:root{--primary-blue:#0f172a;--accent-orange:#f97316;--valid-green:#10b981;--expired-red:#ef4444;--unknown-grey:#6b7280;--bg-color:#f8fafc;--card-bg:#fff;--text-main:#1e293b;--text-muted:#64748b;--border-color:#e2e8f0}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.app-container{flex-direction:column;min-height:100vh;display:flex}.header{background-color:var(--primary-blue);color:#fff;text-align:center;border-bottom:4px solid var(--accent-orange);padding:1.5rem 2rem}.header h1{letter-spacing:.5px;font-size:1.5rem;font-weight:600}.main-content{flex:1;justify-content:center;align-items:center;padding:2rem;display:flex}.validation-card{background:var(--card-bg);border-radius:12px;width:100%;max-width:600px;overflow:hidden;box-shadow:0 10px 25px -5px #0000001a,0 8px 10px -6px #0000001a}.status-banner{text-align:center;color:#fff;text-transform:uppercase;letter-spacing:1px;padding:1.5rem;font-size:1.25rem;font-weight:700}.status-banner.valid{background-color:var(--valid-green)}.status-banner.expired{background-color:var(--expired-red)}.status-banner.unknown{background-color:var(--unknown-grey)}.details-section{padding:2rem}.details-grid{grid-template-columns:1fr;gap:1.25rem;display:grid}@media (width>=600px){.details-grid{grid-template-columns:1fr 1fr}}.detail-item{flex-direction:column;gap:.25rem;display:flex}.detail-label{text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;font-size:.75rem;font-weight:600}.detail-value{color:var(--text-main);word-break:break-word;font-size:1rem;font-weight:500}.action-section{background-color:var(--bg-color);border-top:1px solid var(--border-color);justify-content:center;padding:1.5rem 2rem;display:flex}.btn-download{background-color:var(--accent-orange);color:#fff;cursor:pointer;border:none;border-radius:6px;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;text-decoration:none;transition:background-color .2s,transform .1s;display:inline-flex}.btn-download:hover{background-color:#ea580c}.btn-download:active{transform:translateY(1px)}.footer{text-align:center;color:var(--text-muted);padding:1.5rem;font-size:.875rem}.loader-container{color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;gap:1rem;padding:4rem 2rem;display:flex}.spinner{border:4px solid var(--border-color);border-top-color:var(--accent-orange);border-radius:50%;width:40px;height:40px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}