:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:#343a40;font-synthesis:none;text-rendering:optimizelegibility;--color-canvas:#f3efe6;--color-paper:#fffdf8;--color-ink:#18261f;--color-text:#3e413c;--color-muted:#6c6b63;--color-rule:#d8d0c1;--color-rule-strong:#9e978a;--color-action:#284f3e;--color-action-hover:#17392b;--color-accent:#9a5938;--color-success:#316044;--color-success-soft:#e6efe8;--color-warning:#7a552c;--color-warning-soft:#f4eadb;--color-error:#873a35;--color-error-soft:#f5e7e4;--font-display:"Noto Serif TC", "Songti TC", Georgia, serif;--font-body:"Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--radius-control:.625rem;--radius-surface:.75rem;--radius-card:var(--radius-surface);--color-paper-deep:#ebe5d9;--focus-ring:0 0 0 3px 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var(--color-rule);min-height:5.25rem;display:flex}.wordmark{color:var(--color-ink);font-family:var(--font-display);letter-spacing:.08em;white-space:nowrap;align-items:center;gap:.5rem;font-size:1.35rem;font-weight:700;text-decoration:none;display:inline-flex}.brand-icon{object-fit:contain;flex-shrink:0;width:1.85rem;height:1.85rem;display:block;transform:translateY(1px)}.site-header nav{align-items:center;gap:var(--space-6);display:flex}.site-header nav a{color:var(--color-text);font-size:.9375rem;text-decoration:none}.site-header nav a:hover{color:var(--color-action)}.account-menu{align-items:center;gap:var(--space-3);min-width:0;margin-left:auto;display:flex}.account-menu span{max-width:15rem;color:var(--color-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.8125rem;overflow:hidden}.button{min-height:2.75rem;padding:.625rem var(--space-4);border:1px solid var(--color-action);border-radius:var(--radius-control);background:var(--color-action);color:#fff;cursor:pointer;text-align:center;box-sizing:border-box;justify-content:center;align-items:center;font-weight:700;text-decoration:none;transition:background .2s,border-color .2s,transform .2s cubic-bezier(.16,1,.3,1),box-shadow .2s cubic-bezier(.16,1,.3,1);display:inline-flex;box-shadow:0 2px 8px #284f3e1a}.button:hover{border-color:var(--color-action-hover);background:var(--color-action-hover);transform:translateY(-1.5px);box-shadow:0 4px 16px #284f3e33}.button:active{transform:translateY(1px)scale(.99);box-shadow:0 1px 4px #284f3e1f}.button-quiet{border-color:var(--color-rule);color:var(--color-ink);box-shadow:none;background:0 0}.button-quiet:hover{border-color:var(--color-rule-strong);background:var(--color-paper);transform:translateY(-1px);box-shadow:0 2px 8px 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#18261f0a}.surface-card>.overline,.surface-card>.eyebrow{margin:0}.surface-card>h1{color:var(--color-ink);margin:0;font-size:clamp(1.85rem,4.5vw,2.75rem);line-height:1.25}.surface-card>p{margin:0;line-height:1.6}.eyebrow,.overline{margin:0 0 var(--space-2);color:var(--color-accent);letter-spacing:.12em;text-transform:uppercase;font-size:.75rem;font-weight:800}.muted{color:var(--color-muted)}.child-identity{justify-content:space-between;align-items:end;gap:var(--space-6);display:flex}.child-switcher{gap:var(--space-2);color:var(--color-muted);font-size:.8125rem;font-weight:700;display:grid}.child-switcher select{min-height:2.75rem;padding:var(--space-2) var(--space-3);border:1px solid var(--color-rule-strong);border-radius:var(--radius-control);background:var(--color-paper);color:var(--color-ink)}.material-history{border-top:1px solid var(--color-rule)}.material-history-item{padding-block:var(--space-8);border-bottom:1px solid 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.6rem;font-size:.8125rem;font-weight:800}.detail-date{color:var(--color-muted);font-size:.875rem}.detail-reading-status{align-items:center;gap:var(--space-2);display:inline-flex}.detail-reading-label{color:var(--color-muted);font-size:.8125rem}.detail-reading-badge{color:var(--color-ink);background:var(--color-paper);border:1px solid var(--color-rule);border-radius:4px;padding:.15rem .5rem;font-size:.8125rem;font-weight:700}.detail-card-body{gap:var(--space-3);display:grid}.detail-vocab-summary{align-items:center;gap:var(--space-2);color:var(--color-text);font-size:.9375rem;display:flex}.detail-vocab-icon{font-size:1.1rem}.detail-section{gap:var(--space-1);padding:var(--space-3);border-radius:var(--radius-control);background:var(--color-paper);border:1px solid var(--color-rule);display:grid}.detail-improvements{border-left:3px solid var(--color-success)}.detail-next-review{border-left:3px solid 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.button{margin-left:auto}.status-waitlist{border-left-color:var(--color-warning)}.billing-layout{gap:clamp(var(--space-8), 5vw, var(--space-12));margin-block:var(--space-8);grid-template-columns:1fr;align-items:start;display:grid}.billing-layout.has-active-checkout{grid-template-columns:minmax(20rem,1fr) minmax(22rem,1.2fr)}.subscription-list{gap:var(--space-6);grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));align-items:stretch;display:grid}.subscription-card{padding:var(--space-6);border:1px solid var(--color-rule);border-radius:var(--radius-card);background:var(--color-paper);flex-direction:column;justify-content:space-between;display:flex;box-shadow:0 1px 3px #0000000a}.subscription-card-body{gap:var(--space-3);flex-direction:column;display:flex}.subscription-card h2{margin-top:var(--space-1);margin-bottom:var(--space-2)}.subscription-action{padding-top:var(--space-4);border-top:1px solid var(--color-rule);margin-top:auto}.subscription-action 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