:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e3a8a;
    --color-accent: #f97316;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 249,115,22;
    --radius-sm: 0;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 10px 22px rgba(2, 6, 23, .10), 0 2px 6px rgba(2, 6, 23, .06);
    --shadow-md: 0 18px 40px rgba(2, 6, 23, .12), 0 6px 14px rgba(2, 6, 23, .08), 0 1px 0 rgba(255,255,255,.55) inset;
    --shadow-lg: 0 26px 70px rgba(2, 6, 23, .14), 0 10px 26px rgba(2, 6, 23, .10), 0 1px 0 rgba(255,255,255,.65) inset;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;
}

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-xl);
    box-shadow:
        0 24px 60px rgba(2, 6, 23, .14),
        0 10px 26px rgba(2, 6, 23, .10),
        0 3px 10px rgba(2, 6, 23, .06),
        0 1px 0 rgba(255,255,255,.70) inset,
        0 -1px 0 rgba(255,255,255,.35) 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),
        opacity var(--transition);
}
.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),
        filter var(--transition),
        opacity var(--transition);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

:root {
    --card-bg-1: #ffffff;
    --card-bg-2: #eff6ff;
    --card-bg-3: #fff7ed;
    --card-bg-4: #ecfeff;
    --card-bg-5: #fdf2f8;
    --card-border-1: rgba(29,78,216,.35);
    --card-border-2: rgba(249,115,22,.35);
    --card-border-3: rgba(14,165,233,.35);
    --card-border-4: rgba(168,85,247,.30);
    --card-glow-1: rgba(29,78,216,.28);
    --card-glow-2: rgba(249,115,22,.26);
    --card-glow-3: rgba(14,165,233,.20);
    --card-glow-4: rgba(168,85,247,.20);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* 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: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 22s cubic-bezier(0.2, 0.8, 0.2, 1) 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: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { 
    background:
        radial-gradient(1200px 420px at 20% 0%, rgba(29,78,216,.42) 0%, rgba(29,78,216,0) 55%),
        radial-gradient(900px 360px at 78% 14%, rgba(249,115,22,.30) 0%, rgba(249,115,22,0) 60%),
        linear-gradient(135deg, #1d4ed8, #0b3b91);
    box-shadow:
        0 1px 0 rgba(255,255,255,.35) inset,
        0 -1px 0 rgba(255,255,255,.18) inset;
}
.card { border-left: 3px solid rgba(255,255,255,.15); }
.card:where(:not(.card--accent, .card--primary)) { border-left-color: rgba(29,78,216,.55); }
.card:where(:not(.card--accent, .card--primary)):nth-child(3n + 2) { border-left-color: rgba(249,115,22,.62); }
.card:where(:not(.card--accent, .card--primary)):nth-child(3n + 3) { border-left-color: rgba(14,165,233,.58); }

/* 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; }
}