*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f172a;--surface:#1e293b;--surface2:#273549;--border:#334155;--text:#f1f5f9;--text-muted:#94a3b8;--accent:#3b82f6;--accent-h:#2563eb;--success:#22c55e;--success-bg:#052e16;--warning:#f59e0b;--warning-bg:#451a03;--error:#ef4444;--error-bg:#450a0a;--radius:12px;--transition:.15s ease;font-size:16px}body{background:var(--bg);color:var(--text);min-height:100dvh;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.app{flex-direction:column;align-items:center;min-height:100dvh;padding:2rem 1rem 4rem;display:flex}.app-header{text-align:center;margin-bottom:2.5rem}.app-title{letter-spacing:-.02em;font-size:clamp(1.75rem,5vw,2.5rem);font-weight:700}.app-subtitle{color:var(--text-muted);margin-top:.5rem;font-size:1rem}.app-content{width:100%;max-width:600px}.app-footer{color:var(--text-muted);margin-top:auto;padding-top:3rem;font-size:.8rem}.tabs{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);gap:.25rem;width:100%;max-width:600px;margin-bottom:1.5rem;padding:.25rem;display:flex}.tab-btn{border-radius:calc(var(--radius) - 4px);color:var(--text-muted);cursor:pointer;transition:background var(--transition), color var(--transition);background:0 0;border:none;flex:1;padding:.6rem 1rem;font-size:.95rem;font-weight:500}.tab-btn:hover{background:var(--surface2);color:var(--text)}.tab-btn--active{background:var(--accent);color:#fff}.tab-panel{flex-direction:column;gap:1.25rem;display:flex}.dropzone{border:2px dashed var(--border);border-radius:var(--radius);background:var(--surface);cursor:pointer;transition:border-color var(--transition), background var(--transition);-webkit-user-select:none;user-select:none;flex-direction:column;justify-content:center;align-items:center;gap:.5rem;min-height:140px;padding:2.5rem 1.5rem;display:flex}.dropzone:hover:not(.dropzone--disabled),.dropzone:focus-visible:not(.dropzone--disabled){border-color:var(--accent);background:var(--surface2);outline:none}.dropzone--over{border-color:var(--accent);background:var(--surface2)}.dropzone--filled{border-style:solid;border-color:var(--success)}.dropzone--disabled{opacity:.6;cursor:default}.dropzone__icon{color:var(--text-muted);font-size:1.75rem;line-height:1}.dropzone__text{color:var(--text-muted);text-align:center;font-size:.9rem}.dropzone__filename{color:var(--success);word-break:break-all;text-align:center;font-size:.9rem;font-weight:500}.verify-dropzones{grid-template-columns:1fr 1fr;gap:1rem;display:grid}@media (width<=480px){.verify-dropzones{grid-template-columns:1fr}}.verify-dropzone-slot{flex-direction:column;gap:.4rem;display:flex}.slot-label{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);font-size:.8rem;font-weight:600}.progress-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;align-items:center;gap:1rem;padding:2rem;display:flex}.progress-label{color:var(--text-muted);font-size:.95rem}.spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:36px;height:36px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.result-card{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);text-align:center;flex-direction:column;align-items:center;gap:1rem;padding:2rem;display:flex}.result-card--success{border-color:var(--success);background:var(--success-bg)}.result-card--error{border-color:var(--error);background:var(--error-bg)}.result-card--pending{border-color:var(--warning);background:var(--warning-bg)}.result-icon{font-size:2.5rem;line-height:1}.result-card--success .result-icon{color:var(--success)}.result-card--error .result-icon{color:var(--error)}.result-card--pending .result-icon{color:var(--warning)}.result-card h2{font-size:1.4rem;font-weight:700}.result-summary{color:var(--text-muted);font-size:.95rem}.hash-display{background:var(--surface2);border:1px solid var(--border);text-align:left;border-radius:8px;flex-direction:column;gap:.35rem;width:100%;padding:.75rem 1rem;display:flex;position:relative}.hash-display--compact{padding:.5rem .75rem}.hash-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-size:.7rem;font-weight:700}.hash-value{color:var(--text);word-break:break-all;font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace;font-size:.72rem;line-height:1.5}.copy-btn{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;transition:color var(--transition), border-color var(--transition);border-radius:4px;padding:.2rem .5rem;font-size:.7rem;position:absolute;top:.5rem;right:.5rem}.copy-btn:hover{color:var(--text);border-color:var(--accent)}.btn{cursor:pointer;transition:background var(--transition), color var(--transition), border-color var(--transition);border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;padding:.65rem 1.5rem;font-size:.95rem;font-weight:600;display:inline-flex}.btn--primary{background:var(--accent);color:#fff}.btn--primary:hover{background:var(--accent-h)}.btn--ghost{border-color:var(--border);color:var(--text-muted);background:0 0}.btn--ghost:hover{border-color:var(--text-muted);color:var(--text)}.alert{border-radius:8px;align-items:flex-start;gap:.5rem;padding:.85rem 1rem;font-size:.9rem;display:flex;position:relative}.alert--error{background:var(--error-bg);border:1px solid var(--error);color:#fca5a5}.alert__dismiss{color:inherit;cursor:pointer;opacity:.7;background:0 0;border:none;margin-left:auto;padding:0 .25rem;font-size:1.1rem;line-height:1}.alert__dismiss:hover{opacity:1}.privacy-notice{color:var(--text-muted);text-align:center;font-size:.8rem;line-height:1.5}.hint{color:var(--text-muted);text-align:center;max-width:380px;font-size:.82rem}.app-content--wide{max-width:800px}.about{gap:2.5rem}.about-hero{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);border-left:4px solid var(--accent);padding:2rem}.about-lead{color:var(--text);font-size:1.15rem;line-height:1.7}.about-section{flex-direction:column;gap:1rem;display:flex}.about-section h2{color:var(--text);border-bottom:1px solid var(--border);padding-bottom:.5rem;font-size:1.2rem;font-weight:700}.about-section p{color:var(--text-muted);font-size:.95rem;line-height:1.75}.use-case-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem;display:grid}.use-case-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:.5rem;padding:1.25rem;display:flex}.use-case-icon{font-size:1.6rem;line-height:1}.use-case-card h3{color:var(--text);font-size:.95rem;font-weight:700}.use-case-card p{color:var(--text-muted);font-size:.85rem;line-height:1.6}.steps-list{flex-direction:column;gap:1rem;list-style:none;display:flex}.steps-list li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);align-items:flex-start;gap:1rem;padding:1rem 1.25rem;display:flex}.step-number{background:var(--accent);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:.85rem;font-weight:700;display:flex}.steps-list li div{color:var(--text-muted);font-size:.9rem;line-height:1.65}.steps-list li div strong{color:var(--text);margin-bottom:.2rem;display:block}.faq-list{flex-direction:column;gap:1rem;display:flex}.faq-list dt{color:var(--text);border-top:1px solid var(--border);padding:.75rem 1rem .25rem;font-size:.95rem;font-weight:700}.faq-list dd{color:var(--text-muted);padding:0 1rem .75rem;font-size:.88rem;line-height:1.7}