:root {
    --color-primary: #4A90D9;
    --color-primary-dark: #2C6B9E;
    --color-accent: #7B68EE;
    --color-surface: #ffffff;
    --color-text: #1e1e2f;
    --rgb-primary: 74,144,217;
    --rgb-accent: 123,104,238;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.06);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
    --gradient-primary: linear-gradient(135deg, #4A90D9 0%, #7B68EE 100%);
    --gradient-card: linear-gradient(135deg, #ffffff 0%, #f7f7ff 100%);
    --gradient-accent: linear-gradient(135deg, #7B68EE 0%, #4A90D9 100%);
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(145deg, #f4f4f9 0%, #e8e8f0 100%);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: var(--gradient-card);
    border-image: var(--gradient-primary) 1;
    border-image-slice: 1;
}
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: var(--gradient-card);
    border: 2px solid transparent;
    border-image: var(--gradient-accent) 1;
    border-image-slice: 1;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--gradient-primary);
    color: #fff;
    border: none;
    box-shadow: 0 2px 10px rgba(74,144,217,0.3);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration: none;
    background-image: var(--gradient-primary);
    background-size: 0% 2px;
    background-repeat: no-repeat;
    background-position: left bottom;
    -webkit-background-clip: text;
    background-clip: text;
}
a:not([class]):hover { background-size: 100% 2px; }

/* ========== Section Layout Variants ========== */

/* news: masonry-2 */
.news-grid {
    column-count: 2;
    column-gap: var(--space-gap);
}
.news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

/* features: centered */
.feature-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--space-gap) * 2);
    max-width: 720px;
    margin: 0 auto;
}

/* hero: centered */
.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* testimonials: carousel */
.testimonial-list {
    display: flex;
    overflow: hidden;
}
.testimonial-list > * { flex: 0 0 100%; }

/* partners: grid-6 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-gap);
    align-items: center;
}

/* faq: two-column */
.faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-gap);
}

/* stats: grid-4 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    text-align: center;
}

/* cta: card-style */
.cta-inner {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    color: #fff;
    box-shadow: var(--shadow-lg);
}

/* Page Layout: narrow-centered */
.page-main {
    max-width: 860px;
    margin: 0 auto;
}

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-decoration: none;
}

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}
@media (max-width: 640px) {
    :root {
        --space-section: 2rem;
        --space-card: 1rem;
        --space-gap: 0.75rem;
    }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
}