:root {
    --color-primary: #0ea5a4;
    --color-primary-dark: #0b6b69;
    --color-accent: #7c3aed;
    --color-surface: #f4f6fb;
    --color-text: #0f172a;
    --rgb-primary: 14,165,164;
    --rgb-accent: 124,58,237;
    --radius-sm: 3px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 10px 18px rgba(2, 6, 23, 0.08);
    --shadow-md: 0 18px 40px rgba(2, 6, 23, 0.10), 0 2px 0 rgba(255, 255, 255, 0.65) inset;
    --shadow-lg: 0 28px 70px rgba(2, 6, 23, 0.16), 0 0 0 1px rgba(124, 58, 237, 0.12) inset, 0 0 32px rgba(124, 58, 237, 0.22);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 1.25rem;
    --transition: 220ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 850;
    --body-line-height: 1.65;
    --halo: rgba(var(--rgb-accent), 0.55);
    --card-border: rgba(15, 23, 42, 0.10);
    --card-border-hover: rgba(124, 58, 237, 0.28);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, rgba(244,246,251,1) 0%, rgba(244,246,251,0.85) 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-lg);
    box-shadow:
        0 14px 34px rgba(2, 6, 23, 0.10),
        0 2px 0 rgba(255, 255, 255, 0.75) inset,
        0 0 0 1px rgba(var(--rgb-accent), 0.10);
    padding: var(--space-card);
    transition: var(--transition), box-shadow var(--transition), border-color var(--transition), transform var(--transition), filter var(--transition);
    background:
        radial-gradient(1200px 220px at 10% 0%, rgba(var(--rgb-accent), 0.10) 0%, rgba(255,255,255,0) 55%),
        radial-gradient(800px 260px at 90% 0%, rgba(var(--rgb-primary), 0.10) 0%, rgba(255,255,255,0) 60%),
        #ffffff;
    border: 1px solid var(--card-border);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition), color var(--transition);
    box-shadow: 0 10px 22px rgba(2, 6, 23, 0.10);
    border: 1px solid rgba(15, 23, 42, 0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.80) 100%);
    color: var(--color-text);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,0.6); }
a:not([class]):hover { color: rgba(14,165,164,0.95); }

/* ========== 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: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

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

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    border-color: var(--card-border-hover);
    box-shadow:
        0 34px 90px rgba(2, 6, 23, 0.18),
        0 0 0 1px rgba(var(--rgb-accent), 0.24) inset,
        0 0 28px rgba(var(--rgb-accent), 0.34),
        0 0 52px rgba(var(--rgb-primary), 0.14);
    filter: saturate(1.05);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1000px 420px at 10% 0%, rgba(var(--rgb-accent), 0.22) 0%, rgba(255,255,255,0) 55%),
        radial-gradient(900px 360px at 88% 10%, rgba(var(--rgb-primary), 0.18) 0%, rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(14,165,164,1) 0%, rgba(11,107,105,1) 52%, rgba(124,58,237,0.92) 110%);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.35);
}
.card { border: 1px solid rgba(var(--rgb-accent), .12); }

header, .header, .navbar {
    box-shadow:
        0 10px 26px rgba(2, 6, 23, 0.10),
        0 0 0 1px rgba(124, 58, 237, 0.10) inset;
    background: linear-gradient(180deg, rgba(255,255,255,0.92) 0%, rgba(255,255,255,0.78) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* subtle pulsing glow for cards (no layout change) */
@keyframes cardHaloPulse {
    0% { box-shadow:
        0 14px 34px rgba(2, 6, 23, 0.10),
        0 2px 0 rgba(255, 255, 255, 0.75) inset,
        0 0 0 1px rgba(var(--rgb-accent), 0.10),
        0 0 0 rgba(var(--rgb-accent), 0.0);
    }
    55% { box-shadow:
        0 16px 40px rgba(2, 6, 23, 0.12),
        0 2px 0 rgba(255, 255, 255, 0.75) inset,
        0 0 0 1px rgba(var(--rgb-accent), 0.13),
        0 0 18px rgba(var(--rgb-accent), 0.18);
    }
    100% { box-shadow:
        0 14px 34px rgba(2, 6, 23, 0.10),
        0 2px 0 rgba(255, 255, 255, 0.75) inset,
        0 0 0 1px rgba(var(--rgb-accent), 0.10),
        0 0 0 rgba(var(--rgb-accent), 0.0);
    }
}

/* apply pulse gently */
.card, [class*="card"] { animation: cardHaloPulse 6.5s ease-in-out infinite; }

/* 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: 1.25rem; }
    .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; }
}