:root {
    --color-primary: #1f6feb;
    --color-primary-dark: #1356b8;
    --color-accent: #f97316;
    --color-surface: #ffffff;
    --color-text: #132033;
    --rgb-primary: 31,111,235;
    --rgb-accent: 249,115,22;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 4px 10px rgba(17, 24, 39, 0.06);
    --shadow-md: 0 6px 18px rgba(17, 24, 39, 0.08), 0 2px 6px rgba(31, 111, 235, 0.06);
    --shadow-lg: 0 10px 26px rgba(17, 24, 39, 0.12), 0 1px 0 rgba(255,255,255,0.8) inset;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.38s cubic-bezier(.2,.85,.25,1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --card-surface: #ffffff;
    --bg-soft: #f3f5f9;
    --ring: rgba(31,111,235,0.32);
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(180deg, var(--bg-soft) 0%, #f7f9fc 45%, #f6f7fb 100%);
    caret-color: var(--color-primary);
    accent-color: var(--color-accent);
}

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 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(17, 24, 39, 0.12),
        0 0 0 1px rgba(31,111,235,0.06);
    background: var(--card-surface);
    padding: var(--space-card);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition),
        background var(--transition),
        filter var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,0.65);
}

.card, [class*="card"] {
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.card:hover, [class*="card"]:hover {
    transform: translateY(-5px);
    box-shadow:
        0 8px 18px rgba(0,0,0,0.06),
        0 28px 60px -16px rgba(17, 24, 39, 0.16),
        0 0 0 1px rgba(31,111,235,0.10);
    filter: saturate(1.02);
}

a:not([class]):hover { color: var(--color-accent); }

.card { border: 1px solid rgba(var(--rgb-primary), .10); }

header, .header, .navbar {
    box-shadow:
        0 2px 10px rgba(17, 24, 39, 0.06),
        0 10px 26px -14px rgba(31,111,235,0.22);
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(31,111,235,0.10);
}

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

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

/* 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 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1200px 500px at 10% 0%, rgba(31,111,235,0.10) 0%, rgba(31,111,235,0.00) 45%),
        radial-gradient(900px 400px at 90% 10%, rgba(249,115,22,0.10) 0%, rgba(249,115,22,0.00) 48%),
        linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 10px 30px rgba(17,24,39,0.08),
        0 0 0 1px rgba(31,111,235,0.10);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; 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; --radius-lg: 18px; --radius-xl: 24px; }
    .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; }
}