* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    background-color: #f0f2f5;
    color: #1a1a2e;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    background: #1a1a2e;
    padding: 0 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: #a0a0b8;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex: 1;
    width: 100%;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.75rem;
    color: #1a1a2e;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background: #4361ee;
    color: #fff;
}

.btn-primary:hover {
    background: #3a56d4;
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-danger {
    background: #ef4444;
    color: #fff;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    background: #e2e8f0;
    color: #475569;
}

.btn-sm:hover {
    background: #cbd5e1;
}

.table-wrapper {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    overflow-x: auto;
}

.cert-table {
    width: 100%;
    border-collapse: collapse;
}

.cert-table th,
.cert-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #f1f5f9;
}

.cert-table th {
    background: #f8fafc;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    font-weight: 600;
}

.cert-table td {
    font-size: 0.9rem;
}

.cert-table tbody tr:hover {
    background: #f8fafc;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-valid {
    background: #dcfce7;
    color: #166534;
}

.status-expired {
    background: #fef3c7;
    color: #92400e;
}

.status-revoked {
    background: #fecaca;
    color: #991b1b;
}

.verify-page {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.verify-page h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #64748b;
    margin-bottom: 2rem;
}

.search-form {
    margin-bottom: 2rem;
}

.search-group {
    display: flex;
    gap: 0.5rem;
    max-width: 500px;
    margin: 0 auto;
}

.search-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-group input:focus {
    border-color: #4361ee;
}

.result-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    padding: 2rem;
    text-align: left;
}

.result-found {
    border-top: 4px solid #22c55e;
}

.result-not-found {
    border-top: 4px solid #ef4444;
    text-align: center;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.result-not-found .result-header {
    justify-content: center;
}

.result-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: bold;
}

.result-found .result-icon {
    background: #dcfce7;
    color: #166534;
}

.result-not-found .result-icon {
    background: #fecaca;
    color: #991b1b;
}

.result-header h2 {
    font-size: 1.25rem;
}

.result-details {
    display: grid;
    gap: 1rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f1f5f9;
}

.detail-label {
    font-size: 0.85rem;
    color: #64748b;
    font-weight: 500;
}

.detail-value {
    font-weight: 600;
    font-size: 0.95rem;
}

.result-message {
    color: #64748b;
    margin-top: 0.5rem;
    line-height: 1.6;
}

.qr-section {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #f1f5f9;
}

.qr-image {
    width: 180px;
    height: 180px;
    border-radius: 8px;
}

.form-page {
    max-width: 600px;
    margin: 0 auto;
}

.form-page h1 {
    margin-bottom: 1.5rem;
}

.cert-form {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
    margin-bottom: 0.4rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: #4361ee;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.empty-state h2 {
    color: #475569;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
}

.alert-error {
    background: #fecaca;
    color: #991b1b;
}

.footer {
    text-align: center;
    padding: 1.5rem;
    color: #94a3b8;
    font-size: 0.85rem;
    margin-top: auto;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 1rem 0;
        gap: 0.75rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .page-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .search-group {
        flex-direction: column;
    }

    .detail-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
}