:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e3a8a;
    --color-accent: #f97316;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 249,115,22;
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: none;
    --shadow-md:
        0 1px 0 rgba(15, 23, 42, 0.06),
        0 10px 22px rgba(15, 23, 42, 0.06);
    --shadow-lg:
        0 1px 0 rgba(15, 23, 42, 0.06),
        0 18px 42px rgba(2, 6, 23, 0.10);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 200ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

/* 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: var(--radius-lg);
    box-shadow:
        0 0 0 1px rgba(var(--rgb-primary), 0.10),
        0 1px 0 rgba(15, 23, 42, 0.04),
        0 10px 24px rgba(2, 6, 23, 0.06);
    padding: var(--space-card);
    transition:
        transform 240ms cubic-bezier(0.2, 0.8, 0.2, 1),
        box-shadow 240ms cubic-bezier(0.2, 0.8, 0.2, 1),
        border-color 240ms cubic-bezier(0.2, 0.8, 0.2, 1),
        background-color 240ms cubic-bezier(0.2, 0.8, 0.2, 1);
    background:
        linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,0.98) 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        background-color var(--transition),
        color var(--transition),
        transform 240ms cubic-bezier(0.2, 0.8, 0.2, 1),
        box-shadow 240ms cubic-bezier(0.2, 0.8, 0.2, 1),
        border-color var(--transition);
    outline-color: rgba(var(--rgb-primary), 0.55);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
}
a:not([class]):focus-visible { outline: 2px solid rgba(var(--rgb-primary), 0.35); outline-offset: 2px; }

.card:hover, [class*="card"]:hover {
    transform: translateY(-3px);
    box-shadow:
        0 0 0 1px rgba(var(--rgb-accent), 0.22),
        0 1px 0 rgba(15, 23, 42, 0.05),
        0 22px 58px rgba(2, 6, 23, 0.14);
    border-color: rgba(var(--rgb-accent), 0.25);
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 18px rgba(249,115,22,0.22); }
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
header, .header, .navbar { background: transparent; }

/* ========== 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); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

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

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 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; }
}