:root {
    --color-primary: #2f6fb3;
    --color-primary-dark: #1f4f86;
    --color-accent: #ff5a7a;
    --color-surface: #f6fbff;
    --color-text: #0e1a2b;
    --rgb-primary: 47,111,179;
    --rgb-accent: 255,90,122;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 22px;

    --shadow-sm: 0 3px 10px rgba(47,111,179,.10);
    --shadow-md: 0 10px 26px rgba(47,111,179,.12);
    --shadow-lg: 0 18px 48px rgba(47,111,179,.16);

    --shadow-float-1: 0 10px 24px rgba(47,111,179,.14), 0 2px 0 rgba(255,90,122,.10);
    --shadow-float-2: 0 18px 52px rgba(47,111,179,.18), 0 0 0 1px rgba(47,111,179,.10) inset;
    --shadow-inset: inset 0 1px 0 rgba(255,255,255,.65);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 520ms cubic-bezier(.2,.85,.25,1);
    --heading-weight: 650;
    --body-line-height: 1.6;
}

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-xl);
    box-shadow: var(--shadow-md), var(--shadow-inset);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(246,251,255,.86));
    border: 1px solid rgba(var(--rgb-primary), .18);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
    border: 1px solid rgba(var(--rgb-primary), .28);
    background: linear-gradient(180deg, rgba(47,111,179,.12), rgba(47,111,179,.04));
    color: var(--color-primary-dark);
    box-shadow: 0 10px 24px rgba(47,111,179,.10), 0 1px 0 rgba(255,255,255,.7) inset;
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-float-1);
    border-color: rgba(var(--rgb-accent), .35);
}

.hero, [class*="hero"], section:first-of-type {
    background: radial-gradient(1200px 600px at 10% 0%, rgba(255,90,122,.20), transparent 55%),
                radial-gradient(900px 520px at 90% 10%, rgba(47,111,179,.24), transparent 56%),
                linear-gradient(135deg, var(--color-primary) 0%, #154a7f 45%, #0d2b4a 100%);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.15);
}

.card { border: 1px solid rgba(var(--rgb-primary), .20); }

header, .header, .navbar { background: transparent; }

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

/* Page Layout: wide */
/* 超宽 */
.page-main { max-width: 1400px; margin: 0 auto; }

/* 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; }
}