:root {
    --color-primary: #0ea5a4;
    --color-primary-dark: #0f3d3e;
    --color-accent: #38bdf8;
    --color-surface: #f1f5f9;
    --color-text: #0f172a;
    --rgb-primary: 14,165,164;
    --rgb-accent: 56,189,248;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --shadow-sm: 0 1px 0 rgba(var(--rgb-primary), .22), 0 2px 10px rgba(14,165,164,.10);
    --shadow-md: 0 1px 0 rgba(2,6,23,.20), 0 6px 16px rgba(14,165,164,.10), 0 10px 28px rgba(2,132,199,.06);
    --shadow-lg: 0 1px 0 rgba(2,6,23,.18), 0 10px 28px rgba(14,165,164,.10), 0 18px 50px rgba(56,189,248,.08);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 140ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #ffffff; }
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(15,23,42,.06),
        0 1px 0 rgba(255,255,255,.65) inset,
        0 8px 20px rgba(2,132,199,.10),
        0 18px 40px rgba(2,6,23,.06);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
    background: linear-gradient(180deg, rgba(241,245,249,.95), rgba(241,245,249,.80));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition), color var(--transition);
}
a:not([class]) { color: #0ea5a4; transition: var(--transition); text-decoration-color: rgba(14,165,164,.35); }
a:not([class]):hover { color: #0284c7; text-shadow: 0 0 14px rgba(56,189,248,.20); }

/* ========== 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);
                    border-radius: var(--radius-md);
                    box-shadow:
                        0 0 0 1px rgba(2,132,199,.10),
                        0 1px 0 rgba(255,255,255,.7) inset,
                        0 10px 22px rgba(14,165,164,.10);
                    background:
                        radial-gradient(120% 100% at 0% 0%, rgba(56,189,248,.14) 0%, rgba(56,189,248,0) 55%),
                        linear-gradient(180deg, rgba(241,245,249,.97), rgba(241,245,249,.78));
                }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list .card {
    border-radius: var(--radius-md);
    box-shadow:
        0 0 0 1px rgba(15,23,42,.06),
        0 8px 18px rgba(56,189,248,.10);
}

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1200px 520px at 12% 18%, rgba(56,189,248,.22) 0%, rgba(56,189,248,0) 55%),
        linear-gradient(135deg, #0b2a2b 0%, #072a3a 45%, #064e3b 100%);
    color: rgba(255,255,255,.92);
}
.hero .card, [class*="hero"] .card, section:first-of-type .card {
    background:
        linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.05));
    box-shadow:
        0 0 0 1px rgba(255,255,255,.16),
        0 10px 22px rgba(14,165,164,.14),
        0 26px 60px rgba(0,0,0,.22);
}

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * {
                    break-inside: avoid;
                    margin-bottom: var(--space-gap);
                }
.testimonial-list .card {
    border-radius: var(--radius-sm);
    box-shadow:
        0 0 0 1px rgba(56,189,248,.10),
        0 8px 18px rgba(14,165,164,.09);
    background:
        linear-gradient(180deg, rgba(255,255,255,.88), rgba(241,245,249,.72));
}

/* 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%); } }
.partner-grid .card, .partner-grid [class*="card"] {
    box-shadow:
        0 0 0 1px rgba(15,23,42,.06),
        0 10px 20px rgba(14,165,164,.08);
    border-radius: var(--radius-sm);
}

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card {
    border-radius: var(--radius-sm);
    box-shadow:
        0 0 0 1px rgba(2,6,23,.05),
        0 10px 26px rgba(2,132,199,.08);
}

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card {
    border-radius: var(--radius-sm);
    box-shadow:
        0 0 0 1px rgba(56,189,248,.10),
        0 10px 24px rgba(14,165,164,.09);
    background:
        radial-gradient(120% 80% at 50% 0%, rgba(56,189,248,.20) 0%, rgba(56,189,248,0) 58%),
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(241,245,249,.72));
}

/* cta: full-bg */
.cta-section { background: #0b1220; color: rgba(255,255,255,.95); padding: 4rem 2rem; }
.cta-section {
    background:
        radial-gradient(900px 320px at 15% 10%, rgba(56,189,248,.24) 0%, rgba(56,189,248,0) 55%),
        radial-gradient(900px 320px at 85% 30%, rgba(14,165,164,.20) 0%, rgba(14,165,164,0) 52%),
        linear-gradient(135deg, #071a2a 0%, #072e2a 55%, #07121f 100%);
    box-shadow:
        0 0 0 1px rgba(56,189,248,.10) inset,
        0 18px 50px rgba(2,6,23,.20);
}
.cta-section .card, .cta-section [class*="card"] {
    background:
        linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.04));
    box-shadow:
        0 0 0 1px rgba(255,255,255,.16),
        0 12px 28px rgba(56,189,248,.12),
        0 34px 80px rgba(0,0,0,.25);
    border-radius: var(--radius-sm);
}

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

/* 条件性装饰 */
header, .header, .navbar {
    box-shadow:
        0 0 0 1px rgba(15,23,42,.06),
        0 1px 0 rgba(255,255,255,.7) inset,
        0 10px 24px rgba(2,132,199,.10);
    background: rgba(255,255,255,.78);
    backdrop-filter: blur(10px) saturate(130%);
    -webkit-backdrop-filter: blur(10px) saturate(130%);
    border-radius: 8px;
    border-color: rgba(56,189,248,.14);
}

/* 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; --transition: 120ms cubic-bezier(.2,.95,.2,1); }
    .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; }
    .card, [class*="card"] { border-radius: 6px; box-shadow: 0 0 0 1px rgba(2,132,199,.08), 0 10px 22px rgba(14,165,164,.08); }
}