:root {
    --color-primary: #1f3a8a;
    --color-primary-dark: #10204a;
    --color-accent: #22c55e;
    --color-surface: #e8f6ff;
    --color-text: #0b1220;
    --rgb-primary: 31,58,138;
    --rgb-accent: 34,197,94;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 36px;
    --shadow-sm: 0 6px 18px rgba(var(--rgb-primary), .14);
    --shadow-md: 0 16px 40px rgba(var(--rgb-primary), .18), 0 3px 10px rgba(0,0,0,.10);
    --shadow-lg: 0 28px 80px rgba(var(--rgb-primary), .22), 0 10px 26px rgba(0,0,0,.12);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.48s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 650;
    --body-line-height: 1.65;

    --shadow-glow: 0 0 0 rgba(0,0,0,0);
    --ring: rgba(34,197,94,.35);
    --border-glass: rgba(20,40,80,.12);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background:
    radial-gradient(900px 420px at 18% 8%, rgba(34,197,94,.10), rgba(34,197,94,0) 60%),
    radial-gradient(680px 360px at 86% 22%, rgba(31,58,138,.14), rgba(31,58,138,0) 62%),
    linear-gradient(180deg, rgba(232,246,255,.92), rgba(232,246,255,.55));
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(255,255,255,.65); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 -1px 0 rgba(0,0,0,.06) inset,
        0 18px 55px rgba(var(--rgb-primary), .18),
        0 8px 22px rgba(15,23,42,.10);
    padding: var(--space-card);
    transition: filter var(--transition), transform var(--transition), box-shadow var(--transition), background var(--transition);
    background:
        linear-gradient(180deg, rgba(255,255,255,.72), rgba(255,255,255,.50));
    border: 1px solid rgba(var(--rgb-primary), .10);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition), color var(--transition), filter var(--transition);
    box-shadow:
        0 10px 26px rgba(var(--rgb-primary), .18),
        0 2px 10px rgba(2,6,23,.10);
    background:
        linear-gradient(135deg, rgba(34,197,94,.95), rgba(31,58,138,.95));
    color: rgba(255,255,255,.96);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 30px rgba(var(--rgb-accent), .20); }

/* ========== Section Layout Variants ========== */

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

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

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content, .hero-inner { filter: saturate(1.02); }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; align-items: center; }
.partner-grid { background:
    radial-gradient(500px 240px at 20% 20%, rgba(34,197,94,.12), rgba(34,197,94,0) 58%),
    radial-gradient(520px 260px at 85% 60%, rgba(31,58,138,.14), rgba(31,58,138,0) 60%);
    padding: 0;
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }
.stats-grid { align-items: baseline; }

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(900px 320px at 10% 10%, rgba(34,197,94,.35), rgba(34,197,94,0) 55%),
        radial-gradient(760px 360px at 90% 60%, rgba(255,255,255,.16), rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(31,58,138,1), rgba(16,32,74,1));
    color: rgba(255,255,255,.96);
    padding: 4rem 2rem;
    box-shadow:
        0 24px 90px rgba(var(--rgb-primary), .26),
        0 12px 30px rgba(0,0,0,.18),
        0 1px 0 rgba(255,255,255,.18) inset;
}

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
header, .header, .navbar {
    background: transparent;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 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; }
}