:root {
    --color-primary: #1e40af;
    --color-primary-dark: #162c77;
    --color-accent: #3b82f6;
    --color-surface: #e0f2fe;
    --color-text: #0c172a;
    --rgb-primary: 30,64,175;
    --rgb-accent: 59,130,246;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 0 12px rgba(var(--rgb-accent), 0.25), 0 2px 6px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 0 24px rgba(var(--rgb-accent), 0.35), 0 6px 20px rgba(22, 44, 119, 0.3);
    --shadow-lg: 0 0 40px rgba(var(--rgb-accent), 0.4), 0 12px 36px rgba(22, 44, 119, 0.4);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.35s cubic-bezier(0.3, 0, 0.7, 1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
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);
    box-shadow:
      0 0 24px rgba(var(--rgb-accent), 0.4),
      0 6px 18px rgba(22,44,119, 0.28);
    padding: var(--space-card);
    transition: var(--transition);
}
.card:hover, [class*="card"]:hover {
    box-shadow:
      0 0 32px rgba(var(--rgb-accent), 0.6),
      0 10px 28px rgba(22,44,119, 0.45);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border-style: solid;
    border-color: rgba(var(--rgb-primary), 0.8);
}
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    border-color: rgba(var(--rgb-accent), 0.9);
    box-shadow: 0 0 24px rgba(var(--rgb-accent), 0.5);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 4px rgba(var(--rgb-primary), 0.4);
}
a:not([class]):hover {
    text-shadow: 0 0 8px rgba(var(--rgb-accent), 0.6);
}

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

/* news: featured-top */
/* 首篇横跨全宽 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-gap);
}
.news-grid > *:first-child {
    grid-column: span 3;
}

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

/* hero: split */
/* 左文右图 */
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

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

/* partners: scroll */
/* 自动滚动 */
.partner-grid {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    animation: partnerPulse 20s linear infinite;
}
@keyframes partnerPulse {
    0%, 100% {
        transform: translateX(0);
        filter: drop-shadow(0 0 4px rgba(var(--rgb-accent), 0.3));
    }
    50% {
        transform: translateX(-50%);
        filter: drop-shadow(0 0 12px rgba(var(--rgb-accent), 0.6));
    }
}

/* faq: single-column */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

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

/* 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 */
.hero, [class*="hero"], section:first-of-type {
    background: linear-gradient(135deg, #1e40af, #162c77);
    box-shadow: 0 0 24px rgba(var(--rgb-accent), 0.4);
    border-radius: var(--radius-xl);
    color: var(--color-surface);
    transition: var(--transition);
}
.hero:hover, [class*="hero"]:hover, section:first-of-type:hover {
    box-shadow: 0 0 32px rgba(var(--rgb-accent), 0.6);
    filter: drop-shadow(0 0 8px rgba(var(--rgb-accent), 0.5));
}

/* 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;
    }
}