:root {
    --color-primary: #2b3a55;
    --color-primary-dark: #141c28;
    --color-accent: #8a5cff;
    --color-surface: #f2f6ff;
    --color-text: #0f172a;
    --rgb-primary: 43,58,85;
    --rgb-accent: 138,92,255;
    --radius-sm: 3px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-sm: 0 1px 0 rgba(20,28,40,.14);
    --shadow-md: 0 14px 32px rgba(14,18,28,.18), 0 3px 10px rgba(14,18,28,.10);
    --shadow-lg: 0 26px 70px rgba(9,12,20,.24), 0 10px 28px rgba(9,12,20,.18);

    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;

    --transition: 420ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;

    --shadow-glow: 0 0 24px rgba(var(--rgb-accent), 0.38);
    --shadow-halo: 0 0 32px rgba(var(--rgb-accent), 0.60);

    --focus-ring: 0 0 0 3px rgba(var(--rgb-accent), 0.22), 0 0 24px rgba(var(--rgb-accent), 0.28);
    --border-soft: rgba(20,28,40,.10);
    --border-strong: rgba(20,28,40,.18);
}

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-lg);
    box-shadow:
        0 2px 0 rgba(255,255,255,.55) inset,
        0 14px 34px rgba(10,14,25,.14),
        0 1px 0 rgba(255,255,255,.35) inset;
    padding: var(--space-card);
    transition: var(--transition);
    outline: 1px solid transparent;
    backdrop-filter: saturate(1.02);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: 1px solid transparent;
    box-shadow:
        0 10px 22px rgba(11,15,28,.10),
        0 1px 0 rgba(255,255,255,.5) inset;
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.35);
}

:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 2px 0 rgba(255,255,255,.65) inset,
        0 10px 24px rgba(8,11,20,.18),
        0 0 24px rgba(var(--rgb-accent), 0.40),
        0 0 32px rgba(var(--rgb-accent), 0.55);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card {
                    display: grid;
                    grid-template-columns: 280px 1fr;
                    background:
                        linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.62));
                    border: 1px solid rgba(20,28,40,.10);
                    box-shadow:
                        0 2px 0 rgba(255,255,255,.6) inset,
                        0 18px 40px rgba(12,16,28,.14),
                        var(--shadow-glow);
                }

/* 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;
                }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid {
                    display: flex;
                    gap: 2rem;
                    overflow: hidden;
                    animation: partnerScroll 18s linear infinite;
                    filter: saturate(1.02);
                }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: two-column */
.faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-gap);
}
.faq-list > * {
    border-radius: var(--radius-lg);
}

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card {
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(245,248,255,.78));
    border: 1px solid rgba(20,28,40,.10);
    box-shadow:
        0 2px 0 rgba(255,255,255,.65) inset,
        0 16px 42px rgba(12,16,28,.12);
}

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1200px 420px at 20% 0%, rgba(138,92,255,0.20), rgba(138,92,255,0) 55%),
        radial-gradient(900px 360px at 95% 30%, rgba(59,130,246,0.18), rgba(59,130,246,0) 52%),
        linear-gradient(180deg, rgba(255,255,255,.86), rgba(235,242,255,.78));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    border: 1px solid rgba(20,28,40,.10);
    box-shadow:
        0 2px 0 rgba(255,255,255,.7) inset,
        0 26px 70px rgba(9,12,20,.16),
        0 0 24px rgba(var(--rgb-accent), 0.26);
}

/* 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: var(--shadow-lg); }

/* 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; }
}