:root {
    --color-primary: #2f6b8b;
    --color-primary-dark: #1f4f67;
    --color-accent: #f97316;
    --color-surface: #f3f5f7;
    --color-text: #13202a;
    --rgb-primary: 47,107,139;
    --rgb-accent: 249,115,22;
    --radius-sm: 3px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(0,0,0,0.03);
    --shadow-md: 0 10px 26px rgba(19,32,42,0.10), 0 2px 6px rgba(19,32,42,0.06), 0 0 0 1px rgba(19,32,42,0.05);
    --shadow-lg: 0 18px 40px rgba(19,32,42,0.14), 0 5px 14px rgba(19,32,42,0.08), 0 0 0 1px rgba(19,32,42,0.06);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 520ms cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
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 1px 0 rgba(255,255,255,0.85) inset,
        0 16px 34px rgba(19,32,42,0.10),
        0 4px 12px rgba(19,32,42,0.06),
        0 0 0 1px rgba(19,32,42,0.05);
    background: rgba(255,255,255,0.86);
    padding: var(--space-card);
    transition: filter var(--transition), transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-primary-dark); }

@keyframes glowPulse {
    0% { opacity: 0.55; transform: translateZ(0) scale(1); filter: blur(0px); }
    50% { opacity: 0.85; transform: translateZ(0) scale(1.01); filter: blur(0.2px); }
    100% { opacity: 0.55; transform: translateZ(0) scale(1); filter: blur(0px); }
}

/* 基础覆盖 */
.card, [class*="card"]:hover {
    box-shadow:
        0 1px 0 rgba(255,255,255,0.9) inset,
        0 22px 50px rgba(19,32,42,0.14),
        0 8px 22px rgba(19,32,42,0.09),
        0 0 0 1px rgba(19,32,42,0.06),
        0 0 24px rgba(var(--rgb-accent), 0.28);
}
.card, [class*="card"]:hover {
    animation: glowPulse 1400ms cubic-bezier(0.22, 1, 0.36, 1) infinite;
}

.btn, button[class*="btn"], a[class*="btn"] {
    outline: 1px solid rgba(19,32,42,0.10);
    outline-offset: 2px;
    box-shadow: 0 10px 22px rgba(19,32,42,0.08), 0 0 0 1px rgba(19,32,42,0.06);
}
.btn:focus, button[class*="btn"]:focus, a[class*="btn"]:focus,
.card:focus, [class*="card"]:focus {
    outline: 2px solid rgba(var(--rgb-accent), 0.35);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.9) inset,
        0 18px 40px rgba(19,32,42,0.14),
        0 0 0 1px rgba(19,32,42,0.06),
        0 0 32px rgba(var(--rgb-accent), 0.45);
    filter: saturate(1.06);
}

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* 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: 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: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

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

/* 条件性装饰 */
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; }
}