.header{z-index:50;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);background:linear-gradient(135deg,#0b1326f2 0%,#0f172ae6 100%);border-radius:100px;align-items:center;max-width:calc(100% - 2rem);padding:0;transition:all .4s cubic-bezier(.4,0,.2,1);display:flex;position:fixed;top:1rem;left:50%;transform:translate(-50%);box-shadow:0 8px 32px #0006}.header-scrolled{-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-color:var(--border-color);background:linear-gradient(135deg,#0b1326fa 0%,#0f172af2 100%);border-radius:100px;box-shadow:0 8px 32px #00000080}body.light-theme .header{background:linear-gradient(135deg,#fffffff2 0%,#f7fafce6 100%);box-shadow:0 8px 32px #0000001a}body.light-theme .header-scrolled{background:linear-gradient(135deg,#fffffffa 0%,#f7fafcf2 100%);box-shadow:0 8px 32px #00000026}.logo{flex-shrink:0;align-items:center;gap:.5rem;padding:.5rem 1rem;text-decoration:none;transition:all .3s;animation:.6s ease-out fadeInDown;display:flex}.header-scrolled .logo{padding:.5rem 1rem}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.header-content{flex:1;justify-content:space-between;align-items:center;gap:2rem;width:100%;max-width:1200px;margin:0 auto;padding:.75rem 1.5rem;display:flex}@media (min-width:768px){.header-content{padding:.75rem 2rem}}.header-nav{flex:1;justify-content:center;gap:.25rem;display:none}@media (min-width:900px){.header-nav{display:flex}}.header-actions{align-items:center;gap:.75rem;margin-left:auto;display:flex}.logo-icon{width:24px;height:24px;color:var(--accent)}.logo-text{color:var(--accent);letter-spacing:-.01em;font-size:22px;font-weight:700}.desktop-nav{gap:.25rem;display:none}@media (min-width:900px){.desktop-nav{display:flex}}.nav-link{color:var(--text-secondary);letter-spacing:.02em;white-space:nowrap;border-radius:.5rem;padding:.625rem 1.25rem;font-size:13px;font-weight:600;text-decoration:none;transition:all .3s;animation:.6s ease-out backwards fadeIn;position:relative}.nav-link:first-child{animation-delay:.1s}.nav-link:nth-child(2){animation-delay:.2s}.nav-link:nth-child(3){animation-delay:.3s}.nav-link:hover{color:var(--accent);background-color:#adc6ff14;transform:translateY(-2px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.nav-link:after{content:"";background-color:var(--accent);border-radius:1px;width:24px;height:2px;transition:transform .3s;position:absolute;bottom:2px;left:50%;transform:translate(-50%)scaleX(0)}.nav-link:hover:after{transform:translate(-50%)scaleX(1)}.header-actions{flex-shrink:0;align-items:center;gap:.75rem;display:flex}.theme-toggle{border:1px solid var(--border-color);width:42px;height:42px;color:var(--accent);cursor:pointer;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#0f172acc;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;transition:all .3s;display:flex}.theme-toggle:hover{border-color:var(--accent);background:#adc6ff26;transform:translateY(-2px);box-shadow:0 4px 12px #adc6ff33}body.light-theme .theme-toggle{background:#0000000d}body.light-theme .theme-toggle:hover{background:#0000001a;box-shadow:0 4px 12px #0000001a}.theme-toggle svg{width:20px;height:20px}.btn{cursor:pointer;letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;border:none;border-radius:999px;padding:.75rem 1.5rem;font-size:11px;font-weight:700;transition:all .3s;animation:.6s ease-out .4s backwards fadeIn;box-shadow:0 10px 25px #0000002e}.btn-primary{background:linear-gradient(135deg, var(--accent) 0%, #8fb0ff 100%);color:#00285d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px #adc6ff40}body.light-theme .btn-primary{color:#fff;background:linear-gradient(135deg,#2563eb 0%,#3b82f6 100%)}body.light-theme .btn-primary:hover{box-shadow:0 14px 30px #2563eb4d}.btn-secondary{color:#dae2fd;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background-color:#0f172ab3;border:1px solid #adc6ff33}.btn-secondary:hover{background-color:#2d3449b3;transform:translateY(-2px)}.btn-large{padding:1rem 2rem;font-size:14px}.mobile-menu-btn,.hamburger-line{display:none}