:root {
    --color-primary: #2f6b6a;
    --color-primary-dark: #1f4544;
    --color-accent: #ffb703;
    --color-surface: #f6fff9;
    --color-text: #10231e;

    --rgb-primary: 47,107,106;
    --rgb-accent: 255,183,3;

    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 4px;

    --shadow-sm: 2px 2px 0 rgba(18, 45, 35, .22);
    --shadow-md: 4px 4px 0 rgba(18, 45, 35, .26);
    --shadow-lg: 4px 4px 0 rgba(18, 45, 35, .32), 7px 7px 0 rgba(18, 45, 35, .10);

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 0.15s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
    --ring-color: rgba(255,183,3,.45);
}

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:
        4px 4px 0 rgba(18, 45, 35, .28),
        0 0 0 2px rgba(47, 107, 106, .12),
        10px 14px 22px rgba(16, 35, 30, .08);
    padding: var(--space-card);
    transition: var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        3px 3px 0 rgba(18, 45, 35, .22),
        0 0 0 2px rgba(47, 107, 106, .16);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255, 183, 3, .12);
}

/* ========== 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);
                    box-shadow:
                        4px 4px 0 rgba(18, 45, 35, .26),
                        0 0 0 2px rgba(47, 107, 106, .11),
                        12px 18px 26px rgba(16, 35, 30, .06);
                    border-radius: var(--radius-lg);
                }

/* features: grid-2 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--space-gap) * 1.5);
}
.feature-list .card {
    border-radius: var(--radius-sm);
    box-shadow:
        4px 4px 0 rgba(18, 45, 35, .24),
        0 0 0 2px rgba(255, 183, 3, .18),
        10px 14px 22px rgba(16, 35, 30, .06);
}

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero-content .card {
    border-radius: var(--radius-lg);
    box-shadow:
        4px 4px 0 rgba(18, 45, 35, .30),
        0 0 0 2px rgba(47, 107, 106, .14),
        18px 22px 28px rgba(16, 35, 30, .08);
}

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }
                .testimonial-list .card {
                    border-radius: var(--radius-sm);
                    box-shadow:
                        4px 4px 0 rgba(18, 45, 35, .22),
                        0 0 0 2px rgba(47, 107, 106, .12),
                        12px 18px 24px rgba(16, 35, 30, .06);
                }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid .card {
    border-radius: var(--radius-sm);
    box-shadow:
        4px 4px 0 rgba(18, 45, 35, .20),
        0 0 0 2px rgba(255, 183, 3, .14),
        10px 14px 20px rgba(16, 35, 30, .05);
}

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card {
    border-radius: var(--radius-md);
    box-shadow:
        4px 4px 0 rgba(18, 45, 35, .26),
        0 0 0 2px rgba(47, 107, 106, .12),
        10px 14px 20px rgba(16, 35, 30, .06);
}

/* 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:
        4px 4px 0 rgba(18, 45, 35, .25),
        0 0 0 2px rgba(255, 183, 3, .16),
        12px 16px 22px rgba(16, 35, 30, .07);
}

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }
.cta-inner .card {
    border-radius: var(--radius-lg);
    box-shadow:
        4px 4px 0 rgba(18, 45, 35, .32),
        0 0 0 2px rgba(47, 107, 106, .16),
        18px 22px 30px rgba(16, 35, 30, .10);
}

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

/* 条件性装饰 */
.card { border: 3px solid rgba(var(--rgb-primary), .14); background: var(--color-surface); }
header, .header, .navbar {
    background: transparent;
    box-shadow: none;
}

/* 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; }

    .card, [class*="card"] {
        border-radius: var(--radius-sm);
        box-shadow:
            3px 3px 0 rgba(18, 45, 35, .26),
            0 0 0 2px rgba(47, 107, 106, .11),
            10px 14px 20px rgba(16, 35, 30, .06);
    }
}