.back-link-bar {
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px 20px 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f7fb;
    color: #1f2937;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 20px;
}

header {
    margin-bottom: 24px;
}

header h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}

header p {
    margin: 0;
    color: #4b5563;
}

.seo-content {
    margin-bottom: 20px;
    padding: 16px 18px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.seo-content h2 {
    margin: 0 0 8px;
    font-size: 1.2rem;
}

.seo-content p {
    margin: 0;
    line-height: 1.6;
    color: #4b5563;
}

.tool-box {
    background: #ffffff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 6px;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

button {
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    cursor: pointer;
    font-weight: 600;
    background: #2563eb;
    color: #ffffff;
    transition: background 0.2s ease;
}

button:hover {
    background: #1d4ed8;
}

.status {
    margin-top: 16px;
    padding: 10px 12px;
    border-radius: 8px;
    background: #eff6ff;
    color: #1d4ed8;
}

.status.success {
    background: #ecfdf3;
    color: #047857;
}

.status.error {
    background: #fef2f2;
    color: #b91c1c;
}

/* Tab controls */
.tab-btn {
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: border-color 0.2s, color 0.2s;
}

.tab-btn:hover {
    color: #1d4ed8 !important;
}

@keyframes scanLine {
    0% { transform: translateY(0); }
    50% { transform: translateY(110px); }
    100% { transform: translateY(0); }
}

#scanIndicator div {
    animation: scanLine 2s linear infinite;
}

.site-footer {
    margin-top: 24px;
    padding: 16px 0;
    text-align: center;
    color: #6b7280;
    font-size: 0.95rem;
}

.ad-banner {
    margin-top: 20px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.ad-banner img {
    display: block;
    width: 100%;
    height: auto;
}