:root {
    --brand-black: #000000;
    --brand-blue: #3669EF;
    --brand-blue-dark: #2851C7;
    --brand-blue-light: #5A8CF7;
    --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-fast: 0.2s ease;
    --brand-gray1: #666666;
    --brand-gray2: #F8F8F8;
    --brand-gray3: #E3E3E3;
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --brand-white: #FFFFFF;
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}
/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background-color: var(--brand-white); color: var(--brand-black); font-family: var(--font-family); font-size: 16px; -webkit-font-smoothing: antialiased; line-height: 1.6; -moz-osx-font-smoothing: grayscale; }
img { display: block; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { background: none; border: none; cursor: pointer; font-family: inherit; }
/* Container */
.container { margin: 0 auto; max-width: 1200px; padding: 20px; width: 100%; }
/* ======================================== Navigation ======================================== */
.navbar { left: 0; padding: 16px 0; position: fixed; right: 0; top: 0; transition: all var(--transition-slow); z-index: 1000; }
.navbar.scrolled { padding: 8px 0; }
.nav-container { align-items: center; display: flex; justify-content: space-between; margin: 0 auto; max-width: 1200px; padding: 0 24px; transition: all var(--transition-slow); }
.navbar.scrolled .nav-container { backdrop-filter: blur(12px); background: rgba(255, 255, 255, 0.95); border-radius: 50px; box-shadow: var(--shadow-lg); padding: 10px 24px; }
.logo { align-items: center; display: flex; gap: 10px; }
.logo-icon { align-items: center; background: rgba(255, 255, 255, 0.2); border-radius: 8px; color: var(--brand-white); display: flex; height: 36px; justify-content: center; transition: all var(--transition-normal); width: 36px; }
.navbar.scrolled .logo-icon { background: rgba(54, 105, 239, 0.1); color: var(--brand-blue); }
.logo-text { color: var(--brand-white); font-size: 20px; font-weight: 600; transition: color var(--transition-normal); }
.navbar.scrolled .logo-text { color: var(--brand-black); }
.logo-light { font-weight: 300; }
.logo-trademark { font-size: 10px; vertical-align: super; }
.nav-links { align-items: center; display: flex; gap: 4px; }
.nav-links a { border-radius: 20px; color: rgba(255, 255, 255, 0.9); font-size: 14px; font-weight: 500; padding: 8px 16px; transition: all var(--transition-normal); }
.nav-links a:hover, .nav-links a.active { background: rgba(255, 255, 255, 0.15); color: var(--brand-white); }
.navbar.scrolled .nav-links a { color: var(--brand-gray1); }
.navbar.scrolled .nav-links a:hover, .navbar.scrolled .nav-links a.active { background: rgba(54, 105, 239, 0.1); color: var(--brand-blue); }
.nav-cta { background: var(--brand-white); border-radius: 24px; color: var(--brand-blue); font-size: 14px; font-weight: 500; padding: 10px 24px; transition: all var(--transition-normal); }
.nav-cta:hover { box-shadow: var(--shadow-md); transform: scale(1.05); }
.navbar.scrolled .nav-cta { background: var(--brand-blue); color: var(--brand-white); }
/* Mobile Menu Button */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.mobile-menu-btn span { background: var(--brand-white); border-radius: 2px; height: 2px; transition: all var(--transition-normal); width: 24px; }
.navbar.scrolled .mobile-menu-btn span { background: var(--brand-black); }
/* Mobile Menu */
.mobile-menu { background: var(--brand-white); border-radius: 16px; box-shadow: var(--shadow-xl); left: 16px; opacity: 0; padding: 24px; position: fixed; right: 16px; top: 70px; transform: translateY(-10px); transition: all var(--transition-normal); visibility: hidden; z-index: 999; }
.mobile-menu.active { opacity: 1; transform: translateY(0); visibility: visible; }
.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; }
.mobile-menu a { border-radius: 8px; color: var(--brand-gray1); display: block; font-size: 17px; padding: 12px 16px; transition: all var(--transition-fast); }
