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var(--border-default);border-radius:12px;overflow:hidden}.how-step{display:flex;align-items:flex-start;gap:18px;padding:18px 22px;border-bottom:1px solid var(--border-subtle);background-color:var(--bg-surface)}.how-step:last-child{border-bottom:none}.how-number{width:28px;height:28px;border-radius:50%;background-color:var(--accent);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}.how-text strong{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:3px}.how-text p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.55}.info-cards-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.info-cards-grid--3{grid-template-columns:repeat(3,1fr)}.info-card{background-color:var(--bg-surface);border:1px solid var(--border-default);border-radius:12px;padding:20px 22px}.info-card-icon{font-size:22px;margin-bottom:10px}.info-card h3{font-size:14px;font-weight:600;color:var(--text-secondary);margin:0 0 8px}.info-card p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.6}.info-section{max-width:760px}.about-origin{margin-bottom:36px;padding:22px 26px;background:var(--bg-surface);border:1px solid var(--border-default);border-radius:12px}.about-origin p{font-size:14px;color:var(--text-muted);line-height:1.7;margin:0 0 12px}.about-origin p:last-child{margin-bottom:0}.about-features-header{margin-bottom:16px}.about-features-header h3{font-size:17px;font-weight:600;color:var(--text-heading);margin:0 0 4px}.about-features-header p{font-size:13px;color:var(--text-muted);margin:0}.about-features-grid{display:flex;flex-direction:column;gap:0;border:1px solid var(--border-default);border-radius:12px;overflow:hidden;margin-bottom:32px}.about-feature-card{padding:18px 22px;border-bottom:1px solid var(--border-subtle);background:var(--bg-surface)}.about-feature-card:last-child{border-bottom:none}.about-feature-title{font-size:14px;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.about-feature-card p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.6}.about-privacy-block{padding:22px 26px;background:var(--accent-dim);border:1px solid rgba(31,157,85,.15);border-radius:12px}.about-privacy-block h3{font-size:14px;font-weight:600;color:var(--accent-bright);margin:0 0 8px}.about-privacy-block p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.65}.home-logged-out{max-width:680px;margin:0 auto}.home-how{margin-bottom:32px}.home-how h3{font-size:17px;font-weight:600;color:var(--text-heading);margin:0 0 14px}.home-features{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:16px}.home-feature-card{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:12px;padding:18px 20px}.home-feature-title{font-size:13px;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.home-feature-card p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.6}.contact-section{max-width:560px}.contact-cards{display:flex;flex-direction:column;gap:12px}.contact-link-card{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;background:var(--bg-surface);border:1px solid var(--border-default);border-radius:12px;text-decoration:none;transition:border-color .18s,background .18s}.contact-link-card:hover{border-color:var(--accent);background:var(--bg-elevated)}.contact-link-card-inner{display:flex;flex-direction:column;gap:3px}.contact-link-label{font-size:14px;font-weight:600;color:var(--text-secondary)}.contact-link-url{font-size:13px;color:var(--accent-bright)}.contact-link-desc{font-size:12px;color:var(--text-muted);margin-top:2px}.contact-link-arrow{font-size:18px;color:var(--text-faint);transition:color .18s,transform .18s}.contact-link-card:hover .contact-link-arrow{color:var(--accent);transform:translate(3px)}.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.25);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;display:inline-block;flex-shrink:0}@keyframes spin{to{transform:rotate(360deg)}}.app-footer{background-color:var(--bg-footer);border-top:1px solid var(--border-subtle);padding:18px 24px;text-align:center}.app-footer p{margin:0;font-size:13px;color:var(--text-faint)}@media(max-width:700px){.header-nav,.header-auth{display:none}.mobile-menu-btn{display:block}.hero h2{font-size:24px}.hero-actions{flex-direction:column;align-items:center}.info-cards-grid,.info-cards-grid--3,.contact-grid{grid-template-columns:1fr;gap:10px}.upload-form{padding:20px 18px}.auth-card{padding:28px 22px}.main-content{padding:24px 16px 80px}.theme-toggle-btn{bottom:16px;right:16px}}