:root{--primary-color: #2c3e50;--secondary-color: #34495e;--accent-color: #e74c3c;--background-color: #ecf0f1;--text-color: #2c3e50;--card-bg: #ffffff}body{margin:0;font-family:Inter,sans-serif;background-color:var(--background-color);color:var(--text-color)}.container{max-width:1200px;margin:0 auto;padding:20px}button{cursor:pointer;padding:10px 20px;border:none;border-radius:5px;background-color:var(--primary-color);color:#fff;font-size:1rem;transition:background-color .3s}button:hover{background-color:var(--secondary-color)}input,textarea{padding:10px;border:1px solid #bdc3c7;border-radius:5px;font-size:1rem;width:100%;box-sizing:border-box}.card{background:var(--card-bg);border-radius:8px;box-shadow:0 2px 5px #0000001a;padding:20px;margin-bottom:20px}.app-header{background-color:#fff;box-shadow:0 2px 4px #0000001a;padding:1rem 0;margin-bottom:2rem}.header-content{display:flex;justify-content:space-between;align-items:center}.header-content h1 a{text-decoration:none;color:var(--primary-color);font-weight:700}.header-content nav{display:flex;gap:20px}.header-content nav a{text-decoration:none;color:var(--secondary-color);font-weight:500}.header-content nav a:hover{color:var(--accent-color)}