:root {
    --color-primary: #2b2d42;
    --color-primary-dark: #14151f;
    --color-accent: #f97316;
    --color-surface: #f1f5f9;
    --color-text: #0b1220;
    --rgb-primary: 43,45,66;
    --rgb-accent: 249,115,22;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 220ms cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
    --color-border: rgba(15, 23, 42, 0.14);
    --color-border-strong: rgba(15, 23, 42, 0.22);
}

/* 基础覆盖 */
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: 6px; box-shadow: none; padding: var(--space-card); transition: var(--transition); background: #ffffff; border: 1px solid var(--color-border); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: 5px; transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); text-decoration: none; }

.card { border-left: 4px solid var(--color-primary); }
header, .header, .navbar { box-shadow: none; border-bottom: 1px solid rgba(15, 23, 42, 0.1); }

/* ========== 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"] { border-color: rgba(15, 23, 42, 0.12); }
                .news-grid .card:nth-child(3n+1) { border-left-color: var(--color-accent); }
                .news-grid .card:nth-child(3n+2) { border-left-color: #06b6d4; }
                .news-grid .card:nth-child(3n+3) { border-left-color: #8b5cf6; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }
                .feature-list .card, .feature-list [class*="card"] { border-radius: 6px; background: #fff; border: 1px solid rgba(15, 23, 42, 0.14); box-shadow: none; }
                .feature-list .card:nth-child(4n+1) { border-left-color: #06b6d4; }
                .feature-list .card:nth-child(4n+2) { border-left-color: var(--color-accent); }
                .feature-list .card:nth-child(4n+3) { border-left-color: #22c55e; }
                .feature-list .card:nth-child(4n+4) { border-left-color: #8b5cf6; }
                .feature-list::-webkit-scrollbar { height: 10px; }
                .feature-list::-webkit-scrollbar-track { background: rgba(15, 23, 42, 0.06); border-radius: 999px; }
                .feature-list::-webkit-scrollbar-thumb { background: rgba(15, 23, 42, 0.22); border-radius: 999px; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
                .hero-inner .card, .hero-inner [class*="card"] { border-radius: 6px; border: 1px solid rgba(15, 23, 42, 0.14); background: #fff; box-shadow: none; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list .card, .testimonial-list [class*="card"] { border-radius: 6px; background: #fff; box-shadow: none; border: 1px solid rgba(15, 23, 42, 0.14); }
.testimonial-list .card:nth-child(3n+1) { border-left-color: var(--color-accent); }
.testimonial-list .card:nth-child(3n+2) { border-left-color: #06b6d4; }
.testimonial-list .card:nth-child(3n+3) { border-left-color: #22c55e; }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
                .partner-grid .card, .partner-grid [class*="card"] { border-radius: 6px; border: 1px solid rgba(15, 23, 42, 0.12); background: #fff; box-shadow: none; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
                .faq-wrapper .card, .faq-wrapper [class*="card"] { border-radius: 6px; border: 1px solid rgba(15, 23, 42, 0.14); background: #fff; box-shadow: none; }
                .faq-wrapper .faq-card, .faq-wrapper [class*="faq"] { border-left-color: #8b5cf6; }

/* 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"] { border-radius: 6px; border: 1px solid rgba(15, 23, 42, 0.14); background: #fff; box-shadow: none; }
                .stats-grid .card:nth-child(2n+1) { border-left-color: var(--color-accent); }
                .stats-grid .card:nth-child(2n+2) { border-left-color: #06b6d4; }

/* cta: full-bg */
.cta-section { background: var(--color-primary); color: #ffffff; padding: 4rem 2rem; border-top: 1px solid rgba(255,255,255,0.12); border-bottom: 1px solid rgba(255,255,255,0.12); }
.cta-section .card, .cta-section [class*="card"] { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.16); box-shadow: none; border-radius: 6px; }

/* 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(0); box-shadow: none; border-color: var(--color-border-strong); }
a:not([class]):hover { color: var(--color-accent); }

/* Ensure decorative focus styles remain subtle */
.card:focus, [class*="card"]:focus { outline: 2px solid rgba(249,115,22,0.35); outline-offset: 2px; }

@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; }
}