.header{background-color:var(--bg-white);border-bottom:1px solid var(--border-color);padding:0;box-shadow:var(--shadow-sm)}.header-container{max-width:1400px;margin:0 auto;padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:70px}.header-logo{display:flex;align-items:center}.header-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin:0}.header-nav{display:flex;align-items:center;gap:2rem;flex:1;justify-content:center}.nav-link{background:transparent;border:none;color:var(--text-primary);font-size:.95rem;font-weight:500;padding:.5rem 0;cursor:pointer;transition:color .2s ease;position:relative}.nav-link:hover,.nav-link.active{color:var(--primary-blue)}.nav-link.active:after{content:"";position:absolute;bottom:-23px;left:0;right:0;height:3px;background-color:var(--primary-blue)}.header-actions{display:flex;align-items:center;gap:1rem}.btn-login{background:transparent;border:none;color:var(--text-primary);font-size:.95rem;font-weight:500;padding:.5rem 1rem;cursor:pointer;transition:color .2s ease}.btn-login:hover{color:var(--primary-blue)}.btn-contact{background-color:var(--primary-blue-dark);color:#fff;border:none;border-radius:25px;padding:.6rem 1.5rem;font-size:.95rem;font-weight:500;cursor:pointer;transition:background-color .2s ease}.btn-contact:hover{background-color:var(--primary-blue)}.theme-toggle{background:var(--bg-light);border:2px solid var(--border-color);border-radius:20px;padding:.5rem .75rem;font-size:1.1rem;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;min-width:45px;height:38px}.theme-toggle:hover{transform:scale(1.05);border-color:var(--primary-blue);background:var(--bg-container)}:root{--primary-blue: #0066cc;--primary-blue-hover: #0052a3;--primary-blue-dark: #003d7a;--accent-blue: #1e88e5;--bg-light: #f8fafc;--bg-container: #ffffff;--bg-white: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--text-muted: #94a3b8;--border-color: #e2e8f0;--border-radius: 8px;--border-radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .1);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--transition: all .3s ease;--error-bg: rgba(239, 68, 68, .1);--error-color: #dc2626;--success-color: #10b981}[data-theme=dark]{--primary-blue: #3b82f6;--primary-blue-hover: #2563eb;--primary-blue-dark: #1d4ed8;--accent-blue: #60a5fa;--bg-light: #0f172a;--bg-container: #1e293b;--bg-white: #1e293b;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--border-color: #334155;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .5);--shadow-md: 0 4px 12px rgba(0, 0, 0, .6);--error-bg: rgba(239, 68, 68, .15);--error-color: #f87171;--success-color: #34d399}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-light);color:var(--text-primary)}button{font-family:inherit;cursor:pointer;border:none;outline:none}a{text-decoration:none;color:inherit}.app{min-height:100vh;background-color:var(--bg-light);transition:background-color .3s ease}.main-content{padding:2rem 0}.loading-spinner{display:flex;justify-content:center;align-items:center;height:200px;font-size:1.2rem;color:var(--text-secondary)}