:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #3730a3;
    --color-accent: #22c55e;
    --color-surface: #ecfeff;
    --color-text: #0f172a;
    --rgb-primary: 79,70,229;
    --rgb-accent: 34,197,94;
    --radius-sm: 9px;
    --radius-md: 14px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 10px 22px rgba(15,23,42,.10);
    --shadow-md: 0 18px 36px rgba(15,23,42,.14), 0 0 0 1px rgba(79,70,229,.22);
    --shadow-lg: 0 26px 70px rgba(15,23,42,.18), 0 0 0 1px rgba(34,197,94,.26);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 180ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --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-md);
    box-shadow:
        0 0 0 1px rgba(79,70,229,.26),
        0 14px 30px rgba(2,6,23,.16),
        0 0 28px rgba(79,70,229,.20);
    padding: var(--space-card);
    transition:
        var(--transition),
        box-shadow 260ms cubic-bezier(.2,.9,.2,1),
        transform 260ms cubic-bezier(.2,.9,.2,1),
        border-color 260ms cubic-bezier(.2,.9,.2,1);
}
.card:hover, [class*="card"]:hover {
    box-shadow:
        0 0 0 1px rgba(34,197,94,.32),
        0 20px 48px rgba(2,6,23,.18),
        0 0 32px rgba(34,197,94,.38),
        0 0 64px rgba(34,197,94,.18);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        var(--transition),
        box-shadow 260ms cubic-bezier(.2,.9,.2,1),
        transform 260ms cubic-bezier(.2,.9,.2,1),
        background-color 260ms cubic-bezier(.2,.9,.2,1),
        border-color 260ms cubic-bezier(.2,.9,.2,1);
    box-shadow:
        0 0 0 1px rgba(79,70,229,.22),
        0 10px 24px rgba(2,6,23,.14),
        0 0 18px rgba(79,70,229,.16);
}
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    box-shadow:
        0 0 0 1px rgba(34,197,94,.30),
        0 14px 30px rgba(2,6,23,.16),
        0 0 28px rgba(34,197,94,.28);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 18px rgba(34,197,94,.45);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: calc(var(--space-gap) * 0.9); }
                .news-grid .card {
                    break-inside: avoid;
                    margin-bottom: calc(var(--space-gap) * 1.05);
                    background:
                        linear-gradient(135deg, rgba(79,70,229,.10), rgba(236,254,255,.70) 55%, rgba(34,197,94,.08));
                    border-radius: calc(var(--radius-md) + 2px);
                }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: calc(var(--space-gap) * 0.55); 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"] {
                    box-shadow:
                        0 0 0 1px rgba(34,197,94,.22),
                        0 12px 26px rgba(2,6,23,.14),
                        0 0 26px rgba(34,197,94,.18);
                    border-radius: var(--radius-sm);
                }

/* hero: minimal */
.hero { padding: 2rem 0; }
.hero-content { max-width: 560px; }
.hero .card, .hero [class*="card"] {
    border-radius: 14px;
    background:
        radial-gradient(1000px 240px at 10% 10%, rgba(79,70,229,.20), rgba(236,254,255,.00) 55%),
        radial-gradient(720px 220px at 90% 0%, rgba(34,197,94,.18), rgba(236,254,255,.00) 60%),
        linear-gradient(180deg, rgba(236,254,255,.75), rgba(255,255,255,.55));
    box-shadow:
        0 0 0 1px rgba(79,70,229,.22),
        0 22px 55px rgba(2,6,23,.14),
        0 0 36px rgba(79,70,229,.20);
}

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }
                .testimonial-list > * .card, .testimonial-list > * [class*="card"] {
                    background:
                        linear-gradient(120deg, rgba(34,197,94,.12), rgba(236,254,255,.85) 45%, rgba(79,70,229,.12));
                    box-shadow:
                        0 0 0 1px rgba(79,70,229,.22),
                        0 16px 34px rgba(2,6,23,.14),
                        0 0 30px rgba(79,70,229,.16);
                }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid .card, .partner-grid [class*="card"] {
    border-radius: 12px;
    box-shadow:
        0 0 0 1px rgba(34,197,94,.24),
        0 10px 24px rgba(2,6,23,.12),
        0 0 22px rgba(34,197,94,.18);
    transition-duration: 220ms;
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card, .faq-list [class*="card"] {
    border-radius: 15px;
    box-shadow:
        0 0 0 1px rgba(79,70,229,.24),
        0 14px 34px rgba(2,6,23,.14),
        0 0 26px rgba(34,197,94,.14);
}

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card, .stats-grid [class*="card"] {
    border-radius: 13px;
    box-shadow:
        0 0 0 1px rgba(79,70,229,.22),
        0 18px 42px rgba(2,6,23,.15),
        0 0 28px rgba(79,70,229,.18);
}

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(900px 360px at 10% 10%, rgba(34,197,94,.40), rgba(34,197,94,0) 55%),
        radial-gradient(800px 320px at 90% 0%, rgba(79,70,229,.42), rgba(79,70,229,0) 58%),
        linear-gradient(180deg, rgba(79,70,229,.96), rgba(55,48,163,.96));
    color: #f8fafc;
    padding: 4rem 2rem;
    box-shadow:
        inset 0 0 0 1px rgba(255,255,255,.18),
        0 26px 75px rgba(2,6,23,.30),
        0 0 42px rgba(79,70,229,.25);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: "";
    position: absolute;
    inset: -2px;
    pointer-events: none;
    background:
        conic-gradient(from 180deg at 50% 50%,
            rgba(34,197,94,.00),
            rgba(34,197,94,.45),
            rgba(79,70,229,.55),
            rgba(34,197,94,.00));
    opacity: .55;
    filter: blur(16px);
    transform: translate3d(0,0,0);
}
.cta-section * { position: relative; }
.cta-section a:not([class]) { color: #eafff6; }
.cta-section a:not([class]):hover {
    color: #b9f6d3;
    text-shadow: 0 0 22px rgba(34,197,94,.55);
}

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }

/* 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; }
    .cta-section { border-radius: 18px; }
}