:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #06b6d4;
    --color-surface: #ecfeff;
    --color-text: #0b1220;
    --rgb-primary: 29,78,216;
    --rgb-accent: 6,182,212;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-sm:
        0 1px 0 rgba(255,255,255,.55) inset,
        0 2px 10px rgba(2,132,199,.18);
    --shadow-md:
        0 10px 24px rgba(2,132,199,.12),
        0 6px 18px rgba(17,24,39,.08),
        0 2px 6px rgba(2,132,199,.10);
    --shadow-lg:
        0 18px 40px rgba(29,78,216,.16),
        0 10px 26px rgba(2,132,199,.14),
        0 4px 12px rgba(2,132,199,.10);

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 260ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.75;

    --ring-accent: rgba(6,182,212,.55);
    --ring-accent-strong: rgba(6,182,212,.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:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 10px 26px rgba(2,132,199,.14),
        0 6px 18px rgba(17,24,39,.08),
        0 0 0 1px rgba(29,78,216,.10);
    padding: var(--space-card);
    transition:
        box-shadow 260ms cubic-bezier(.2,.9,.2,1),
        transform 260ms cubic-bezier(.2,.9,.2,1),
        border-color 260ms cubic-bezier(.2,.9,.2,1),
        background-color 260ms cubic-bezier(.2,.9,.2,1);
}
.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 0 0 rgba(0,0,0,0);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card {
                    break-inside: avoid;
                    margin-bottom: var(--space-gap);
                }

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

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero {
                    position: relative;
                    min-height: 70vh;
                    display: flex;
                    align-items: center;
                    overflow: hidden;
                }
                .hero-content { position: relative; z-index: 1; }

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

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 420px at 20% 10%, rgba(6,182,212,.35), transparent 55%),
        radial-gradient(900px 360px at 85% 65%, rgba(29,78,216,.40), transparent 60%),
        linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #f6fbff;
    padding: 4rem 2rem;
    box-shadow:
        0 24px 60px rgba(29,78,216,.18),
        0 14px 34px rgba(2,132,199,.14),
        0 0 0 1px rgba(6,182,212,.18) inset;
}

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1000px 360px at 10% 0%, rgba(6,182,212,.40), transparent 58%),
        radial-gradient(900px 380px at 85% 50%, rgba(29,78,216,.35), transparent 60%),
        linear-gradient(135deg, #1d4ed8, #1e40af);
}
.card { border-left: 3px solid var(--color-accent); box-shadow: var(--shadow-md); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.55) inset,
        0 10px 26px rgba(2,132,199,.12),
        0 6px 18px rgba(17,24,39,.08);
}

/* Glow on interactive states (visual only) */
.card:hover, [class*="card"]:hover {
    box-shadow:
        0 1px 0 rgba(255,255,255,.62) inset,
        0 0 0 1px rgba(6,182,212,.24),
        0 14px 36px rgba(2,132,199,.20),
        0 0 24px rgba(6,182,212,.34);
    transform: translateY(-2px);
    animation: glowPulse 2.2s ease-in-out infinite;
}
a:hover { color: var(--color-accent); text-shadow: 0 0 18px rgba(6,182,212,.35); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 0 32px rgba(6,182,212,.35); }

/* 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; }
}

@keyframes glowPulse {
    0%, 100% {
        box-shadow:
            0 1px 0 rgba(255,255,255,.62) inset,
            0 0 0 1px rgba(6,182,212,.24),
            0 14px 36px rgba(2,132,199,.20),
            0 0 22px rgba(6,182,212,.26);
    }
    50% {
        box-shadow:
            0 1px 0 rgba(255,255,255,.62) inset,
            0 0 0 1px rgba(6,182,212,.30),
            0 18px 44px rgba(2,132,199,.26),
            0 0 32px rgba(6,182,212,.44);
    }
}