.mobile-menu a:hover, .mobile-menu a.active { background: rgba(54, 105, 239, 0.1); color: var(--brand-blue); }
.mobile-cta {background: var(--brand-blue);border-radius: 24px;color: var(--brand-white) !important;display: block;font-size: 15px;font-weight: 500;margin-top: 16px;padding: 14px 24px;text-align: center;}
/* Footer */
.footer { background: #111827; color: var(--brand-white); overflow: hidden; position: relative; }
.footer-bg { background-image: radial-gradient(circle at 1px 1px, white 1px, transparent 0); background-size: 40px 40px; inset: 0; opacity: 0.05; position: absolute; }
.footer-grid { display: grid; gap: 60px; grid-template-columns: 1fr 1fr 1fr 1fr; padding: 80px 0; }
.footer-logo { align-items: center; display: flex; gap: 10px; margin-bottom: 20px; }
.footer-logo .logo-icon { background: rgba(54, 105, 239, 0.2); color: var(--brand-blue); }
.footer-logo .logo-text { color: var(--brand-white); }
.footer-desc { color: rgba(255, 255, 255, 0.6); font-size: 14px; line-height: 1.7; margin-bottom: 24px; max-width: 300px; }
.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.contact-row { align-items: center; color: rgba(255, 255, 255, 0.6); display: flex; font-size: 13px; gap: 10px; }
.contact-row svg { color: var(--brand-blue); flex-shrink: 0; }
.footer-links h4 { color: var(--brand-white); font-size: 16px; font-weight: 600; letter-spacing: 0.05em; margin-bottom: 20px; text-transform: uppercase; }
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { color: rgba(255, 255, 255, 0.6); font-size: 14px; transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--brand-white); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); }
.footer-bottom-content { align-items: center; color: rgba(255, 255, 255, 0.5); display: flex; font-size: 13px; justify-content: space-between; padding: 24px 0; }
.icp { color: rgba(255, 255, 255, 0.3); font-size: 12px; }
/* ======================================== Pagination分页 ======================================== */
.pagination { align-items: center; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 40px; }
.pagination-btn { align-items: center; background: var(--brand-white); border: 1px solid var(--brand-gray3); border-radius: 8px; color: var(--brand-gray1); display: flex; font-size: 14px; font-weight: 500; height: 40px; justify-content: center; min-width: 40px; padding: 0 12px; transition: all var(--transition-normal); }
.pagination-btn:hover:not(:disabled):not(.ellipsis) { background: rgba(54, 105, 239, 0.05); border-color: var(--brand-blue); color: var(--brand-blue); }
.pagination-btn.active { background: var(--brand-blue); border-color: var(--brand-blue); color: var(--brand-white); }
.pagination-btn:disabled { cursor: not-allowed; opacity: 0.5; }
.pagination-btn.ellipsis { background: transparent; border: none; cursor: default; }
.pagination-btn.prev, .pagination-btn.next { gap: 6px; padding: 0 16px; }

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-links, .nav-cta { display: none; }
    .mobile-menu-btn { display: flex; }
    .contact-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { gap: 40px; grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .hero { min-height: 40vh; }
    .qr-card { padding: 32px 24px; }
    .qr-code { height: 240px; width: 240px; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { gap: 25px; grid-template-columns: repeat(2, 1fr); padding: 40px 0;}
    .footer-bottom-content { flex-direction: column; gap: 8px; text-align: center; }
}

/* Mobile Menu Overlay 菜单遮罩*/
.mobile-menu-overlay {
    backdrop-filter: blur(4px);
    background: rgba(0, 0, 0, 0.5);
    inset: 0;
    opacity: 0;
    position: fixed;
    transition: all var(--transition-normal);
    visibility: hidden;
    z-index: 998;
}
.mobile-menu-overlay { background: linear-gradient(to right, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.4) 60%, transparent); inset: 0; position: absolute;}
.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}
/* 当菜单打开时禁止body滚动 */
body.menu-open {
    overflow: hidden;
}