.main-bottom-pad{padding-bottom:64px}.tool-hero{text-align:center;padding:64px 20px 32px}.tool-hero h1{font-family:var(--font-headline);font-size:var(--text-headline-xl);font-weight:700;color:var(--color-on-background);margin:0 0 16px}.tool-hero .hero-sub{font-size:var(--text-body-lg);color:var(--color-secondary);max-width:42rem;margin:0 auto 32px}.tool-section{padding:0 0 48px}.tool-container{width:100%;max-width:740px;margin:0 auto}.i64-upload-zone{padding:48px 20px;border:2px dashed var(--color-outline-variant);border-radius:var(--radius-xl);text-align:center;cursor:pointer;transition:all var(--transition-fast);background:var(--color-surface-container-lowest);margin-bottom:24px}.i64-upload-zone:hover,.i64-upload-zone.i64-upload-active{border-color:var(--color-primary);background:var(--color-primary-fixed-dim)}.i64-upload-icon{font-size:48px;color:var(--color-primary)}.i64-upload-zone p{margin:12px 0 0;font-size:var(--text-body-md)}.i64-result{background:var(--color-surface-container-lowest);border:1px solid var(--color-border-subtle);border-radius:var(--radius-xl);padding:24px}.i64-preview{text-align:center;margin-bottom:16px}.i64-preview img{max-width:100%;max-height:200px;border-radius:var(--radius-lg)}.i64-info{text-align:center;color:var(--color-on-surface-variant);font-size:14px;margin-bottom:16px}.i64-label{display:block;font-size:14px;font-weight:600;color:var(--color-on-surface);margin-bottom:8px}.i64-copy-wrap{display:flex;gap:8px}.i64-output{flex:1;padding:12px;border:1px solid var(--color-outline-variant);border-radius:var(--radius-lg);font-family:var(--font-code);font-size:12px;background:#0f172a;color:#e2e8f0;resize:none;min-height:80px;word-break:break-all}.i64-copy-btn{padding:10px 20px;border:none;border-radius:var(--radius-lg);background:var(--color-primary);color:var(--color-on-primary);cursor:pointer;font-weight:600;white-space:nowrap}.i64-clear-btn{margin-top:12px;padding:8px 20px;border:1px solid var(--color-outline-variant);border-radius:var(--radius-lg);background:none;color:var(--color-on-surface-variant);cursor:pointer;font-size:14px}.feat-section,.faq-section-v3,.related-section{padding:64px 0}.feat-section .feat-heading,.faq-section-v3 h2,.related-heading{font-family:var(--font-headline);font-size:var(--text-headline-lg);font-weight:600;text-align:center;margin:0 0 48px;color:var(--color-on-surface)}.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-gutter)}@media (max-width: 1024px){.feat-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 480px){.feat-grid{grid-template-columns:1fr}}.feat-card{padding:32px;background:var(--color-surface-container-lowest);border:1px solid var(--color-border-subtle);border-radius:var(--radius-xl)}.feat-card:hover{box-shadow:var(--shadow-md);border-color:var(--color-primary)}.feat-card .feat-icon{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:24px}.feat-card .feat-icon.feat-primary{background:var(--color-primary-fixed);color:var(--color-primary)}.feat-card .feat-icon.feat-tertiary{background:var(--color-tertiary-fixed);color:var(--color-tertiary)}.feat-card .feat-icon.feat-secondary{background:var(--color-secondary-fixed);color:var(--color-on-secondary-fixed)}.feat-card .feat-icon.feat-error{background:var(--color-error-container);color:var(--color-on-error-container)}.feat-card h3{font-family:var(--font-headline);font-size:var(--text-title-md);font-weight:600;margin:0 0 12px;color:var(--color-on-surface)}.feat-card p{font-size:var(--text-body-md);color:var(--color-on-surface-variant);margin:0}.faq-section-v3 .faq-cat-title{font-family:var(--font-headline);font-size:var(--text-title-md);font-weight:600;color:var(--color-on-surface);margin:32px 0 16px}.faq-section-v3 details{border:1px solid var(--color-border-subtle);border-radius:var(--radius-xl);overflow:hidden;background:var(--color-surface-container-low);margin-bottom:8px}.faq-section-v3 details summary{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;cursor:pointer;font-family:var(--font-headline);font-size:var(--text-title-md);font-weight:600;color:var(--color-on-surface);list-style:none}.faq-section-v3 details summary .mat-icon{transition:transform var(--transition-normal);color:var(--color-outline)}.faq-section-v3 details[open] summary .mat-icon{transform:rotate(180deg)}.faq-section-v3 details .det-content{padding:0 24px 24px;color:var(--color-on-surface-variant);font-size:var(--text-body-md);line-height:var(--text-body-md-line);border-top:1px solid var(--color-border-subtle);margin:0 24px}.i64-decode-section{margin-top:32px;padding:24px;background:var(--color-surface-container-lowest);border:1px solid var(--color-border-subtle);border-radius:var(--radius-xl)}.i64-decode-heading{font-family:var(--font-headline);font-size:var(--text-title-lg);font-weight:600;color:var(--color-on-surface);margin:0 0 8px}.i64-decode-desc{font-size:var(--text-body-sm);color:var(--color-on-surface-variant);margin:0 0 16px}.i64-decode-input{width:100%;padding:14px;border:1px solid var(--color-outline-variant);border-radius:var(--radius-lg);font-family:var(--font-code);font-size:13px;background:#0f172a;color:#e2e8f0;resize:vertical;min-height:80px;box-sizing:border-box;outline:none}.i64-decode-input:focus{border-color:var(--color-primary)}.i64-render-btn{padding:10px 24px;border:none;border-radius:var(--radius-lg);background:var(--color-primary);color:var(--color-on-primary);cursor:pointer;font-weight:600;font-size:14px;margin-top:12px}.i64-decode-result{margin-top:16px}.i64-decode-preview{text-align:center;margin-bottom:12px}.i64-decode-preview img{max-width:100%;max-height:300px;border-radius:var(--radius-lg);border:1px solid var(--color-border-subtle)}.i64-decode-actions{text-align:center}.i64-decode-download-btn{padding:8px 20px;border:1px solid var(--color-outline-variant);border-radius:var(--radius-lg);background:var(--color-surface-container-low);color:var(--color-on-surface);cursor:pointer;font-size:14px}.i64-decode-error{margin-top:12px;padding:12px 16px;background:var(--color-error-container);color:var(--color-on-error-container);border-radius:var(--radius-lg);font-size:14px}.related-section .container{max-width:1200px;margin:0 auto;padding:0 20px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-gutter)}@media (max-width: 768px){.related-grid{grid-template-columns:1fr}}.related-card{padding:24px;background:var(--color-surface-container-lowest);border:1px solid var(--color-border-subtle);border-radius:var(--radius-xl);text-decoration:none;transition:all var(--transition-normal)}.related-card:hover{box-shadow:var(--shadow-md);border-color:var(--color-primary);transform:translateY(-2px)}.related-icon{width:40px;height:40px;border-radius:50%;background:var(--color-primary-fixed);color:var(--color-primary);display:flex;align-items:center;justify-content:center;margin-bottom:16px}.related-card h3{font-size:var(--text-title-sm);font-weight:600;color:var(--color-on-surface);margin:0 0 8px}.related-card p{font-size:var(--text-body-sm);color:var(--color-on-surface-variant);margin:0}