:root {
    --blue: #2563eb;
    --blue-dark: #1d4ed8;
    --blue-light: #3b82f6;
    --cyan: #06b6d4;
    --gold: #f59e0b;
    --gold-light: #fbbf24;
    --dark-bg: #0a0a1a;
    --dark-card: #111827;
    --gray-50: #f8f9fa;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-600: #6b7280;
    --gray-700: #4b5563;
    --gray-800: #374151;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,.14);
    --transition: .25s ease;
}

.hero-modern {
    background: var(--dark-bg);
    color: #fff;
    padding: 80px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero-modern::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 30%, rgba(37,99,235,.15), transparent);
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}
.hero-content h1 {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 18px;
    letter-spacing: .5px;
}
.hero-subtitle {
    font-size: 18px;
    color: rgba(255,255,255,.72);
    margin-bottom: 36px;
    line-height: 1.7;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}
.hero-cta {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}
.btn-primary {
    display: inline-block;
    background: var(--blue);
    color: #fff;
    padding: 13px 32px;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 14px rgba(37,99,235,.4);
}
.btn-primary:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,.5);
}
.btn-outline {
    display: inline-block;
    border: 2px solid rgba(255,255,255,.45);
    color: #fff;
    padding: 11px 30px;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.btn-outline:hover {
    border-color: #fff;
    color: #fff;
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 54px;
    position: relative;
    z-index: 1;
}
.stat-item {
    text-align: center;
}
.stat-number {
    display: block;
    font-size: 48px;
    font-weight: 800;
    color: var(--blue-light);
    line-height: 1;
}
.stat-label {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,.6);
    margin-top: 6px;
}

.product-matrix {
    padding: 70px 0;
    background: #fff;
}
.product-matrix h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.section-desc {
    text-align: center;
    color: var(--gray-600);
    font-size: 16px;
    margin-bottom: 40px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}
.matrix-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 860px;
    margin: 0 auto 32px;
}
.matrix-row {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 16px 24px;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}
.matrix-row:hover {
    border-color: var(--blue-light);
    box-shadow: var(--shadow-md);
}
.matrix-row.highlight {
    border-color: var(--gold);
    background: #fffbeb;
}
.matrix-row.highlight:hover {
    box-shadow: 0 4px 20px rgba(245,158,11,.25);
}
.gen-label {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-bg);
    min-width: 72px;
}
.gen-specs {
    flex: 1;
    font-size: 15px;
    color: var(--gray-700);
}
.gen-label-new {
    background: var(--gold);
    color: #000;
    font-size: 12px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 10px;
    white-space: nowrap;
}
.gen-link a {
    color: var(--blue);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    font-size: 14px;
}
.gen-link a:hover {
    text-decoration: underline;
}
.brand-quick-links {
    text-align: center;
    font-size: 15px;
    color: var(--gray-700);
}
.brand-quick-links a {
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
    margin: 0 8px;
    transition: color var(--transition);
}
.brand-quick-links a:hover {
    color: var(--blue-dark);
    text-decoration: underline;
}

.tech-highlights {
    padding: 70px 0;
    background: var(--gray-100);
}
.tech-highlights h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 40px;
}
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.highlight-card {
    background: #fff;
    padding: 28px 24px;
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.highlight-card:hover {
    border-color: var(--blue-light);
    box-shadow: var(--shadow-lg);
}
.hl-icon {
    font-size: 32px;
    margin-bottom: 14px;
}
.highlight-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 10px;
}
.highlight-card p {
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.65;
}
.highlight-card p a {
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
}
.highlight-card p a:hover {
    text-decoration: underline;
}

.industry-solutions {
    padding: 70px 0;
    background: #fff;
}
.industry-solutions h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.industry-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}
.industry-card {
    display: block;
    background: var(--gray-50);
    padding: 32px 24px;
    border-radius: var(--radius);
    text-align: center;
    text-decoration: none;
    color: inherit;
    border: 2px solid transparent;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.industry-card:hover {
    background: linear-gradient(135deg, #eff6ff, #e0f2fe);
    border-color: var(--blue-light);
    box-shadow: var(--shadow-md);
}
.industry-icon {
    font-size: 36px;
    display: block;
    margin-bottom: 12px;
}
.industry-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.industry-card p {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

