* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0b1120 0%, #0f172a 50%, #1e293b 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: #151d2e;
    border-radius: 16px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    border: 1px solid #334155;
}

.login-header {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    padding: 40px 30px;
    text-align: center;
    color: white;
}

.login-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}

.login-header p {
    opacity: 0.9;
    font-size: 14px;
}

.login-form {
    padding: 40px 30px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #94a3b8;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #334155;
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: #1e293b;
    color: #e2e8f0;
}

.form-group input::placeholder {
    color: #64748b;
}

.form-group input:focus {
    outline: none;
    border-color: #6366f1;
    background: #1e293b;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.btn {
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    color: #f87171;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-top: 16px;
    border-left: 4px solid #ef4444;
}

.login-footer {
    padding: 20px 30px;
    background: #0f172a;
    text-align: center;
    border-top: 1px solid #334155;
}

.login-footer p {
    color: #94a3b8;
    font-size: 13px;
}

@media (max-width: 480px) {
    .login-container {
        padding: 10px;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .login-form {
        padding: 30px 20px;
    }
}