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var(--color-border);border-radius:var(--radius-md);padding:var(--space-24);margin-bottom:var(--space-32)}.series-nav-header{display:flex;align-items:baseline;gap:var(--space-8);flex-wrap:wrap;margin-bottom:var(--space-16)}.series-nav-label{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--color-accent);font-weight:600}.series-nav-title{font-size:var(--text-base);font-weight:600;color:var(--color-text-primary)}.series-nav-count{font-size:var(--text-sm);color:var(--color-text-tertiary);margin-left:auto}.series-nav-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:2px}.series-nav-item{display:flex;align-items:center;gap:var(--space-12);padding:8px 12px;font-size:var(--text-sm);color:var(--color-text-secondary);text-decoration:none;border-radius:var(--radius-sm);transition:background var(--duration-fast),color var(--duration-fast)}a.series-nav-item:hover{background:var(--color-bg-primary);color:var(--color-text-primary)}.series-nav-item-active{color:var(--color-accent);font-weight:500;background:var(--color-bg-primary)}.series-nav-number{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;font-size:var(--text-xs);font-weight:600;border-radius:50%;background:var(--color-border);color:var(--color-text-secondary);flex-shrink:0}.series-nav-item-active .series-nav-number{background:var(--color-accent);color:white}.newsletter-signup{position:relative;margin-top:var(--space-48);border-radius:var(--radius-xl);background:var(--bg-secondary);overflow:hidden;text-align:center}.newsletter-content{padding:var(--space-40) var(--space-32)}.newsletter-icon{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:var(--radius-lg);background:var(--fill-tertiary);color:var(--accent);margin-bottom:var(--space-16)}.newsletter-title{font-size:1.35rem;margin-bottom:var(--space-8);letter-spacing:-.01em}.newsletter-desc{font-size:.92rem;line-height:1.55;margin-bottom:var(--space-24);max-width:380px;margin-left:auto;margin-right:auto}.newsletter-form{max-width:460px;margin:0 auto}.newsletter-input-wrapper{display:flex;gap:var(--space-8);padding:5px;background:var(--bg-primary);border:1px solid var(--separator-opaque);border-radius:var(--radius-lg);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.newsletter-input-wrapper:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,102,204,.12)}[data-theme=dark] .newsletter-input-wrapper:focus-within{box-shadow:0 0 0 3px rgba(10,132,255,.2)}.newsletter-input{flex:1 1;padding:.65rem .85rem;border:none;background:transparent;color:var(--text-primary);font-size:.9rem;outline:none;min-width:0}.newsletter-input::placeholder{color:var(--text-tertiary)}.newsletter-btn{display:inline-flex;align-items:center;gap:6px;padding:.65rem 1.3rem;background:var(--accent);color:white;border:none;border-radius:var(--radius-md);font-size:.875rem;font-weight:600;cursor:pointer;white-space:nowrap;transition:background var(--transition-fast),transform var(--transition-fast)}.newsletter-btn:hover{background:var(--accent-hover);transform:translateY(-1px)}.newsletter-btn:active{transform:translateY(0)}.newsletter-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}.newsletter-btn-loading svg{animation:newsletter-spin .8s linear infinite}@keyframes newsletter-spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.newsletter-error{color:var(--color-red);font-size:.83rem;margin-top:var(--space-8);text-align:left;padding-left:var(--space-4)}.newsletter-privacy{font-size:.78rem;margin-top:var(--space-12)}.newsletter-success .newsletter-content{padding:var(--space-40) var(--space-32);animation:newsletter-fadein .4s ease-out}@keyframes newsletter-fadein{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.newsletter-success-icon{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:var(--radius-full);background:rgba(0,102,204,.08);color:var(--accent);margin-bottom:var(--space-16);animation:newsletter-pop .5s var(--transition-spring)}[data-theme=dark] .newsletter-success-icon{background:rgba(10,132,255,.15)}@keyframes newsletter-pop{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.newsletter-success-title{font-size:1.35rem;margin-bottom:var(--space-12);letter-spacing:-.01em}.newsletter-success-email{display:inline-block;font-size:.85rem;font-weight:500;color:var(--text-secondary);background:var(--fill-tertiary);padding:6px 16px;border-radius:var(--radius-full);margin-bottom:var(--space-12)}.newsletter-success-text{font-size:.9rem;line-height:1.5}@media (max-width:480px){.newsletter-content{padding:var(--space-32) var(--space-20)}.newsletter-input-wrapper{flex-direction:column}.newsletter-btn{justify-content:center}}