:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #38bdf8;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 56,189,248;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 34px;
    --shadow-sm:
        0 1px 0 rgba(2, 6, 23, .06),
        0 2px 8px rgba(2, 6, 23, .06);
    --shadow-md:
        0 10px 24px rgba(2, 6, 23, .08),
        0 3px 10px rgba(2, 6, 23, .06),
        inset 0 1px 0 rgba(255, 255, 255, .65);
    --shadow-lg:
        0 18px 40px rgba(2, 6, 23, .12),
        0 8px 18px rgba(2, 6, 23, .08),
        inset 0 1px 0 rgba(255, 255, 255, .7);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1.25rem;
    --transition: 520ms cubic-bezier(.16, 1, .3, 1);
    --heading-weight: 650;
    --body-line-height: 1.8;
    --card-border-alpha: .11;
    --ring-color: rgba(59, 130, 246, .35);
}

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 18px 45px rgba(2, 6, 23, .10),
        0 6px 18px rgba(2, 6, 23, .07),
        inset 0 1px 0 rgba(255, 255, 255, .72);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
    border: 1px solid rgba(51, 65, 85, var(--card-border-alpha));
}
.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);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.55); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.55); align-items: center; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(900px 260px at 15% 10%, rgba(56,189,248,.25), rgba(56,189,248,0) 55%),
        radial-gradient(820px 260px at 85% 20%, rgba(37,99,235,.22), rgba(37,99,235,0) 58%),
        linear-gradient(180deg, #ffffff, var(--color-surface));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 26px 60px rgba(2, 6, 23, .10),
        0 10px 26px rgba(2, 6, 23, .08),
        inset 0 1px 0 rgba(255, 255, 255, .9);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 26px 70px rgba(2, 6, 23, .13),
        0 12px 26px rgba(2, 6, 23, .09),
        0 0 0 6px rgba(59, 130, 246, .06),
        inset 0 1px 0 rgba(255, 255, 255, .82);
    border-color: rgba(var(--rgb-primary), .22);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 10px 30px rgba(56, 189, 248, .28);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 340px at 15% 20%, rgba(56,189,248,.26), rgba(56,189,248,0) 55%),
        radial-gradient(920px 360px at 85% 15%, rgba(37,99,235,.24), rgba(37,99,235,0) 58%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 35%, #334155 70%, #0b1224 100%);
}
.card { border: 1px solid rgba(var(--rgb-primary), .10); }
header, .header, .navbar { background: transparent; }

/* 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: 2.5rem; --space-card: 1.1rem; --space-gap: 1rem; }
    .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; }
}