body {
            font-family: 'Instrument Sans', sans-serif;
            background: linear-gradient(135deg, rgba(10, 15, 26, 0.9), rgba(10, 15, 26, 0.7)), url('/images/candlestick-bg.jpg') no-repeat center center fixed;
            background-size: cover;
            background-blend-mode: overlay;
            color: #e2e8f0;
            margin: 0;
            min-height: 100vh;
            overflow-x: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .container {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 1rem;
        }
        .card {
            background: rgba(30, 41, 59, 0.9);
            border-radius: 1rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            padding: 2rem;
            width: 100%;
            max-width: 400px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 30px rgba(0, 0, 0, 0.3), 0 8px 12px rgba(0, 0, 0, 0.15);
        }
        .title {
            font-size: 2.25rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 1.5rem;
            color: #04c22d;
            text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
            letter-spacing: 0.025em;
        }
        .status-message {
            text-align: center;
            margin-bottom: 1rem;
            padding: 0.75rem;
            border-radius: 0.5rem;
            background-color: rgba(16, 185, 129, 0.1);
            color: #04c22d;
            font-size: 0.9rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            font-size: 0.9rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
            color: #a1b0c8;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .form-group input {
            width: 100%;
            padding: 0.875rem 1rem;
            background: #2d3748;
            border: 1px solid #4b5563;
            border-radius: 0.5rem;
            color: #e2e8f0;
            font-size: 1rem;
            transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
        }
        .form-group input:focus {
            border-color: #04c22d;
            box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
            background: #334155;
            outline: none;
        }
        .error-message {
            color: #f87171;
            font-size: 0.8rem;
            margin-top: 0.5rem;
            font-weight: 400;
        }
        .submit-btn {
            width: 100%;
            padding: 0.875rem;
            background: #04c22d;
            color: #1e293b;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            border-radius: 0.5rem;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            letter-spacing: 0.025em;
        }
        .submit-btn:hover {
            background-color: #059669;
            transform: translateY(-3px);
            box-shadow: 0 8px 16px rgba(5, 150, 105, 0.3);
        }
        .login-link {
            text-align: center;
            margin-top: 1.75rem;
            font-size: 0.9rem;
            color: #a1b0c8;
        }
        .login-link a {
            color: #04c22d;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }
        .login-link a:hover {
            color: #059669;
            text-decoration: underline;
        }
        /* Tablet (641px - 1023px) */
        @media (max-width: 1023px) and (min-width: 641px) {
            .container {
                padding: 1rem;
                max-width: 380px;
            }
            .card {
                padding: 2rem;
            }
            .title {
                font-size: 2rem;
            }
            .status-message {
                font-size: 0.85rem;
            }
            .form-group input {
                padding: 0.75rem 1rem;
                font-size: 0.95rem;
            }
            .error-message {
                font-size: 0.75rem;
            }
            .submit-btn {
                padding: 0.75rem;
                font-size: 0.95rem;
            }
            .login-link {
                font-size: 0.85rem;
                margin-top: 1.5rem;
            }
        }
        /* Mobile (≤640px) */
        @media (max-width: 640px) {
            .container {
                padding: 1rem;
            }
            .card {
                padding: 1.5rem;
                border-radius: 1rem;
            }
            .title {
                font-size: 1.75rem;
                margin-bottom: 1.25rem;
            }
            .status-message {
                padding: 0.5rem;
                font-size: 0.8rem;
            }
            .form-group {
                margin-bottom: 1.25rem;
            }
            .form-group label {
                font-size: 0.85rem;
                margin-bottom: 0.4rem;
            }
            .form-group input {
                padding: 0.75rem 1rem;
                font-size: 0.9rem;
            }
            .error-message {
                font-size: 0.7rem;
                margin-top: 0.2rem;
            }
            .submit-btn {
                padding: 0.75rem;
                font-size: 0.9rem;
            }
            .login-link {
                font-size: 0.8rem;
                margin-top: 1.25rem;
            }
        }