:root {
    --seo-bg: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%);
    --seo-surface: rgba(255, 255, 255, 0.95);
    --seo-surface-strong: #ffffff;
    --seo-border: rgba(148, 163, 184, 0.28);
    --seo-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
    --seo-accent: #2563eb;
    --seo-accent-dark: #1d4ed8;
    --seo-accent-soft: rgba(37, 99, 235, 0.12);
    --seo-text: #0f172a;
    --seo-text-muted: #475569;
    --seo-text-soft: #64748b;
    --seo-success: #059669;
    --seo-warning: #d97706;
    --seo-danger: #dc2626;
    --seo-radius: 24px;
    --seo-radius-sm: 16px;
    --seo-max-width: 1180px;
}

body.seo-page {
    background: var(--seo-bg);
    color: var(--seo-text);
}

.seo-page .navbar {
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(148, 163, 184, 0.24);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 20;
}

.seo-page .nav-brand a,
.seo-page .nav-link {
    text-decoration: none;
}

.seo-page .nav-brand a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: inherit;
}

.seo-shell {
    width: min(var(--seo-max-width), calc(100% - 32px));
    margin: 0 auto;
}

.seo-hero {
    padding: 72px 0 48px;
}

.seo-hero-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.96), rgba(79, 70, 229, 0.92));
    border-radius: 32px;
    padding: clamp(28px, 5vw, 56px);
    color: #fff;
    box-shadow: 0 24px 64px rgba(37, 99, 235, 0.22);
}

.seo-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 14px;
    border-radius: 999px;
    margin-bottom: 18px;
}

.seo-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.9fr);
    gap: 28px;
    align-items: start;
}

.seo-hero h1 {
    font-size: clamp(2.25rem, 5vw, 4rem);
    line-height: 1.08;
    margin-bottom: 16px;
}

.seo-hero p {
    font-size: 1.08rem;
    line-height: 1.75;
    color: rgba(255, 255, 255, 0.92);
    max-width: 760px;
}

.hero-points,
.hero-links,
.tool-grid,
.related-tools,
.faq-grid,
.info-grid,
.calc-result-grid,
.category-grid,
.summary-grid {
    list-style: none;
    padding: 0;
    margin: 0;
}

.hero-points {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.hero-points li {
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 18px;
    padding: 14px 16px;
    font-weight: 500;
}

.hero-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hero-links a,
.related-tools a,
.section-link,
.tool-link-list a {
    color: inherit;
    text-decoration: none;
}

.hero-link-card,
.tool-card,
.info-card,
.faq-item,
.result-card,
.summary-card,
.category-card {
    background: var(--seo-surface);
    border: 1px solid var(--seo-border);
    border-radius: var(--seo-radius);
    box-shadow: var(--seo-shadow);
}

.hero-link-card {
    color: var(--seo-text);
    padding: 20px;
}

.hero-link-card strong {
    display: block;
    font-size: 1rem;
    margin-bottom: 6px;
}

.hero-link-card span {
    display: block;
    color: var(--seo-text-muted);
    line-height: 1.6;
}

.seo-section {
    padding: 16px 0 32px;
}

.seo-section h2 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    margin-bottom: 14px;
}

.section-intro {
    color: var(--seo-text-muted);
    max-width: 760px;
    line-height: 1.75;
    margin-bottom: 24px;
}

.category-grid,
.summary-grid,
.info-grid,
.faq-grid,
.tool-grid,
.calc-result-grid,
.related-tools {
    display: grid;
    gap: 18px;
}

.category-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.category-card,
.summary-card,
.info-card,
.result-card,
.faq-item,
.tool-card {
    padding: 24px;
}

.category-card h3,
.summary-card h3,
.info-card h3,
.result-card h3,
.faq-item h3,
.tool-card h3 {
    margin-bottom: 10px;
    font-size: 1.16rem;
}

.category-card p,
.summary-card p,
.info-card p,
.result-card p,
.faq-item p,
.tool-card p,
.tool-card li,
.info-card li {
    color: var(--seo-text-muted);
    line-height: 1.72;
}

