:root { --primary: #1e3a8a; --primary-hover: #1d4ed8; --bg: #f8fafc; --card-bg: #ffffff; --text: #1e293b; --border: #cbd5e1; }
        * { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, sans-serif; }
        body { background-color: var(--bg); color: var(--text); padding: 40px 20px; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; }
        .container { max-width: 450px; width: 100%; background: var(--card-bg); padding: 35px; border-radius: 12px; box-shadow: 0 4px 20px rgba(0,0,0,0.08); text-align: center; }
        h1 { font-size: 1.6rem; color: var(--primary); margin-bottom: 25px; }
        .form-group { text-align: left; margin-bottom: 20px; }
        .form-label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.9rem; }
        .form-control { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 1.1rem; text-align: center; }
        .btn { display: block; width: 100%; padding: 12px; background-color: var(--primary); color: white; border: none; border-radius: 6px; font-size: 0.95rem; font-weight: 600; cursor: pointer; text-decoration: none; }
        .btn:hover { background-color: var(--primary-hover); }
        .btn-alt { background-color: transparent; color: #64748b; border: 1px solid var(--border); margin-top: 12px; }
        .btn-alt:hover { background-color: #f1f5f9; }
        .overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(15, 23, 42, 0.7); z-index: 1000; justify-content: center; align-items: center; color: white; }
        .spinner { width: 35px; height: 35px; border: 4px solid rgba(255, 255, 255, 0.3); border-radius: 50%; border-top-color: white; animation: spin 1s linear infinite; margin-bottom: 10px; }
        @keyframes spin { to { transform: rotate(360deg); } }
        .footer-counter { margin-top: 30px; }
        .footer-counter img { width: 80px; height: auto; }