px;font-size:22px}.login-sub{margin:0;color:var(--color-muted);font-size:14px}.login-hint{margin:0;font-size:13px;color:var(--color-muted);text-align:center}.profile-detail{width:100%;padding-top:10px}.dl{display:grid;grid-template-columns:1fr 1fr;gap:10px 16px;margin:0}.dl dt{font-size:12px;color:var(--color-muted)}.dl dd{margin:0;font-size:14px}.quick-actions{display:flex;flex-direction:column;gap:10px}@media (min-width: 600px){.app-main{padding:20px 24px calc(20px + var(--safe-bottom))}.grid-2{grid-template-columns:1fr 1fr}.progress-controls{flex-direction:row;align-items:flex-end;justify-content:space-between}.progress-controls .field{flex:1;max-width:280px}.quick-actions{flex-direction:row;flex-wrap:wrap}}@media (min-width: 900px){.top-nav{display:flex}.bottom-nav{display:none}.app-main{padding-bottom:40px}.page-title{font-size:26px}}@media (prefers-color-scheme: dark){:root{--color-bg: #0f1117;--color-surface: #1a1d27;--color-border: #2a2e3c;--color-text: #e8eaf2;--color-muted: #9aa0b0}.top-nav-link.active,.btn-secondary{background:#4f6ef733}.tag-draft{background:#2a2e3c}.avatar{background:#4f6ef740}.chip,.segmented{background:#0f1117}}.child-shell{min-height:100vh;display:flex;flex-direction:column}.child-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.child-brand{display:flex;align-items:center;gap:10px;min-width:0}.child-avatar{flex-shrink:0;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;background:#ffffff40}.child-brand-text{display:flex;flex-direction:column;min-width:0}.child-name{font-size:18px;font-weight:800;line-height:1.1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.child-profile{font-size:12px;opacity:.85}.child-exit{flex-shrink:0;border:none;background:none;font-size:14px;font-weight:700;padding:8px 6px;border-radius:10px;cursor:pointer;opacity:.9}.child-nav{position:sticky;top:65px;z-index:20;display:flex;gap:8px;padding:8px 16px}.child-nav-item{display:flex;align-items:center;gap:8px;padding:12px 16px;border-radius:16px;text-decoration:none;font-weight:700;font-size:15px;min-height:48px;opacity:.85}.child-nav-item.active{opacity:1}.child-main{flex:1;width:100%;max-width:720px;margin:0 auto;padding:8px 16px 32px}.child-page{display:flex;flex-direction:column;gap:16px}.child-page-head{display:flex;flex-direction:column;gap:2px;padding:4px 0}.child-page-title{margin:0;font-size:24px;font-weight:800}.child-page-sub{margin:0;font-size:15px;opacity:.85}.child-tasks{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.child-task-card{width:100%;display:flex;align-items:center;gap:14px;padding:16px;border:none;border-radius:18px;text-align:left;cursor:pointer;font-family:inherit;box-shadow:var(--shadow);transition:transform .12s ease,box-shadow .12s ease}.child-task-card:active{transform:scale(.98)}.child-task-emoji{flex-shrink:0;font-size:30px}.child-task-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.child-task-title{font-weight:800;font-size:16px}.child-task-sub{font-size:13px;opacity:.8}.child-task-arrow{flex-shrink:0;font-size:24px;opacity:.6}.child-back{align-self:flex-start;border:none;background:none;font-size:15px;font-weight:700;padding:6px 0;cursor:pointer;opacity:.9}.child-question-card{padding:18px;border-radius:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px}.child-question{margin:0;font-size:19px;font-weight:700;line-height:1.4}.child-question-tag{align-self:flex-start;padding:4px 10px;border-radius:14px;font-size:12px;font-weight:700}.pronounce{display:inline-flex;align-items:center;gap:8px;margin-top:2px}.pronounce-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;padding:0;border:none;border-radius:50%;background:#ffffffe6;box-shadow:var(--shadow);color:var(--color-text);font-size:15px;line-height:1;cursor:pointer;transition:transform .12s ease,opacity .12s ease}.pronounce-btn:hover:not(:disabled){transform:translateY(-1px)}.pronounce-btn:disabled{opacity:.55;cursor:default}.pronounce-transcription,.pronounce-error{font-size:15px;font-style:italic}.pronounce-error{color:var(--color-danger)}.child-hint-bar{display:flex;flex-direction:column;gap:8px}.child-hint-btn{align-self:flex-start;display:inline-flex;align-items:center;gap:8px;padding:12px 16px;border:none;border-radius:14px;font-size:15px;font-weight:700;cursor:pointer;min-height:48px}.child-hint-btn:disabled{opacity:.5;cursor:not-allowed}.child-hint-count{font-size:12px;font-weight:600;padding:2px 8px;border-radius:12px;opacity:.9}.child-hint-text{margin:0;padding:12px 14px;border-radius:14px;font-size:15px;line-height:1.4}.child-answer{display:flex;flex-direction:column;gap:14px}.child-options{display:flex;flex-direction:column;gap:12px}.child-options-tf{display:grid;grid-template-columns:1fr 1fr;gap:12px}.child-option{min-height:56px;padding:14px 16px;border:2px solid transparent;border-radius:16px;font-size:17px;font-weight:700;text-align:center;cursor:pointer;transition:transform .1s ease}.child-option:active{transform:scale(.97)}.child-option.selected{border-color:currentColor;box-shadow:0 0 0 2px #fff6 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