:root {
    --color-primary: #1f6f7a;
    --color-primary-dark: #0f4b55;
    --color-accent: #ffb86b;
    --color-surface: #f3fbff;
    --color-text: #0b2a2f;
    --rgb-primary: 31,111,122;
    --rgb-accent: 255,184,107;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 6px rgba(8, 22, 31, 0.10), 0 1px 2px rgba(8, 22, 31, 0.06);
    --shadow-md: 0 4px 10px rgba(8, 22, 31, 0.10), 0 18px 35px -14px rgba(8, 22, 31, 0.16), 0 1px 0 rgba(255, 255, 255, 0.35) inset;
    --shadow-lg: 0 8px 22px rgba(8, 22, 31, 0.12), 0 26px 70px -24px rgba(8, 22, 31, 0.22), 0 1px 0 rgba(255, 255, 255, 0.42) inset;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
    --color-border: rgba(9, 33, 40, 0.14);
    --color-glow: rgba(255, 184, 107, 0.22);
    --shadow-soft: 0 4px 8px rgba(0,0,0,0.05), 0 20px 40px -10px rgba(0,0,0,0.12);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px 500px at 15% -10%, rgba(31,111,122,0.18), transparent 55%), radial-gradient(800px 500px at 90% 0%, rgba(255,184,107,0.16), transparent 60%), var(--color-surface); }
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: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    border: 1px solid rgba(9, 33, 40, 0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.78), rgba(255,255,255,0.55));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid rgba(9, 33, 40, 0.12);
    background: linear-gradient(180deg, rgba(255,255,255,0.85), rgba(255,255,255,0.62));
    box-shadow: 0 10px 25px -18px rgba(9, 33, 40, 0.25);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 18px var(--color-glow); }

/* ========== 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); }
.hero-content { text-align: left; max-width: 600px; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 6px; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; border-radius: var(--radius-md); border: 1px solid rgba(9, 33, 40, 0.10); background: linear-gradient(180deg, rgba(255,255,255,0.72), rgba(255,255,255,0.48)); box-shadow: 0 6px 18px rgba(8, 22, 31, 0.08); }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
                .testimonial-list > * { border-radius: var(--radius-lg); border: 1px solid rgba(9, 33, 40, 0.10); background: linear-gradient(180deg, rgba(255,255,255,0.80), rgba(255,255,255,0.55)); box-shadow: var(--shadow-sm); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid > * { border-radius: var(--radius-md); border: 1px solid rgba(9, 33, 40, 0.10); padding: 14px 12px; background: linear-gradient(180deg, rgba(255,255,255,0.78), rgba(255,255,255,0.52)); box-shadow: 0 8px 22px -18px rgba(8, 22, 31, 0.22); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list > * { border-radius: var(--radius-lg); border: 1px solid rgba(9, 33, 40, 0.10); background: linear-gradient(180deg, rgba(255,255,255,0.80), rgba(255,255,255,0.50)); box-shadow: var(--shadow-sm); }

/* 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; letter-spacing: -0.02em; background: linear-gradient(135deg, rgba(31,111,122,1), rgba(15,75,85,1) 55%, rgba(255,184,107,0.95)); -webkit-background-clip: text; background-clip: text; color: transparent; text-shadow: 0 10px 30px rgba(15, 75, 85, 0.14); }
                .stats-grid > * { border-radius: var(--radius-lg); border: 1px solid rgba(9, 33, 40, 0.10); background: linear-gradient(180deg, rgba(255,255,255,0.78), rgba(255,255,255,0.50)); box-shadow: var(--shadow-soft); }

/* cta: full-bg */
.cta-section { background: radial-gradient(900px 320px at 10% 10%, rgba(255,184,107,0.24), transparent 55%), radial-gradient(800px 320px at 90% 30%, rgba(134,239,172,0.20), transparent 58%), linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 65%); color: #ffffff; padding: 4rem 2rem; box-shadow: 0 22px 80px -35px rgba(0,0,0,0.35); border-top: 1px solid rgba(255,255,255,0.18); border-bottom: 1px solid rgba(0,0,0,0.10); }
.cta-section * { border-color: rgba(255,255,255,0.16); }

/* 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: linear-gradient(135deg, #0f5d6a 0%, #0f4b55 45%, rgba(255,184,107,0.22) 100%); border-radius: var(--radius-xl); border: 1px solid rgba(255,255,255,0.18); box-shadow: 0 22px 70px -35px rgba(0,0,0,0.30), 0 8px 18px rgba(8, 22, 31, 0.10); }
header, .header, .navbar { box-shadow: 0 4px 18px rgba(0,0,0,.08), 0 16px 50px -24px rgba(0,0,0,.25); border-bottom: 1px solid rgba(9, 33, 40, 0.10); background: linear-gradient(180deg, rgba(255,255,255,0.82), rgba(255,255,255,0.60)); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }

/* 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; }
}