:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #22c55e;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 34,197,94;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 3px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.85rem;
    --transition: 160ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;

    --border-neutral: rgba(15, 23, 42, 0.12);
    --border-strong: rgba(15, 23, 42, 0.18);
    --ring: rgba(37, 99, 235, 0.35);
    --text-shadow: none;
}

body { color: var(--color-text); line-height: var(--body-line-height); text-shadow: var(--text-shadow); 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-xl); box-shadow: var(--shadow-md); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition); border: 1px solid var(--border-neutral); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover, a:not([class]):focus { outline: 2px solid var(--ring); outline-offset: 3px; }

:where(.news-grid, .feature-list, .hero-content, .testimonial-list, .partner-grid, .faq-list, .stats-grid, .cta-section, .page-main) { filter: none; }

.card:hover, [class*="card"]:hover { transform: translateY(-3px); box-shadow: none; border-color: var(--border-strong); }
.hero, [class*="hero"], section:first-of-type { background: #0ea5e9; }
header, .header, .navbar { background: transparent; }

.hero, [class*="hero"], section:first-of-type { color: rgba(255,255,255,0.98); }
.hero-content { text-shadow: none; }

.hero, [class*="hero"], section:first-of-type {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 55%, #0ea5e9 100%);
}

.card:hover, [class*="card"]:hover { opacity: 0.98; }

@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* 基础覆盖 */
:root { caret-color: var(--color-primary); accent-color: var(--color-primary); }

section, .section { backdrop-filter: none; }

@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: 0.95rem; --transition: 140ms cubic-bezier(.2,.8,.2,1); }
    .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; }
}

/* ========== 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); }
                .news-grid .card, .news-grid [class*="card"] { background: #ffffff; border-color: rgba(37, 99, 235, 0.18); }

/* 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; }
.hero-content .card, .hero-content [class*="card"] { background: rgba(255,255,255,0.92); border-color: rgba(255,255,255,0.38); color: #0b1220; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
                .testimonial-list .card, .testimonial-list [class*="card"] { background: #ffffff; border-color: rgba(34, 197, 94, 0.22); }
                .testimonial-list .card:hover, .testimonial-list [class*="card"]:hover { border-color: rgba(34, 197, 94, 0.42); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                .partner-grid .card, .partner-grid [class*="card"] { background: #ffffff; border-color: rgba(37, 99, 235, 0.18); }
                .partner-grid .card:hover, .partner-grid [class*="card"]:hover { border-color: rgba(37, 99, 235, 0.35); }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card, .faq-list [class*="card"] { background: #ffffff; border-color: rgba(15, 23, 42, 0.14); }

/* 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; }
                .stats-grid .card, .stats-grid [class*="card"] { background: #ffffff; border-color: rgba(15, 23, 42, 0.16); }
                .stats-grid .stat-value { color: #0f172a; text-shadow: none; }

/* cta: full-bg */
.cta-section { background: var(--color-primary); color: #fff; padding: 4rem 2rem; }
.cta-section .card, .cta-section [class*="card"] { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.28); color: rgba(255,255,255,0.98); }
.cta-section a { color: rgba(255,255,255,0.98); }
.cta-section .btn, .cta-section button[class*="btn"], .cta-section a[class*="btn"] { border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.35); }
.cta-section .btn:hover, .cta-section button[class*="btn"]:hover, .cta-section a[class*="btn"]:hover { border-color: rgba(255,255,255,0.6); transform: translateY(-1px); box-shadow: none; }

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