:root {
    --color-primary: #2f3f63;
    --color-primary-dark: #252e3a;
    --color-accent: #ffb26b;
    --color-surface: #eef2fb;
    --color-text: #1f2733;
    --rgb-primary: 47,63,99;
    --rgb-accent: 255,178,107;
    --radius-sm: 6px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 2px rgba(31,39,51,.10), 0 3px 8px -2px rgba(47,63,99,.12);
    --shadow-md: 0 6px 14px -4px rgba(37,46,58,.20), 0 16px 34px -10px rgba(47,63,99,.26);
    --shadow-lg: 0 18px 34px -14px rgba(37,46,58,.34), 0 36px 76px -20px rgba(47,63,99,.32);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.45s cubic-bezier(.22,.61,.36,1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background-color: #f7f9ff;
    background-image: linear-gradient(178deg, #f7f9ff 0%, #eef2fb 42%, #e5ecfa 78%, #dde5f7 100%);
    accent-color: var(--color-primary);
    caret-color: var(--color-primary);
}
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: var(--radius-lg);
    box-shadow: var(--shadow-md), inset 0 0 0 1px rgba(47,63,99,.07);
    padding: var(--space-card);
    transition: var(--transition);
    background-color: #ffffff;
    background-image: linear-gradient(158deg, #ffffff 0%, #f6f8ff 46%, #e9eefc 78%, #dfe7f8 100%);
    color: var(--color-text);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background-color: var(--color-primary);
    background-image: linear-gradient(132deg, #252e3a 0%, #2f3f63 38%, #4a5f96 74%, #6d84c4 100%);
    color: #ffffff;
    box-shadow: 0 8px 18px -6px rgba(47,63,99,.55), inset 0 1px 0 rgba(255,255,255,.20);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* 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: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

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

/* cta: full-bg */
.cta-section {
    background-color: var(--color-primary-dark);
    background-image: linear-gradient(128deg, #1e2733 0%, #252e3a 26%, #2f3f63 58%, #4d64a0 84%, #ffb26b 165%);
    color: #fff;
    padding: 4rem 2rem;
    box-shadow: var(--shadow-lg), inset 0 0 0 1px rgba(255,226,196,.10);
    text-shadow: 0 1px 3px rgba(15,20,28,.45);
}

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar {
    background-color: transparent;
    background-image: linear-gradient(180deg, rgba(37,46,58,.07) 0%, rgba(37,46,58,.02) 55%, rgba(37,46,58,0) 100%);
}

/* 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; }
}