:root {
    --color-primary: #2a6fbd;
    --color-primary-dark: #16508f;
    --color-accent: #f97316;
    --color-surface: #f5fbff;
    --color-text: #0f172a;
    --rgb-primary: 42,111,189;
    --rgb-accent: 249,115,22;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 24px;

    --shadow-sm:
        0 1px 0 rgba(15, 23, 42, .06),
        0 8px 18px rgba(15, 23, 42, .08);
    --shadow-md:
        0 10px 26px rgba(2, 6, 23, .12),
        0 2px 8px rgba(2, 6, 23, .08),
        0 0 0 1px rgba(42, 111, 189, .10) inset;
    --shadow-lg:
        0 18px 44px rgba(2, 6, 23, .14),
        0 10px 22px rgba(2, 6, 23, .10),
        0 1px 0 rgba(255, 255, 255, .35) inset,
        0 0 0 1px rgba(249, 115, 22, .10) inset;

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);

    --heading-weight: 800;
    --body-line-height: 1.6;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(900px 360px at 12% -10%, rgba(42,111,189,.16), transparent 60%),
        radial-gradient(860px 420px at 90% 6%, rgba(249,115,22,.14), transparent 58%),
        linear-gradient(180deg, rgba(245,251,255,1) 0%, rgba(245,251,255,.92) 100%);
}

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-xl);
    box-shadow:
        0 22px 60px rgba(2, 6, 23, .14),
        0 10px 26px rgba(2, 6, 23, .10),
        0 1px 0 rgba(255, 255, 255, .42) inset,
        0 0 0 1px rgba(42, 111, 189, .14) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background:
        linear-gradient(180deg, rgba(255,255,255,.88) 0%, rgba(255,255,255,.72) 100%);
    border: 1px solid rgba(2, 6, 23, .05);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 14px 36px rgba(2, 6, 23, .12),
        0 0 0 1px rgba(42, 111, 189, .18) inset;
    background:
        linear-gradient(180deg, rgba(42,111,189,.10) 0%, rgba(42,111,189,.03) 100%);
    border: 1px solid rgba(42, 111, 189, .22);
    color: var(--color-primary-dark);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.65);
}

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

.card { border-left: 3px solid var(--color-primary); }

header, .header, .navbar { background: transparent; }

.feature-list {
    background: linear-gradient(180deg, rgba(249,115,22,.06), rgba(42,111,189,.04));
    border-radius: var(--radius-xl);
    box-shadow:
        0 22px 55px rgba(2, 6, 23, .10),
        0 0 0 1px rgba(249,115,22,.10) inset;
    border: 1px solid rgba(2,6,23,.05);
    padding: 0;
}

.hero-content {
    filter: saturate(1.03);
}

.partner-grid {
    box-shadow:
        0 16px 40px rgba(2, 6, 23, .10),
        0 0 0 1px rgba(42, 111, 189, .10) inset;
    border-radius: var(--radius-xl);
}

@keyframes partnerScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ========== 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: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* 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: 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: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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; }
}