:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-accent: #f97316;
    --color-surface: #f0f8ff;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 249,115,22;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 0px;
    --shadow-sm:
        4px 4px 0px rgba(2, 132, 199, .55),
        0px 2px 0px rgba(14, 165, 233, .25);
    --shadow-md:
        4px 4px 0px rgba(2, 132, 199, .60),
        0px 10px 26px rgba(14, 165, 233, .14),
        0px 2px 0px rgba(0, 0, 0, .08);
    --shadow-lg:
        4px 4px 0px rgba(2, 132, 199, .70),
        0px 18px 50px rgba(14, 165, 233, .18),
        0px 2px 0px rgba(0, 0, 0, .10);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.15s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
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:
        4px 4px 0px rgba(var(--rgb-primary), .55),
        0px 18px 44px rgba(var(--rgb-primary), .12),
        0px 2px 0px rgba(11, 18, 32, .10);
    padding: var(--space-card);
    transition: 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,.35);
}

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* 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: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* 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; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-3px);
    box-shadow:
        4px 4px 0px rgba(var(--rgb-primary), .75),
        0px 26px 70px rgba(var(--rgb-primary), .20),
        0px 2px 0px rgba(11, 18, 32, .12);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow:
        0 1px 0 rgba(255,255,255,.25),
        0 0 18px rgba(var(--rgb-accent), .22);
}
.card { border: 2px solid rgba(var(--rgb-primary), .18); background:
    linear-gradient(180deg, rgba(255,255,255,.78) 0%, rgba(240,248,255,.65) 100%);
}
header, .header, .navbar {
    background: transparent;
    border-radius: 0px;
}

/* 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; }
}