:root {
    --color-primary: #2f6f5b;
    --color-primary-dark: #1f4f41;
    --color-accent: #59d6ff;
    --color-surface: #f6f8fb;
    --color-text: #0f3a30;
    --rgb-primary: 47,111,91;
    --rgb-accent: 89,214,255;
    --radius-sm: 3px;
    --radius-md: 10px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 0 rgba(15,58,48,.06), 0 10px 24px rgba(15,58,48,.06);
    --shadow-md: 0 2px 0 rgba(15,58,48,.05), 0 18px 40px rgba(15,58,48,.09), 0 1px 2px rgba(255,255,255,.65) inset;
    --shadow-lg: 0 4px 0 rgba(15,58,48,.04), 0 26px 60px rgba(15,58,48,.12), 0 2px 8px rgba(89,214,255,.10) inset;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 320ms cubic-bezier(.2,.85,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --shadow-soft-1: 0 1px 0 rgba(255,255,255,.9) inset;
    --shadow-soft-2: 0 22px 50px rgba(15,58,48,.10);
    --shadow-soft-3: 0 2px 10px rgba(15,58,48,.08);
    --card-bg: rgba(255,255,255,.92);
    --card-border: rgba(15,58,48,.08);
    --card-accent: rgba(89,214,255,.85);
    --focus-ring: rgba(89,214,255,.55);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f7fbff 0%, var(--color-surface) 40%, #f3f6fb 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:
        var(--shadow-soft-1),
        0 1px 0 rgba(15,58,48,.06),
        0 16px 36px rgba(15,58,48,.10),
        0 2px 10px rgba(255,255,255,.75) inset;
    padding: var(--space-card);
    background:
        radial-gradient(1200px 500px at 20% -10%, rgba(89,214,255,.10), rgba(255,255,255,0) 55%),
        radial-gradient(900px 420px at 110% 10%, rgba(47,111,91,.10), rgba(255,255,255,0) 50%),
        var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 10px 22px rgba(15,58,48,.10), 0 1px 0 rgba(255,255,255,.7) inset;
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.45); }

/* ========== 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-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 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; }
                .hero-content { position: relative; z-index: 1; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

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

/* 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);
    box-shadow:
        0 1px 0 rgba(255,255,255,.82) inset,
        0 2px 0 rgba(15,58,48,.04),
        0 30px 72px rgba(15,58,48,.15),
        0 2px 14px rgba(89,214,255,.16);
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 2px 12px rgba(89,214,255,.22); }
.card { border-left: 3px solid rgba(47,111,91,.95); }
header, .header, .navbar {
    background: transparent;
    backdrop-filter: saturate(110%) blur(10px);
    -webkit-backdrop-filter: saturate(110%) 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; }
}