:root {
    --color-primary: #1e4d5f;
    --color-primary-dark: #103543;
    --color-accent: #7cc4ff;
    --color-surface: #e8fbff;
    --color-text: #0f2230;
    --rgb-primary: 30,77,95;
    --rgb-accent: 124,196,255;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
    --shadow-card: 0 4px 10px rgba(10, 24, 38, 0.08), 0 18px 44px rgba(10, 24, 38, 0.10);
    --shadow-card-hover: 0 10px 26px rgba(10, 24, 38, 0.12), 0 28px 70px rgba(10, 24, 38, 0.14);
    --ring: rgba(124, 196, 255, 0.35);
    --outline: rgba(30, 77, 95, 0.25);
    --gradient-cta: linear-gradient(135deg, #1e4d5f 0%, #0f3b4a 48%, #2a6f87 100%);
}

/* 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: var(--shadow-card);
    padding: var(--space-card);
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid rgba(15, 34, 48, 0.08);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline-color: var(--outline);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: full-bg */
.cta-section {
    background: var(--gradient-cta);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow: 0 18px 60px rgba(16, 53, 67, 0.24);
    border-radius: var(--radius-xl);
}
.cta-section:hover { box-shadow: 0 22px 78px rgba(16, 53, 67, 0.28); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover), 0 0 0 6px rgba(124, 196, 255, 0.09);
}
.card { border-left: 3px solid var(--color-primary); }
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; }
}