:root {
    --color-primary: #ef4444;
    --color-primary-dark: #b91c1c;
    --color-accent: #fb7185;
    --color-surface: #fdf2f2;
    --color-text: #4c0a0a;

    --rgb-primary: 239,68,68;
    --rgb-accent: 251,113,133;

    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 7px;
    --radius-xl: 10px;

    --shadow-sm: 0 1px 0 rgba(17,24,39,.08), 0 8px 22px rgba(185,28,28,.08);
    --shadow-md: 0 1px 0 rgba(17,24,39,.09), 0 10px 28px rgba(185,28,28,.10);
    --shadow-lg: 0 2px 0 rgba(17,24,39,.10), 0 18px 46px rgba(185,28,28,.14);

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

    --transition: 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

/* 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-xl);
    box-shadow:
        0 1px 0 rgba(17,24,39,.08),
        0 10px 30px rgba(185,28,28,.10),
        0 2px 10px rgba(239,68,68,.06);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.70));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1),
        box-shadow 0.28s cubic-bezier(0.2, 0.8, 0.2, 1),
        background-color 0.28s cubic-bezier(0.2, 0.8, 0.2, 1),
        color 0.28s cubic-bezier(0.2, 0.8, 0.2, 1),
        border-color 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}
a:not([class]):hover {
    color: var(--color-primary-dark);
    text-shadow: 0 0 18px rgba(239,68,68,.20);
}

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

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 18s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* 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: full-bg */
.cta-section {
    background: linear-gradient(135deg, #ef4444 0%, #b91c1c 55%, #7f1d1d 100%);
    color: #fff;
    padding: 4rem 2rem;
    box-shadow:
        0 2px 0 rgba(17,24,39,.10),
        0 22px 60px rgba(185,28,28,.22);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-2px);
    box-shadow:
        0 1px 0 rgba(17,24,39,.10),
        0 16px 42px rgba(185,28,28,.16),
        0 4px 18px rgba(239,68,68,.10);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 15% 10%, rgba(251,113,133,.35), rgba(251,113,133,0) 60%),
        linear-gradient(135deg, #ef4444, #b91c1c);
    color: rgba(255,255,255,.94);
}
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(17,24,39,.10),
        0 12px 28px rgba(17,24,39,.08);
    border-bottom: 1px solid rgba(239,68,68,.20);
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* 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; }
}