:root{--sci-fi-primary:#0a0a2a;--sci-fi-secondary:#1a1a3a;--sci-fi-accent:#00d4ff;--sci-fi-accent-glow:rgba(0,212,255,0.5);--sci-fi-danger:#ff2a6d;--sci-fi-success:#05d9e8;--sci-fi-warning:#ffcc00;--sci-fi-text:#fff;--sci-fi-text-secondary:#b0b0d0;--sci-fi-border:rgba(0,212,255,0.2);--sci-fi-bg:linear-gradient(135deg,#0a0a2a 0%,#1a1a3a 100%);--sci-fi-card-bg:rgba(26,26,58,0.8);--sci-fi-glow:0 0 20px rgba(0,212,255,0.3);--sci-fi-font-heading:'Orbitron','Segoe UI',sans-serif;--sci-fi-font-body:'Exo 2','Segoe UI',sans-serif;--sci-fi-pulse:pulse 2s infinite;--sci-fi-glow-animation:glow 3s infinite alternate;--sci-fi-scan:scan 4s linear infinite}.sci-fi-nav{background:var(--sci-fi-primary);border-bottom:1px solid var(--sci-fi-border);box-shadow:0 0 30px rgba(0,212,255,0.1);position:relative;overflow:hidden}.sci-fi-nav::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:2px;background:linear-gradient(90deg,transparent,var(--sci-fi-accent),transparent);animation:var(--sci-fi-scan)}.nav-container{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;max-width:1400px;margin:0 auto}.logo-wrapper{display:flex;align-items:center;gap:1rem;transition:all .3s ease}.logo-wrapper:hover{transform:translateY(-2px)}.logo-icon{font-size:2.5rem;animation:var(--sci-fi-pulse)}.logo-text{display:flex;flex-direction:column}.logo-title{font-family:var(--sci-fi-font-heading);font-size:1.8rem;font-weight:900;background:linear-gradient(90deg,var(--sci-fi-accent),var(--sci-fi-success));-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:1px;text-transform:uppercase}.logo-subtitle{font-family:var(--sci-fi-font-body);font-size:.8rem;color:var(--sci-fi-text-secondary);letter-spacing:3px;text-transform:uppercase}.nav-main{display:flex;gap:2rem;align-items:center}.nav-link{display:flex;align-items:center;gap:.5rem;color:var(--sci-fi-text);text-decoration:none;font-family:var(--sci-fi-font-body);font-weight:500;padding:.75rem 1.5rem;border-radius:8px;transition:all .3s ease;position:relative;overflow:hidden}.nav-link::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(0,212,255,0.1),transparent);transition:left .5s ease}.nav-link:hover::before{left:100%}.nav-link:hover{background:rgba(0,212,255,0.1);color:var(--sci-fi-accent);box-shadow:var(--sci-fi-glow)}.nav-link.active{background:rgba(0,212,255,0.15);color:var(--sci-fi-accent);box-shadow:var(--sci-fi-glow)}.nav-link i{font-size:1.1rem}.nav-dropdown{position:relative}.dropdown-arrow{font-size:.8rem;margin-left:.25rem;transition:transform .3s ease}.nav-dropdown:hover .dropdown-arrow{transform:rotate(180deg)}.dropdown-menu{position:absolute;top:100%;left:0;width:320px;background:var(--sci-fi-card-bg);backdrop-filter:blur(10px);border:1px solid var(--sci-fi-border);border-radius:12px;padding:1rem;box-shadow:0 20px 40px rgba(0,0,0,0.3),var(--sci-fi-glow);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s ease;z-index:1000}.nav-dropdown:hover .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-section{margin-bottom:1rem;padding-bottom:1rem;border-bottom:1px solid var(--sci-fi-border)}.dropdown-section:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.dropdown-header{display:flex;align-items:center;gap:.5rem;color:var(--sci-fi-accent);font-family:var(--sci-fi-font-heading);font-size:.9rem;font-weight:600;text-transform:uppercase;letter-spacing:1px;margin-bottom:.75rem;padding:.25rem 0}.dropdown-item{display:flex;align-items:center;gap:.75rem;color:var(--sci-fi-text);text-decoration:none;padding:.75rem 1rem;border-radius:6px;transition:all .2s ease;font-family:var(--sci-fi-font-body)}.dropdown-item:hover{background:rgba(0,212,255,0.1);color:var(--sci-fi-accent);transform:translateX(5px)}.dropdown-item i{width:20px;text-align:center;font-size:1rem}.nav-user{display:flex;align-items:center}.btn-sci-fi{display:flex;align-items:center;gap:.75rem;background:linear-gradient(90deg,var(--sci-fi-accent),var(--sci-fi-success));color:var(--sci-fi-primary);border:none;padding:.75rem 