:root {
    --color-primary: #1b3a5a;
    --color-primary-dark: #07121f;
    --color-accent: #ff6b6b;
    --color-surface: #f6fbff;
    --color-text: #061424;

    --rgb-primary: 27,58,90;
    --rgb-accent: 255,107,107;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 10px 22px rgba(6,20,36,.10);
    --shadow-md: 0 14px 30px rgba(6,20,36,.14), 0 4px 10px rgba(6,20,36,.08), inset 0 1px 0 rgba(255,255,255,.55);
    --shadow-lg: 0 22px 54px rgba(6,20,36,.18), 0 10px 24px rgba(6,20,36,.12), 0 2px 6px rgba(6,20,36,.08), inset 0 1px 0 rgba(255,255,255,.62);

    --space-section: 5.25rem;
    --space-card: 2.25rem;
    --space-gap: 1.75rem;

    --transition: 240ms cubic-bezier(.2,.85,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.72;
}

/* 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 22px 48px rgba(6,20,36,.14),
        0 8px 20px rgba(6,20,36,.10),
        0 2px 6px rgba(6,20,36,.08),
        inset 0 1px 0 rgba(255,255,255,.7);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), opacity var(--transition);
}

:root { --page-bg-a: #f7fbff; --page-bg-b: #fff4f4; }

/* ========== 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: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* 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: 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; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1200px 420px at 10% 15%, rgba(255,107,107,.22) 0%, rgba(255,107,107,0) 52%),
        radial-gradient(900px 340px at 95% 30%, rgba(77,160,255,.20) 0%, rgba(77,160,255,0) 55%),
        linear-gradient(145deg, #ffffff 0%, #f6fbff 45%, #fff4f4 100%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 28px 70px rgba(6,20,36,.16),
        0 12px 28px rgba(6,20,36,.10),
        inset 0 1px 0 rgba(255,255,255,.72),
        inset 0 -1px 0 rgba(6,20,36,.05);
    border: 1px solid rgba(27,58,90,.12);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 10px 26px rgba(255,107,107,.28), 0 2px 8px rgba(255,107,107,.18);
    opacity: .98;
}
.card { border: 1px solid rgba(27,58,90, .18); }
header, .header, .navbar { background: transparent; }

@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: 2.25rem; --space-card: 1.1rem; --space-gap: 0.95rem; }
    .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; }
}