:root {
    --color-primary: #5b4cf0;
    --color-primary-dark: #2f237f;
    --color-accent: #ff8a5b;
    --color-surface: #f6f7fb;
    --color-text: #1f2440;
    --rgb-primary: 91,76,240;
    --rgb-accent: 255,138,91;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --shadow-sm: 0 4px 10px rgba(31,36,64,.06), 0 14px 28px -14px rgba(91,76,240,.24);
    --shadow-md: 0 8px 18px rgba(31,36,64,.08), 0 26px 46px -18px rgba(91,76,240,.22);
    --shadow-lg: 0 14px 28px rgba(31,36,64,.10), 0 34px 70px -22px rgba(255,138,91,.20);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.4s cubic-bezier(.22,1,.36,1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f6f7fb 0%, #eef2ff 100%); caret-color: var(--color-primary); accent-color: var(--color-accent); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #171b33; text-shadow: 0 1px 0 rgba(255,255,255,.7); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, rgba(255,255,255,.98), rgba(243,245,255,.94)); border-color: rgba(91,76,240,.14); border-style: solid; backdrop-filter: blur(8px); filter: saturate(1.05); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #5b4cf0 0%, #7c6cff 100%); color: #ffffff; border-color: rgba(47,35,127,.18); border-style: solid; box-shadow: 0 6px 14px rgba(91,76,240,.18), 0 18px 34px -18px rgba(47,35,127,.38); text-shadow: 0 1px 1px rgba(47,35,127,.28); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(255,138,91,.5); }

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

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* 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) * 1.5); 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: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #5b4cf0 0%, #8d7dff 48%, #ff8a5b 100%); color: #ffffff; box-shadow: inset 0 1px 0 rgba(255,255,255,.14), 0 18px 44px -24px rgba(47,35,127,.5); }
header, .header, .navbar { box-shadow: 0 6px 16px rgba(31,36,64,.06), 0 22px 44px -24px rgba(91,76,240,.24); background: rgba(255,255,255,.82); backdrop-filter: blur(12px); border-color: rgba(91,76,240,.1); border-style: solid; }

/* 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; }
}