/* ===== 导航栏 ===== */
.navbar { padding: 1rem 0; background: rgba(255,255,255,0.93); backdrop-filter: blur(14px); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid rgba(226,232,240,0.5); }
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em; background: linear-gradient(135deg, #0f172a, #2563eb); -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo-slogan { font-size: 0.8rem; font-weight: 500; color: #2563eb; letter-spacing: 0.08em; margin-left: 0.6rem; padding-left: 0.6rem; border-left: 1.5px solid #dbeafe; background: none; -webkit-background-clip: unset; background-clip: unset; }
.nav-links { display: flex; gap: 2rem; align-items: center; flex-wrap: wrap; }
.nav-links a { text-decoration: none; font-weight: 500; color: #334155; font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: #2563eb; }
.nav-btn { background: linear-gradient(135deg, #2563eb, #0891b2); color: #fff !important; padding: 0.5rem 1.3rem; border-radius: 40px; font-weight: 600; transition: transform 0.2s, box-shadow 0.2s; box-shadow: 0 4px 12px rgba(37,99,235,0.25); }
.nav-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(37,99,235,0.35); }
.hamburger { display:none; background:none; border:none; font-size:1.8rem; cursor:pointer; color:#0f172a; padding:0.2rem; line-height:1; z-index:120; }
@media (max-width:768px) { .hamburger { display:block; } .nav-container { position:relative; } .nav-links { display:none !important; position:absolute; top:calc(100% + 8px); right:0; width:220px; background:white; border:1px solid #e2e8f0; border-radius:16px; padding:0.5rem 0; box-shadow:0 12px 30px -8px rgba(0,0,0,0.12); z-index:110; flex-direction:column; gap:0; } .nav-links.open { display:flex !important; } .nav-links a { display:block; width:100%; text-align:left; padding:0.65rem 1.2rem; font-size:0.9rem; color:#334155; text-decoration:none; font-weight:500; } .nav-links a:hover { background:#f0f7ff; color:#2563eb; } .nav-links .nav-btn { margin:0.5rem 1rem; text-align:center; border-radius:40px; } }
.footer { background: #0f172a; padding: 3rem 0 2rem; color: #94a3b8; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2rem; }
.footer-brand .logo { color: white; font-size: 1.4rem; margin-bottom: 1rem; background: none; -webkit-background-clip: unset; background-clip: unset; }
.footer-brand .logo i { font-size: 1.5rem; }
.footer-brand p { font-size: 0.9rem; line-height: 1.6; max-width: 280px; }
.footer-col h5 { color: white; font-size: 1rem; margin-bottom: 1rem; font-weight: 600; }
.footer-col a { display: block; color: #94a3b8; text-decoration: none; font-size: 0.9rem; padding: 0.3rem 0; transition: color 0.2s; }
.footer-col a:hover { color: #60a5fa; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 1.5rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; font-size: 0.85rem; }
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; text-align: center; } }
@media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; text-align: center; } }