:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #f97316;
    --color-surface: #f5f3ff;
    --color-text: #0b1020;
    --rgb-primary: 29,78,216;
    --rgb-accent: 249,115,22;

    --radius-sm: 0px;
    --radius-md: 4px;
    --radius-lg: 4px;
    --radius-xl: 6px;

    --shadow-sm:
        4px 4px 0 rgba(var(--rgb-primary), .28),
        0 1px 0 rgba(11,16,32,.08);
    --shadow-md:
        4px 4px 0 rgba(var(--rgb-primary), .35),
        7px 7px 0 rgba(249,115,22,.14),
        0 10px 26px rgba(11,16,32,.14);
    --shadow-lg:
        4px 4px 0 rgba(var(--rgb-primary), .45),
        10px 10px 0 rgba(249,115,22,.18),
        0 18px 40px rgba(11,16,32,.18);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 0.15s cubic-bezier(.2, .9, .2, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(1100px 700px at 18% -10%, rgba(var(--rgb-primary), .10) 0%, rgba(var(--rgb-primary), 0) 55%),
        radial-gradient(900px 520px at 92% 10%, rgba(var(--rgb-accent), .16) 0%, rgba(var(--rgb-accent), 0) 60%),
        linear-gradient(180deg, #ffffff 0%, #fbfbff 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:
        4px 4px 0 rgba(var(--rgb-primary), .38),
        -2px 2px 0 rgba(var(--rgb-accent), .18),
        0 12px 30px rgba(11,16,32,.14);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
    border: 2px solid rgba(11,16,32,.12);
    background:
        linear-gradient(135deg, rgba(255,255,255,.95) 0%, rgba(245,243,255,.85) 55%, rgba(255,255,255,.95) 100%);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
    border: 2px solid rgba(11,16,32,.14);
    box-shadow:
        3px 3px 0 rgba(var(--rgb-primary), .30),
        0 10px 22px rgba(11,16,32,.10);
    background:
        linear-gradient(180deg, rgba(255,255,255,.95) 0%, rgba(255,255,255,.75) 100%);
    color: #0b1020;
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
    text-decoration: none;
    border-bottom: 2px solid rgba(var(--rgb-primary), .35);
}
a:not([class]):hover {
    color: var(--color-primary-dark);
    text-shadow: 2px 2px 0 rgba(var(--rgb-accent), .22);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 8px; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 0.55); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 3fr 1fr; gap: 40px; align-items: center; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; align-items: center; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 8px; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
.card { 
    border-left: 3px solid var(--color-primary);
    border-top-color: rgba(var(--rgb-accent), .35);
    border-right-color: rgba(11,16,32,.10);
    border-bottom-color: rgba(11,16,32,.18);
    background:
        linear-gradient(135deg, rgba(29,78,216,.08) 0%, rgba(249,115,22,.06) 40%, rgba(255,255,255,.95) 100%);
}

header, .header, .navbar { background: transparent; }

/* Snappy sharp-edge interactions (decorative only) */
.card:hover {
    transform: translate(-1px, -1px);
    box-shadow:
        4px 4px 0 rgba(var(--rgb-primary), .55),
        -2px 2px 0 rgba(var(--rgb-accent), .25),
        0 18px 44px rgba(11,16,32,.18);
}

.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    transform: translate(-1px, -1px);
    box-shadow:
        4px 4px 0 rgba(var(--rgb-primary), .42),
        0 14px 30px rgba(11,16,32,.14);
    border-color: rgba(var(--rgb-primary), .55);
}

::selection {
    background: rgba(var(--rgb-accent), .25);
    color: #0b1020;
}

/* Caret/accent */
input[type="text"], textarea, select { caret-color: var(--color-accent); }

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: 2fr 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; }
}