:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #06b6d4;
    --color-surface: #f5f7ff;
    --color-text: #0b1220;
    --rgb-primary: 37,99,235;
    --rgb-accent: 6,182,212;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 10px 24px rgba(37,99,235,.14);
    --shadow-md: 0 18px 44px rgba(37,99,235,.14);
    --shadow-lg: 0 28px 70px rgba(37,99,235,.18);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 360ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

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);
    padding: var(--space-card);
    transition: var(--transition);
    box-shadow:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 18px 50px rgba(2,6,23,.10),
        0 10px 28px rgba(var(--rgb-primary),.14),
        0 2px 10px rgba(var(--rgb-accent),.08);
    background:
        linear-gradient(180deg, rgba(255,255,255,.78) 0%, rgba(255,255,255,.55) 100%),
        radial-gradient(1200px 420px at 20% -10%, rgba(var(--rgb-primary),.18), transparent 58%),
        radial-gradient(900px 360px at 95% 0%, rgba(var(--rgb-accent),.16), transparent 55%);
    border: 1px solid rgba(13,36,99,.10);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 10px 24px rgba(37,99,235,.18),
        0 1px 0 rgba(255,255,255,.6) inset;
}

a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.55); }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* 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: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(900px 360px at 12% 0%, rgba(var(--rgb-primary),.20), transparent 55%),
        radial-gradient(800px 320px at 100% 10%, rgba(var(--rgb-accent),.22), transparent 52%),
        linear-gradient(180deg, rgba(255,255,255,.80) 0%, rgba(245,247,255,.92) 100%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(255,255,255,.7) inset,
        0 28px 80px rgba(2,6,23,.10),
        0 18px 55px rgba(var(--rgb-primary),.15),
        0 10px 30px rgba(var(--rgb-accent),.10);
    border: 1px solid rgba(37,99,235,.12);
}

/* 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 1px 0 rgba(255,255,255,.75) inset,
        0 30px 95px rgba(2,6,23,.14),
        0 24px 75px rgba(var(--rgb-primary),.22),
        0 12px 38px rgba(var(--rgb-accent),.14);
    border-color: rgba(var(--rgb-primary), .22);
}

.card {
    border: 1px solid rgba(var(--rgb-primary), .12);
    overflow: hidden;
}

header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 14px 35px rgba(2,6,23,.08),
        0 8px 22px rgba(var(--rgb-primary),.10);
    border-bottom: 1px solid rgba(37,99,235,.10);
}

/* 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; }
}