:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #5b21b6;
    --color-accent: #22c55e;
    --color-surface: #f8fafc;
    --color-text: #0b1220;
    --rgb-primary: 124,58,237;
    --rgb-accent: 34,197,94;

    --radius-sm: 0;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;

    --shadow-sm: 0 8px 20px rgba(2, 6, 23, 0.10);
    --shadow-md: 0 18px 44px rgba(2, 6, 23, 0.16);
    --shadow-lg: 0 26px 70px rgba(2, 6, 23, 0.20);

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;

    --shadow-ink: rgba(2, 6, 23, 0.22);
    --shadow-glow: rgba(124, 58, 237, 0.22);
    --shadow-accent-glow: rgba(34, 197, 94, 0.22);
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 15% 0%, rgba(124, 58, 237, 0.10) 0%, rgba(124, 58, 237, 0) 55%), radial-gradient(900px 500px at 90% 10%, rgba(34, 197, 94, 0.10) 0%, rgba(34, 197, 94, 0) 60%), linear-gradient(180deg, #fbfdff 0%, var(--color-surface) 55%, #f5f7fb 100%); }

h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    position: relative;
}

.card, [class*="card"] {
    border-radius: var(--radius-xl);
    padding: var(--space-card);
    background:
        radial-gradient(800px 240px at 15% 0%, rgba(124, 58, 237, 0.20) 0%, rgba(124, 58, 237, 0) 55%),
        radial-gradient(520px 200px at 90% 10%, rgba(34, 197, 94, 0.18) 0%, rgba(34, 197, 94, 0) 55%),
        linear-gradient(180deg, rgba(255,255,255,0.92) 0%, rgba(255,255,255,0.78) 100%);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.75) inset,
        0 -1px 0 rgba(2, 6, 23, 0.06) inset,
        0 18px 50px rgba(2, 6, 23, 0.18),
        0 10px 24px rgba(124, 58, 237, 0.14),
        0 8px 18px rgba(34, 197, 94, 0.10);
    transition: var(--transition);
    border: 1px solid rgba(2, 6, 23, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: 999px;
    transition: var(--transition);
    box-shadow: 0 10px 24px rgba(2, 6, 23, 0.12);
    border: 1px solid rgba(2, 6, 23, 0.10);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
    outline: 1px solid transparent;
    outline-offset: 2px;
}

.card { border-left: 4px solid var(--color-primary); }

@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; --transition: 0.48s cubic-bezier(0.22, 1, 0.36, 1); }
    .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; }
}

/* ========== 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) * 1.05); }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2.2); max-width: 720px; margin: 0 auto; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2.25rem; align-items: center; }

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

/* 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%); } }

/* 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: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }