:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-accent: #22c55e;
    --color-surface: #f0f9ff;
    --color-text: #052235;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --shadow-sm: 0 0 0 rgba(0,0,0,0);
    --shadow-md:
        0 1px 0 rgba(3, 105, 161, .18),
        0 6px 16px rgba(2, 132, 199, .14),
        0 2px 6px rgba(5, 33, 53, .08);
    --shadow-lg:
        0 2px 0 rgba(2, 132, 199, .22),
        0 10px 30px rgba(2, 132, 199, .18),
        0 4px 14px rgba(5, 33, 53, .10);
    --space-section: 3.2rem;
    --space-card: 1rem;
    --space-gap: 1rem;
    --transition: 260ms cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 760;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 800px at 20% -10%, rgba(14,165,233,.10), transparent 55%), radial-gradient(900px 600px at 90% 0%, rgba(34,197,94,.09), transparent 50%), var(--color-surface); }
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 1px 0 rgba(14,165,233,.20),
        0 2px 0 rgba(5, 33, 53, .05),
        0 10px 22px rgba(2, 132, 199, .14);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition), filter var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.80));
    border-color: rgba(var(--rgb-primary), .16);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        color var(--transition),
        border-color var(--transition),
        filter var(--transition);
    box-shadow:
        0 1px 0 rgba(2,132,199,.20),
        0 8px 18px rgba(2,132,199,.14);
}
a:not([class]) { color: var(--color-primary); transition: color var(--transition), filter var(--transition), text-shadow var(--transition); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 12px rgba(34,197,94,.35); }

/* ========== 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);
                    border-radius: var(--radius-sm);
                    box-shadow:
                        0 1px 0 rgba(14,165,233,.18),
                        0 8px 18px rgba(2, 132, 199, .12);
                    background:
                        radial-gradient(700px 240px at 20% 0%, rgba(14,165,233,.14), transparent 55%),
                        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.78));
                }

/* 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; }
                .feature-list > * .card, .feature-list > *[class*="card"] {
                    border-radius: var(--radius-sm);
                    box-shadow:
                        0 1px 0 rgba(34,197,94,.16),
                        0 10px 26px rgba(34,197,94,.10),
                        0 2px 8px rgba(5,33,53,.08);
                }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content .card, .hero-content [class*="card"] {
    box-shadow:
        0 1px 0 rgba(14,165,233,.18),
        0 12px 30px rgba(2,132,199,.14),
        0 3px 10px rgba(5,33,53,.08);
    border-radius: var(--radius-sm);
}

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
                .testimonial-list .card, .testimonial-list [class*="card"] {
                    border-radius: var(--radius-sm);
                    box-shadow:
                        0 1px 0 rgba(34,197,94,.18),
                        0 8px 20px rgba(34,197,94,.12),
                        0 2px 8px rgba(5,33,53,.08);
                }

/* 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%); } }
                .partner-grid .card, .partner-grid [class*="card"] {
                    border-radius: var(--radius-sm);
                    box-shadow:
                        0 1px 0 rgba(14,165,233,.14),
                        0 9px 22px rgba(2,132,199,.10);
                    background:
                        linear-gradient(135deg, rgba(14,165,233,.14), rgba(255,255,255,.86) 45%, rgba(34,197,94,.10));
                }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card, .faq-list [class*="card"] {
    border-radius: var(--radius-sm);
    box-shadow:
        0 1px 0 rgba(14,165,233,.18),
        0 7px 18px rgba(2,132,199,.10);
}

/* 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; }
                .stats-grid .card, .stats-grid [class*="card"] {
                    border-radius: var(--radius-sm);
                    box-shadow:
                        0 1px 0 rgba(34,197,94,.18),
                        0 14px 36px rgba(34,197,94,.12),
                        0 3px 10px rgba(5,33,53,.08);
                }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 60%, #075985 100%); color: #f0fbff; padding: 4rem 2rem; }
.cta-section .card, .cta-section [class*="card"] {
    background: rgba(255,255,255,.10);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(240, 251, 255, .20);
    box-shadow:
        0 1px 0 rgba(255,255,255,.10),
        0 18px 40px rgba(0,0,0,.22);
    color: #eafffb;
}
.cta-section a:not([class]) { color: #c9f7ff; }
.cta-section a:not([class]):hover { color: #b7ffcf; text-shadow: 0 0 14px rgba(183,255,207,.35); }

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

/* 条件性装饰 */
.card { border: 1px solid rgba(var(--rgb-primary), .18); }
.news-grid .card { border-color: rgba(14,165,233,.18); }
.feature-list .card, .feature-list [class*="card"] { border-color: rgba(34,197,94,.18); }
.testimonial-list .card, .testimonial-list [class*="card"] { border-color: rgba(14,165,233,.16); }
.faq-list .card, .faq-list [class*="card"] { border-color: rgba(34,197,94,.16); }
.stats-grid .card, .stats-grid [class*="card"] { border-color: rgba(14,165,233,.16); }
.partner-grid .card, .partner-grid [class*="card"] { border-color: rgba(34,197,94,.16); }

/* 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: .9rem; --space-gap: 0.7rem; }
    .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; }
}