:root {
    --color-primary: #2a6fdb;
    --color-primary-dark: #174a9a;
    --color-accent: #7c3aed;
    --color-surface: #f3f6fb;
    --color-text: #1a2440;
    --rgb-primary: 42,111,219;
    --rgb-accent: 124,58,237;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;

    --shadow-sm: 0 1px 0 rgba(16,24,40,.06), 0 10px 18px rgba(16,24,40,.06);
    --shadow-md:
        0 1px 0 rgba(16,24,40,.05),
        0 10px 22px rgba(16,24,40,.08),
        0 2px 6px rgba(16,24,40,.06);
    --shadow-lg:
        0 1px 0 rgba(16,24,40,.06),
        0 18px 34px rgba(16,24,40,.12),
        0 6px 12px rgba(16,24,40,.08),
        0 0 0 1px rgba(124,58,237,.10);

    --space-section: 4.65rem;
    --space-card: 1.75rem;
    --space-gap: 1.55rem;

    --transition: 560ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 750;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px circle at 18% -10%, rgba(42,111,219,.10), transparent 55%), radial-gradient(850px circle at 88% 6%, rgba(124,58,237,.10), transparent 50%), var(--color-surface); }

h1, h2, h3, h4 { font-weight: var(--heading-weight); letter-spacing: -0.01em; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }

.card, [class*="card"] {
    border-radius: var(--radius-xl);
    background:
        linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(255,255,255,.94) 100%);
    border: 1px solid rgba(18,24,40,.08);
    box-shadow:
        0 1px 0 rgba(255,255,255,.75) inset,
        0 12px 28px rgba(16,24,40,.10),
        0 3px 10px rgba(16,24,40,.08);
    padding: var(--space-card);
    transition:
        transform 520ms cubic-bezier(.18,.84,.25,1),
        box-shadow 520ms cubic-bezier(.18,.84,.25,1),
        border-color 520ms cubic-bezier(.18,.84,.25,1),
        background 520ms cubic-bezier(.18,.84,.25,1);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition:
        transform 520ms cubic-bezier(.18,.84,.25,1),
        background 520ms cubic-bezier(.18,.84,.25,1),
        box-shadow 520ms cubic-bezier(.18,.84,.25,1),
        border-color 520ms cubic-bezier(.18,.84,.25,1),
        color 520ms cubic-bezier(.18,.84,.25,1);
    outline: 2px solid transparent;
    outline-offset: 3px;
    border: 1px solid rgba(18,24,40,.10);
}

a:not([class]) {
    color: var(--color-primary);
    transition:
        color 480ms cubic-bezier(.2,.9,.2,1),
        filter 480ms cubic-bezier(.2,.9,.2,1),
        text-shadow 480ms cubic-bezier(.2,.9,.2,1);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

a:not([class]):focus-visible,
.btn:focus-visible,
button[class*="btn"]:focus-visible {
    outline-color: rgba(124,58,237,.35);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card {
                    display: grid;
                    grid-template-columns: 280px 1fr;
                    border-radius: calc(var(--radius-xl) - 4px);
                    box-shadow:
                        0 1px 0 rgba(255,255,255,.7) inset,
                        0 16px 34px rgba(16,24,40,.10),
                        0 4px 12px rgba(16,24,40,.08);
                }

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

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

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

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    border-color: rgba(124,58,237,.22);
    box-shadow:
        0 1px 0 rgba(255,255,255,.75) inset,
        0 26px 56px rgba(16,24,40,.16),
        0 10px 22px rgba(16,24,40,.10),
        0 0 0 1px rgba(124,58,237,.14);
    background:
        linear-gradient(180deg, rgba(255,255,255,.99) 0%, rgba(255,255,255,.95) 100%);
}

a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 10px 22px rgba(124,58,237,.22);
    filter: saturate(1.05);
}

/* 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: 2.2rem; --space-card: 1.12rem; --space-gap: 0.95rem; --radius-md: 13px; --radius-lg: 18px; --radius-xl: 24px; }
    .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; }
}