.partners-modern {
    padding: 60px 0;
    background: var(--gray-100);
}
.partners-modern h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 36px;
}
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}
.partner-card {
    background: #fff;
    padding: 22px 20px;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: box-shadow var(--transition), transform var(--transition);
}
.partner-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.partner-card.secondary {
    background: var(--gray-50);
}
.partner-name {
    display: block;
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-bg);
}
.partner-desc {
    display: block;
    font-size: 12px;
    color: var(--gray-600);
    margin-top: 4px;
}

.knowledge-featured {
    padding: 70px 0;
    background: #fff;
}
.knowledge-featured h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 36px;
}
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.knowledge-card {
    display: block;
    background: var(--gray-50);
    padding: 26px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    border: 2px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.knowledge-card:hover {
    border-color: var(--blue-light);
    box-shadow: var(--shadow-md);
}
.knowledge-card.feature-card {
    grid-column: span 2;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
}
.knowledge-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.knowledge-card p {
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.55;
}
.read-more {
    display: inline-block;
    margin-top: 12px;
    color: var(--blue);
    font-weight: 600;
    font-size: 14px;
}
.more-knowledge {
    text-align: center;
    margin-top: 36px;
}
.more-knowledge .btn-outline,
.more-cases .btn-outline {
    display: inline-block;
    border: 2px solid var(--blue);
    color: var(--blue);
    padding: 11px 30px;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}
.more-knowledge .btn-outline:hover,
.more-cases .btn-outline:hover {
    background: var(--blue);
    color: #fff;
    transform: translateY(-2px);
}

.case-highlights {
    padding: 70px 0;
    background: var(--gray-100);
}
.case-highlights h2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 36px;
}
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.case-card {
    display: block;
    background: #fff;
    padding: 26px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    border: 2px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.case-card:hover {
    border-color: var(--blue-light);
    box-shadow: var(--shadow-md);
}
.case-tag {
    display: inline-block;
    background: var(--blue);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 10px;
}
.case-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.case-card p {
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.55;
}
.more-cases {
    text-align: center;
    margin-top: 36px;
}

/* ============================================================
   GEO 生成式优化系统 动态推送区
   ============================================================ */
.geo-feed-section {
    padding: 60px 0;
    background: var(--gray-100);
}
.geo-feed-section h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 8px;
}
.geo-feed-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 36px;
}
.geo-feed-item {
    background: #fff;
    padding: 24px 20px;
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.geo-feed-item:hover {
    border-color: var(--blue-light);
    box-shadow: var(--shadow-md);
}
.geo-feed-time {
    display: block;
    font-size: 12px;
    color: var(--gray-600);
    margin-bottom: 8px;
}
.geo-feed-title {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-bg);
    text-decoration: none;
    margin-bottom: 8px;
    transition: color var(--transition);
}
.geo-feed-title:hover {
    color: var(--blue);
}
.geo-feed-excerpt {
    font-size: 13px;
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: 10px;
}
.geo-feed-source {
    display: inline-block;
    font-size: 11px;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: 3px 10px;
    border-radius: 20px;
}

.nav-links .nav-active {
    color: #4cc9f0;
}
.nav-links .nav-active::after {
    width: 100%;
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 28px;
    }
    .hero-subtitle {
        font-size: 15px;
    }
    .hero-stats {
        gap: 20px;
    }
    .stat-number {
        font-size: 36px;
    }
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    .industry-grid {
        grid-template-columns: 1fr;
    }
    .knowledge-grid {
        grid-template-columns: 1fr;
    }
    .knowledge-card.feature-card {
        grid-column: span 1;
    }
    .case-grid {
        grid-template-columns: 1fr;
    }
    .partner-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .matrix-row {
        flex-wrap: wrap;
        gap: 10px;
    }
    .geo-feed-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .hero-content h1 { font-size: 36px; }
    .hero-stats { gap: 30px; }
    .stat-number { font-size: 40px; }
}

@media (max-width: 480px) {
    .hero-content h1 { font-size: 24px; }
    .hero-subtitle { font-size: 14px; }
    .hero-stats { gap: 16px; margin-top: 28px; }
    .stat-number { font-size: 28px; }
    .stat-label { font-size: 12px; }
    .btn-primary, .btn-outline { padding: 10px 22px; font-size: 14px; }
    .product-matrix h2 { font-size: 22px; }
    .section-desc { font-size: 14px; }
    .matrix-row { flex-direction: column; gap: 10px; padding: 14px 16px; text-align: center; }
}