:root {
    --color-primary: #4338ca;
    --color-primary-dark: #312e81;
    --color-accent: #06b6d4;
    --color-surface: #eef2ff;
    --color-text: #14123a;
    --rgb-primary: 67,56,202;
    --rgb-accent: 6,182,212;
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 16px;
    --shadow-sm: 0 0 0 1px rgba(67,56,202,.10), 0 2px 10px rgba(6,182,212,.18);
    --shadow-md: 0 0 16px rgba(6,182,212,.28), 0 4px 18px rgba(67,56,202,.16);
    --shadow-lg: 0 0 28px rgba(6,182,212,.40), 0 8px 36px rgba(67,56,202,.24);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.45s cubic-bezier(0.22, 1.25, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(180deg, #f5f3ff 0%, #ecfeff 100%);
    accent-color: var(--color-primary);
    caret-color: var(--color-accent);
}
h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    color: var(--color-primary-dark);
    text-shadow: 0 0 20px rgba(6,182,212,.28);
}
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: inset 0 0 0 1px rgba(67,56,202,.14), var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(160deg, #ffffff 0%, #f8f7ff 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 0 18px rgba(6,182,212,.35), 0 2px 10px rgba(67,56,202,.20);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: var(--color-accent);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: centered */
.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    filter: drop-shadow(0 0 28px rgba(6,182,212,.20));
}

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; }
                .testimonial-list > * { flex: 0 0 100%; }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value {
                    font-size: 3rem;
                    color: var(--color-accent);
                    text-shadow: 0 0 22px rgba(6,182,212,.55), 0 0 46px rgba(67,56,202,.30);
                }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 14px rgba(6,182,212,.50);
}
header, .header, .navbar {
    background: transparent;
    backdrop-filter: saturate(140%) blur(6px);
}

/* 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; }
}