:root {
    --color-primary: #0ea5a4;
    --color-primary-dark: #0b6b6a;
    --color-accent: #06b6d4;
    --color-surface: #f0fdfa;
    --color-text: #0f1f2a;
    --rgb-primary: 14,165,164;
    --rgb-accent: 6,182,212;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 7px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .08), 0 1px 6px rgba(2, 132, 199, .10);
    --shadow-md: 0 1px 0 rgba(15, 23, 42, .08), 0 6px 16px rgba(2, 132, 199, .12);
    --shadow-lg: 0 1px 0 rgba(15, 23, 42, .10), 0 10px 26px rgba(2, 132, 199, .16), 0 0 0 1px rgba(13, 148, 136, .18);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

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 0 0 1px rgba(14, 165, 164, .18),
        0 1px 0 rgba(15, 23, 42, .06),
        0 8px 18px rgba(2, 132, 199, .10);
    padding: var(--space-card);
    transition: transform 220ms cubic-bezier(0.2, 0.85, 0.2, 1), box-shadow 220ms cubic-bezier(0.2, 0.85, 0.2, 1), filter 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
    background:
        linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.55));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 220ms cubic-bezier(0.2, 0.85, 0.2, 1), background-color 220ms cubic-bezier(0.2, 0.85, 0.2, 1), color 220ms cubic-bezier(0.2, 0.85, 0.2, 1), box-shadow 220ms cubic-bezier(0.2, 0.85, 0.2, 1), border-color 220ms cubic-bezier(0.2, 0.85, 0.2, 1);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), background-color var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* 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: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* 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(-3px);
    box-shadow:
        0 0 0 1px rgba(6, 182, 212, .26),
        0 1px 0 rgba(15, 23, 42, .08),
        0 14px 30px rgba(2, 132, 199, .16),
        0 0 24px rgba(14, 165, 164, .10);
    filter: saturate(1.03);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 1px 0 rgba(0,0,0,.06), 0 0 12px rgba(6, 182, 212, .25);
}
.card { border-left: 3px solid rgba(14, 165, 164, .95); }

/* 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; }
}