1.5rem;border-radius:8px;font-family:var(--sci-fi-font-heading);font-weight:700;font-size:.9rem;text-transform:uppercase;letter-spacing:1px;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.btn-sci-fi::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:left .5s ease}.btn-sci-fi:hover::before{left:100%}.btn-sci-fi:hover{transform:translateY(-2px);box-shadow:0 10px 20px rgba(0,212,255,0.3)}.btn-sci-fi:active{transform:translateY(0)}@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.8;transform:scale(1.05)}}@keyframes glow{0%{box-shadow:0 0 10px rgba(0,212,255,0.3)}100%{box-shadow:0 0 20px rgba(0,212,255,0.6),0 0 30px rgba(0,212,255,0.3)}}@keyframes scan{0%{left:-100%}100%{left:100%}}@media (max-width:1024px){.nav-container{padding:1rem}.nav-main{gap:1rem}.nav-link{padding:.5rem 1rem;font-size:.9rem}.dropdown-menu{width:280px}}@media (max-width:768px){.nav-container{flex-direction:column;gap:1rem}.nav-main{flex-wrap:wrap;justify-content:center}.dropdown-menu{position:fixed;top:auto;left:50%;transform:translateX(-50%) translateY(10px);width:90vw;max-width:400px}}body{font-family:var(--sci-fi-font-body);color:var(--sci-fi-text);background:var(--sci-fi-bg);min-height:100vh;margin:0;padding:0;overflow-x:hidden}.sci-fi-container{max-width:1400px;margin:0 auto;padding:2rem}.sci-fi-card{background:var(--sci-fi-card-bg);backdrop-filter:blur(10px);border:1px solid var(--sci-fi-border);border-radius:16px;padding:2rem;box-shadow:var(--sci-fi-glow);transition:all .3s ease}.sci-fi-card:hover{transform:translateY(-5px);box-shadow:0 20px 40px rgba(0,0,0,0.4),var(--sci-fi-glow)}.sci-fi-btn{display:inline-flex;align-items:center;gap:.5rem;background:rgba(0,212,255,0.1);color:var(--sci-fi-accent);border:1px solid var(--sci-fi-accent);padding:.75rem 1.5rem;border-radius:8px;font-family:var(--sci-fi-font-body);font-weight:600;text-decoration:none;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.sci-fi-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(0,212,255,0.2),transparent);transition:left .5s ease}.sci-fi-btn:hover::before{left:100%}.sci-fi-btn:hover{background:rgba(0,212,255,0.2);box-shadow:var(--sci-fi-glow);transform:translateY(-2px)}.sci-fi-btn-primary{background:linear-gradient(90deg,var(--sci-fi-accent),var(--sci-fi-success));color:var(--sci-fi-primary);border:none;font-weight:700}.sci-fi-btn-primary:hover{background:linear-gradient(90deg,var(--sci-fi-success),var(--sci-fi-accent))}.sci-fi-hero{min-height:80vh;display:flex;align-items:center;justify-content:center;text-align:center;position:relative;overflow:hidden}.sci-fi-hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 30% 30%,rgba(0,212,255,0.1) 0%,transparent 50%),radial-gradient(circle at 70% 70%,rgba(5,217,232,0.1) 0%,transparent 50%);animation:var(--sci-fi-glow-animation)}.hero-title{font-family:var(--sci-fi-font-heading);font-size:4rem;font-weight:900;background:linear-gradient(90deg,var(--sci-fi-accent),var(--sci-fi-success),var(--sci-fi-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-size:200% auto;animation:gradient-shift 3s ease infinite;margin-bottom:1rem;text-transform:uppercase;letter-spacing:2px}.hero-subtitle{font-family:var(--sci-fi-font-body);font-size:1.5rem;color:var(--sci-fi-text-secondary);max-width:800px;margin:0 auto 2rem;line-height:1.6}@keyframes gradient-shift{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin:3rem 0}.tool-card{background:var(--sci-fi-card-bg);backdrop-filter:blur(10px);border:1px solid var(--sci-fi-border);border-radius:16px;padding:2rem;transition:all .3s ease;position:relative;overflow:hidden}.tool-card::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(0,212,255,0.05),transparent);transition:left .6s ease}.tool-card:hover::before{left:100%}.tool-card:hover{transform:translate

/* 下拉菜单层叠紧急修复 */
.dropdown-menu {
    z-index: 1001 !important;
}

.nav-dropdown {
    z-index: 1000 !important;
}

/* 确保没有元素覆盖下拉菜单 */
* {
    box-sizing: border-box;
}

body {
    overflow-x: hidden;
}

/* 修复可能的下拉菜单遮挡 */
.tools-container, .page-container, .hero-section {
    position: relative;
    z-index: 1; /* 低于下拉菜单 */
}