:root {
    --color-primary: #1a73e8;
    --color-primary-dark: #175ac4;
    --color-accent: #0f9d58;
    --color-surface: #e8f5e9;
    --color-text: #223322;
    --rgb-primary: 26,115,232;
    --rgb-accent: 15,157,88;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 3px 6px rgba(15,157,88,0.3), 0 0 8px rgba(15,157,88,0.2);
    --shadow-md: 0 10px 20px rgba(15,157,88,0.35), 0 0 24px rgba(15,157,88,0.25);
    --shadow-lg: 0 25px 50px rgba(15,157,88,0.4), 0 0 32px rgba(15,157,88,0.3);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 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 8px 16px rgba(0, 0, 0, 0.1);
    padding: var(--space-card);
    transition: var(--transition);
}
.card:hover, [class*="card"]:hover {
    box-shadow:
        0 0 32px rgba(var(--rgb-accent), 0.6),
        0 12px 24px rgba(0, 0, 0, 0.15);
    filter: drop-shadow(0 0 8px rgba(var(--rgb-accent), 0.4));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border-style: solid;
    border-color: var(--color-primary-dark);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 2px rgba(26, 115, 232, 0.4);
}

/* ========== 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-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;
}

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

/* partners: centered */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

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

/* 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;
}

/* 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, #1a73e8 0%, #175ac4 100%);
    filter: drop-shadow(0 0 12px rgba(26, 115, 232, 0.5));
}
header, .header, .navbar {
    background: transparent;
}

/* 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; }
}