:root {
    --color-primary: #2b3655;
    --color-primary-dark: #111827;
    --color-accent: #ffb020;
    --color-surface: #f6f7fb;
    --color-text: #0f172a;
    --rgb-primary: 43,54,85;
    --rgb-accent: 255,176,32;
    --radius-sm: 0px;
    --radius-md: 1px;
    --radius-lg: 2px;
    --radius-xl: 3px;
    --shadow-sm: 4px 4px 0 rgba(var(--rgb-primary), 0.18);
    --shadow-md: 4px 4px 0 rgba(var(--rgb-primary), 0.26);
    --shadow-lg: 5px 5px 0 rgba(var(--rgb-primary), 0.34);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.15s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
    --shadow-ink: rgba(17, 24, 39, 0.55);
    --shadow-border: rgba(17, 24, 39, 0.18);
    --border-strong: rgba(17, 24, 39, 0.18);
    --focus-ring: rgba(255, 176, 32, 0.55);
    --hero-gradient-a: #0b1220;
    --hero-gradient-b: #1f2a44;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, rgba(246,247,251,1) 0%, rgba(246,247,251,0.85) 55%, rgba(246,247,251,1) 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0px 1px 0 rgba(17, 24, 39, 0.12); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .26), 8px 10px 24px rgba(17,24,39,.10), inset 0 0 0 2px rgba(var(--rgb-primary), .10); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition), filter var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition), filter var(--transition); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .22); border: 2px solid rgba(17,24,39,.18); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0px 1px 0 rgba(255,255,255,.35); }

/* ========== 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 > * { border-radius: var(--radius-sm); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .18); border: 2px solid rgba(17,24,39,.12); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; padding: 4px; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; border-radius: 2px; border: 2px solid rgba(17,24,39,.14); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .22), 10px 14px 28px rgba(17,24,39,.08); background: linear-gradient(180deg, rgba(246,247,251,1) 0%, rgba(246,247,251,0.85) 100%); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content { background: linear-gradient(135deg, rgba(11,18,32,.06) 0%, rgba(43,54,85,.06) 40%, rgba(255,176,32,.08) 100%); border-radius: 2px; padding: 10px; box-shadow: inset 0 0 0 2px rgba(17,24,39,.10); }

/* 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 > * { border-radius: 2px; border: 2px solid rgba(17,24,39,.14); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .22); background: linear-gradient(180deg, rgba(255,255,255,.86) 0%, rgba(246,247,251,1) 100%); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid > * { border-radius: 2px; border: 2px solid rgba(17,24,39,.12); background: rgba(246,247,251,.9); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .16); }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
                .faq-wrapper { padding: 10px; border-radius: 2px; box-shadow: inset 0 0 0 2px rgba(17,24,39,.10); background: linear-gradient(180deg, rgba(246,247,251,1) 0%, rgba(246,247,251,.92) 100%); }

/* 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; text-shadow: 3px 3px 0 rgba(17,24,39,.10); }
                .stats-grid > * { border-radius: 2px; border: 2px solid rgba(17,24,39,.14); background: linear-gradient(180deg, rgba(255,255,255,.9) 0%, rgba(246,247,251,1) 100%); box-shadow: 4px 4px 0 rgba(var(--rgb-primary), .24), 12px 16px 30px rgba(17,24,39,.08); }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, rgba(11,18,32,1) 0%, rgba(31,42,68,1) 50%, rgba(255,176,32,0.22) 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; color: rgba(255,255,255,.92); box-shadow: 4px 4px 0 rgba(0,0,0,.35), 0 18px 40px rgba(0,0,0,.18), inset 0 0 0 2px rgba(255,176,32,.22); }
.cta-inner * { color: inherit; text-shadow: 0px 1px 0 rgba(0,0,0,.28); }

/* 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(-4px); box-shadow: 5px 5px 0 rgba(var(--rgb-primary), .40), 0 22px 48px rgba(17,24,39,.16), inset 0 0 0 2px rgba(255,176,32,.16); border-color: rgba(255,176,32,.28); }
.card { border: 2px solid rgba(17,24,39,.14); background: linear-gradient(180deg, rgba(255,255,255,.88) 0%, rgba(246,247,251,1) 100%); }

/* Keep header transparent but strengthen contrast when used */
header, .header, .navbar { background: transparent; border-radius: 2px; box-shadow: none; }
header, .header, .navbar { outline: 2px solid rgba(255,176,32,.0); outline-offset: 0px; transition: outline-color var(--transition), box-shadow var(--transition); }

/* 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; padding: 2rem; }
}