:root {
    --color-primary: #4f6fad;
    --color-primary-dark: #344c7e;
    --color-accent: #7bb8a4;
    --color-surface: #f4f7fb;
    --color-text: #273142;
    --rgb-primary: 79,111,173;
    --rgb-accent: 123,184,164;
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --shadow-sm: 0 4px 10px rgba(39,49,66,.06), 0 12px 24px -14px rgba(79,111,173,.18);
    --shadow-md: 0 6px 14px rgba(39,49,66,.07), 0 22px 44px -18px rgba(79,111,173,.16);
    --shadow-lg: 0 10px 24px rgba(39,49,66,.08), 0 28px 56px -20px rgba(79,111,173,.18);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.38s ease;
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f8fbff 0%, #eef3f8 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #20304d; text-shadow: 0 1px 0 rgba(255,255,255,.65); }
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); padding: var(--space-card); transition: var(--transition); background: linear-gradient(180deg, #ffffff 0%, #f6f9fc 100%); border-color: rgba(79,111,173,.14); border-style: solid; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(180deg, #5b7bbb 0%, #44649d 100%); color: #f8fbff; border-color: rgba(52,76,126,.26); border-style: solid; box-shadow: 0 4px 8px rgba(0,0,0,.05), 0 20px 40px -10px rgba(52,76,126,.22); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(79,111,173,.32); }

/* ========== 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: 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; background: linear-gradient(180deg, #ffffff 0%, #f2f6fb 100%); border-radius: var(--radius-lg); box-shadow: 0 4px 8px rgba(0,0,0,.04), 0 20px 40px -10px rgba(79,111,173,.14); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: radial-gradient(circle at top, rgba(123,184,164,.18) 0%, rgba(123,184,164,0) 36%), linear-gradient(135deg, #eef4fb 0%, #dde7f4 100%); }
                .hero-content { position: relative; z-index: 1; filter: drop-shadow(0 14px 28px rgba(39,49,66,.08)); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); background: linear-gradient(180deg, #ffffff 0%, #f5f8fc 100%); border-radius: var(--radius-lg); box-shadow: 0 4px 8px rgba(0,0,0,.05), 0 20px 40px -10px rgba(39,49,66,.1); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* 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; color: #3d5f98; text-shadow: 0 2px 10px rgba(79,111,173,.16); }

/* cta: card-style */
.cta-inner { background: linear-gradient(180deg, #f8fbff 0%, #eaf1f8 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 4px 8px rgba(0,0,0,.05), 0 20px 40px -10px rgba(79,111,173,.16); border-color: rgba(79,111,173,.14); border-style: solid; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
.card { border-left: 3px solid var(--color-primary); }
header, .header, .navbar { box-shadow: 0 4px 8px rgba(0,0,0,.04), 0 20px 40px -10px rgba(39,49,66,.12); background: rgba(250,252,255,.88); backdrop-filter: blur(14px); border-color: rgba(79,111,173,.1); border-style: solid; }

/* 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; }
}