:root {
    --color-primary: #334155;
    --color-primary-dark: #0b1220;
    --color-accent: #a855f7;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 51,65,85;
    --rgb-accent: 168,85,247;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 22px;

    --shadow-sm: 0 2px 6px rgba(2,6,23,.06), 0 1px 2px rgba(2,6,23,.04);
    --shadow-md: 0 6px 14px rgba(2,6,23,.08), 0 2px 6px rgba(2,6,23,.05);
    --shadow-lg: 0 12px 30px rgba(2,6,23,.12), 0 6px 18px rgba(2,6,23,.08), 0 1px 2px rgba(2,6,23,.05);

    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;

    --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 15% -10%, rgba(168,85,247,.14), transparent 55%), radial-gradient(900px 520px at 85% 0%, rgba(14,165,233,.12), 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 4px 10px rgba(2,6,23,.06),
        0 18px 40px -14px rgba(2,6,23,.18),
        0 2px 0 rgba(255,255,255,.55) inset;
    padding: var(--space-card);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        border-color var(--transition),
        color var(--transition),
        filter var(--transition);
    border: 1px solid rgba(15,23,42,.06);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.78));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        border-color var(--transition),
        color var(--transition),
        opacity var(--transition);
    box-shadow: 0 10px 24px -14px rgba(2,6,23,.25);
    outline-color: rgba(168,85,247,.35);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.4); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }
                .news-grid > .post-card:nth-child(1),
                .news-grid > .card:nth-child(1) { box-shadow: 0 4px 10px rgba(14,165,233,.10), 0 20px 45px -18px rgba(2,6,23,.22), 0 2px 0 rgba(255,255,255,.7) inset; border-color: rgba(14,165,233,.20); }
                .news-grid > .post-card:nth-child(2),
                .news-grid > .card:nth-child(2) { box-shadow: 0 4px 10px rgba(168,85,247,.12), 0 20px 45px -18px rgba(2,6,23,.20), 0 2px 0 rgba(255,255,255,.7) inset; border-color: rgba(168,85,247,.22); }
                .news-grid > .post-card:nth-child(3),
                .news-grid > .card:nth-child(3) { box-shadow: 0 4px 10px rgba(34,197,94,.11), 0 20px 45px -18px rgba(2,6,23,.19), 0 2px 0 rgba(255,255,255,.7) inset; border-color: rgba(34,197,94,.20); }
                .news-grid > .post-card:nth-child(4),
                .news-grid > .card:nth-child(4) { box-shadow: 0 4px 10px rgba(245,158,11,.12), 0 20px 45px -18px rgba(2,6,23,.20), 0 2px 0 rgba(255,255,255,.7) inset; border-color: rgba(245,158,11,.22); }
                .news-grid > .post-card:nth-child(5),
                .news-grid > .card:nth-child(5) { box-shadow: 0 4px 10px rgba(239,68,68,.10), 0 20px 45px -18px rgba(2,6,23,.22), 0 2px 0 rgba(255,255,255,.7) inset; border-color: rgba(239,68,68,.20); }
                .news-grid > .post-card,
                .news-grid > .card { background-clip: padding-box; }

/* 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-lg);
                    background: linear-gradient(180deg, rgba(255,255,255,.94), rgba(255,255,255,.76));
                    box-shadow:
                        0 4px 12px rgba(2,6,23,.06),
                        0 20px 44px -18px rgba(2,6,23,.20);
                    border-color: rgba(15,23,42,.06);
                }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content { text-shadow: 0 1px 0 rgba(255,255,255,.55); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
                .testimonial-list > * .card,
                .testimonial-list > * [class*="card"]{
                    background: linear-gradient(180deg, rgba(255,255,255,.94), rgba(255,255,255,.72));
                    box-shadow:
                        0 3px 10px rgba(2,6,23,.07),
                        0 24px 55px -30px rgba(2,6,23,.22);
                    border-color: rgba(15,23,42,.06);
                    border-radius: var(--radius-lg);
                }

/* 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"]{
                    box-shadow:
                        0 4px 10px rgba(2,6,23,.05),
                        0 18px 40px -22px rgba(2,6,23,.16);
                    border-color: rgba(15,23,42,.06);
                }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card,
.faq-list [class*="card"]{
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.74));
    box-shadow:
        0 4px 10px rgba(2,6,23,.06),
        0 22px 50px -26px rgba(2,6,23,.20);
    border-color: rgba(15,23,42,.06);
    border-radius: var(--radius-lg);
}

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card,
.stats-grid [class*="card"]{
    background:
        radial-gradient(120px 80px at 20% 10%, rgba(14,165,233,.14), transparent 60%),
        radial-gradient(160px 110px at 80% 0%, rgba(168,85,247,.14), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.74));
    box-shadow:
        0 4px 10px rgba(2,6,23,.06),
        0 22px 55px -26px rgba(2,6,23,.20);
    border-color: rgba(15,23,42,.06);
    border-radius: var(--radius-lg);
}

/* cta: full-bg */
.cta-section { background: linear-gradient(120deg, #1f2a44 0%, #0ea5e9 45%, #a855f7 100%); color: rgba(255,255,255,.96); padding: 4rem 2rem; position: relative; }
.cta-section:before{
    content:"";
    position:absolute;
    inset:-1px;
    background:
        radial-gradient(900px 400px at 20% 0%, rgba(255,255,255,.14), transparent 55%),
        radial-gradient(700px 360px at 85% 40%, rgba(255,255,255,.12), transparent 50%),
        linear-gradient(180deg, rgba(255,255,255,.06), rgba(0,0,0,.06));
    border-radius: 24px;
    pointer-events:none;
    opacity:.95;
}
.cta-section > * { position: relative; text-shadow: 0 10px 26px rgba(0,0,0,.25); }

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

/* 条件性装饰 */

/* 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; --radius-md: 12px; --radius-lg: 18px; }
    .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; }
}