:root {
    --color-primary: #2b6cb0;
    --color-primary-dark: #1f4f8f;
    --color-accent: #6ee7b7;
    --color-surface: #f5f7ff;
    --color-text: #152033;
    --rgb-primary: 43,108,176;
    --rgb-accent: 110,231,183;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 5px rgba(12, 18, 28, 0.08), 0 1px 2px rgba(12, 18, 28, 0.06);
    --shadow-md: 0 6px 14px rgba(12, 18, 28, 0.10), 0 2px 6px rgba(12, 18, 28, 0.06), 0 1px 0 rgba(255,255,255,0.65) inset;
    --shadow-lg: 0 10px 22px rgba(12, 18, 28, 0.12), 0 30px 60px -20px rgba(12, 18, 28, 0.20), 0 1px 0 rgba(255,255,255,0.7) inset;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.38s ease;
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    text-shadow: 0 1px 0 rgba(255,255,255,0.55);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: 20px;
    box-shadow:
        0 4px 10px rgba(0,0,0,0.06),
        0 18px 40px -14px rgba(0,0,0,0.14),
        0 1px 0 rgba(255,255,255,0.70) inset,
        0 0 0 1px rgba(25, 46, 75, 0.06) inset;
    padding: var(--space-card);
    transition:
        transform 0.38s ease,
        box-shadow 0.38s ease,
        border-color 0.38s ease,
        background-color 0.38s ease,
        color 0.38s ease;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: 16px;
    transition:
        background-color 0.38s ease,
        box-shadow 0.38s ease,
        transform 0.38s ease,
        color 0.38s ease,
        border-color 0.38s ease;
}
a:not([class]) {
    color: var(--color-primary);
    transition:
        color 0.38s ease,
        text-shadow 0.38s ease,
        filter 0.38s ease;
}

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 8px 22px rgba(110, 231, 183, 0.26);
}
.card { border-left: 4px solid var(--color-primary); }

/* 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; }
}