.category-card ul,
.info-card ul,
.tool-card ul {
    margin-top: 14px;
    padding-left: 18px;
}

.summary-grid {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.summary-card {
    background: rgba(255, 255, 255, 0.78);
}

.summary-label {
    font-size: 0.92rem;
    color: var(--seo-text-soft);
    margin-bottom: 8px;
}

.summary-value {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--seo-accent);
}

.summary-note {
    margin-top: 8px;
    color: var(--seo-text-muted);
}

.tool-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
}

.tool-panel {
    background: var(--seo-surface-strong);
    border: 1px solid var(--seo-border);
    border-radius: 28px;
    box-shadow: var(--seo-shadow);
    padding: clamp(24px, 4vw, 36px);
}

.tool-panel h2,
.tool-panel h3 {
    margin-bottom: 10px;
}

.tool-panel p {
    color: var(--seo-text-muted);
    line-height: 1.75;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-top: 22px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-field label {
    font-weight: 600;
    color: var(--seo-text);
}

.form-field input,
.form-field select {
    width: 100%;
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    background: #fff;
    padding: 14px 16px;
    font: inherit;
    color: var(--seo-text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-field input:focus,
.form-field select:focus {
    outline: none;
    border-color: var(--seo-accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.seo-button,
.seo-button-secondary {
    border: none;
    border-radius: 999px;
    padding: 14px 22px;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.seo-button {
    background: var(--seo-accent);
    color: #fff;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.24);
}

.seo-button:hover,
.seo-button:focus-visible,
.seo-button-secondary:hover,
.seo-button-secondary:focus-visible {
    transform: translateY(-1px);
}

.seo-button-secondary {
    background: var(--seo-accent-soft);
    color: var(--seo-accent-dark);
}

.status-text {
    margin-top: 18px;
    color: var(--seo-text-soft);
    min-height: 24px;
}

.status-text.success {
    color: var(--seo-success);
}

.status-text.warning {
    color: var(--seo-warning);
}

.status-text.error {
    color: var(--seo-danger);
}

.calc-result-grid {
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    margin-top: 22px;
}

.result-card span {
    display: block;
}

.result-label {
    color: var(--seo-text-soft);
    font-size: 0.92rem;
    margin-bottom: 8px;
}

.result-value {
    color: var(--seo-accent-dark);
    font-weight: 700;
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
}

.result-helper {
    margin-top: 8px;
    color: var(--seo-text-muted);
}

.info-grid,
.faq-grid,
.related-tools {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.related-tools a {
    display: block;
    padding: 20px;
    background: var(--seo-surface);
    border: 1px solid var(--seo-border);
    border-radius: 20px;
    box-shadow: var(--seo-shadow);
    color: var(--seo-text);
}

.related-tools strong,
.tool-link-list strong {
    display: block;
    margin-bottom: 8px;
}

.related-tools span,
.tool-link-list span {
    color: var(--seo-text-muted);
    line-height: 1.6;
}

.tool-link-list {
    display: grid;
    gap: 14px;
    margin-top: 14px;
}

.page-footer-space {
    padding-bottom: 24px;
}

@media (max-width: 960px) {
    .seo-hero-grid,
    .tool-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 768px) {
    .seo-shell {
        width: min(var(--seo-max-width), calc(100% - 24px));
    }

    .seo-hero {
        padding-top: 36px;
    }

    .seo-hero-card,
    .tool-panel,
    .category-card,
    .summary-card,
    .info-card,
    .result-card,
    .faq-item,
    .tool-card {
        padding: 20px;
        border-radius: 22px;
    }

    .hero-points,
    .summary-grid,
    .calc-result-grid,
    .info-grid,
    .faq-grid,
    .related-tools,
    .category-grid {
        grid-template-columns: 1fr;
    }

    .action-row {
        flex-direction: column;
    }

    .seo-button,
    .seo-button-secondary {
        width: 100%;
    }
}