:root {
    --color-primary: #ef4444;
    --color-primary-dark: #b91c1c;
    --color-accent: #22c55e;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 239,68,68;
    --rgb-accent: 34,197,94;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 3px 10px rgba(2,6,23,.08), 0 1px 0 rgba(255,255,255,.35) inset;
    --shadow-md: 0 6px 18px rgba(2,6,23,.10), 0 2px 0 rgba(255,255,255,.45) inset;
    --shadow-lg: 0 10px 28px rgba(2,6,23,.14), 0 22px 60px -18px rgba(239,68,68,.22), 0 2px 0 rgba(255,255,255,.55) inset;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

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:
        0 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(0,0,0,0.12),
        0 1px 0 rgba(255,255,255,0.65) inset;
    padding: var(--space-card);
    transition:
        transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        background-color 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        border-color 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        filter 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(2,6,23,.08);
    background: rgba(255,255,255,0.68);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        background-color 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        border-color 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        color 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}
a:not([class]) {
    color: #ef4444;
    transition:
        color 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        text-shadow 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    text-shadow: 0 1px 0 rgba(255,255,255,.35);
}

/* ========== 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: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* 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: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

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

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, rgba(248,250,252,1) 0%, rgba(239,68,68,.06) 45%, rgba(34,197,94,.06) 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 10px 30px rgba(2,6,23,.10), 0 1px 0 rgba(255,255,255,.75) inset; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 6px 14px rgba(0,0,0,0.06),
        0 30px 70px -16px rgba(0,0,0,0.16),
        0 24px 70px -28px rgba(239,68,68,.30),
        0 2px 0 rgba(255,255,255,0.72) inset;
    border-color: rgba(var(--rgb-accent), .35);
    filter: saturate(1.05);
}
.card { border: 1px solid rgba(2,6,23, .10); }
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; }
}