:root {
    --color-primary: #2469a7;
    --color-primary-dark: #174b78;
    --color-accent: #ff5ea8;
    --color-surface: #f5f9ff;
    --color-text: #0f2233;
    --rgb-primary: 36,105,167;
    --rgb-accent: 255,94,168;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 22px;
    --radius-xl: 34px;
    --shadow-sm: 0 3px 10px rgba(17, 56, 92, 0.08);
    --shadow-md: 0 4px 10px rgba(0,0,0,0.05), 0 18px 34px -12px rgba(0,0,0,0.13);
    --shadow-lg: 0 6px 16px rgba(0,0,0,0.06), 0 26px 60px -18px rgba(0,0,0,0.15);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.35s cubic-bezier(0.2, 0.75, 0.2, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
    --ring: rgba(36,105,167,0.28);
    --card-stroke: rgba(36,105,167,0.22);
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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:
        0 4px 8px rgba(0,0,0,0.045),
        0 20px 40px -10px rgba(0,0,0,0.12),
        inset 0 1px 0 rgba(255,255,255,0.55);
    padding: var(--space-card);
    transition:
        box-shadow 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        transform 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        border-color 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        background-color 0.35s cubic-bezier(0.2, 0.75, 0.2, 1);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        box-shadow 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        background-color 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        color 0.35s cubic-bezier(0.2, 0.75, 0.2, 1),
        transform 0.35s cubic-bezier(0.2, 0.75, 0.2, 1);
}
a:not([class]) { color: var(--color-primary); transition: color 0.35s cubic-bezier(0.2, 0.75, 0.2, 1), opacity 0.35s cubic-bezier(0.2, 0.75, 0.2, 1); }
a:not([class]):focus { outline: 2px solid rgba(255,94,168,0.35); outline-offset: 3px; }
.card { border-left: 3px solid var(--color-primary); }

a:not([class]) { text-shadow: 0 1px 0 rgba(255,255,255,0.55); }
.card { text-shadow: 0 1px 0 rgba(255,255,255,0.45); }

.card, [class*="card"] {
    background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(245,249,255,0.7));
    border: 1px solid rgba(36,105,167,0.14);
}
.card:hover, [class*="card"]:hover {
    box-shadow:
        0 6px 16px rgba(0,0,0,0.06),
        0 30px 70px -22px rgba(0,0,0,0.16),
        inset 0 1px 0 rgba(255,255,255,0.65);
}

/* ========== 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: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* 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: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

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

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); opacity: 0.98; }
header, .header, .navbar { background: transparent; }

@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; }
}